Composite Beams with Web Openings

摘要

An ultimate strength model is developed to predict the strength of composite beams at the web openings in the form of moment-shear interaction diagrams. The steel is modeled as an elastic, perfectly plastic material. The yield stress of the steel is defined as a function of the assigned shear stress according to the von Mises yield criterion. The concrete is modeled for ultimate strength behavior. Concrete compressive strength is also defined as a function of the assigned shear stress, based on experimental results. Strain compatibility between the concrete and steel is assumed. The model is compared with experimental results and is used to study the effect of key parameters (material properties, opening size, and opening eccentricity) affecting the strength of composite beams with web openings. A simplified design interaction procedure is presented to conservatively guide the placement of web openings in composite beams.