多主梁斜交钢桥简化分析方法研究

Research on Simplified Analysis Methods for Multi-Girder Skewed Steel Bridges

摘要:

为提高设计分析效率，准确计算多主梁斜交钢桥的荷载效应，提出采用横向分布系数简化计算此类钢桥，分别采用梁格模型与单梁模型，从钢梁应力、变形、自振频率等指标分析简化方法的适用性。结果表明，多主梁斜交钢桥荷载分布具有空间特性，主要体现在支反力、剪应力不均匀分布。总体上，采用横向分布系数简化计算的单梁模型，在斜交角小于25°时，其应力、变形、疲劳等分析精度能满足实际工程需求。

Abstract:

In order to improve the efficiency of design analysis and accurately calculate the load effects of multi-girder skewed steel bridges, it is proposed to use the lateral distribution coefficients to simplify the calculation of such steel bridges. The beam grillage model and the single-beam model are used to analyze the applicability of the simplification method from the indicators such as steel beam stress, deformation and natural frequency. The results show that the load distribution of multi-girder skewed steel bridges has the spatial characteristics, mainly reflected in the uneven distribution of support reactions and shear stress. Overall, the single-beam model simplified using lateral distribution coefficients can meet the practical engineering requirements for stress, deformation and fatigue analysis when the skew angle is less than 25°.