【摘要】 本文利用积函数极值法，从地震作用的角度出发，推导并建立了已建立交桥桥墩的基底剪力的表达式。将立交桥结构简化为多自由度的空间杆系，研究了基底剪力的计算方法。已建立交桥在强烈地震作用下，结构可能进入非线性阶段，本文探讨了怎样利用积函数极值法分析结构的非线性问题的途径。更多还原

【Abstract】 In this paper, the method of extremum of the product function is used to analyze upper bound seismic base shear force of the existing overpass and the calculation formulas are gotten. In addition, subjected to the strong earthquake, the existing overpass structure will get into nonlinear process, so we put forward an analysis method based on the method of the product func- tion to study nonlinear problem.更多还原