摘要
高墩在成桥阶段墩顶边界条件介于铰接和固结之间,其计算长度系数往往难以取定。现通过构造成桥阶段高墩的形函数,利用能量法求解刚性地基高桥墩成桥阶段的失稳力临界力,又通过欧拉公式求得其计算长度系数,并结合算例采用有限方法和能量法进行计算,对比分析两者计算结果。结果表明:在计算高墩计算长度时,需计入墩顶非理想边界的影响。此外,所推能量法公式计算结果同有限元程序接近,具有较高精度,可供设计参考使用。
The pier top boundary condition of high pier in the finished stage of bridge is between the hinge and consolidation. Its calculation length coefficient is often difficult to take. By constructing the shape function of high pier in finished stage of bridge, the energy method is used to solve the instability force critical force of high pier in the rigidity subgrade in the finished stage of bridge. Also the Euler's formula is used to achieve its calculation length coefficient. Combined with the example, the finite element method and energy method are used to calculate, compare and analyze the calculation results of the both. The results show that it is required to calculate the non-ideal boundary effect of pier top during the calculation of high pier calculation length. In addition, the calculation result of the recommended energy method formula is close to the finite element program with the higher precision, which can be referred for the designs.
出处
《城市道桥与防洪》
2017年第3期75-77,共3页
Urban Roads Bridges & Flood Control
关键词
成桥阶段
高墩
计算长度系数
能量法
finished stage of bridge
high pier
calculation length coefficient
energy method
