斜拉桥主梁模型承载性能试验研究

通过对斜拉桥主梁模型在不同工况及施加横向预应力方案的电测试验,得出了主梁的应力分布规律。试验结果表明,箱梁的撑杆和横向预应力的设计,对箱梁顶板的应力状态有很大影响。施加斜索力后,箱梁顶板的横向拉应力均小于1MPa,除横向预应力作用区域外,箱梁顶板的纵向应力为均匀分布的压应力,若在所有撑杆截面施加横向预应力,则撑杆只出现压应力。文中的试验数据可为优化结构、不同设计方案的选择提供理论根据。同时设计了对模型施加预应力的方法,解决了模型预应力的模拟问题。

Testing Study of Bearing Behavior for Main Beam Model of Cable-Stayed Bridge

Under different working conditions and modes of loading transverse pre-stress, the rule of stress distribution is obtained by resistance strain gauge tests for main beam model of cable-stayed bridge. The results show that the design of box beam struts and transverse pre-stress has a great influence on stress distribution in the top plate of the box beam. After loading the stay cable, the transverse stresses in the top plate of the box beam are less than 1MPa, the longitudinal compressive stresses in the top plate of the box beam are uniformly distributed basically except in the loading zone of transverse pre-stress, the struts present only compressive stress with loading transverse pre-stress in the all section of struts. In this paper, the testing data provide theoretical reference for optimizing structure design and selecting design projects. Simultaneously, the method of loading pre-stress is presented, which could solve the problem of simulating pre-stress.