宽箱梁横向分布系数计算探讨

Discussion on the Calculation of Transverse Distribution Coefficient of Wide Box Girder

汽车、人群荷载是桥梁可变作用中的主要荷载,直接影响着桥梁结构设计。对于多片梁桥而言,梁体之间的协同工作能力决定了荷载的横向分布。简支梁桥常采用单梁模型考虑横向分布系数进行结构计算,因此,获得准确的横向分布系数至关重要。对于宽箱梁而言,常规横向分布系数计算方法的准确性和适用性需要进行分析。本文采用Ansys建立了实体分析模型,通过与常规横向分布系数的计算方法对比,结果表明:对于算例桥梁,相对于实体分析模型结果,采用常规横向分析系数计算方法得到的结果偏小约12%,采用常规算法较为危险,可为类似宽箱梁桥工程设计提供参考。

Automobile and crowd loads are the main loads in the variable action of the bridge,which directly affect the bridge structure design.For multi beam bridges,the cooperative working ability between beams determines the transverse distribution of load.Single beam model is often used to calculate the structure of simply supported beam bridge considering the transverse distribution coeff icient,so it is very important to obtain the accurate transverse distribution coefficient.For wide box girder,the accuracy and applicability of the conventional calculation method of transverse distribution coefficient need to be analyzed.In this paper,the solid analysis model is established by Ansys.Compared with the calculation method of conventional transverse distribution coeff icient,the results show that for the example bridge,compared with the results of solid analysis model,the results obtained by conventional transverse analysis coeff icient calculation method are about 12%,and it is dangerous to use conventional algorithm,which can provide reference for the engineering design of similar wide box girder bridges.