圆钢管砖骨料地聚物再生混凝土柱滞回性能试验研究  

Experimental study on hysteretic behavior of brick aggregate geopolymer recycled concrete-filled circular steel tubular column

作　　者：蒋国平[1] 颜桂云 刘如月 刘宪成 张鹏起 JIANG Guoping;YAN Guiyun;LIU Ruyue;LIU Xiancheng;ZHANG Pengqi(School of Engineering,Fujian Jiangxia University,Fuzhou 350108,China;Fujian Provincial Key Laboratory of Advanced Technology and Informatization in Civil Engineering,School of Civil Engineering,Fujian University of Technology,Fuzhou 350118,China)

机构地区：[1]福建江夏学院工程学院,福建福州350108 [2]福建省土木工程新技术与信息化重点实验室,福建理工大学土木工程学院,福建福州350118

出　　处：《地震工程与工程振动》2024年第4期104-114,共11页Earthquake Engineering and Engineering Dynamics

基　　金：福建省科技厅高校产学合作项目(2021Y4018);福建省财政厅科技项目(GY-Z21005);福建省自然科学基金项目(2023J011112)。

摘　　要：为探究废弃黏土砖再利用的可行性,对6根圆钢管砖骨料地聚物再生混凝土柱的滞回性能进行了系列试验研究。以不同钢管厚度(4、6 mm)、砖骨料取代率(0%、50%、100%)、轴压比(0.05、0.25、0.50)为参数,得到了试件在往复荷载作下的失效模态、骨架曲线和滞回曲线,并对构件的刚度退化、滞回性能、峰值承载力、延性、承载力退化和耗能能力等抗震性能指标的变化规律分析。结果表明:试件的失效模式表现为底部发生鼓曲、开裂,出现塑性铰的区域核心混凝土破碎,与普通钢管混凝土相似;砖骨料取代率和轴压比的增加会降低试件的承载力,钢管厚度的增加会提高试件的承载力。试件的滞回曲线饱满,表现出不明显的捏缩,表明耗能能力较好;轴压比的增加导致试件的变形能力降低,加快了刚度和承载力的退化速度,增长钢管厚度可以提高试件的变形能力;砖骨料取代率对试件刚度退化、延性、承载能力和耗能能力的影响有限。In order to explore the feasibility of reuse of waste clay bricks,a series of experimental studies were conducted on hysteretic behavior of 6 brick aggregate geopolymer recycled concrete-filled circular steel tubular(BAGRC-FST)columns.Key parameters including steel tube thickness(4 mm and 6 mm),replacement ratio of brick aggregate(0%,50%,100%)and axial compression ratio(0.05,0.25 and 0.50)were considered.The failure mode,skeleton curves and hysteretic curves of the specimens under reciprocating load were obtained,and the change law of seismic performance indicators such as stiffness degradation,hysteresis behavior,peak bearing capacity,ductility,bearing capacity degradation and energy-dissipation capacity of the components were analyzed.The results indicated that the failure mode of the specimen is characterized by bulging and cracking at the bottom of specimens and the breakage of the core concrete in the area where plastic hinges appear,which is similar to that of ordinary CFST columns.The increase of brick aggregate replacement ratio of brick aggregate and axial compression ratio reduces the bearing capacity of specimens,and the increase of steel tube thickness will increase the bearing capacity of specimens.The hysteretic curves of specimens were plump without obvious pinching effect,implying that the BAGRC-FST columns had desired energy-dissipation capacity.Moreover,increasing the axial compression ratio reduces the deformation capacity of specimens and accelerates the degradation of stiffness and bearing capacity.However,increasing the thickness of the steel tube can improve the deformation ability of specimens.The substitution rate of brick aggregate has limited influence on stiffness degradation,ductility,bearing capacity and energy dissipation capacity of the BAGRC-FST columns.

关 键 词：砖骨料 地聚物再生混凝土 圆钢管混凝土柱 砖骨料取代率 滞回性能 

分 类 号：TU398.9[建筑科学—结构工程] TU528.59