宽幅装配式小箱梁桥荷载横向分布数值分析

Numerical analysis of transverse load distribution of wide fabricated small box girder bridge

为了提高宽幅装配式小箱梁桥荷载横向分布系数计算的适用性与准确性,以30 m宽幅装配式小箱梁桥为例,通过有限元梁格法来研究其宽跨比分别为0.75、1.0、1.25、1.5和2.0时的荷载横向分布变化规律,并与修正偏心压力法、刚接梁法和G-M法等的计算结果做比较。结果表明:与有限元梁格法相比,G-M法的计算结果较为吻合,其误差均小于5%;刚接梁的计算结果误差相对较大,最大误差为5.8%;而修正偏心压力法随着宽跨比的增大,其计算结果的误差会更大,最大误差为-49.5%。

In order to improve the applicability and accuracy of the calculation of the load transverse distribution coefficient of the wide fabricated small box girder bridge,taking the 30 m wide fabricated small box girder bridge as an example,the load transverse distribution law when the width span ratio is 0.75,1.0,1.25,1.5 and 2.0 is studied by the finite element grillage method,and compared with the calculation results of the modified eccentric pressure method,rigid jointed beam method and G-M method.The results show that compared with the finite element method,the calculation results of G-M method are more consistent,and the errors are less than 5%;the calculation results of rigid connection beam have relatively large errors,the maximum error is 5.8%;and with the increase of the width span ratio,the error of the modified eccentric pressure method will be greater,the maximum error is-49.5%.