混凝土小型空心砌块墙体非线性有限元分析

Nonlinear analysis of concrete small hollow block wall by finite element method

为了控制混凝土小型空心砌块建筑(CSHBB)中的墙体裂缝,提出了一种非线性有限元分析方法.该方法采用通用有限元分析软件ANSYS对不同构造措施和不同结构类型砌块墙体进行了水平和垂直双向荷载作用下的全过程分析,研究了不同类型砌块墙体在平面荷载作用下的应力和位移变化规律以及初裂荷载、极限荷载,分析了各种砌块墙体的整体变形性能,比较了不同构造措施在提高砌块墙体初裂荷载、极限荷载和变形性能方面的作用.同时进行了足尺寸混凝土小型空心砌块墙体的抗侧力试验研究,并把有限元的计算结果与试验结果进行了比较分析.研究结果表明,构造措施能显著提高砌块墙体的整体性能;门窗洞口明显削弱了砌块墙体的抗裂性能;该有限元方法是一种经济有效的分析方法,能替代部分试验研究.

For controlling the cracks in concrete small hollow block building (CSHBB) wall, a nonlinear finite element method was proposed. On the basis of calculation of concrete small hollow block walls with different constructional measurements and different structural shapes by nonlinear finite element method, the total stresses and displacements rule of different walls were studied. Cracking resistant load and ultimate load of walls were discussed, and strength and deformation behaviors of block walls were analyzed. The effects of different constructional measurements on the strength and deformation behaviors for block walls were compared, and experimental study of full size block walls under vertical and lateral loads was conducted. Data between experimental study and calculation were investigated. Results indicate that the global behavior of block walls is improved obviously, and that the crack-resisting behavior of block walls with windows and doors is weakened badly. The nonlinear finite element method is effective for analyzing CSHBB, and can substitute for partial experimental study.