竖向荷载作用下带纵向加强肋复合墙体受力性能研究  

Study on mechanical performance of composite wall with longitudinal reinforcing rib under vertical loads

作　　者：陈国新[1] 王利 胡玉龙[1] 席亮[1] CHEN Guoxin;WANG Li;HU Yulong;XI Liang(College of Water Conservancy and Civil Engineering,Xinjiang Agricultural University,Urumqi 830052,China)

机构地区：[1]新疆农业大学水利与土木工程学院,乌鲁木齐830052

出　　处：《建筑结构》2021年第6期99-104,共6页Building Structure

基　　金：新疆维吾尔自治区自然科学基金(2016D01A045)。

摘　　要：为研究带纵向加强肋复合墙体在竖向荷载作用下的力学性能,设计并制作一榀1/2缩尺比例模型墙体进行竖向均布荷载作用下的试验研究,探析复合墙体的破坏过程及墙体内钢筋应变在加载过程中的变化规律。采用ABAQUS软件建立不同工况下墙体的数值模型进行数值计算,分析影响墙体竖向承载力的主要因素。结果表明:复合墙体在竖向均布荷载作用下经历了弹性阶段、弹塑性阶段和破坏阶段;墙体破坏由上层角部砌块压碎剥落开始,最终由于框柱柱脚混凝土压碎、钢筋外鼓而失效;试验墙体的屈服荷载为250kN,破坏时极限荷载为300kN;墙体受力过程中,底部肋梁受压,上部肋梁受拉,中部肋梁钢筋应变在0~50με之间;框柱混凝土强度对墙体竖向承载力影响最大,肋梁配筋率对墙体竖向承载力影响程度最小。For the purpose of exploring the mechanical properties of composite wall with longitudinal reinforcing rib under the vertical loads,a 1/2 reduced scale model wall was designed and made to conduct an experimental study under the action of vertical uniform loads in order to analyze the failure process of the composite wall and the change law of the strain of the steel bar in the wall during the loading process.ABAQUS software was used to establish numerical models of the wall under different working conditions for numerical calculation,and the main factors affecting the vertical bearing capacity of the wall were analyzed.The results show that the composite wall has undergone an elastic stage,an elastoplastic stage and a failure stage under the action of the vertical uniform load;the wall failure starts from the crushing and peeling of the upper corner blocks,and finally the wall fails due to the concrete crushing of the outer frame column foot and the externally bulged steel bar;the yield load of the test wall is 250 kN,and the ultimate load at failure is 300 kN;during the experimental process of the wall,the bottom rib beam is compressed,the upper rib beam is tensioned,and the steel bar strain of the middle rib beam is between 0~50με;the concrete strength of the outer frame column has the greatest influence on the vertical bearing capacity of the wall,and the rib beam reinforcement ratio has the smallest influence on the vertical bearing capacity of the wall.

关 键 词：复合墙体 纵向加强肋 肋梁 钢筋应变 承载力 

分 类 号：TU317.2[建筑科学—结构工程]