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空心板梁桥是我国应用最为广泛的桥型之一,但是在使用过程中出现一系列病害,以铰缝病害最为突出。现阶段空心板梁桥横向计算采用铰接板理论,认为铰缝只传递剪力不传递弯矩。实际大铰缝空心板梁桥横向既有剪力又有弯矩,计算理论需要改进。利用ANSYS对铰缝各个控制截面受力进行分析,验证了铰缝横向受到很大弯矩,现有设计不能满足要求;提出了铰缝的配筋优化方法,并利用欧洲规范中关于新老混凝土截面承载力计算方法,对铰缝进行纵横向抗弯强度、接触面抗压剪强度进行了验算,表明设计满足承载力要求,达到了优化的目的。
Hollow girder bridge is one of the most widely used bridge in our country, but a series of diseases appeared in the course of use, the most prominent is the hinge joint disease. At this stage, the transverse calculation of hollow slab-beam bridge adopts the theory of hinge plate, and it is considered that the hinge joint only transmits the shear force and does not transmit the bending moment. The actual large hinge plate girder bridge has both lateral shear force and bending moment, calculation theory needs improvement. Using ANSYS to analyze the stress of each control section of the hinge joint, it is verified that the hinge joint is subject to a large bending moment in the transverse direction, and the existing design can not meet the requirements. The reinforcement optimization method for the hinge joint is proposed, and the new and old concrete The calculation method of bearing capacity of section, the longitudinal and transverse flexural strength of hinge joint and the compressive shear strength of contact surface were checked, which shows that the design meets the requirements of bearing capacity and achieves the goal of optimization.