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为了掌握异型索塔钢锚箱在索力作用下的受力性能和应力分布,以某主跨555m长的三塔斜拉-自锚式悬索组合体系桥为工程背景,通过ANSYS中APDL命令流参数化编程,分别采用空间实体单元与壳单元建立了不同的索塔钢锚箱有限元模型,对索塔锚固区在最不利荷载组合作用下的受力性能进行了研究,并考虑了在不同加力方式下钢锚箱应力状态和分布特点。结果表明:在最不利荷载组合作用下,采用初应变加力方式,在锚垫板与承压板位置处应力较集中;采用均布力加载方式下,实体单元与壳单元计算结果较为吻合,能真实反映钢锚箱受力状态,但壳单元角点接触部位易出现应力计算失真。此计算结果为设计提供依据,对同类型的桥梁设计有一定的设计参考价值。
In order to grasp the stress performance and stress distribution of the special-shaped steel tower box under the action of cable force, taking a 555m-long three-tower cable-stayed-self-anchored cable system bridge as the engineering background, through the ANSYS APDL command Flow parametric programming, the finite element model of steel box for anchorage of anchor cable was established by using the spatial solid element and the shell element, respectively, and the mechanical properties of anchorage zone under the most unfavorable load combination were studied. Stress state and distribution characteristics of steel anchor box under different methods of adding force. The results show that under the combination of the most unfavorable load, the initial strain and force mode are adopted, and the stress is more concentrated at the anchor plate and the pressure plate. With the uniform load loading method, the calculation results of solid element and shell element agree well, Can truly reflect the steel anchor box stress state, but the shell element corner contact prone to stress calculation distortion. The calculation results provide the basis for the design, and have certain design reference value for the same type of bridge design.