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本文应用ANSYS软件建立了体外预应力肋式转向部位的精细化模型,采用solid65单元模拟转向块和附近梁段混凝土,link8单元模拟预应力管道周围环向钢筋,孔道壁压力荷载等效预应力索的转向力。转向块的应力分析结果表明:肋式转向块主要通过孔道上部混凝土的受压和受剪抵抗预应力转向力的作用效应,孔道下部混凝土的拉应力较小;肋式转向块孔道上方受压部分厚度可适当优化,达到充分发挥混凝土的材料性能;肋式转向块最大压应力位置在靠近腹板的体外束孔道上缘,在距离预应力孔道3倍直径处,混凝土压应力已基本分布均匀。
In this paper, ANSYS software was used to establish the refined model of externally prestressed rib-type steering parts. The solid65 unit was used to simulate the steering block and the adjacent beam section concrete. Link8 element was used to simulate the circumferential reinforcement around the prestressed pipe and the equivalent prestressing force The steering force. The stress analysis results of the steering block indicate that the rib-type steering block mainly receives the effect of the compression and shear resistance of the concrete in the upper part of the tunnel and the prestressing steering force, and the tensile stress of concrete in the lower part of the tunnel is smaller. The thickness can be properly optimized to achieve the full play of the material properties of concrete; the maximum compressive stress of the rib-type steering block is close to the upper edge of the beam channel of the outer body of the web; and the compressive stress of the concrete has been basically evenly distributed 3 times the diameter of the prestressed tunnel.