连续刚构桥合拢温度的合理确定及高温合拢对策

Study on Rational of Determination Joining Temperature of PC Continuous Rigid Frame Bridge and Their Resolutions

以一座大跨预应力混凝土连续刚构桥为工程背景,分析了不同的合拢温度对桥梁结构内力的影响,并指出合拢温度对于连续刚构桥设计的影响主要是对桥墩与桩等有关控制截面最不利组合内力的影响,在一般情况下选择低温合拢对结构受力是有利的;结合该桥高温合拢的实际情况,提出了连续刚构桥在高温合拢情况下采取预施加反顶力的施工对策,并通过结构分析与工程实践证明了采用该措施的有效性。

Based on a long-span PC continuous rigid frame bridge across Xiangjiang River during its construction,the internal forces in the structure of this type bridge caused by different joining temperature were analyzed, It is concluded that the internal forces caused by different joining temperature have important effects on the controlling sections of the bridge piers and piles, and a lower joining temperature is significant in bridge design. When Baishui Bridge is closed at high temperature, a reasonable measurement applied to jacking counterforce has been put forward to ensure the bridge closed successfully in the higher air temperature.