INVESTIGATION OF PUNCHING SHEAR DESIGN APPROACHES IN TURKISH BUILDING EARTHQUAKE SPECIFICATION FOR INTERIOR SLAB-COLUMN CONNECTIONS

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2023-1

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Özden, Mustafa Yavuz

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Flat plate sytems are very critical due to possible punching failure at slab-column connections. Importance of having reliable design and guidelines on punching shear design of slab-column connections under lateral loads have been shown in the past for zones under high seismic risk. In the new Turkish Building Earthquake Specification published at 2018, there are two different method to analyze slab-column connections. First one is eccentric shear stress model which is also included in ACI 318-19. Second one is the use of finite element method. In this study, analysis methods included in the new Turkish Specification, TBDY 2018 for slab-column connections were evaluated in the light of experimental results. Moment capacities of interior slab-column connections of experimental test specimens were estimated by using two different analysis method i.e. eccentric shear stress model and finite element model then results were compared with expereimental results. In the scope of the finite element model, two different approaches were examined to estimate moment capacity of the connection. In addtion, effect of mesh size were also investigated for the finite element analysis-based design. Effect of flexural reinforcement ratio and gravity shear ratio on the ratio of unbalanced moment carried by eccentric shear (γv) was also investigated and simple proposal was made. While estimating the new γv, only experimental results of square column were used to ignore effects of column aspect ratio on the ratio of unbalanced moment carried by eccentric shear.

Subject Keywords

Flat-Plate Slab Systems, Punching Shear Design, Eccentric Shear Stress Model, Ratio of unbalanced moment carried by eccentric shear, Flexural reinforcement ratio (ρ), gravity shear ratio (Vu/Vn)

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https://hdl.handle.net/11511/102528

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

M. Y. Özden, “INVESTIGATION OF PUNCHING SHEAR DESIGN APPROACHES IN TURKISH BUILDING EARTHQUAKE SPECIFICATION FOR INTERIOR SLAB-COLUMN CONNECTIONS,” M.S. - Master of Science, Middle East Technical University, 2023.