考虑预制填充墙影响的装配式剪力墙抗震性能试验研究

Experimental Research on Seismic Performance of Prefabricated Concrete Shear Walls with Prefabricated Concrete Infill Walls

为研究考虑预制填充墙影响的装配式剪力墙结构的抗震性能,设计并制作了一栋两层带预制填充墙装配式剪力墙结构的1∶3缩尺试件,分别考虑在模型平面的两个主轴方向布置预制填充墙的情况下,选取三组地震波和八个地震加速度峰值水准,通过振动台试验得到了在不同等级地震波下的预制填充墙对动力特性、损伤形态、加速度响应、位移响应及试件的应变响应等特性。试验结果表明:1)在八度设防和八度罕遇地震激励作用下,模型损伤严重,最终破坏形式为一层剪力墙下端混凝土剥落并形成较多水平通缝。2)在六和七度设防地震作用时,模型基本处于弹性状态,预制填充墙的存在加大了墙体的抗侧刚度,减少了墙体地震加速度反应;在八度多遇和七度罕遇地震工况作用时,试件逐步进入弹塑性阶段,预制填充墙慢慢失去作用。3)低于八度罕遇地震时,预制填充墙对剪力墙结构的抗侧刚度具有明显的增大效应;八度罕遇地震等级,模型损伤严重,预制填充墙基本失去了作用。

In order to study seismic performance of prefabricated concrete shear walls with prefabricated concrete infill walls,a model of 1∶3 scale with two-story prefabricated concrete shear walls and prefabricated concrete infill walls was designed and fabricated.Considering the models with prefabricated concrete infill walls along the two principal axis directions of the structural plane respectively,three sets of seismic waves and eight seismic acceleration peak levels,the dynamic characteristics,damage modes,acceleration responses,displacement responses and strain responses of models excited by different levels of seismic waves were obtained by shaking table tests.The results showed that:1)excited by fortification earthquakes and rare earthquakes of 8 degrees,the model was severely damaged,and the final failure mode of the model was that concrete at the bottom of the first-floor shear wall peeled off and formed many horizontal through cracks.2)The model was basically in the elastic state excited by 6-degree earthquakes and fortification earthquakes of 7 degrees.The existence of the prefabricated concrete infill walls increased the lateral stiffness of shear walls and reduced seismic acceleration responses of shear walls.Subjected to the frequent earthquakes of 8 degrees and the rare earquakes of 7 degrees,the elastic-plastic deformation occurred in models gradually,and the effect of prefabricated concrete infill wall gradually decayed.3)under rare earthquakes below 8 degrees,prefabricated concrete infill walls were of a significant effect increasing lateral stiffness of shear walls;under rare earthquakes of 8 degrees,the model damaged severely,and prefabricated concrete infill walls did not play a basic role.