Experimental Study of Beam-Supported Slabs Under In-Plane Loading


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Title: Experimental Study of Beam-Supported Slabs Under In-Plane Loading

Author(s): Masayoshi Nakashima, Ti Huang, and Le-Wu Lu

Publication: Journal Proceedings

Volume: 79

Issue: 1

Appears on pages(s): 59-65

Keywords: beams (supports): concrete slabs; cracking (fracturing); cyclic loads; diaphragms (concrete); earlhqoake resistant structures; finite element method; floors; loads (forces); models; reinforced concrete; shear strength;stiffness; structural analysis.

Date: 1/1/1982

This paper descrfbes an experimental investigation on the seismic behavior of reinforced concrete beam supported floor slabs as diaphragms in building structures. Scale modeIs of a portion of the floor system were tested to examine in-plane behavior. Variables in the tests were: (1) type of loading (monotonic versus cyclic loading), (2) length of shear span, and (3) intensity of vertical (gravity) load. The in-plane strength of the slab panel was found to be controlled by a crack developing parallel to the loading and along the boundary between the column and middle strips, named a major crack. Cyclic loading or the application of the vertical load reduced the ultimate strength by 15 to 25 percent. In-plane stiffness continuously decreased as load increased. The fracture of reinforcing bars at their intersections with the major crack caused the sfabs to fail. A non-linear finite element modeling of the slab structure resulted in reasonable estimation of the experimental load-deflection curves as weff the crack pattern.