水平地震下RC剪力墙结构层间位移角限值评估

EVALUATION OF INTER-STORY DRIFT ANGLE LIMITS OF REINFORCED CONCRETE SHEAR WALL STRUCTURES UNDER HORIZONTAL EARTHQUAKES

  • 摘要: 为评估现行规范水平地震作用下钢筋混凝土(RC)剪力墙结构层间位移角限值的合理性,与美国规范对比,构建50个RC剪力墙数值模型结构进行非线性分析,探讨场地类别、设防烈度和结构高度等因素对剪力墙层间位移角富裕度比值βC/A的影响规律。提出位移角限值建议值,逐步放松位移角,评估放松位移角后结构在罕遇地震下的安全性;用同样方法讨论广东省标准《高层建筑混凝土结构技术规程》放松位移角限值的合理性。结果表明:βC/A值均大于1,表明我国规范中剪力墙结构层间位移角限值比美国规范严格;以建议值1/550作为层间位移角限值设计剪力墙结构是安全合理的,说明广东省标准《高层建筑混凝土结构技术规程》以1/180为中震作用下RC剪力墙结构弹性层间位移角限值具备合理性。

     

    Abstract: To evaluate the rationality of the inter-story drift angle limit of reinforced concrete shear wall structures under horizontal earthquake actions in current Chinese code, this paper established 50 reinforced concrete shear wall numerical model structures for nonlinear analysis by comparing with the American code. Then the influence of various factors (such as site type, fortification intensity and structure height) on the ratio of drift angle abundance (βC/A) between Chinese and American codes was analyzed, and the relaxing inter-story drift angle limit was recommended to evaluate the safety of the structure under rare earthquakes after relaxing the drift angle. In the same way, the rationality of relaxing drift angle limit in Guangdong Provincial Standard "Technical Specification for Concrete Structures of High-Rise Buildings" was discussed. The results show that all βC/A values are greater than 1, which indicates that the inter-story drift angle limit in Chinese codes is stricter than that in American codes. Structure design using the recommended value of 1/550 as the inter-story drift angle limit for reinforced concrete shear wall structures is safe and reasonable. It is verified that the limit value of 1/180 for elastic inter-story drift angle of reinforced concrete shear wall structures under fortification earthquakes, as specified in the standard of Guangdong Province, is reasonable.

     

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