冷弯薄壁钢管-稻草板组合墙体抗剪性能试验  

Experimental on Shear Performance of Cold-formed Thin-walled Steel Tube-Straw Board Composite Walls

作　　者：张秀华[1] 陆希林 屈东磊 ZHANG Xiuhua;LU Xilin;QU Donglei(School of Civil Engineering,Northeast Forestry University,Harbin,China,150040;The Fourth Construction Engineering Co.Ltd.,China Construction Second Engineering Bureall,Tianjin,China,300457)

机构地区：[1]东北林业大学土木工程学院,黑龙江哈尔滨150040 [2]中建二局第四建筑工程有限公司,天津300457

出　　处：《沈阳建筑大学学报（自然科学版）》2022年第5期795-803,共9页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(51878130)。

摘　　要：目的 研究冷弯薄壁钢管-稻草板组合墙体的抗剪性能,为该类墙体在实际工程中的应用提供理论依据。方法 组合墙体由钢骨架和稻草板通过ST4.8×85 mm的外六角自攻螺钉连接而成,其中钢骨架由钢管和U型导轨通过ST3.5×16 mm的梅花沉头自攻螺钉连接。对3面组合墙体进行水平单调加载试验,分析各试件的破坏过程和破坏机理,得到组合墙体的屈服荷载、延性系数和抗侧刚度等抗剪性能指标。结果 组合墙体主要的破坏模式为受压侧钢管底部局部屈曲,稻草板表面出现斜向褶皱;无竖向荷载的组合墙体比竖向荷载为15 kN和30 kN的组合墙体在屈服荷载上分别提高了8.11%和14.87%,在抗侧刚度上降低了32.86%和70.18%。结论 稻草板对钢骨架起到了良好的约束作用,组合墙体整体性良好且具有较高的抗剪承载力。组合墙体的抗剪承载力随着上部竖向荷载的增加而逐渐降低,但同时提高了组合墙体的延性系数和抗侧刚度,增加了墙体的稳定性。In order to observe the shear properties of the cold-formed thin-walled steel tube-straw board composite walls and provide theoretical basis for the application of this kind of wall in practical engineering,a monotonic shear performance test was carried out on 3 composite wall specimens.The composite wall is composed of steel frame and straw board connected by ST4.8×85 mm external hexagonal tapping screws and the steel frame is composed of steel tube and the U guide rail connected by ST3.5×16 mm countersunk head tapping screws.The failure processes and failure mechanism of each specimen were analyzed.The performance indexes such as yield load,ductility coefficient and lateral stiffness of the composite wall were received.The consequences demonstrate that the main failure mode was local buckling of steel tube ends on compression side and the oblique wrinkling of straw boards surface.No vertical load composite wall than the composite wall of vertical load of 15 kN and 30 kN on the yield load respectively increased by 8.11% and 14.87%,on the lateral stiffness was respectively reduced by 32.86% and 70.18%.The straw board plays a good role in restraining the steel frame,so that the composite walls have good integrity and higher shear bearing capacity.With the increase of the upper vertical load on the composite wall,its shear bearing capacity decreases gradually,the ductility coefficient and lateral stiffness of the composite walls are improved at the same time,the stability of the composite wall is enhanced.

关 键 词：冷弯薄壁钢管 稻草板 组合墙体 抗剪承载力 

分 类 号：TU392.1[建筑科学—结构工程]