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密肋复合墙体具有独特的结构构造形式,其刚度可按不同抗震设防要求进行调整,并可满足复杂建筑形式的要求。该文以框架-剪力墙结构为依据,对框架-密肋复合墙结构协同工作机制及剪力分担率计算方法进行较为系统的研究。基于Timoshenko梁基本理论,将框架-密肋复合墙结构视为由剪切型悬臂框架、弯剪型悬臂梁组成的双重抗侧力体系,采用连续化方法建立框架-密肋复合墙结构的位移微分方程,推导出了计入复合墙剪切变形的水平位移解析表达式和内力计算公式。根据前期试验获得的墙体模型低周反复荷载试验数据,拟合得出密肋复合墙体指数式刚度退化模型,量化了墙体在各变形阶段的刚度退化系数。在此基础上提出不同变形阶段框架-密肋复合墙结构剪力分担率的实用计算方法,并通过算例验证了复合墙刚度退化对结构内力分配的影响程度。
Multi-ribbed composite wall has a unique structural form, its stiffness can be adjusted according to different seismic requirements, and can meet the requirements of complex architectural forms. Based on the frame-shear wall structure, this paper makes a systematic study on the working mechanism of the frame-ribbed composite wall structure and the calculation method of shear contribution ratio. Based on the basic theory of Timoshenko beam, the frame-ribbed composite wall structure is regarded as a double anti-lateral force system composed of shear-type cantilever frame and bending-shear cantilever beam. The displacement of the frame-ribbed composite wall structure is established by the continuous method Differential equation, the analytical expression of horizontal displacement and the formula of internal force included in the shear deformation of composite wall are deduced. According to the low-cycle cyclic loading test data of the wall model obtained in the previous experiment, the exponential stiffness degradation model of the multi-ribbed composite wall is fitted and the stiffness degradation coefficient of the wall in each deformation stage is quantified. On the basis of this, a practical calculation method of shear rate of different deformation stage frame-multi-ribbed composite wall structure is put forward, and the effect of the stiffness degradation of composite wall on the distribution of internal force of structure is verified by an example.