某后张法预应力混凝土T梁锚固区优化研究

Research on Optimization of Anchorage Zone of a Post-tensioned Prestressed Concrete T-beam

后张预应力混凝土的锚固区受到预应力锚固集中力的作用,存在局部承压和应力扩散问题,是混凝土桥梁中的典型应力扰动区。通过力学分析后张法总体锚固区存在的劈裂力、剥裂力及边缘拉力,建立有限元实体模型,对某后张法预应力混凝土T梁锚固区不同预应力配束进行了对比计算,结果表明,合理的配束设计能有效降低锚固区的劈裂应力与剥裂应力。

The anchorage zone of the post-tensioned prestressed concrete is affected by the concentrated force of prestressed anchorage,which has the problems of local bearing and stress diffusion.It is a typical stress disturbance zone in concrete bridges.The finite element solid model is established through the mechanical analysis of the splitting force,stripping force and edge tension in the overall anchorage zone of the post-tensioned method,and the different prestressed tendon distribution in the anchorage zone of a post-tensioned prestressed concrete T-beam is compared and calculated.The results show that,the reasonable tendon distribution design can effectively reduce the splitting stress and peeling stress in the anchorage zone.