单箱多室波形钢腹板PC组合箱梁荷载横向分布

Load transverse distribution of single box multi-cell PC composite girder with corrugated steel webs

为提出简单可行的单箱多室波形钢腹板PC组合箱梁内力计算方法,掌握其荷载横向分布规律,为该类桥梁的设计工作提供参考,将单箱多室波形钢腹板PC组合箱梁等效为平面板梁模型,用刚性横梁法推导其荷载横向分布系数的计算公式;通过1片单箱双室波形钢腹板PC组合箱梁的静载试验研究,验证刚性横梁法在此类桥梁荷载横向分布系数计算中的适用性;通过与1片单箱双室斜波形钢腹板PC组合箱梁及1片单箱双室PC箱梁的静载试验结果进行对比分析,探讨腹板倾角及材质变化对单箱多室波形钢腹板PC组合箱梁荷载横向分布的影响。研究结果表明:刚性横梁法计算所得单箱多室波形钢腹板PC组合箱梁的剪力横向分布偏于保守,而计算所得弯矩的横向分布精度高;与单箱多室PC箱梁相比,单箱多室波形钢腹板PC组合箱梁的荷载横向分布更不均匀;边腹板倾斜与否,仅影响弯矩横向分布,对挠度和支反力横向分布的影响可忽略不计;各模型梁的中支反力横向分布在端部不均匀,边梁支反力横向分布沿桥梁全长基本相同,边梁几乎分担了所有荷载。

In order to get a simple and feasible method for internal force calculation, grasp the load transverse distribution law and provide reference for the design of single box multi-cell girder with corrugated steel webs, a formula for calculating load transverse distribution coefficient of single box multi-cell PC composite girder with corrugated steel webs was deduced with rigid beam method on the basis of equivalent plane plate-girder model, and static load test for a single box double-cell girder with corrugated steel webs was conducted to verify the applicability of the rigid beam method. Impacts of inclination and material of web on transverse load distribution were discussed by static load tests for a single box double-cell girder with inclined corrugated steel webs and a single box double-cell PC girder. The results show that the rigid beam method is prudent for shear transverse distribution calculation, and it has the highest precision for calculation of moment transverse distribution. Load transverse distribution of single box multi-cell PC composite girder with corrugated steel webs is more uneven than that of PC box girder. Inclination of side web has effect on moment transverse distribution, but the effect on deflection and shear transverse distribution can be ignored. Transverse distribution of the middle-branch reaction force is more uneven at the ends. Transverse distribution of the side-beam reaction force is basically the same along the whole length of the bridge. The side girder shares almost all loads. 2 tabs, 9 figs, 22 refs.