Experimental Study and Theoretical Analysis of Steel–Concrete Composite Box Girder Bending Moment–Curvature Restoring Force

A steel–concrete composite box girder has good anti-seismic energy dissipation capacity, absorbs seismic energy, and reduces action. It is very suitable for high-rise super mega structure systems, which in accordance with the condition of capital construction. In order to accurately study elastic–plastic response structure, restoring force model building primary problem that needs be solved. Previous research shows shear connection degree, ratio, web height–thickness ratio are major factors influence bearing capacity behavior. this paper, low cycle vertical load tests four girders were conducted different degrees ratios height thickness. The behavior a was analyzed depth, such as hysteresis law, skeleton curve, stiffness degradation etc. degree thickness on performance investigated. three-fold line bending moment–curvature curve established. On basis experimental data theoretical analysis, formula positive negative obtained. Furthermore, maximum point orientation calculated results agree well results. accuracy proposed method verified. calculation simple clear, convenient hand calculation, engineering applications.