分离式空心板梁桥的荷载横向分布系数计算方法

为推动新型分离式空心板梁桥的工程应用，提出针对该桥型的荷载横向分布系数计算方法。选取主梁间距、桥梁跨径、桥宽和梁高作为影响桥梁横向受力性能的参数，采用ABAQUS有限元软件计算不同参数组合的分离式空心板梁桥结构在单车道和多车道荷载作用下的弯矩和剪力横向分布状况，探究关键参数对荷载横向传递的影响规律；通过非线性回归分析法拟合得到弯矩和剪力横向分布系数在不同荷载工况下的计算公式。实桥算例验证结果表明，该方法计算结果可信，具有一定的安全度，能够较好地满足工程设计的要求。

Calculation method of lateral load distribution factor for spread hollow slab bridges

To promote the engineering application of the new spread hollow slab bridge system, a calculation method for lateral load distribution factors was proposed. The beam spacing, span length, bridge width and beam depth were selected as key parameters affecting the lateral load distribution behavior of bridge structures. Finite element models for bridge configurations with different parameter combinations were established using the ABAQUS software, from which moment and shear distribution factors were determined for one-lane and multi-lane loaded cases and effects of aforementioned parameters were analyzed. Furthermore, design formulas of moment and shear distribution factors were obtained via the nonlinear regression analysis method. Comparisons with test results of a practical bridge indicate that proposed formulas are reliable and applicable for structural designs of spread hollow slab bridges in the engineering practice.