TA760 : Evaluation of seismic performance of RC wide beam-column joints with posttensioled slab under cyclic loading
Thesis > Central Library of Shahrood University > Civil & Architectural Engineering > MSc > 2023
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Today, the use of pre-stressed slabs has expanded greatly due to their many advantages. By using prestressing technology in flat slabs, structures with longer spans and less thickness than normal flat slabs can be achieved, which leads to a reduction in the materials used and the weight of the structure, reducing the height for each floor and bringing the height of the building to the lowest possible level. Bigger, less cracks, slab lightening and maximum performance improvement for horizontal distribution of facilities. posttensioned slabs are usually designed to bear gravity loads in the building, and the use of these systems alone as a lateral bearing system is prohibited in areas with high seismic risk. However, past studies show that these systems have energy consumption capabilities that can be used as an independent lateral load bearing system or a system that can help the lateral load of the structure along with other systems.
In this research, prestressed slab systems were used along with wide beam bending frxame systems in order to investigate their seismic behavior under cyclic loads. The use of bending frxame systems with wide beams is allowed in seismic areas as a lateral load system and also reduces the thickness of the roof. For this purpose, firstly, in order to better understand the seismic behavior of prestressed slabs, a sample of the side connection of the posttensioned slab to the column was verified in the LS-Dyna software, and then in the next step, the wide beam sample of the side connection was verified. In both cases, the effect of various variables, such as final strength, hardness and ductility, etc., were compared and investigated. In the following, by combining these two systems, its seismic behavior was observed in different dimensions and details.
The results indicated that the combination of prestressed slab and wide beam in general increased the load bearing capacity and also increased the initial hardness of the samples. Malleability is one of the increased components in the behavior of the samples, but the deformation capacity of some samples was also witnessed. At the same time, what was common in the studies was the sharp downward trend of the force-drift residual curve after passing the final stress point, which indicated the decrease in energy consumption capacity and brittle behavior when they break.
Keywords:
#reinforced concrete #prestressed #posttensioned #wide beam #bending frxame Keeping place: Central Library of Shahrood University
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