高层建筑混凝土剪力墙免支撑置换受力分析  

STRESS ANALYSIS OF A HIGH-RISE BUILDING WITH RC SHEAR WALLS REINFORCED BY UNSUPPORTED REPLACEMENT METHOD

作　　者：陈大川[1] 郭虹位 CHEN Dachuan;GUO Hongwei(Hunan University,Changsha 410082,China)

机构地区：[1]湖南大学,长沙410082

出　　处：《工业建筑》2020年第9期68-74,共7页Industrial Construction

基　　金：“十三五”国家重点研发计划资助(2016YFC0701308)。

摘　　要：某剪力墙结构高层住宅已建至地上27层,地上一层剪力墙混凝土实际强度低于设计强度。研究采用无支撑剪力墙置换法加固剪力墙,通过现场实测数据和ABAQUS模拟,分析高层建筑剪力墙在无支撑置换过程的竖向承载力和置换后剪力墙抗震性能。实测数据和7个模型试件研究表明,采用分段置换法加固剪力墙在施工过程中能满足剪力墙承载力要求;加固后,置换剪力墙存在应力滞后现象,且采用不同强度的混凝土进行置换施工,对应力滞后现象无明显影响;采用7个应力滞后的置换剪力墙模型试件进行低周往复模拟试验,对比原设计情况下的一次性浇筑剪力墙的相关抗震参数,随着置换混凝土强度等级的提高,分段置换剪力墙抗震性能逐渐提高,满足原抗震设计要求。A high-rise building with shear wall structure has been built to 27 floors above ground,and the actual strength of the shear wall concrete on the ground floor is lower than the design strength.The research used the unsupported shear wall replacement method to strengthen the shear wall.Based on field measured data and ABAQUS simulation,the vertical bearing capacity of the high-rise building shear wall during the unsupported replacement process and the seismic behavior of the shear wall after replacement were analyzed.The measured data and the study of 7 model specimens showed that the shear wall reinforced by segmental replacement method could meet the requirements of the bearing capacity of the shear wall during the construction process;after the reinforcement,there was a stress lag phenomenon in the replacement shear wall and different strength replacement construction of concrete had no significant effect on the stress lag phenomenon;7 quasi-static simulation tests were performed by using 7 shear lag replacement shear wall model specimens,and the relevant seismic parameters of the one-time pouring shear wall under the original design were compared.With the improvement of the strength of the replacement concrete,the seismic performance of the shear wall reinforced by segmental replacement method was gradually improved,which could meet the original seismic design requirements.

关 键 词：无支撑混凝土置换 ABAQUS 应力滞后 低周往复 抗震性能 

分 类 号：TU973.16[建筑科学—结构工程]