新管幕肋梁结构节点抗剪性能试验  

Experimental Research on Joints of Ribbed Beam in New Tubular Roof Structure

作　　者：阎石[1,2] 张玲玲[1,3] 金春福[1,2] 王健[1] 

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168 [2]大连理工大学建设工程学部,辽宁大连116024 [3]沈阳建筑大学建筑设计研究院,辽宁沈阳110168

出　　处：《沈阳建筑大学学报（自然科学版）》2011年第4期702-707,共6页Journal of Shenyang Jianzhu University：Natural Science

基　　金：住房和城乡建设部研究开发项目(2010-K2-14);2009年度沈阳大型仪器设备共享服务专项基金项目(090079)

摘　　要：目的研究新管幕肋梁结构节点抗剪性能,揭示新管幕肋梁结构节点抗剪性能、破坏形态和机理.方法设计了肋梁偏移率分别为β=0和β=0.5的两组新管幕肋梁结构节点,对其进行抗剪性能静力试验,研究不同截面偏移率对抗剪性能的影响.结果构件的破坏形态为剪切破坏,两组节点试件的极限承载力分别为1 286 kN和1 138 kN.由于节点核心区混凝土的受力状态不同,导致节点承载力及挠度不同.结论截面偏移率增大能提高截面抗剪承载能力和变形能力,将钢管混凝土纵梁两侧边肋梁箍筋进行适当加密可以提高新管幕肋梁结构节点的抗剪承载力.The paper presents an experimental method for mechanical property research on joints of ribbed beam in new tubular roof（NTR）structure for underground Metro Station.The purpose of the research is to experimentally develop shear capacity of the joints in NTR structure,focusing on the shear capacity,failure modes and mechanism of the joints,and also on development of the bearing capacity and deformation ability by changing the shape of the joint.Behaviors and modality of two specimens were experimentally researched under static loading tests.In the tests,influencing factors such as the migration rate of cross-section,which influenced the strength and deformation properties of the joints,were experimentally examined.As the stress state of joint core concrete is different,the ultimate bearing capacity of joint which the migration rate of cross-section is 0 is 1 286 kN but the other is 1 138 kN which the migration rate of cross-section is 0.5.The experimental phenomenon and data analysis showed that both bearing capacity and deformation ductility of the joints were effectively increased by changing the migration rate of cross-section.The mechanism of the joints with typical shear failure was experimentally clarified and the main conclusions are that the migration rate of cross-section was one of the key factors influencing the stiffness and deformation capacity after failure,and the strength and quantity of the stirrup was also mainly influencing fact to the bearing capacity of the joint.

关 键 词：肋梁结构节点 抗剪性能 静力试验 截面偏移率 

分 类 号：TU352.1[建筑科学—结构工程]