Search

Timber-framed shear walls are designed to resist the lateral loads on a building from wind and earthquake. Many regions around the world have developed standard test methods for evaluating the performance of timber-framed shear walls. Currently, Australia has no such standard test method for timber-framed shear walls. The aim of this study is to develop a standard loading protocol for evaluating the performance of timber-framed shear walls in Australia that is informed by the concerns of both earthquake engineers and wind engineers. To achieve this aim, the key objective of this study is to compare the performance of a standard timber-framed shear wall under three different monotonic (groups M1, M2 and M3) and four different cyclic (groups C1, C2, C3 and C4) loading protocols according to their respective standards. The number of test panels in each group was three (3) for a total number of 21 individual tests. Structural performance characteristics of the standard test panel, such as ultimate and yield strength and global stiffness, were found to be strongly dependent on the loading protocol. For example, ultimate strength was lower for test panels subject to monotonic loading (i.e., 5.99, 6.41 and 6.34kN/m for groups M1, M2 and M3 respectively) compared to test panels subject to cyclic loading (i.e., 6.70, 6.73, 8.03 and 8.11kN/m for groups C1, C2, C3 and C4 respectively). Internal stiffness was found to be relatively consistent regardless of loading protocol. The higher ultimate and yield performance of group C3 (CUREE protocol) and C4 (Cyclone Testing Station protocol) is statistically significant, at the 5% significance level, compared to results from all other test methods (i.e., AS1720.1, EN 594, ASTM E564, BRANZ P21 and ISO 16670). Differences in boundary conditions between the loading protocols might explain some of the differences in results; however, this hypothesis is not strongly supported by the evidence. These results are used to inform our recommenda

Modern volume carriers such as container vessels, cruise ships and Pure Car and Truck Carriers (PCTC’s) have become more vulnerable to critical roll responses as built in margins have been traded against increased transport efficiency. The research presented in this doctoral thesis aims at enhancing the predictability and control of these critical roll responses. The thesis presents a holistic framework for predicting and assessing the roll damping, which is a crucial parameter for predicting roll motions, based on a unique combination of full scale trials, model tests, semi-empirical methods and computational fluid dynamics. The framework is intended to be used from the early design stage and gradually improved until delivery of the ship and finally to provide input for decision support in the operation. The thesis also includes a demonstration of a new application for rudder control to be used for mitigation of parametric roll. This is performed by simulating real incidents that have occurred with PCTC’s in service. Simulations with rudder roll control show promising results and reveal that the approach could be very efficient for mitigation of parametric roll. Finally, an approach for monitoring of roll induced stresses, so-called racking stresses in PCTC’s, is presented. The approach involves measurement of the ship motions and scaling of pre-calculated structural responses from global finite element analysis. Based on full scale motion and stress measurements from a PCTC in-service the approach is evaluated and demonstrated to be an efficient alternative to conventional methods., QC 20170516

Modern volume carriers such as container vessels, cruise ships and Pure Car and Truck Carriers (PCTC’s) have become more vulnerable to critical roll responses as built in margins have been traded against increased transport efficiency. The research presented in this doctoral thesis aims at enhancing the predictability and control of these critical roll responses. The thesis presents a holistic framework for predicting and assessing the roll damping, which is a crucial parameter for predicting roll motions, based on a unique combination of full scale trials, model tests, semi-empirical methods and computational fluid dynamics. The framework is intended to be used from the early design stage and gradually improved until delivery of the ship and finally to provide input for decision support in the operation. The thesis also includes a demonstration of a new application for rudder control to be used for mitigation of parametric roll. This is performed by simulating real incidents that have occurred with PCTC’s in service. Simulations with rudder roll control show promising results and reveal that the approach could be very efficient for mitigation of parametric roll. Finally, an approach for monitoring of roll induced stresses, so-called racking stresses in PCTC’s, is presented. The approach involves measurement of the ship motions and scaling of pre-calculated structural responses from global finite element analysis. Based on full scale motion and stress measurements from a PCTC in-service the approach is evaluated and demonstrated to be an efficient alternative to conventional methods., QC 20170516

Modern volume carriers such as container vessels, cruise ships and Pure Car and Truck Carriers (PCTC’s) have become more vulnerable to critical roll responses as built in margins have been traded against increased transport efficiency. The research presented in this doctoral thesis aims at enhancing the predictability and control of these critical roll responses. The thesis presents a holistic framework for predicting and assessing the roll damping, which is a crucial parameter for predicting roll motions, based on a unique combination of full scale trials, model tests, semi-empirical methods and computational fluid dynamics. The framework is intended to be used from the early design stage and gradually improved until delivery of the ship and finally to provide input for decision support in the operation. The thesis also includes a demonstration of a new application for rudder control to be used for mitigation of parametric roll. This is performed by simulating real incidents that have occurred with PCTC’s in service. Simulations with rudder roll control show promising results and reveal that the approach could be very efficient for mitigation of parametric roll. Finally, an approach for monitoring of roll induced stresses, so-called racking stresses in PCTC’s, is presented. The approach involves measurement of the ship motions and scaling of pre-calculated structural responses from global finite element analysis. Based on full scale motion and stress measurements from a PCTC in-service the approach is evaluated and demonstrated to be an efficient alternative to conventional methods., QC 20170516

Modern volume carriers such as container vessels, cruise ships and Pure Car and Truck Carriers (PCTC’s) have become more vulnerable to critical roll responses as built in margins have been traded against increased transport efficiency. The research presented in this doctoral thesis aims at enhancing the predictability and control of these critical roll responses. The thesis presents a holistic framework for predicting and assessing the roll damping, which is a crucial parameter for predicting roll motions, based on a unique combination of full scale trials, model tests, semi-empirical methods and computational fluid dynamics. The framework is intended to be used from the early design stage and gradually improved until delivery of the ship and finally to provide input for decision support in the operation. The thesis also includes a demonstration of a new application for rudder control to be used for mitigation of parametric roll. This is performed by simulating real incidents that have occurred with PCTC’s in service. Simulations with rudder roll control show promising results and reveal that the approach could be very efficient for mitigation of parametric roll. Finally, an approach for monitoring of roll induced stresses, so-called racking stresses in PCTC’s, is presented. The approach involves measurement of the ship motions and scaling of pre-calculated structural responses from global finite element analysis. Based on full scale motion and stress measurements from a PCTC in-service the approach is evaluated and demonstrated to be an efficient alternative to conventional methods., QC 20170516

Modern volume carriers such as container vessels, cruise ships and Pure Car and Truck Carriers (PCTC’s) have become more vulnerable to critical roll responses as built in margins have been traded against increased transport efficiency. The research presented in this doctoral thesis aims at enhancing the predictability and control of these critical roll responses. The thesis presents a holistic framework for predicting and assessing the roll damping, which is a crucial parameter for predicting roll motions, based on a unique combination of full scale trials, model tests, semi-empirical methods and computational fluid dynamics. The framework is intended to be used from the early design stage and gradually improved until delivery of the ship and finally to provide input for decision support in the operation. The thesis also includes a demonstration of a new application for rudder control to be used for mitigation of parametric roll. This is performed by simulating real incidents that have occurred with PCTC’s in service. Simulations with rudder roll control show promising results and reveal that the approach could be very efficient for mitigation of parametric roll. Finally, an approach for monitoring of roll induced stresses, so-called racking stresses in PCTC’s, is presented. The approach involves measurement of the ship motions and scaling of pre-calculated structural responses from global finite element analysis. Based on full scale motion and stress measurements from a PCTC in-service the approach is evaluated and demonstrated to be an efficient alternative to conventional methods., QC 20170516

The assignment, which has been carried out on behalf of Troax AB was to develop suggestions on one sided fasteners that will be used to attach the anti-collapse system for pallet racks. The problem, as it is today, is that the installers of the mesh panels for the anti-collapse system find it difficult to reach behind and inside the pallet racking beam when they screw together the screw and the nut to hold up the anti-collapse system. Therefore, there is a desire to use a fastener which does not have to handle screws or bolts on the back of the beam. One design requirements is that it should fit most hole patterns and hole sizes available for pallet racks today. It also has the requirement that it must hold for a pendulum test. The energy is then converted into a force for easier calculations. When a safety factor is applied the force that the system is subjected to is approximately 10KN. SolidWorks was used to model and structurally analyze the various design proposals. The best design proposal was put into a simulations study to be analyzed. Then the proposal was compared with the screw which is currently in use. The results of the structural analysis of the current screw show that it withstands the applied loads. The proposed suggestion lacks credibility due to the fact that the stresses shown in the simulations are too high. Based on the results from the structural analysis, it is concluded that further studies are needed and also that the other design suggestions should be examined further in case they could be improved to make them meet the requirements., Detta arbete är utfört på uppdrag av Troax AB där uppgiften var att ta fram förslag på ensidesfästade fästelement som ska användas till att fästa rasskydd till pallstallage. Problemet som det är idag är att montörerna av rasskyddet anser att det är svårt att komma åt bakom och innanför balken då man ska skruva dit skruv och mutter för att hålla upp rasskyddet. Därför finns det en önskan att kunna använda ett fästelement där man inte behöver hantera skruvar eller muttrar på baksidan av balken. Kravet som sattes på fästelementet är att den ska passa till de flesta hålbilder och hålstorlekar som finns på stallagebalkar idag. Den ska även hålla för ett pendeltest då en pendel med vikten 160kg och rörelseenergin 2500J slås in i ett gallernät. Energin räknas sedan om till en kraft för enklare beräkning och för att kunna föra in kraften i datorsimuleringar. Kraften som systemet utsätts för blir enligt uträkning ca 7100N och med en säkerhetsfaktor blir den resulterande kraften 10000N. SolidWorks används för modellering samt för analys av designförslagen. Först sätts hela systemet med alla balkar, konsoler, paneler och skruvar upp i SolidWorks och Simulation för att se hur allt hänger ihop. Därefter förenklas uppsättningen och ger resultatet att skruven utsätts för dragkraft och skjuvkraft där hela kraften appliceras. Det designförslag som bäst uppfyllde kraven sattes in i Simulation för att studeras. Där undersöks och jämförs förslaget med dagens skruv där båda utsätts för både dragkraft och skjuvkraft. Dagens skruv visar resultatet att den håller för de uppsatta krafterna. Förslagets resultat vid drag är dock opålitliga då uppsättningen av denna inte är optimal. Utifrån resultatet dras slutsatsen att det krävs ytterligare studier på förslaget och att man även bör titta på de övriga förslagen som togs fram för att se om det finns eventuella förbättringar på dessa som gör att de uppfyller kraven.

The assignment, which has been carried out on behalf of Troax AB was to develop suggestions on one sided fasteners that will be used to attach the anti-collapse system for pallet racks. The problem, as it is today, is that the installers of the mesh panels for the anti-collapse system find it difficult to reach behind and inside the pallet racking beam when they screw together the screw and the nut to hold up the anti-collapse system. Therefore, there is a desire to use a fastener which does not have to handle screws or bolts on the back of the beam. One design requirements is that it should fit most hole patterns and hole sizes available for pallet racks today. It also has the requirement that it must hold for a pendulum test. The energy is then converted into a force for easier calculations. When a safety factor is applied the force that the system is subjected to is approximately 10KN. SolidWorks was used to model and structurally analyze the various design proposals. The best design proposal was put into a simulations study to be analyzed. Then the proposal was compared with the screw which is currently in use. The results of the structural analysis of the current screw show that it withstands the applied loads. The proposed suggestion lacks credibility due to the fact that the stresses shown in the simulations are too high. Based on the results from the structural analysis, it is concluded that further studies are needed and also that the other design suggestions should be examined further in case they could be improved to make them meet the requirements., Detta arbete är utfört på uppdrag av Troax AB där uppgiften var att ta fram förslag på ensidesfästade fästelement som ska användas till att fästa rasskydd till pallstallage. Problemet som det är idag är att montörerna av rasskyddet anser att det är svårt att komma åt bakom och innanför balken då man ska skruva dit skruv och mutter för att hålla upp rasskyddet. Därför finns det en önskan att kunna använda ett fästelement där man inte behöver hantera skruvar eller muttrar på baksidan av balken. Kravet som sattes på fästelementet är att den ska passa till de flesta hålbilder och hålstorlekar som finns på stallagebalkar idag. Den ska även hålla för ett pendeltest då en pendel med vikten 160kg och rörelseenergin 2500J slås in i ett gallernät. Energin räknas sedan om till en kraft för enklare beräkning och för att kunna föra in kraften i datorsimuleringar. Kraften som systemet utsätts för blir enligt uträkning ca 7100N och med en säkerhetsfaktor blir den resulterande kraften 10000N. SolidWorks används för modellering samt för analys av designförslagen. Först sätts hela systemet med alla balkar, konsoler, paneler och skruvar upp i SolidWorks och Simulation för att se hur allt hänger ihop. Därefter förenklas uppsättningen och ger resultatet att skruven utsätts för dragkraft och skjuvkraft där hela kraften appliceras. Det designförslag som bäst uppfyllde kraven sattes in i Simulation för att studeras. Där undersöks och jämförs förslaget med dagens skruv där båda utsätts för både dragkraft och skjuvkraft. Dagens skruv visar resultatet att den håller för de uppsatta krafterna. Förslagets resultat vid drag är dock opålitliga då uppsättningen av denna inte är optimal. Utifrån resultatet dras slutsatsen att det krävs ytterligare studier på förslaget och att man även bör titta på de övriga förslagen som togs fram för att se om det finns eventuella förbättringar på dessa som gör att de uppfyller kraven.

Práce se zabývá problematikou skladové logistiky ve společnosti Kiekert - CS s.r.o. Teoretická část práce je zaměřena na charakteristiku skladové logistiky a její zanalyzování ve vybraném podniku. Praktická část práce se věnuje možným návrhům skladových systémů pro zefektivnění skladových procesů. V závěru práce je nejvhodnější varianta ekonomicky zhodnocena., The work deals with the issue of warehouse logistics in Kiekert - CS s.r.o. company. The theoretical part is focusing on the characteristics of the warehouse logistics and analyzing of selected company. The practical part describes possible proposals of the storage systems improving efficiency of warehouse proccesses. In the end the best choice economically evaluated., Katedra dopravního managementu, marketingu a logistiky, Diplomantka přednesla ucelenou a logicky uspořádanou obhajobu svého diplomového projektu. V ní dokázala přesvědčivým způsobem obhájit závěry svých řešení. Na připomínky oponenta reagovala správně a v plném rozsahu je zodpověděla. U doplňkových otázek prokázala schopnost logického myšlení, pohotové reakce, jasného a srozumitelného vysvětlení.

Modern Panamax Pure Car and Truck Carriers (PCTC) have become more vulnerable to critical roll responses as built in margins have been traded against increased transport efficiency. The research presented in this licentiate thesis aims at enhancing the predictability and control of these critical roll responses. The thesis presents the development of a new method for assessing the roll damping, which is a crucial parameter for predicting roll motions. The method involves a unique set up of full scale in-service trials and is straightforward, cost efficient and shows a good potential. The thesis also includes a demonstration of a new application for rudder control to be used for mitigation of parametric roll. This is performed by simulating real incidents that have occurred with PCTC’s in service. Simulations with rudder roll control show promising results and reveal that the approach could be very efficient for mitigation of parametric roll. Last but not least an approach for monitoring of roll induced stresses, so-called racking stresses in PCTC’s, is presented. The approach involves measurement of the ship motions and scaling of pre-calculated structural responses from global finite element analysis. Based on full scale motion and stress measurements from a PCTC in-service the approach is evaluated and demonstrated to be an efficient alternative to conventional methods., QC 20130424

Modern Panamax Pure Car and Truck Carriers (PCTC) have become more vulnerable to critical roll responses as built in margins have been traded against increased transport efficiency. The research presented in this licentiate thesis aims at enhancing the predictability and control of these critical roll responses. The thesis presents the development of a new method for assessing the roll damping, which is a crucial parameter for predicting roll motions. The method involves a unique set up of full scale in-service trials and is straightforward, cost efficient and shows a good potential. The thesis also includes a demonstration of a new application for rudder control to be used for mitigation of parametric roll. This is performed by simulating real incidents that have occurred with PCTC’s in service. Simulations with rudder roll control show promising results and reveal that the approach could be very efficient for mitigation of parametric roll. Last but not least an approach for monitoring of roll induced stresses, so-called racking stresses in PCTC’s, is presented. The approach involves measurement of the ship motions and scaling of pre-calculated structural responses from global finite element analysis. Based on full scale motion and stress measurements from a PCTC in-service the approach is evaluated and demonstrated to be an efficient alternative to conventional methods., QC 20130424

Modern Panamax Pure Car and Truck Carriers (PCTC) have become more vulnerable to critical roll responses as built in margins have been traded against increased transport efficiency. The research presented in this licentiate thesis aims at enhancing the predictability and control of these critical roll responses. The thesis presents the development of a new method for assessing the roll damping, which is a crucial parameter for predicting roll motions. The method involves a unique set up of full scale in-service trials and is straightforward, cost efficient and shows a good potential. The thesis also includes a demonstration of a new application for rudder control to be used for mitigation of parametric roll. This is performed by simulating real incidents that have occurred with PCTC’s in service. Simulations with rudder roll control show promising results and reveal that the approach could be very efficient for mitigation of parametric roll. Last but not least an approach for monitoring of roll induced stresses, so-called racking stresses in PCTC’s, is presented. The approach involves measurement of the ship motions and scaling of pre-calculated structural responses from global finite element analysis. Based on full scale motion and stress measurements from a PCTC in-service the approach is evaluated and demonstrated to be an efficient alternative to conventional methods., QC 20130424

Modern Panamax Pure Car and Truck Carriers (PCTC) have become more vulnerable to critical roll responses as built in margins have been traded against increased transport efficiency. The research presented in this licentiate thesis aims at enhancing the predictability and control of these critical roll responses. The thesis presents the development of a new method for assessing the roll damping, which is a crucial parameter for predicting roll motions. The method involves a unique set up of full scale in-service trials and is straightforward, cost efficient and shows a good potential. The thesis also includes a demonstration of a new application for rudder control to be used for mitigation of parametric roll. This is performed by simulating real incidents that have occurred with PCTC’s in service. Simulations with rudder roll control show promising results and reveal that the approach could be very efficient for mitigation of parametric roll. Last but not least an approach for monitoring of roll induced stresses, so-called racking stresses in PCTC’s, is presented. The approach involves measurement of the ship motions and scaling of pre-calculated structural responses from global finite element analysis. Based on full scale motion and stress measurements from a PCTC in-service the approach is evaluated and demonstrated to be an efficient alternative to conventional methods., QC 20130424

Modern Panamax Pure Car and Truck Carriers (PCTC) have become more vulnerable to critical roll responses as built in margins have been traded against increased transport efficiency. The research presented in this licentiate thesis aims at enhancing the predictability and control of these critical roll responses. The thesis presents the development of a new method for assessing the roll damping, which is a crucial parameter for predicting roll motions. The method involves a unique set up of full scale in-service trials and is straightforward, cost efficient and shows a good potential. The thesis also includes a demonstration of a new application for rudder control to be used for mitigation of parametric roll. This is performed by simulating real incidents that have occurred with PCTC’s in service. Simulations with rudder roll control show promising results and reveal that the approach could be very efficient for mitigation of parametric roll. Last but not least an approach for monitoring of roll induced stresses, so-called racking stresses in PCTC’s, is presented. The approach involves measurement of the ship motions and scaling of pre-calculated structural responses from global finite element analysis. Based on full scale motion and stress measurements from a PCTC in-service the approach is evaluated and demonstrated to be an efficient alternative to conventional methods., QC 20130424

Modern Panamax Pure Car and Truck Carriers (PCTC) have become more vulnerable to critical roll responses as built in margins have been traded against increased transport efficiency. The research presented in this licentiate thesis aims at enhancing the predictability and control of these critical roll responses. The thesis presents the development of a new method for assessing the roll damping, which is a crucial parameter for predicting roll motions. The method involves a unique set up of full scale in-service trials and is straightforward, cost efficient and shows a good potential. The thesis also includes a demonstration of a new application for rudder control to be used for mitigation of parametric roll. This is performed by simulating real incidents that have occurred with PCTC’s in service. Simulations with rudder roll control show promising results and reveal that the approach could be very efficient for mitigation of parametric roll. Last but not least an approach for monitoring of roll induced stresses, so-called racking stresses in PCTC’s, is presented. The approach involves measurement of the ship motions and scaling of pre-calculated structural responses from global finite element analysis. Based on full scale motion and stress measurements from a PCTC in-service the approach is evaluated and demonstrated to be an efficient alternative to conventional methods., QC 20130424

Today, timber structures are receiving attention more and more. Because of the increasing interest in sustainable construction as well as for other reasons, building industry in Europe is (re)-discovering multi-storey timber structures for construction of mid-rise buildings. In this master’s thesis, an analytical calculation method and modelling approach are presented, to calculate the timber-frame shear-wall racking stiffness. With the research, a specific gap in engineers knowledge is completed, and a contribution is made to the development of multi-storey timber-frame structures in the Dutch context of building engineering., Structural and Building Engineering, Structural Engineering, Civil Engineering and Geosciences

This paper presents a method for monitoring of racking-induced stresses in ro-ro ships. The approach is built on the assumption that the racking stresses are mainly induced by the roll and sway motions and therewith related inertia and gravity forces. The approach involves real-time measurement of the ship motions and scaling of the measured motions with pre-calculated structural responses from finite element analysis. The method is applied to full-scale measurement data from the Wallenius Lines PCTC Mignon. Derived stresses show good agreement with stresses derived from strain gauge measurements, indicating that the method has potential as an alternative to conventional strain-gauge-based monitoring. Motion-based stress monitoring has several potential areas of application such as providing data for decision support, for live assistance and short-term route planning, structural condition reports and for supplying feedback to the design process., QC 20120202. Available online: 07 Jul 2011

Today, timber structures are receiving attention more and more. Because of the increasing interest in sustainable construction as well as for other reasons, building industry in Europe is (re)-discovering multi-storey timber structures for construction of mid-rise buildings. In this master’s thesis, an analytical calculation method and modelling approach are presented, to calculate the timber-frame shear-wall racking stiffness. With the research, a specific gap in engineers knowledge is completed, and a contribution is made to the development of multi-storey timber-frame structures in the Dutch context of building engineering., Structural and Building Engineering, Structural Engineering, Civil Engineering and Geosciences