马岭河特大桥索塔锚固区日照温度效应分析

摘要

To study the temperature effect of the anchorage zone in concrete pylon of cable-stayed bridge caused by temperature changes or temperature non-uniformity, the temperature effect of the anchorage zone segments of the asymmetric hexagonal concrete pylon of Maling River Bridge under the action of sunshine radiation was analyzed. The influences of the sunshine radia-tion were equalized as the air temperature rise in the environment around the pylon and the boundary conditions of the pylon structure that considered the sunshine radiation were obtained. By means of the finite element analysis, the worst temperature field distribution of the pylon walls in all directions at different time was determined and the sunshine temperature stress distri-bution corresponding to the temperature fields was obtained as well. The results of the anslysis show that at the inner corner side between the kinked long side and short side of the anchorage zone in the pylon, the temperature tensile stress is the greatest. In the design and construction, the local reinforcement structure of that part of the anchorage zone should be reinforced.%为研究斜拉桥索塔锚固区受温度变化或温度不均而引起的温度效应,针对马岭河特大桥非对称六边形索塔锚固区节段进行了日照辐射作用下的温度效应分析,将太阳辐射的影响等效为索塔周围环境温度的升高,得到了考虑太阳辐射的混凝土索塔结构边界条件；通过有限元分析,确定了不同时刻索塔各方位塔壁的最不利温度场分布,并得到了对应温度场作用下的日照温度应力分布.研究结果表明,索塔锚固区截面折线长边与短边连接部位的内侧转角处温度拉应力最大,设计和施工时应加强该处的局部配筋构造.