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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 provide a simple and feasible method for calculating the internal force of PC composite box girder with single chamber and multi-room corrugated steel webs and to grasp the transverse distribution of load, this paper provides a reference for the design of such bridges. Single box multi-chamber corrugated steel web PC composite box The beam is equivalent to a flat plate beam model, and the formula for calculating the transverse distribution coefficient of the load is deduced by using the rigid beam method. The static load test of a single box dual corrugated steel web PC composite box beam verifies that the rigid beam method The feasibility of calculating the transverse distribution coefficient of the bridge load of similar type of bridge is compared and analyzed by comparing with the static load test results of PC single box girder with single corrugated steel web and single box double cell PC box girder, Effect of slab inclination and material change on load lateral distribution of PC composite box girder with single chamber multi - room corrugated steel webs. The results show that the transverse shear distribution of PC composite box girder with single box multi-room corrugated steel web calculated by the rigid beam method is somewhat conservative and the lateral distribution accuracy of the calculated bending moment is high. Compared with single box multi-chamber PC box girder The transverse load distribution of PC composite box girder with single box multi-room corrugated steel webs is more non-uniform. The inclination of the webs only affects the transverse distribution of bending moment, but negligibly affects the transverse distribution of deflection and support reaction force. The lateral force of each model beam is transversely distributed at the ends unevenly. The lateral force distribution of the side beams is basically the same along the whole length of the bridge, and the side beams share almost all the loads.