大跨度斜拉桥结构偏载效应研究

STUDY ON EFFECT OF ECCENTRIC LOAD OF LONG-SPAN CABLE-STAYED BRIDGE

大跨度斜拉桥箱梁的几何构造对约束扭转正应力的影响沿桥的跨度是变化的,使得荷载的内力影响面的形状较为复杂,同时沿桥纵向偏载系数也是变化的。通过偏载力学理论分析和实际斜拉桥的ANSYS有限元建模计算,研究了变截面预应力波形钢腹板部分斜拉桥偏载系数沿跨度的分布规律,提出实用的偏载系数取值建议,可为同类大跨度桥梁工程的设计提供参考。

For long-span cable-stayed bridge, the shape of the internal force influence surface of the load is complicated and the load factor is changed along the longitudinal direction of the bridge, because the influence of the geometrical structure of the box girder on the torsional normal stress varies along the span of the bridge. Through the partial load s theoretical analysis and actual cable-stayed bridge ANSYS finite element modeling calculation, this paper explores distribution laws of load coefficient along the spans in the long-span cable-stayed bridge with corrugated steel webs and proposes practical load coefficient to offer some recommendations for engineering design.