能量法计算框架-剪力墙结构框架倾覆力矩比
摘要：采用抗规方法与轴力法计算框架-剪力墙的框架、剪力墙倾覆力矩比，缺乏明确的推导背景与物理意义，且在工程实践中会得到不合理的结果，并且两种方法得到的结果差异甚大。通过具体算例的计算结果阐述了抗规方法与轴力法不合理的原因，基于虚功原理提出了能量法的计算方法，用侧向力作用下框架部分的总虚内功与结构总虚内功的比值来界定抵抗侧向力的作用占比。分析结果表明：抗规方法忽略了反弯点处相互剪力产生的应变能。采用SAP2000软件，计算了7个平面框架-剪力墙结构体系以及2个三维算例体系作为验证，并说明了理论与应用的合理性。结果表明能量法和基于力法的抗规方法与轴力法相比，物理意义更明确，可以同时考虑弯矩、轴力、剪力三个内力全部作用的影响。
关键词：框架-剪力墙结构；倾覆力矩比；抗规方法；轴力法；能量法
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Energy method to calculate overturning moment ratio of frame in frame-shear structure
Abstract: For frame-shear wall structure, due to the lack of a clear background of derivation and physical meaning, frame-shear wall, shear wall overturning moment ratio calculating seismic code method and axial force method sometimes unreasonable results in engineering practice, and the results obtained by the two methods are often very different. The unreasonable reasons of seismic code method and axial force method were expounded through the calculation of specific examples. Based on the principle of virtual work, the calculation method of energy method was proposed, and the ratio of the total virtual internal work of the frame part to the total virtual internal work of the structure under the action of lateral force was used to define the ratio of resisting lateral force. The results of analysis show that the seismic code method ignores the strain energy generated by mutual shear forces at the reverse bending points. Seven plane frame-shear walls and two practical project examples were calculated by SAP2000 software as verification, and the rationality of the theory and application was explained. The results show that the energy method have more explicit physical meanings than the seismic code method and the axial force method, and the influence of bending moment, axial force and shear force simultaneously can be considered.
Keywords: frame-shear structure; overturning moment ratio; seismic code method; axial force method; energy method
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