波形钢腹板组合箱梁剪力滞效应的比拟杆法求解

Bar Simulation Method on Shear Lag Effect of Composite Box Girder with Corrugated Steel Web

波形钢腹板组合箱梁是新型组合梁,其剪力滞效应不可忽略.本文结合比拟杆法,忽略波形钢腹板对其弯矩的贡献,推导了波形钢腹板简支梁在荷载作用下的正应力计算式,并对叠加法求解波形钢腹板连续梁的正应力做了简单介绍.分别采用模型试验、有限元分析、三杆比拟叠加法计算了模型梁在均布荷载作用下的正应力和剪力滞效应,可为以后类似桥型的设计计算提供借鉴.

Composite box girder with corrugated steel web is a new type composite beam and its shear lag effect cannot be regardless. Based on bar simulation method of traditional box girder, and with regardless of the contribution of corrugated steel web to its bending moment, this paper deduces normal stress calcula- tion formulas of free beam with corrugated steel web under concentrated force and uniform force, and introduces superposition method to normal stress of continuous girder with corrugated steel web. Normal stress and shear lag effect of model girder under uniform force is studied by calculating model test, finite element model and 3-bar simulation superposition method,which can be used to design similar bridges.