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.
DOI:
10.14359/10882
Date:
1/1/1982
Abstract:
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.