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49 results on '"Piloto, Paulo A. G."'

3. Estimating the Temperature on the Reinforcing Bars of Composite Slabs Under Fire Conditions

Author

Balsa, Carlos, Piloto, Paulo A. G., Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Marreiros, Goreti, editor, Martins, Bruno, editor, Paiva, Ana, editor, Ribeiro, Bernardete, editor, and Sardinha, Alberto, editor

Published
2022
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4. Buckling Resistance of Partially Encased Columns Embedded on Walls Under Fire from One Side

Author

Piloto, Paulo A. G., Gonçales, Nathália, Rigobello, Ronaldo, Vaz, Mário, Guedes, Rui M., Baptista, João S., di Prisco, Marco, Series Editor, Chen, Sheng-Hong, Series Editor, Vayas, Ioannis, Series Editor, Kumar Shukla, Sanjay, Series Editor, Sharma, Anuj, Series Editor, Kumar, Nagesh, Series Editor, Wang, Chien Ming, Series Editor, Piloto, Paulo A. G., editor, Rodrigues, João Paulo, editor, and Silva, Valdir Pignatta, editor

Published
2020
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5. Three-Dimensional Numerical Analysis on the Fire Behaviour of Composite Slabs with Steel Deck

Author

Piloto, Paulo A. G., Balsa, Carlos, Ribeiro, Fernando F., Rigobello, Ronaldo, di Prisco, Marco, Series Editor, Chen, Sheng-Hong, Series Editor, Vayas, Ioannis, Series Editor, Kumar Shukla, Sanjay, Series Editor, Sharma, Anuj, Series Editor, Kumar, Nagesh, Series Editor, Wang, Chien Ming, Series Editor, Piloto, Paulo A. G., editor, Rodrigues, João Paulo, editor, and Silva, Valdir Pignatta, editor

Published
2020
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24. Valorization of Lignin Side-Streams into Polyols and Rigid Polyurethane Foams—A Contribution to the Pulp and Paper Industry Biorefinery

Author

Pinto, João A., primary, Fernandes, Isabel P., additional, Pinto, Virginia D., additional, Gomes, Elson, additional, Oliveira, Cátia F., additional, C. R. Pinto, Paula C. R., additional, Mesquita, Luís M. R., additional, Piloto, Paulo A. G., additional, Rodrigues, Alírio E., additional, and Barreiro, Maria-Filomena, additional

Published
2021
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27. The heat transfer modelling for bone metastatic lesion minimization using two different cement types

Author

Oliveira, Vânia C. C., Fonseca, Elza M M, Belinha, Jorge, Rua, Claúdia, Piloto, Paulo A. G., Renato N., Jorge, and Repositório Científico do Instituto Politécnico do Porto

Subjects
Cement, Materials science, Tumor, Computational model, Heat transfer, Metastatic lesion, Biomedical engineering
Abstract

Bone tumors grow when cells divide without any control, forming a tissue mass. Bone tumors could be benign or malignant, and primary or metastatic due to systemic cancer cells dissemination. They destroy bone and lead to pathological fractures. The main objective of this work is to study the thermal effect induced by the bone cement polymerization, in the bone metastatic tumor minimization. To assess the clinical effect, it is important to test this methodology before its application and obtain sustained results. In this work, a numerical model was developed to predict the temperature distribution produced by cement polymerization. Thus, distinct tests were produced for different two cements types and amounts introduced in a cortical and spongy bone metastatic lesion, with or without an intramedullary titanium nail. The bone cement was introduced to fill in a metastatic lytic lesion area, which the main objective is playing a promising role for bone tumor necrosis due to thermal effects and biomechanical stabilization for function and pain relief. info:eu-repo/semantics/publishedVersion

Published
2020

28. The load-bearing of composite slabs with steel deck under natural fires.

Author

Filho, Marcílio M. A., Piloto, Paulo A. G., and Balsa, Carlos

Subjects
*STEEL, *FIRE prevention, *STRENGTH of materials, *PARAMETRIC modeling
Abstract

Composite slabs with steel deck combine the load-bearing resistance of the steel deck and rebar with the compressive resistance of the concrete (components). Unprotected composite slabs may be exposed to natural fire conditions from below, and steel reduces its load-bearing capacity during the heating stage. In short fire events, with limited deformations, the composite slabs can recover the load-bearing capacity during the cooling stage. This research presents the validation of the numerical model and the development of a parametric study, to evaluate the load-bearing capacity during the fire event. This method includes a time step procedure, based on the average temperature calculation for each component, including the reduction coefficients applied to the design strength of each material. A new proposal is also presented to evaluate the residual loadbearing capacity. In some circumstances, the residual load-bearing can be reduced by more than 20%. The results showed that the highest variation in the load-bearing resistance of composite slabs occurs when the steel temperatures are between 20 and 600°C, after this temperature, the steel has already lost most of its mechanical strength. Moreover, it was observed that different heating rates and different cooling rates influence the rate of the reduction and recovery of the load-bearing capacity. It was also noticed that the lowest load-bearing capacity of the composite slabs was reached after the end of the heating phase, showing that the stability of the element during the heating phase does not guarantee fire safety during the cooling phase. [ABSTRACT FROM AUTHOR]

Published
2022
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30. THREE-DIMENSIONAL NUMERICAL MODELLING OF FIRE EXPOSED COMPOSITE SLABS WITH STEEL DECK

Author

Piloto, Paulo A G, Balsa, Carlos, Ribeiro, Fernando, Santos, Lucas, Rigobello, Ronaldo, Kimura, Erica, Piloto, Paulo A G, Balsa, Carlos, Ribeiro, Fernando, Santos, Lucas, Rigobello, Ronaldo, and Kimura, Erica

Abstract

Composite slabs with reinforced concrete and cold-formed profiled steel deck are very popular and reduce the building construction time. The steel deck acts as a permanent formwork to the concrete topping. Usually, the concrete is reinforced with individual rebars placed within the ribs for positive bending, and a steel mesh on the top for negative bending and to prevent concrete cracking. The fire rating of these building elements involves the analysis of different criteria, namely load bearing (R), integrity (E) and insulation (I). The integrity is easily verified, due to the construction method. The other two metrics require the development of experimental fire tests, the application of simplified calculation methods or the development of advanced calculation models. This investigation introduces 3-D numerical validation models for load bearing (R) and insulation (I) criteria. Parametric analyses are developed to investigate the effect of the load into the fire resistance (R) and critical temperature of the steel components (deck, rebar and mesh), as well as the effect of the concrete thickness on the fire resistance from the insulation standpoint (I). The advanced calculation model consists of a non-linear analysis for the thermal and structural behaviour. Both thermal and mechanical models consider perfect contact between materials. For the thermal model, an alternative model is used, with an air gap included between the steel deck and concrete topping to simulate debonding effects. For the mechanical model, the live load level changes from 1.0 kN/m2 to 21.0 kN/m2, and the dead load presents a constant value of 2.8 kN/m2. The fire resistance is determined according to standards, based on the maximum displacement or the rate of displacement. The critical temperature of each steel component decreases with the load level. A new proposal is presented for the critical temperature of each steel component and for the fire resistance according to the insulation criteri

Published
2019

38. LOADBEARING CAPACITY OF LSF WALLS UNDER FIRE EXPOSURE

Author

Piloto, Paulo A G, Khetata, Mohamed S, Gavilán, Ana B R, Piloto, Paulo A G, Khetata, Mohamed S, and Gavilán, Ana B R

Abstract

Light steel frame (LSF) (LSF) and prefabricated panels are widely used in loadbearing walls, with direct application to steel framed buildings. These walls are made with steel cold formed sections (studs and tracks) using gypsum plasterboard and other material layers attached to the flanges and sometimes insulation material in the cavities. The fire resistance is usually provided by one or more layer of materials and or by the cavity insulation. This investigation evaluates the fire resistance of the loadbearing walls, from the point of view of insulation (I) and loadbearing capacity (R). Experimental results obtained from partition walls were used into the numerical model to accurately preview the cracking, falling off and the ignition of combustible material. The numerical model was validated under the same fire conditions. The loadbearing capacity is determined using this hybrid model. This model is able to predict an accurate fire resistance for any load level, taking into account the brittle behaviour of gypsum panels and the ignition of combustible materials. The loadbearing decreases with the increase of the load level. A new formula is presented to determine the critical average temperature of the LSF.

Published
2018

39. Preface.

Author

Piloto, Paulo A. G., Piloto, Paulo AG, and Morgan, Alexander B

Published
2020
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43. Emergency Exits: Analysis and Reflection Based on a Modelling and Standardization Study

Author

Pinto, Edna Moura, Montenegro, Mariana Lima Oliveira, di Prisco, Marco, Series Editor, Chen, Sheng-Hong, Series Editor, Vayas, Ioannis, Series Editor, Kumar Shukla, Sanjay, Series Editor, Sharma, Anuj, Series Editor, Kumar, Nagesh, Series Editor, Wang, Chien Ming, Series Editor, Piloto, Paulo A. G., editor, Rodrigues, João Paulo, editor, and Silva, Valdir Pignatta, editor

Published
2020
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44. Modelling Real Fire by FDS and 2-Zone Model for Structural Post-Fire Assessment

Author

Molkens, Tom, Rossi, Barbara, di Prisco, Marco, Series Editor, Chen, Sheng-Hong, Series Editor, Vayas, Ioannis, Series Editor, Kumar Shukla, Sanjay, Series Editor, Sharma, Anuj, Series Editor, Kumar, Nagesh, Series Editor, Wang, Chien Ming, Series Editor, Piloto, Paulo A. G., editor, Rodrigues, João Paulo, editor, and Silva, Valdir Pignatta, editor

Published
2020
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45. Performance of Plaster Walls Exposed to High Temperatures

Author

de Sá, Roberta Tabaczenski, Feitósa, Cristovão J. D., Bezerra, José J., Pires, Tiago A. C., Rêgo Silva, José J., Alencar, Cleandro O. S., di Prisco, Marco, Series Editor, Chen, Sheng-Hong, Series Editor, Vayas, Ioannis, Series Editor, Kumar Shukla, Sanjay, Series Editor, Sharma, Anuj, Series Editor, Kumar, Nagesh, Series Editor, Wang, Chien Ming, Series Editor, Piloto, Paulo A. G., editor, Rodrigues, João Paulo, editor, and Silva, Valdir Pignatta, editor

Published
2020
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46. Wood Connections Under Fire Conditions Protected with Gypsum Plasterboard Types A and F

Author

Fonseca, Elza M. M., Leite, Pedro A. S., Silva, Lino, di Prisco, Marco, Series Editor, Chen, Sheng-Hong, Series Editor, Vayas, Ioannis, Series Editor, Kumar Shukla, Sanjay, Series Editor, Sharma, Anuj, Series Editor, Kumar, Nagesh, Series Editor, Wang, Chien Ming, Series Editor, Piloto, Paulo A. G., editor, Rodrigues, João Paulo, editor, and Silva, Valdir Pignatta, editor

Published
2020
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47. Numerical Analysis of Cellular Steel Beams Failure Modes in Fire Conditions

Author

Silva, Jaqueline, Dalcanal, Paola, Mesquita, Luís, di Prisco, Marco, Series Editor, Chen, Sheng-Hong, Series Editor, Vayas, Ioannis, Series Editor, Kumar Shukla, Sanjay, Series Editor, Sharma, Anuj, Series Editor, Kumar, Nagesh, Series Editor, Wang, Chien Ming, Series Editor, Piloto, Paulo A. G., editor, Rodrigues, João Paulo, editor, and Silva, Valdir Pignatta, editor

Published
2020
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48. Durability of Reaction to Fire Performance of Wood Based Panels Through Accelerated Aging Cycles

Author

Mesquita, Luís, Ferle, Lucas, Santos, Gerson, di Prisco, Marco, Series Editor, Chen, Sheng-Hong, Series Editor, Vayas, Ioannis, Series Editor, Kumar Shukla, Sanjay, Series Editor, Sharma, Anuj, Series Editor, Kumar, Nagesh, Series Editor, Wang, Chien Ming, Series Editor, Piloto, Paulo A. G., editor, Rodrigues, João Paulo, editor, and Silva, Valdir Pignatta, editor

Published
2020
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49. Model Error for Calculating the Structural Reliability of Dowel Connections in Fire Situations

Author

Marcolan Júnior, Auro Cândido, Dias de Moraes, Poliana, di Prisco, Marco, Series Editor, Chen, Sheng-Hong, Series Editor, Vayas, Ioannis, Series Editor, Kumar Shukla, Sanjay, Series Editor, Sharma, Anuj, Series Editor, Kumar, Nagesh, Series Editor, Wang, Chien Ming, Series Editor, Piloto, Paulo A. G., editor, Rodrigues, João Paulo, editor, and Silva, Valdir Pignatta, editor

Published
2020
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