基于拉压杆模型的混凝土索塔锚固区环向预应力设计方法

Prestress Design for Concrete Pylon Anchorage Zone Based on the Strut-and-tie Models

索塔锚固区是典型的D区(应力扰动区),目前国内外对该区域的预应力配筋设计尚无成熟方法。随着拉压杆模型研究的逐步发展,该理论可运用到索塔锚固区。在阐述拉压杆模型设计法一般步骤之后,以重庆轨道六号线二期蔡家嘉陵江大桥为应用实例,通过二次开发拓扑优化方法建立了索塔锚固区的拉压杆模型,依据该模型进行了锚固区预应力设计,并采用数值模型验证了该方法的有效性。

Pylon anchorage zone is a typical D-region. Due to the geometrical complexity and stress disturbance in this region, there are no well-established approaches available yet for prestress design. With the development of strut-and-tie models （ STM）, this theory can be used for this design. General steps for the STM method were introduced in this paper. Based the project of Cai Jia JiaLing River bridge, the application of the STM through the topology optimization method for cable pylon anchorage zone was presented, then, prestress design based the STM are validated by numerical models.