目前有关钢－混组合箱梁桥的剪切变形对其荷载横向分布影响的研究较少。首先，在考虑自身剪切变形的基础上，采用正弦荷载得出刚度折减系数，并推导出了考虑剪切变形效应的偏心压力法、修正偏心压力法以及考虑剪切变形效应的刚接梁法等，用于计算多梁式波形钢腹板 － 钢底板 － 混凝土顶板 (简称改进型波形钢腹板，即 CSWSB)组合小箱梁桥横向荷载分布系数的方法的计算公式; 然后，选取一多梁式改进型波形钢腹板组合小箱梁桥实桥进行了试验研究; 最后将采用文中讨论的各计算方法计算得到的结果与有限元法结果、试验实测值进行了对比分析。结果表明: 采用考虑剪切变形效应的刚接梁法得到的挠度值和 Ansys 模拟值更为接近，计算跨中的荷载横向分布系数时应采用考虑剪切变形效应的刚接梁法; 当桥梁结构不满足窄桥条件时，宜采用考虑剪切变形效应的刚接梁法计算跨中截面的荷载横向分布系数; 当满足窄桥条件时，可以采用考虑剪切变形效应的修正偏心压力法计算横向分布系数。

At present，there is little research on the influence of shear deformation on the transverse load distribu-tion of steel-concrete composite box girder bridge． Firstly，on the basis of considering its own shear deformation，the stiffness reduction coefficient was obtained by sinusoidal load． The eccentric pressure method，the modified eccentric pressure method and the rigid connection beam method considering the shear deformation effect were used to deduce the calculation formula that calculates the transverse load distribution coefficient of the composite small box girder bridge of multi beam type corrugated steel webs-steel floor-concrete roof (CSWSB)． Then，a real bridge with multi beam type improved corrugated steel webs composite small box girder was selected for experimen-tal study． Finally，the results calculated by the calculation methods discussed in this paper were compared with the results of the finite element method and the test values． The results show that the deflection value of the rigid connection beam method considering the shear deformation effect is closer to the simulation value of ANSYS，and
the rigid connection beam method considering the shear deformation effect should be used to calculate the transverse load distribution coefficient of the midspan． When the bridge structure does not meet the narrow bridge conditions，the rigid connection beam method considering the shear deformation effect should be used to calculate the transverse load distribution coefficient of the midspan section． When the bridge structure meets the narrow bridge conditions，the modified eccentric pressure method considering the shear deformation effect can be used to calculate the trans-verse distribution coefficient．