反复荷载作用下DP型烧结多孔砖墙体受力性能试验研究

发布时间：2018-07-26 10:25

【摘要】：为系统研究DP型烧结多孔砖砌体结构的受力性能,对烧结多孔砖横墙和开洞纵墙(共9片)进行低周反复荷载试验。研究了墙体的破坏特征、滞回特性、骨架曲线、刚度退化、耗能能力和延性等,分析了垂直压应力、水平配筋、洞口大小等对墙体受力性能的影响。试验结果表明:DP型烧结多孔砖墙体主要发生剪切破坏,横墙试件滞回曲线饱满,纵墙试件滞回曲线出现捏拢现象;墙体试件的刚度退化较为平稳,耗能能力较强,位移延性系数均大于2.0;增大垂直压应力,试件承受的荷载提高而延性降低;增加水平配筋,试件承受的荷载和变形能力均得以提高。基于试验结果,对现行规范GB 50003—2011墙体受剪承载力计算式中的墙体约束系数进行修正,提出烧结多孔砖墙体受剪承载力的计算式,理论计算值和试验结果符合较好。
[Abstract]:In order to systematically study the mechanical behavior of DP type sintered porous brick masonry structure, the low cycle cyclic loading tests were carried out on the sintered porous brick cross wall and open longitudinal wall (9 pieces in total). The failure characteristics, hysteretic characteristics, skeleton curves, stiffness degradation, energy dissipation capacity and ductility of the wall are studied. The effects of vertical compression stress, horizontal reinforcement and hole size on the mechanical properties of the wall are analyzed. The experimental results show that shear failure occurs mainly in the sintered porous brick wall, the hysteretic curve of the transverse wall specimen is full and the hysteretic curve of the longitudinal wall specimen appears pinch phenomenon, the stiffness of the wall specimen is relatively stable, and the energy dissipation capacity is relatively strong. The ductility coefficient of displacement is more than 2.0; the load of specimen increases and the ductility decreases with the increase of vertical compressive stress, and the load and deformation ability of specimen are improved with the increase of horizontal reinforcement. Based on the test results, the wall constraint coefficient of the current code GB50003-2011 is revised, and the formula of the shear capacity of sintered porous brick wall is put forward. The theoretical calculation value is in good agreement with the test result.
【作者单位】：西安建筑科技大学土木工程学院;西安墙体材料设计研究院;咸阳市墙体材料革新与建筑节能办公室;
【基金】：国家自然科学基金项目(51478382,51408456) 陕西省自然科学基础研究计划项目(2017JM5089)
【分类号】：TU362

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