砌体局部受压有限元分析

摘要

采用有限元方法,分析了典型砌体局部受压时主应力和Mises应力分别沿截面宽度和深度的变化规律.结果表明,最大主拉应力位置与已有试验结果大致吻合；应力云图可清晰地反映砌体局压时的应力扩散作用,主要应力扩散范围约为一倍的局压范围的边长；最大Mises应力值可反映不同局压位置对局压强度的影响,研究成果有助于进一步了解砌体局压的受力机理,为下一步修订规范提供参考.%Finite-element analysis can reveal the complex mechanism of structural element. The principal stress and Mises stress of masonry under local compressive load are analyzed by FEA, and the main variability is the position of local compression. The result shows that the position of the maximum principle tensile stress has a good agree with the experimental result. The stress dispersion can be validated by comparing the stress cloud atlas of various sections,and the dispersion range is about specimen length around the local bearing area. The maximum Mises stress has a strong affect on the increased strength of masonry. It is very helpful for the further study the mechanism of masonry under local compression,and it can also provide a reference for revising the masonry code.