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在结构设计中,为了计算结构侧移或自振频率,应首先确定结构的刚度。砖填充墙钢筋混凝土框架是由两种材料组合而成的结构,它的刚度,特别是左地震过程中刚度如何变化,尚不能用一般的力学方法来解决。本文计论了砖填充墙钢筋混凝土框架结构的刚度问题。我们从各种类型的很多模型试验中测得了它们在承受单向水平荷载与反复水平荷载下的荷载一位移曲线,经分析简化后提出了较实用的三折线刚度及其计算方法;在动力试验的基础上导出了初始刚度的计算公式。这些公式的计算结果与试验结果都比较吻合。在地震作用下,多层填充墙框架结构各层次之间会出现不同程度的破坏,有的砖墙开裂,有的墙、框均达到屈服,表现出左不同层次之间有不同程度的刚度下降。为此,本文也提供了实用计算方法。
In the structural design, in order to calculate the lateral or natural frequency of the structure, the stiffness of the structure should be determined first. The brick reinforced concrete frame is a structure composed of two materials. Its rigidity, especially how the stiffness changes in the left seismic process, cannot be solved by general mechanical methods. In this paper, the stiffness of reinforced concrete frame structures with brick infill walls is discussed. We have measured the load-displacement curves under various unidirectional horizontal loads and repeated horizontal loads from many types of model tests. After analysis and simplification, we proposed a practical trilinear stiffness and its calculation method; Based on the derived initial stiffness calculation formula. The calculated results of these formulas are in good agreement with the experimental results. Under the action of earthquakes, different levels of damage will occur between the layers of the multi-layered infilled wall frame structure. Some brick walls will crack, some walls and frames will reach yield, showing different degrees of stiffness drop between different levels on the left. . For this reason, this paper also provides a practical calculation method.