预应力桁架式钢骨混凝土梁抗剪承载力试验研究  

EXPERIMENTAL RESEARCH ON SHEAR CAPACITY OF PRESTRESSED TRUSS-TYPE STEEL-REINFORCED CONCRETE BEAMS

作　　者：刘嘉琪 曹大富[1] 王琨[1,2] 周雁玲 董政 LIU Jiaqi;CAO Dafu;WANG Kun;ZHOU Yanling;DONG Zheng(College of Civil Science and Engineering,Yangzhou University,Yangzhou 225127,China;Jiangsu Hanjian Group Co.,Ltd.,Yangzhou 225127,China)

机构地区：[1]扬州大学建筑科学与工程学院,江苏扬州225127 [2]江苏邗建集团有限公司,江苏扬州225127

出　　处：《工业建筑》2021年第10期14-20,共7页Industrial Construction

基　　金：国家自然科学基金项目(51878589,51578478);江苏省人力资源和社会保障厅“六大人才高峰”资助项目(2017-JZ-038);2019年江苏省“双创计划”资助项目;扬州市科技局科技计划资助项目(YZ2018068);2019年扬州市“绿杨金凤”资助项目;2016年扬州大学优秀青年骨干教师资助项目。

摘　　要：为研究预应力、剪跨比及竖腹杆间距对新型预应力桁架式钢骨混凝土梁抗剪性能的影响,设计制作了5根预应力桁架式钢骨混凝土混凝土梁和1根非预应力桁架式钢骨混凝土梁进行静力抗剪性能试验,研究试件的开裂荷载、极限荷载及挠度变形等。试验结果表明:预应力的施加以及竖腹杆间距的减小提高了试件的抗剪承载力并且有效限制了裂缝的产生与发展,但随着剪跨比的增大试件的抗剪承载力降低。基于抗剪破坏机理以及试验数据,提出了预应力桁架式钢骨混凝土梁的抗剪承载力计算式,以供工程设计参考。In order to study the influence of prestress,shear-span ratio and vertical girder spacing on the shear properties of new type prestressed trussed steel-reinforced concrete beams,in this paper,five prestressed trussed steel reinforced concrete beams and one non-prestressed trussed steel reinforced concrete beam were designed and fabricated for the static shear test. The cracking load,ultimate load and deflection deformation of specimens were studied. The experimental results showed that the application of pre-stress and the reduction of the distance between vertical webs improved the shear capacity of members and effectively limited the generation and development of cracks,while the shear capacity of members decreased with the increase of the shear-span ratio. Based on the shear failure mechanism and experimental data,the shear bearing capacity formula of prestressed trussed steel-reinforced concrete beams was presented for engineering design reference.

关 键 词：预应力混凝土 桁架式 抗剪承载力 试验研究 

分 类 号：TU398.9[建筑科学—结构工程]