基于梁格法的箱梁桥活载效应放大系数研究  

Research on amplification factor of moving load effect of box girder bridges based on grillage method

作　　者：万正华 余学林 孙俊昌 李靖江 王泽博 WAN Zheng-hua;YU Xue-lin;SUN Jun-chang;LI Jing-jiang;WANG Ze-bo

机构地区：[1]中南安全环境技术研究院股份有限公司,湖北武汉430040

出　　处：《智能城市》2024年第4期102-104,共3页Intelligent City

摘　　要：文章通过对比单梁模型及梁格模型,分析两种模型下计算结果的差异;通过对比不同跨径箱梁的计算,分析不同宽跨比对活载效应放大系数的影响;通过计算5车道荷载布载及两车道荷载布载,分析两种横向布载方式对活载效应放大系数的影响。研究表明,箱梁的活载效应放大系数与其宽跨比相关,宽跨比越大,相应的活载效应放大系数也越大。当桥梁宽跨比较大时,活载效应放大系数可能超过1.15。传统的简化计算方法并不准确且可能出现两车道荷载效应比5车道大的情况。By comparing single beam model and beam lattice model,the difference of calculation results between the two models is analyzed by comparing the calculation of box girders with different spans,the influence of different width-span ratio on the amplification factor of live load effect is analyzed by calculating 5-lane load distribution and 2-lane load distribution,the influence of two transverse load distribution modes on the amplification factor of live load effect is analyzed.The results show that the amplification factor of live load effect of box girder is related to its width-span ratio,and the larger the width-span ratio,the larger the corresponding amplification factor of live load effect.When the width-span ratio of bridge is large,the amplification factor of live load effect may exceed 1.15.The traditional simplified calculation method is inaccurate and the load effect of two lanes may be larger than that of five lanes.

关 键 词：活载效应放大系数 单梁模型 梁格模型 宽跨比 

分 类 号：U448.2[建筑科学—桥梁与隧道工程]