多拱肋异型系杆钢拱桥温度敏感性分析

摘要:

为研究不同形式的温度变化对异型桥梁成桥状态的影响,该文以一座多拱肋异型系杆钢拱桥为工程背景,建立Midas Civil空间有限元计算模型,选取整体温度、梁拱温差、纵桥向索面温差和横桥向索面温差四个参数对其进行敏感性分析,得到各参数对桥梁结构变形、应力和索力的影响程度。结果表明：梁拱温差对桥梁结构变形、应力和索力影响较大,是三者共同的敏感参数；整体温度作用对变形有较大影响,对应力和索力影响较小；纵桥向和横桥向索面温差对索力的影响程度较大,对变形和应力的影响程度较小。。

Abstract:

In order to study the influence of different forms of temperature changes on the completion state of special-shaped bridges, this paper takes a multi-arch rib special-shaped tied steel arch bridge as the engineering background, establishes the Midas Civil space finite element calculation model, and selects the overall temperature, beam arch temperature difference, longitudinal bridge to cable surface temperature difference and transverse bridge to cable surface temperature difference. The sensitivity analysis of the four parameters is carried out to obtain the influence of each parameter on the deformation, stress and cable force of the bridge structure. The results show that the temperature difference between beam and arch has a great influence on the deformation, stress and cable force of bridge structure, which is the common sensitive parameter of the three. The overall temperature effect has a great influence on deformation, and has little effect on stress and cable force. The temperature difference between the longitudinal and transverse cable planes has a greater influence on the cable force, and a smaller influence on the deformation and stress.