混凝土索塔塔柱横梁连接段局部应力分析

为了得到某独塔双索面斜拉桥索塔与横梁交接段的空间应力情况,通过空间杆系结构模型计算得到塔柱与横梁连接段的最大弯矩,在整体计算的基础上对索塔与横梁连接段进行空间实体有限元分析。结果表明:在塔柱与横梁交接区域出现较大的负弯矩,塔柱在与横梁交接段呈现外侧受拉内侧受压,横梁底部与塔柱交接的角隅处出现较大的主压应力,应力集中现象明显。

LOCAL STRESS ANALYSES FOR CONNECTING SECTION OF CONCRETE PYLON AND CROSSBEAM

In order to obtain the spatial stresses of the connecting section of concrete pylon and crossbeam of a cable stayed bridge with single tower and double cable plane,the maximum bending moment of the connecting section is obtained through a spatial truss structure model.The spatial finite element analyses of the connection section of pylon and crossbeam are carried out on the basis of the calculation of the whole structure.The results show that negative moment is big in the transition area of pylon and crossbeam,which causes lateral tension outside and compression inside.Large principal compressive stress appears at the comer of the crossbeam and pylon.The stress concentration phenomenon is obvious.