静力弹塑性分析方法在桥梁结构中的应用探讨

Study on Application of Static Elastoplastic Analysis Method in Bridges Structures

静力弹塑性分析方法由于其简明实用的特点,已经成为近年来评估地震作用下建筑结构非线性反应的普遍方法。它的优点是比非线性动力时程分析方法计算量小,便于工程应用。该文将静力弹塑性分析方法的应用范围扩展到桥梁结构,使用均匀分布和振型荷载叠加,两种水平荷载分布方式,计算了一座实际桥梁结构的非线性反应,并与时程分析的结果进行比较。结果表明对一阶振型在反应中起主要作用的一般的桥梁结构,该方法能得到较好的结果。

The static elastoplastic analysis method has become a popular tool to evaluate the nonlinear reaction of the building structure under the seismic action in recent years because of its simple and useable characteristics. Its advantage is lower computational quantity than the nonlinear dynamic time-history analysis and can be used easily in the engineering. The article extends the application range of the elastoplastic analysis method to the bridge structure, uses two level load distribution modes of the uniform distribution and the oscillation mode superposing. The article calculates the nonlinear reaction of a practical bridge structure and compares the results with the time history analysis. The result shows that the general bridge structure of the first-oscillation mode plays the main action. This method can reach a good result.