后张法空心板梁端面张拉裂缝的防治

Prevention and Remedy for Tensile Cracks at the Ends of Post-Tensioned Hollow Slabs

通过对某公铁立交桥后张法预应力空心板梁端面张拉裂缝的防治处理,指出了现行规范对预应力梁端面张拉裂缝的控制虽有构造要求,但不够全面具体,对设计而言,实用性还不强,还不能直接依据规范进行配筋设计,而应用有限元分析得到的后张法空心板梁端部横向拉应力配置其端部附加横向钢筋,可有效控制端面张拉裂缝。

Based on the prevention and remedy for tensile cracks at the ends of post-tensioned prestressed hollow slabs of a highway&railway grade separation,it is pointed out that on the control of tensile cracks at the ends of prestressed girders the present standards have not been specified in an overall and specific way though some structural requirements are stated,and on design side especially on reinforcement design it is not practical enough.However,with the transverse tensile stress taken by finite element analysis method,the additional transverse reinforcement at the ends could be designed and the tensile cracks at the ends could be controlled effectively.