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用构造柱来提高多层砖房的抗震能力已为国内外所采用,墙体的抗震能力以其最大变形能力来衡量。同时知道了最大变形,才可能对墙体的抗震能力作一个确切的估计。 本文用有限元法做了带构造柱墙体的弹塑性及墙体开裂分析,计算出一墙体的最大变形及最大承载能力,并根据其计算结果提出了倚化计算最大位移和承载能力的方案。 弹塑性分析是非线性问题,我们用增量—初应力法求解。为了加速初应力迭代过程的收敛速度,本文提出了最佳加速因子的计算方法。 砖砌体实际上是一个非均匀介质,为了方便本文用均匀介质的办法处理。但对这种非均匀介质砖砌体,本文提出了剪切拉压开裂破坏准则,以解决由于灰缝引起的不均匀性。根据这个准则,计算出的初开裂形式基本上与实验符合。 本文最后提出一个工程实用简化计算方案。
The use of structural columns to improve the seismic resistance of multi-story brick houses has been adopted at home and abroad. The seismic capacity of walls is measured by their maximum deformation capacity. At the same time knowing the maximum deformation, it is possible to make an exact estimate of the seismic capacity of the wall. In this paper, the elasto-plastic analysis and wall cracking analysis of the wall with structural columns are performed by using the finite element method to calculate the maximum deformation and the maximum bearing capacity of a wall. Based on the calculation results, the maximum displacement and bearing capacity of the wall are calculated. Program. Elastic-plastic analysis is a nonlinear problem. We use the incremental-initial stress method to solve it. In order to accelerate the convergence rate of the iterative process of initial stress, this paper presents the calculation method of the best acceleration factor. The brickwork is actually a non-homogeneous medium and is treated with a uniform medium for the sake of convenience. However, for this kind of inhomogeneous medium brickwork, this paper puts forward the criterion of shear tension and pressure cracking to solve the inhomogeneity caused by the mortar joint. According to this criterion, the calculated initial cracking pattern basically conforms to the experiment. At the end of this paper, a practical simplified calculation scheme for engineering is proposed.