大跨度拱桥考虑初始几何缺陷的抗震特性分析

Sesmic Performance Analysis for Large Span Arch with Initial Geometric Defects

山区大跨度钢筋混凝土箱形拱桥在施工中留下的初始几何缺陷会对桥梁抗震特性产生影响,假定在拱箱接头处存在规则的几何缺陷,采用有限元软件分析箱形拱桥存在几何缺陷时对其自振频率和振型的影响。结果表明,考虑初始几何缺陷会使得拱桥的主要自振频率降低,振型发生改变。

The sesmic performance of the large span reinforced concrete arch would be affected by the initial geometric defects remained in construction.The regular defects are assumed in the connect place of arch.Then a finite element software is used to analyze the changes of the frequencies and vibration modes of the large span arch with the defects.Results showed that the defects in the arch decreased the frequency of free vibration and changed the modes.