Seismic behavior and safety performance of multi-ribbed composite wall

It concerns safety of life and property to improve the structural seismic behavior and construct the safety buildings. Multi-ribbed composite wall (MCW) is one of main bearing members in multi-ribbed composite slab structure (MCSS), which is a new energy-dissipation structure on the basis of controlled seismic response theory. Based upon the tests of MCW under low-cycle lateral loading, lateral resistance and deformation performance of the slab are analyzed. Using neural networks, lateral resistance and drift of the slabs are evaluated, and the average error is kept within 5.4%. The model of skeleton curve and the curve of stiffness degradation of MCW are presented, and the uniform expressions are given. Using ABAQUS programs, skeleton curves of MCW are evaluated and curves from test are brought into comparison. Such key factors as elements selecting, constitutive relation and failure criteria of materials, connection of different members, and cracking of concrete are considered during non-linear finite element analysis. The differences between computed curves and measured curves are discussed, which provides the foundation for successive study. In evolution of MCW drift versus different lateral load during various stages, the computed values from FEM agree well with the test results. The results indicate that full-course of MCW failure go through elastic stage, plastic stage and failure stage, and stiffness of the walls degrade gradually along with lateral loads increasing.