双锥型压弯(扭)圆钢管的试验研究  

Experimental investigation of circular steel tubes with tapered ends subjected to bending,compression and torsion

作　　者：罗尧治[1] 季伟捷[1] 沈雁彬[1] 傅学怡 顾磊 

机构地区：[1]浙江大学空间结构研究中心,浙江杭州310027 [2]中建国家游泳中心设计联合体,北京100029

出　　处：《建筑结构学报》2005年第6期79-85,共7页Journal of Building Structures

基　　金：国家科技攻关计划课题(2004BA904B02);北京市科技计划项目(Z000402804221)

摘　　要：双锥型变截面类构件在压弯(扭)复合荷载作用下,受力情况复杂,目前规范尚未给出一套完整的强度、稳定计算公式。本文通过双锥型圆钢管的压弯(扭)载荷试验,对该类型构件在复合荷载作用下的承载能力、破坏模态、位移-荷载曲线及应变-荷载曲线进行了分析比较。试验分析表明:试件的破坏模态表现为结构的局部屈曲,提供一个较小的坡度,便能使塑性区发生内移,以获得更大的延性;双锥型构件比等截面构件具备更好的受力性能,其承载能力的提高与锥体坡度直接相关,对于塑性铰位于交界面处的构件,其承载能力的提高可达40%左右。The formulas for computing load-bearing capacity and buckling strength of circular steel tube with tapered ends and subjected to bending, axial compression and torsion are not available in current codes. An experimental investigation was carried out on such steel tube columns to analyze their load-carrying capacity, failure patterns, load-displacement curves and load-strain curves. The experimental results indicated that the failure patterns of specimens are all local buckling. The position of buckling will be changed toward inside in case a small gradient is offered, the tubes will thus gain better ductility. The members with tapered ends have better load-carrying capacity than those with the uniform cross-section. The enhancement of load-carrying capacity is directly affected by gradient of the cone, it could reach as high as 40% when the plastic hinge occurred at the interface between the cone and the middle tube.

关 键 词：双锥型圆钢管 变截面 试验研究 

分 类 号：TU392.3[建筑科学—结构工程] TU317.1