考虑剪力墙剪切变形影响的框架-剪力墙结构分析的传递矩阵法

来源期刊:中南大学学报(自然科学版)2015年第3期

论文作者:夏桂云 郭德群 俞茂宏 曾庆元

文章页码:917 - 926

关键词:框架-剪力墙;剪切变形;传递矩阵法;变刚度;固结体系;解析解

Key words:frame-shear wall; shear deformation; transfer matrix method; variable stiffness; fixed system; analytical solution

摘    要:考虑剪力墙剪切变形影响、连梁固结连接条件,利用变分原理,建立框架-剪力墙结构分析模型的微分方程。推导微分方程的初参数解,进而建立适应变刚度结构分析的传递矩阵法,给出均布荷载和倒三角形分布荷载作用的传递矩阵荷载附加项的计算公式,导出顶部集中荷载、顶部集中弯矩、沿高度方向均布荷载和倒三角形分布荷载作用下的挠度、转角、剪力墙弯矩、剪力的计算公式。以2个铰结体系框架-剪力墙为例,对计算公式进行验证。研究结果表明:当连梁等效抗弯刚度为0 kN?m/m时固结体系可退化成铰结体系,当剪力墙抗剪刚度趋于无穷大时,弯剪型剪力墙可退化为不考虑剪切变形的弯曲型剪力墙,因此,本文微分方程可适应于多种模型的计算;采用传递矩阵法分析变刚度框架-剪力墙结构,其计算结果与采用平均刚度法的理论解析解结果较吻合,证明传递矩阵法与平均刚度法都具有可行性,但若提高计算精度,则应采用能考虑变刚度特征的传递矩阵法或有限元法;考虑剪力墙剪切变形影响的本文计算公式所得计算结果与其他公式所得结果有一定差别。

Abstract: Considering the shear deformation effect of shear wall and the rigid joint condition of connecting beam, a differential equation was presented for the analysis of frame-shear wall structures based on the variational principle. The initial parameter solutions to the differential equation were derived, and the transfer matrix method was put forward to analyze the frame-shear wall structures with variable stiffness. The additional items of calculations of frame-shear wall structures subjected to the uniformly distributing load and triangularly distributing load were established using transfer matrix method. The deflection, slope, moment and totel shear force were derived for frame-shear wall structures under the concentrated load and concentrated moment on the top, the uniformly distributing load and triangularly distributing load along the height. By using two hinged systems of frame-shear wall structure as the examples, the derived formulae were checked. The results show that when the equivalent flexural stiffness of connecting beam is 0 kN?m/m, the fixed system is degenerated into the hinged system, and when the shear stiffness of shear wall tends to be infinite, the flexural-shear type shear wall is transformed into the flexural type shear wall without the shear deformation effects, so the present differential equation can be used to analyze multi models of frame-shear wall structures. For variable stiffness structures, the calculating results obtained by the present transfer matrix method agree with those of the analytical solutions obtained by the equivalent uniform stiffness, so both methods are feasible. To obtain high precision, the transfer matrix method and finite element method are preferred to adapt to the variable stiffness structures. When the shear deformation effect of shear wall is considered, the results obtained by the presented formulae in this paper differ from those obtained by other formulae.

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