装配式冷弯薄壁型钢-轻质混凝土组合剪力墙抗震性能研究  

tudy on seismic behavior of assembled lightweight concrete-filled cold-formed thin-walled steel composite shear walls

作　　者：徐志峰 陈海涛[1] 王来 陈忠范 周世栋[1] XU Zhifeng;CHEN Haitao;WANG Lai;CHEN Zhongfan;ZHOU Shidong(College of Civil Engineering and Architecture,Shandong University of Science and Technology,Qingdao 266590,China;School of Civil Engineering,Southeast University,Nanjing 211189,China;Key Laboratory of Concrete and Pre-stressed Concrete Structures of the Ministry of Education,Southeast University,Nanjing 211189,China)

机构地区：[1]山东科技大学土木工程与建筑学院,山东青岛266590 [2]东南大学土木工程学院,江苏南京211189 [3]东南大学混凝土及预应力混凝土教育部重点实验室,江苏南京211189

出　　处：《建筑结构学报》2023年第12期46-58,共13页Journal of Building Structures

基　　金：国家自然科学基金项目(51908341);国家自然科学基金面上项目(52078120);山东省高等学校青创人才引育计划项目(海洋土木工程材料与结构创新研究团队)。

摘　　要：为了进一步提升填充泡沫混凝土-冷弯薄壁型钢组合墙体的抗震性能,提出了一种装配式冷弯薄壁型钢-轻质混凝土组合剪力墙,由内填充自密实轻质混凝土的矩形冷弯型钢端立柱、高强泡沫混凝土填充冷弯型钢墙单元、双层墙面板等组成。通过4片冷弯薄壁型钢-轻质混凝土剪力墙足尺试件的低周反复加载试验,研究了增强端立柱、双拼内立柱和立柱开孔数量对剪力墙破坏模式、承载力与抗侧刚度、变形与延性、刚度与承载力退化、耗能能力等抗震性能的影响。试验结果表明:剪力墙破坏模式呈现墙面板与泡沫混凝土交叉裂缝的剪切破坏特征,其弹塑性阶段的侧向变形为剪切型变形,峰值阶段时位移角为1/62~1/45;采用内填自密实混凝土的矩形端立柱和内立柱能抑制墙体立柱局部屈曲破坏,并显著提高墙体承载力和刚度;增加立柱腹板开孔数量能避免立柱与混凝土间的界面黏结滑移,提高了墙体承载力、刚度和耗能能力,并延缓了承载力与刚度退化。基于承载力叠加原理,提出了该类剪力墙的受剪承载力计算公式,计算结果与试验结果符合较好。To enhance the seismic performance of cold-formed thin-walled steel(CTS)composite wall filled with foam concrete,a novel type of lightweight concrete-filled CTS shear wall is proposed in this paper.The wall comprises rectangular CTS end studs filled with self-compacting lightweight concrete(SLC),high-strength foam concrete-filled CTS inner walls,and double-layer wall panels.Four full-scale specimens of lightweight concrete-filled CTS shear wall were subjected to reversed cyclic load.The influences of reinforced end stud,double interior stud and stud web openings on the seismic behavior such as failure mode,bearing capacity,lateral stiffness,deformation,ductility,stiffness and bearing capacity degradation,energy dissipation capacity,were investigated.The experimental results reveal that the specimens exhibit the shear failure characteristics,with oblique cracks observed in the wallboards and foam concrete.The lateral deformation during the elasto-plastic stage shows shear deformation,with the displacement angle ranging from 1/62 to 1/45 at peak load.Moreover,the adaptation of rectangular end stud and interior stud filled with SLC effectively prevents the local buckling failure,and significantly improves the shear bearing capacity and lateral stiffness of the walls.Additionally,increasing the number of openings in the stud webs prevents bond slip between studs and concrete core,leading to a noticeable enhancement in shear strength,lateral stiffness and energy dissipation capacity of the walls.It also delays the degradation of strength and stiffness.Based on the bearing capacity superposition principle,a shear bearing capacity calculation formula for this type shear wall was proposed,and the calculation results demonstrated good agreement with the test results.

关 键 词：冷弯薄壁型钢剪力墙 轻质混凝土 拟静力试验 抗震性能 受剪承载力 

分 类 号：TU398.9[建筑科学—结构工程] TU317.1