均布荷载作用下钢-混凝土组合梁界面滑移近似计算及其效应分析

为了计算钢-混凝土组合梁的截面滑移及其对梁强度和刚度的影响。提出了具有界面滑移的钢-混凝土组合梁的总荷载及截面总弯矩由2部份组成。不考虑滑移的组合梁承担整体荷载及整体弯矩，能自由滑移的叠合梁承担局部荷载和局部弯矩。基于Bernoulli梁理论和抗剪连接件线性剪力-滑移模型。建立截面总弯矩分配的计算公式．给出均部荷载作用下简支组合梁的栓钉剪力及界面滑移近似计算公式。得到了考虑滑移的组合梁在弹性阶段截面弹性应力、跨中挠度的计算公式及挠度增大系数。

Approximate method for analysis of interface slip and its effect on steel-concrete composite beams under uniform distribution loads

A method for analyzing the performance of steel-concrete composite beams with interface slip was developed in this paper. In the model an assumption was made that the total moment of a composite beam with interface slip was consisted of a global moment that was borne by a composite beam without interface slip and a local moment that was borne by a superposltion beam with freely interface slip only, Then, a formula for moment allocation of a beam was developed based on Bernoulli beam theory and shear-slip model of shear connector. The formulas of interface slip and shear force of shear connector, stress in the cross-section and the deflection of beam in elasticity state were given for simply-supported beams under uniform distribution loads.