摘要
“双碳”背景下,为加快推进绿色低碳建造和提升固废利用水平,提出了一种保温承重一体化固废泡沫混凝土复合墙体。为研究该墙体的抗震性能,设计制作了9个不同参数的墙体试件进行低周反复荷载试验,设计变量包括墙体端部是否配置冷弯薄壁型钢、冷弯薄壁型钢厚度(1、2 mm)和轴压比(0.1、0.2、0.3),分析低周反复荷载作用下墙体试件的破坏特征和裂缝扩展规律,对比分析不同墙体试件的承载力及变形性能、刚度退化和耗能能力。试验结果表明:低周反复荷载作用下,墙体试件均发生剪切破坏,且主裂缝均沿45°方向扩展;端部配置冷弯薄壁型钢,能够有效约束泡沫混凝土开裂并提高变形协调性能,显著提高墙体的受剪承载力;在轴压比0.1~0.3的范围内,随着轴压比增大,墙体的初始刚度和受剪承载力提高,但变形及耗能能力显著降低,抗震性能下降。采用ABAQUS有限元软件进行参数分析,变量包括固废泡沫混凝土密度(600、800 kg/m^(2))和轴压比(0.1、0.2、0.3)。分析结果表明:随固废泡沫混凝土密度增大,墙体受剪承载力有效提高,耗能能力有所削弱,墙体在中下部的损伤更为集中,剪切破坏模式未有变化;随轴压比增大,墙体受剪承载力提高,耗能能力降低,抗震性能减弱。
In the context of the"dual carbon"initiative,to advance green construction and solid waste utilization,a composite wall system integrating thermal-insulation and load-bearing functions using solid waste foamed concrete was proposed.To investigate the seismic performance of this wall system,nine wall specimens with different parameters were fabricated and subjected to low-cycle reversed loading tests.The design variables included:the presence of cold-formed thin-walled shaped steel,the thickness of the cold-formed thin-walled shaped steel(1 mm,2 mm),and the axial compression ratio(0.1,0.2,0.3).The study analyzed the failure characteristics and crack propagation patterns of the wall specimens under low-cycle reversed loading,and compared the load-bearing capacity,deformation performance,stiffness degradation,and energy dissipation capacity of different wall specimens.Experimental results show that under low-cycle reversed loading,all wall specimens experience shear failure,with the primary cracks propagating at±45°direction.The use of cold-formed thin-walled shapedsteel at the ends effectively restrains cracking in the foamed concrete,thereby improving deformation coordination performance and significantly enhancing the shear bearing capacity of the walls.As the axial compression ratio increases from O.1to 0.3,the initial stiffness and shear capacity of the wall specimens increase,but the deformation and energy dissipation capacities decrease sharply,leading to significantly reduced seismic resilience.Parametric studies were conducted using ABAQUS finite element software,considering the following variables:solid waste foamed concrete density(600 kg/m,800 kg/m)and axial compression ratio(0.1,0.2,0.3).The simulation results indicate that the increases in both the density of solid waste foamed concrete and axial compression ratio enhance the shear bearing capacity of the wall,at the cost of reduced energy dissipation capacity.The failure mode consistently features shear failure,with the damage concentrating in the middle and lower regions of the wall.
作者
孙浩
郝贠洪
秦立达
王洪泽
陈超
魏迪
SUN Hao;HAO Yunhong;QIN Lida;WANG Hongze;CHEN Chao;WEI Di(Inner Mongolia University of Technology,Hohhot O10051,China;The Inner Mongolia Autonomous Region Construction Inspection and Appraisal and Safety Assessment Engineering Technology Research Center,Hohhot O10051,China;Key Laboratory of Green Construction and Intelligent Operation and Maintenance ofCivil Engineering in Inner Mongolia Autonomous Region,Hohhot O10051,China;Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150090,China;Inner Mongolia University of Technology Architectural Design Co.,Ltd,Hohhot O10010,China;China Construction Eighth Engineering Bureau Co.,Ltd,Shanghai 200112,China)
出处
《建筑结构学报》
北大核心
2025年第11期144-159,共16页
Journal of Building Structures
基金
内蒙古自治区科技计划项目(2020GG0014)
中央引导地方科技发展资金项目(2022ZY0189)
国家自然科学基金面上项目(12272190)。
关键词
固废泡沫混凝土复合墙体
保温承重一体化
拟静力试验
有限元分析
抗震性能
solid waste foamed concrete composite wall
integration of heat preservation and load bearing
quasistatic test
finit element analysis
seismic performance
