组合桥面板-波形腹板钢箱简支组合梁温度效应

钢-混凝土组合梁桥由于钢和混凝土热工参数的显著差异,使得该类结构在西北高寒、大温差地区受梯度温度影响较突出.以甘肃省某高速公路上一座组合桥面板-波形腹板钢箱简支组合梁为背景,考虑组合桥面板有效刚度、子梁微段内力平衡、子梁间变形协调和腹板剪切变形效应,建立组合箱梁桥温度效应解析计算方法;通过精细有限元数值模拟验证了其可靠...

Temperature Effect of Simply Supported Composite Box Girder with Corrugated Steel Webs and Composite Deck

Aiming at the outstanding problem that the composite bridge is affected by the gradient temperature in the life cycle of the northwest alpine and large temperature difference area. Based on the new-model corrugated steel web (CSW) simply supported composite box girder on a highway in Gansu Province, considering the effective stiffness of the temperature effect of the composite box girder bridge is established by considering the effective stiffness of the composite bridge panel, the internal force balance of the micro-section of the sub-beam, the deformation coordination between the sub-beam and the shear deformation effect of the web.The reliability of the method is verified by fine finite element (FE) numerical simulation. The results show that under the vertical temperature gradient, the bending moment, stress and interfacial shear of the composite box girder are hyperbolic cosine distribution along the beam axis, while the relative slip between layers is hyperbolic sine distribution. Whether the web shear deformation has a great influence on the temperature response at the end of the composite box girder, and the influence range along the beam axis is mainly related to the interlaminar slip stiffness. Ignoring the shear deformation effect of corrugated steel web can easily lead to the small calculation results of interlayer slip in the middle of the beam, but the problems of excessive interlayer shear force and relative slip value near the end of the beam should be paid attention to in the structural design. The influence of temperature difference between composite bridge slab and web interface and concrete line expansion coefficient on the temperature response of the structure can not be ignored. In the design, the adverse effects of the above factors on the structure can be weakened.