索塔锚固区拓扑优化拉压杆模型及预应力构造分析

发布时间：2018-03-17 18:38

本文选题：斜拉桥　切入点：索塔锚固区　出处：《桥梁建设》2017年05期 　论文类型：期刊论文

【摘要】：针对混凝土索塔锚固区承载力准确计算及预应力设计难题,提出拓扑优化拉压杆模型,以龙川枫树坝大桥为背景,采用变密度拓扑优化法构建索塔锚固区拉压杆模型,分析索塔锚固区压杆和节点的承载力、计算环向预应力需求数量,建立索塔锚固区节段有限元模型进行预应力构造优化分析,确定预应力沿高度方向布置方式、预应力盲区设计及预应力配置数量,并对优化后的模型进行应力验算。结果表明:分散布束较集中布束产生的锚固区主拉应力更小;在导管处预应力盲区增加短束可均匀提高塔侧壁的预压应力;受材料泊松效应影响,索塔锚固区预应力钢筋必须适量配置;按提出的拉压杆模型及构造优化方式布置预应力钢束可较好满足索塔锚固区受力要求。
[Abstract]:Aiming at the problem of accurate calculation of the bearing capacity and prestress design of concrete cable tower Anchorage zone, a topology optimization model of tension and compression bar is proposed. Taking Long Chuan Fengshuba Bridge as the background, the tension and compression bar model of cable tower Anchorage area is constructed by using variable density topology optimization method. This paper analyzes the bearing capacity of compression rods and joints in cable tower Anchorage area, calculates the quantity of circumferential prestressing force, establishes the finite element model of cable tower Anchorage zone to optimize the prestress structure, and determines the layout of prestressing force along the direction of height. The design of prestressing blind zone and the quantity of prestress disposition are carried out, and the stress of the optimized model is checked. The results show that the main tensile stress of the Anchorage zone produced by the scattered beams is smaller than that produced by the concentrated bundles. The prestressing stress of the side wall of tower can be increased uniformly by adding short beam in the blind zone of prestress at the conduit, and the prestressed steel bar in the anchoring area of cable tower must be allocated appropriately due to the Poisson effect of material. According to the proposed tension and compression bar model and structural optimization, the prestressed steel bundle can meet the stress requirements of cable tower anchoring area.
【作者单位】：长安大学公路大型结构安全教育部工程研究中心;中交第一公路勘察设计研究院有限公司;
【基金】：国家重点基础研究发展计划(973计划)项目(2015CB057706)~~
【分类号】：U448.27

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