考虑现浇楼板影响的砖砌墙体抗震性能研究

基于ABAQUS建立砌体墙片有限元模型,与选取的试验墙片结果进行对比,验证有限元模拟的可信度;再利用有限元模型分别研究现浇楼板、砂浆强度、圈梁截面尺寸、墙顶竖向压应力、开洞率和墙片高宽比对砌体墙片抗震性能的影响。结果表明,现浇楼板、构造柱和圈梁共同构成整体,加强了对墙片的约束,减轻了墙片的损伤;提高砂浆强度等级,墙片的承载力和延性将增大;适当的圈梁截面尺寸能有效减轻墙片的破坏程度;适当的墙顶竖向压应力能显著降低墙片的破坏程度;墙片开洞会降低其承载力和位移延性;增大墙片的高宽比,墙片的承载力将减小,且墙片主要破坏形式从剪切型破坏转化成弯曲型破坏。

Seismic performance of brick masonry walls considering the influence of cast-in-situ floor slabs

With the help of finite element software ABAQUS, the numerical analysis results of the finite element model of the masonry walls were compared with the experimental results to verify the reliability of the finite element simulation. Based on this, the effects of the cast-in-situ floor slabs, the strength of mortar, the cross-sectional dimension of ring beams, the vertical compressive stress on the top of walls, and the opening and aspect ratios of walls on the seismic performance of masonry walls were investigated. The results show that the cast-in-situ slabs, the constructional columns and ring beams form a complete structure, strengthening the constraint on the wall sheet and reducing the damage. The bearing capacity and ductility of walls increase with the increase of mortar strength. Appropriate cross-sectional dimension of ring beam and vertical compressive stress on the top of walls can effectively reduce the damage of masonry walls. The bearing capacity and displacement ductility of walls decrease with the opening of walls. The bearing capacity of walls decreases with the increase of the aspect ratio of walls. At the same time, the main failure mode of walls changes from shearing failure to bending failure.