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研究了大型电力主厂房框排架结构地震时非弹性扭转的特点。以某实际工程结构设计方案为背景,建立了非线性有限元模型,分析了结构侧移、非弹性扭转及主要结构构件的内力变化,揭示了钢支撑屈曲失稳是导致框排架结构非弹性扭转并突增的主要原因。非弹性扭转具有突增性,可形成畸变位移场,对处于屋架、吊车标高部位的连接件、预埋件等低延性关键部件构成威胁。针对规范定义的扭转位移比参数,研究了其难以反映非弹性扭转的现象和原因。建议了减控非弹性扭转及其突增的技术措施。
The characteristics of non-elastic torsion during the earthquake of large-scale power plant frame and frame structure are studied. Based on the design of a practical engineering structure, a nonlinear finite element model was established to analyze the structural lateral displacement, inelastic torsion and internal force variation of the main structural members. It was revealed that the buckling of the steel brace is the result of inelastic The main reason to reverse and sudden increase. Non-elastic torsion with sudden increase, the formation of distortion displacement field, in the roof trusses, elevation parts of the connector, embedded parts and other low-ductility threat to the key components. According to the parameters of torsional displacement ratio defined by the standard, the phenomena and causes of inelastic torsion are difficult to be studied. It is suggested that the technical measures of reducing and controlling inelastic torsion and its sudden increase should be proposed.