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波形钢腹板PC组合箱梁具有自重轻,抗剪强度高,预应力施加效率高等优点。但由于其截面扭转刚度低于常规箱梁,使得结构扭转效应明显。该文运用乌氏第二定理推导波形钢腹板箱梁在偏心荷载作用下约束扭转应力及刚性扭转角计算公式;采用初参数法求解波形钢腹板PC组合箱梁的刚性扭转角、翘曲正应力及扭转剪应力。结合相关文献的实测数据及有限元分析结果验证理论分析方法的准确性,并对波形钢腹板PC组合箱梁桥的扭转性能进行分析。由约束产生的翘曲正应力有限元分析结果为理论计算结果的97.14%,扭转剪应力有限元分析结果为理论计算结果的102.13%。
The corrugated steel web PC composite box girder has the advantages of light weight, high shear strength and high prestressing efficiency. However, the torsional stiffness of the section is lower than the conventional box girder, so that the structural torsional effect is obvious. In this paper, the second law of Wu’s second theorem is used to derive the formula of constrained torsional stress and rigid torsion angle of corrugated steel web box girder under eccentric load. The initial parameter method is used to solve the rigid torsion angle and warp of PC composite box girder with corrugated steel webs Normal stress and torsional shear stress. The accuracy of the theoretical analysis method is verified by the measured data of the relevant literature and the finite element analysis results. The torsional behavior of the PC combined box girder bridges with corrugated steel webs is analyzed. The finite element analysis of the warped normal stress caused by the constraint is 97.14% of the theoretical calculation result, and the finite element analysis result of the torsional shear stress is 102.13% of the theoretical calculation result.