再生混凝土的低温抗震性变化对比分析  

Comparative Analysis of the Seismic Behavior of Recycled Aggregate Concrete at Low Temperature

作　　者：关宏洁[1] 王群[1] 田晶 GUAN Hongjie;WANG Qun;TIAN Jing(Xi’an Eurasia University,Xi’an 710065,Shaanxi,China;Xi'an Institute of Architectural Design and Research Co.LTD,Xi’an 710054,Shaanxi,China)

机构地区：[1]西安欧亚学院,陕西西安710065 [2]西安市建筑设计研究院有限公司,陕西西安710054

出　　处：《地震工程学报》2019年第2期326-331,共6页China Earthquake Engineering Journal

基　　金：陕西省自然科学基金项目(KL-SEER-ME-201203)

摘　　要：再生混凝土作为建筑材料在被使用前,需要对其低温抗震性能做出分析。但目前我国是全球新建筑数量最多的国家,再生混凝土成本低、需求量大,建筑方根据对普通混凝土的印象,直接将再生混凝土应用到建筑工程建设中,其中存在低温抗震性能不明确的问题。针对这个问题,提出再生混凝土的低温抗震性变化对比分析,通过再生混凝土的材料配比及实验搭建设计再生混凝土低温抗震结构模型。根据其指标对其低温抗冻性能、加速度变化、损伤指标、刚度稳定性、层位移变化等几个方面进行变化对比分析。对比实验结果表明:再生混凝土当含气量在逐渐降低时,其保温效果降低,强度在降低,抗冻性也在降低,耐久性和稳定性较差,并且在地震后楼层间的位移和加速度变化较大,不能保证楼层的稳定性;位移角无法降低到最小;随着位移和负载地震力不断增加,再生混凝土逐渐产生开裂变化,刚度减小速度较快,刚度退化程度较大,低温抗震性能较差。As a building material,the seismic performance of recycled aggregate concrete (RAC) at low temperature needs to be analyzed before use.At present,the cost of RAC is low,and the demand is large in China.However,seismic performance at low temperatures is uncertain if directly applying the RAC to construction engineering.In view of this problem,a comparative analysis of the seismic resistance of RAC at low temperatures was presented in this paper.The low temperature seismic structure model of RAC was designed through the material ratio of RAC and experimental construction.According to the indicators,low temperature frost resistance,acceleration change,damage index,stiffness stability,and layer displacement change were compared and analyzed.The results of the comparative experiments showed that:(1) with decreasing oxygen content,the heat conservation effect is reduced,and the strength and frost resistance of RAC are also reduced;thus,the durability and stability of RAC are poor,and the seismic behavior is poor;(2) after an earthquake,the displacement and acceleration between the floors vary greatly,so the stability of the floor cannot be guaranteed;and (3),as the displacement and seismic load increase,the RAC gradually undergoes cracking changes.The stiffness decreases rapidly,and the degree of stiffness degradation is large,indicating the low temperature seismic performance of RAC is poor.

关 键 词：再生混凝土 位移 刚度 抗冻性 抗震性 

分 类 号：TU528[建筑科学—建筑技术科学]