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根据某实际工程,设计1∶2缩尺的纵向和横向两种组合墙体试件进行低周反复荷载试验。针对后加混凝土构件-砌体组合墙体的承载力、延性、滞回特性、耗能能力及破坏模式、混凝土构件的应变和钢筋的应变发展过程等进行研究。结果表明:“拉结(剪切)钢筋+植筋”的连接节点具有可靠的连接性能,可以保证既有砌体结构与后加混凝土构件的协同工作;后加混凝土-砌体组合墙体具有更高的承载力及变形能力;通过等效黏滞阻尼系数对比分析可知,后加混凝土墙体提高了砌体墙的耗能能力;提出了后加混凝土-砌体组合墙体受剪承载力计算式,且与试验结果吻合较好。
According to a practical project, a 1: 2 scale vertical and horizontal composite wall specimens were designed for low cycle repeated loading test. Aiming at the bearing capacity, ductility, hysteretic characteristics, energy dissipation capacity and failure modes of the post-added concrete-masonry composite wall, the strain of the concrete member and the strain development process of the steel bar are studied. The results show that: the connection node of “RCC (shear) steel + planting bar” has reliable connection performance, which can ensure the cooperation between the existing masonry structure and the post-added concrete component; after adding the concrete-masonry composite wall Compared with the equivalent viscous damping coefficient, it can be seen that the concrete wall increases the energy dissipation capacity of the masonry wall, and the post-added concrete-masonry combined wall is sheared Bearing capacity formula, and with the test results agree well.