在装配式双构件顶拱结构的实际拼装过程中因行程不同步易导致千斤顶虚托现象。本文基于三维数值计算,分析了不同虚托条件下装配式双构件顶拱结构的力学性能,并依据最大主应力失效准则,完成了不同虚托状态下装配式顶拱结构的力学性能评价,研究分析发现：(1)上部承托平台虚托时,结构内部最大主应力向压应力趋势发展；(2)下部承托平台虚托时,结构内部最大主应力向拉应力趋势发展；(3)仅上部承托平台虚托时,装配式双构件顶拱结构主体均满足最大主应力抗拉设计限值；(4)出现任一下部承托平台虚托时,装配式双构件顶拱结构局部区域将不满足最大主应力抗拉设计限值,与原始状态比,结构受拉幅值增加567%~841%不等。

In the actual assembling process of the prefabricated double - member arch structure, the phenomenon of jack empty support is easy to be caused by the asynchronism of the stroke. Based on the three-dimensional numerical calculation, the paper analyzes the different empty of the fabricated under the condition of double component top arch structure, mechanical properties, and on the basis of maximum principal stress failure criterion, completed the different empty mechanical properties of the fabricated under roof arch structure, evaluation, research and analysis found that: (1) the upper supporting platform for empty when, structure of inner development trend of maximum principal stress to compressive stress; (2) When the lower supporting platform is in empty support, the maximum principal stress in the structure develops towards tensile stress; (3) When only the upper supporting platform is in empty support, the main body of the prefabricated double-member top arch structure meets the maximum principal stress tensile design limit; (4) When there is any empty support of the lower supporting platform, the partial area of the prefabricated double-member top arch structure will not meet the maximum principal stress tensile design limit. Compared with the original state, the tensile amplitude of the structure increases by 567% to 841%.

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北京城建集团创新项目(新型预制装配式地下车站结构模型试验研究)；国家重点研发计划(2017YFB1201104)