建筑结构

2020, v.50(S2) 506-511

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后加混凝土-砌体组合墙片非线性有限元分析研究
Study on the finite element analysis of post-installed reinforced concrete-masonry composite wall

周彬;任晓崧;
ZHOU Bin;REN Xiaosong;Tongji Architectural Design (Group) Co., Ltd., Tongji University;Research Institute of Structural Engineering and Disaster Reduction, Tongji University;

摘要(Abstract):

后加混凝土构件的加固方法是在原有砌体结构外部新增钢筋混凝土构件,形成组合结构。这种加固方法不仅可以增加建筑的使用面积,新增电梯井等公共设备,改善建筑的使用功能,还能大幅度提高既有砌体结构的抗震性能。针对形成的后加混凝土-砌体组合墙片,提出了基于整体式砌体墙片的微观三维空间组合墙片有限元模型,并与组合墙片试验结果进行对比。对比分析表明:所提出的有限元模型基本可以满足组合墙片的抗震性能的分析要求,但无法模拟组合墙片的下降段;有限元分析中破坏的位置与试验基本相同,但由于砌体材料的特点,有限元模拟中无法完全模拟出复合材料的二象性,对于一些砖墙出现的通缝无法模拟;有限元分析中,与试验应变片同位置的应变变化规律与试验相同,应变数值有一定差距,整体趋势一致。
Retrofitting existing masonry buildings by installing the reinforced concrete members around the masonry structure is a new retrofit method. On one hand, it can improve the building function by increasing the construction area, adding the public equipment such as elevator, etc. On the other hand, it can make full use of vertical compressive capacity of existing masonry structure and lateral resistance of post-installed reinforced concrete element, which can improve the ductility and prevent the collapse. In the same time, the finite element model was set up to compare with experiment. The contrast analysis shows that: the overall finite element mode can meet the requirement of seismic performance analysis. But the descending section cannot be simulated. The location of the failure in the finite element analysis is basically the same as that in the test. But the duality of masonry cannot be simulated because of the characteristics of masonry materials. In finite element analysis, the strain variation law of the strain gages is the same as that of the test. But There is a certain difference in strain value. The overall trend of strain is consistent.

关键词(KeyWords): 后加混凝土-砌体组合墙片;有限元分析;极限承载力;延性;滞回特性;破坏模式
post installed reinforced concrete-masonry composite wall;finite element analysis;ultimate bearing capacity;ductility;hysteretic characteristic;failure mode

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作者(Author): 周彬;任晓崧;
ZHOU Bin;REN Xiaosong;Tongji Architectural Design (Group) Co., Ltd., Tongji University;Research Institute of Structural Engineering and Disaster Reduction, Tongji University;

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