【摘要】 通过模型试验,首先研究了带波形钢腹板大悬臂挑梁的钢-混凝土组合脊骨梁正、负弯矩截面在集中荷载和均布荷载作用下的剪力滞效应,探讨了混凝土板和钢底板上弯曲正应力的横向分布规律;然后基于能量变分原理和换算模量法,提出了多弹性模量、多最大剪切转角差函数和考虑横向预应力影响的组合脊骨梁剪力滞效应的理论计算方法;最后分析了悬臂长度对组合截面剪力滞效应的影响。试验、理论和有限元分析结果的比较表明:组合脊骨梁的正、负弯矩截面均存在明显的剪力滞现象,所提出的理论计算方法能够满足工程设计的精度要求。更多还原

【Abstract】 By the model test at first,shear lag effects in the positive and negative bending-moment sections of steel-concrete composite spine girder(SCCSG) with wide flanges supported by cantilevered beams with corrugated steel web under concentrated load and uniform distributing load were studied,and the transverse distribution laws of bending normal stresses in concrete slab and steel bottom plate were investigated.Then,the theoretical calculation method on shear lag effect in SCCSG was proposed based on the energy-variational principle and the conversion modulus method,in which the multi-modulus of elasticity,the multi-differential functions of maximal shear angle and the influence of transverse prestress were considered.At last,the influences of cantilever length and width-span ratio on shear lag effects in composite sections were also analyzed.It can be indicated from the results comparison of test,theory and finite element method(FEM) that the shear lag phenomenons are obvious in the positive and negative bending-moment sections of SCCSG,and the effectiveness and accuracy of the proposed theoretical calculation method are verified.更多还原