砖土混合结构抗震加固振动台试验研究  

Shaking table test of seismic strengthened brick-adobe structure

作　　者：周铁钢[1] 刘博 柯章亮 赵祥[1] 朱立新[2] ZHOU Tiegang;LIU Bo;KE Zhangliang;ZHAO Xiang;ZHU Lixin(School of Civil Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China;China Academy of Building Research,Beijing 100013,China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]中国建筑科学研究院,北京100013

出　　处：《建筑结构学报》2019年第11期56-63,共8页Journal of Building Structures

基　　金：国家科技支撑计划项目(2014BAL06B03);陕西省重点科技创新团队计划(2014KCT-31)

摘　　要：针对我国西北农村地区砖土混合结构抗震性能差的问题,提出设置"弱框架"的加固方法,主要包括在土坯墙关键受力部位内外开槽,对称配置水平与竖向砂浆配筋带加固;角钢-砂浆面层加固四角承重砖柱;木屋盖与墙体顶部后设的砂浆配筋带通过粗铁丝可靠拉结。通过对1/2缩尺模型进行加固及振动台试验,分析其地震反应及损伤情况以验证上述加固措施的有效性。结果表明:9度罕遇地震烈度下,模型仍表现出足够的承载力和变形能力;模型X、Y向刚度下降达到67.72%和77.77%,加固措施有效;模型墙顶X、Y向最大位移角达到1/22、1/19,房屋结构延性得到改善,增强了罕遇地震下结构的抗倒塌性能。Recognizing the poor seismic performance of brick-adobe structures in the northwest rural areas of China,this paper proposes a‘weak framework’reinforcement method as the following,carving grooves in both sides of adobe wall at key regions and symmetrically plastering horizontal and vertical reinforcement mortar strips;reinforcing the brick column by mortar surface layer and angle steel;and connecting the wooden roof and reinforcement motor strips by thick wire at the top of adobe wall.A shaking table test of 1/2 scale reinforced specimen was conducted,and the structural damage and seismic response were investigated to verify the effectiveness of the reinforcement method.The results indicate that under rare earthquake with intensity degree of 9,the specimen still showed sufficient capacity and deformability.The result shows that the reinforcement still works even when the stiffness has a reduction of 67.72%and 77.77%in X and Y direction,respectively.The reinforcement can effectively improve adobe wall’s seismic behaviors and limit the occurrence of cracks;the maximum drift reaches 1/22,1/19 in X and Y direction,respectively,indicating the structural ductility is improved and the anti-collapsed performance can be enhanced under rare earthquakes.

关 键 词：混合结构 抗震加固 砂浆配筋带 振动台试验 地震反应 

分 类 号：TU361[建筑科学—结构工程] TU317.1