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A half-slab precast concrete (HSPC) system with precast bottom layers and in-situ cast top layers has been widely applied in various constructions. It generally behaves as a one-way slab due to the absence of positive-flexural reinforcements in the perpendicular direction to the precast component. However, in some cases, the HSPC was also applied in a two-way slab system. Consequently, a particular design and treatment in the connection between precast members was required, so that the bending moment in two orthogonal directions could be accommodated. In the present study, an innovative rectangular rigid connection (RRC) in a two-way HSPC system was investigated through an experimental test. It was found that the RRC-HSPC presented only a 9.13% reduction of the load at the crack, a 16.44% reduction of the ultimate load, and a 6.06% increase of the deflection at the crack when compared to the monolithic one.

The purpose of this study is to ensure that the building structure is able to withstand the required loads and strengths, as well as meet the applicable technical and safety requirements of the building. With this research, it is expected to create column, beam, and foundation products of North Sumatra generation that can be marketed and meet construction needs in the Sumatra region. The result of this study is in the arrangement of beams by modeling using ETABS, the largest moment is found in the B30 beam span 5.5 meters of type C shophouses, the amount of the moment obtained is worth 153.1883 kNm at the moment of fulcrum and worth 95.0751 kNm at the moment of the field. The deflection that occurs in each shophouse shows that the entire beam span in each type of shophouse meets the maximum deflection requirements, so as to minimize deflection or deformation that can negatively affect the strength or serviceability of a structure. The connection of precast elements using connection products from the Peikko Group is by using the bolted-conncetion concept using anchorbolts and couplers. Conclusion, that the analysis and design of columns, beams, and precast foundations in shophouse planning in North Sumatra can be carried out using analytical and simulation methods using structural software. The results of the analysis show that the design that has been designed is able to withstand the load faced well, and provide stability and security to the structure of the shophouse building. [ABSTRACT FROM AUTHOR]

The modification of conventional precast concrete slab jetty structure into hollow core slab precast concrete slab is done to improve the efficiency and speed of construction execution. The implementation method uses prefabrication or the manufacture of concrete structural elements in the factory and installation in the field. This study examines the change in jetty structure design from conventional precast concrete slab to hollow core slab precast concrete slab. The purpose of this study was to evaluate changes in the design of the jetty structure using hollow core slab precast concrete slabs. The results showed that the use of hollow core slab precast concrete slabs resulted in a reduction in the weight of the structure and increased the efficiency of construction execution. In addition, the modified jetty structure also has the same carrying capacity as the conventional jetty structure. In conclusion, the modification of conventional precast concrete slab Modifikasi Struktur Jetty Pelat Beton Pracetak Konvensional,enjadi Pelat Beton Pracetak Hollow Core Slab 271 Syntax Admiration, Vol. 4, No. 3, Maret 2023 jetty structure into hollow core slab precast concrete slab can improve the efficiency and speed of construction execution while maintaining the same bearing capacity. [ABSTRACT FROM AUTHOR]

Healthy Sedehana Instant House (RISHA) is a residential building construction technology with precast modular components with a knock down system. Based on the structural endurance test certificate, RISHA has structural resistance to earthquake loads up to six zoning with reference to SNI 03-1726-2002. This makes it possible to update the analysis with the latest SNI and apply it to 3- story buildings. This study aims to analyze the mass participation and natural vibration time of the structure based on ETABS and manual calculations, analyze the durability of the superstructure, convert column dimensions from RISHA panel profiles to ETABS, analyze the strength of the column and beam structures and the strength of the connections used. The research method used in this research is quantitative. The research began by conducting a study of the related literature, followed by making structural modeling on ETABS. From the results of the analysis of mass participation according to SNI 1726; 2019 it still meets the requirements, which is above 90%. For the basic shear force about the X and Y axes of 190.39 kN. The structural resistance of beams and columns refers to SNI 2847 2019 and SNI 7833;2019. The deviation between floors that occurs due to earthquake loads has met the requirements because the value is smaller than the deviation between the permitted floors. The structural connection resistance between RISHA panels has an ultimate compressive strength and an ultimate shear force that is smaller than the required compressive strength and nominal shear strength of RISHA panels. Thus the connection meets the requirements of SNI 1729;2020. [ABSTRACT FROM AUTHOR]

One of the innovations in the planning and implementation of today's construction works is the use of precast concrete systems, including precast floor slabs. The use of precast floor slabs that are quite often used is half slab precast. In this study, a simulation of the floor plate and roof slab product modeling using a half slab precast system with one way slab reinforcement will be carried out on the function of the shophouse as a residence and office focused on the North Sumatra region with 6 types of slab types, namely HS-1, HS- 2, HS-3, HS-5 and HS-6. With this modeling simulation, it is hoped that the North Sumatra generation half slab precast product can be marketed and meet construction needs in the Sumatra region. The research methodology used in this research is quantitative. The research began by conducting a study of related literature, then followed by determining the design of shophouses that were often used in North Sumatra. The results of this study are the thickness of the plan plate which refers to the minimum value obtained from the condition of the plate at every possible support condition, which is 16 cm. The amount of deflection that occurs in the floor plate and roof slab based on the results of the analysis using ETABS software, shows the deflection value of 11,633 mm for the shop floor plate which is used as a residence, and 15,131 mm on the shop floor plate which is used as an office, and 15,424 mm on the roof plate., indicating that the type of either floor slab or roof slab meets the maximum deflection requirements, so as to minimize deflections or deformations that can negatively affect the strength or serviceability of a structure. [ABSTRACT FROM AUTHOR]

At this time, the architecture and design of the existing floor plan often changes according to the needs and tastes of the owner in accordance with the changing times. This research was conducted as precast concrete structures become even more important with the increase in man's desire to change the design of his home without spending enormous cost. This study aims to investigate the stiffness and study the behavior of precast concrete between monolith column with no connections and the column with connection. The connection used is dry joint using a plate and screw nut. The results obtained are the stiffness of the test specimen column with no connections is smaller than the test object column with connection. The modulus of elasticity of the column without a connection greater than the column with connection. Cracks that occurred in the test object columns without connection occurs faster than the test object columns with connection and both, flexural cracks occur first and then cracked in shear.

Currently, concrete water tank with ”cast in situ” method has still been using conventional technology and needed long construction schedule. This novel research innovates concrete water tank with ”precast” method which corresponds to Indonesian Standard (SNI) and is able to compete in open market price. The stage of the research begun with an investigation to an existing plant of concrete water tank and testing of characteristic analysis of concrete material and precast panels with variety diameter of wiremess steel as reinforcement. Structural strengths of concrete panels were measured by compression and bending moment tests. The diameter of wiremess steel was decided through optimisation in which concrete water tank is significantly safe if burried beneath a family private garage. Then, an economy feasibility study to measure basic production costs was accomplished and this was compared with the normal price of open market. The research found that concrete panels fulfilled SNI with 25,8 MPa in compression strength test, the lowest bending moment was 157,23 kg.m for panels with 2,6 mm diameter of wiremess steel. This concrete water tank was safe when burried beneath a family private garage with safety factor of 187%. The price of 1000 litre of concrete water tank in Yogyakarta was Rp 1.300.000,00 in which it can compete with conventional concrete water tanks by price of Rp 1.350.000,00 and stainless steel water tanks by price of Rp 2.125.000,00.