高层钢结构交错桁架结构的试验研究  

Experimental study on high-rise staggered truss steel structure

作　　者：周绪红[1] 莫涛[2] 刘永健[3] 尹志明[2] 卢林枫[3] 周期石[4] 

机构地区：[1]兰州大学,甘肃兰州730000 [2]湖南大学,湖南长沙410082 [3]长安大学,陕西西安710064 [4]中南大学,湖南长沙410083

出　　处：《建筑结构学报》2006年第5期86-92,共7页Journal of Building Structures

基　　金：国家自然科学基金资助项目(50078021);教育部科学技术研究重点资助项目(99089);高等学校博士学科点专项科研基金资助项目(2000053203)

摘　　要：进行了1个14层交错桁架结构1:8缩尺模型静力弹性试验。试验研究包括交错桁架结构在弹性阶段的受力机理,柱子内力状态,桁架腹杆内力分布规律,楼板应力分布情况,结构层间位移和结构扭转角。试验按竖向荷载+水平3点加载和竖向荷载+水平单点加载两种工况加载,分别考察相邻框架的协同工作性能和结构扭转性能。由于受实验室净高的限制,竖向荷载采用楼面堆载和柱中加套拉杆的方式加载。测试结果表明,柱子的内力以轴力为主,柱子可以按轴心受力构件设计;桁架各种腹杆也完全可以认为是轴心受力构件。应变测点显示出,上下两层相邻的楼板中水平剪力的传递方向是相反的,相邻两框架间水平剪力的传递是通过楼板中的带状拉力场得以实现。位移测试结果说明,交错桁架是一种侧移刚度较大,但抗扭转刚度较小的结构体系。利用开发的有限元程序对试验过程进行对比计算。有限元分析结果与试验值接近,表明本文有限元理论分析方法是正确、可靠的。最后,对楼板的极限剪力问题作了探讨。The paper deals with the research of the static elastic experiment of a 14-story staggered truss model made in 1：8 scale. The tests are made to evaluate the loading mechanism of the staggered truss structure under loads in static stage, and the internal force behavior of column, the regulation of the internal force distribution in the truss web, the distribution of stress in the floor, the relative story drift and structural torsion angle. Two kinds of loads, one of which is vertical load adds three points horizontal loading, and the other is vertical load adds one point horizontal loading, are used in this experiment to study the behavior about cooperative work between neighboring truss frame and structural torsion. Limited by net height of the laboratory, the vertical loads are loaded by the floor heaps and adding the tension rod in the columns. The result of the test indicates that the axial force is the major internal force in the columns and truss webs. The strain measurement shows that the direction of transfer of shear forces is opposite to neighboring floor, and the lateral shear force between neighboring frame is transferred by the tension strap zone in the floor. The lateral drift measurement shows that the staggered truss is a structure with a larger lateral stiffness and a smaller torsional rigidity. The finite-element program is adopted to compare the experiment results. The analytic results of the finite-element program are close to the values of experiment, which indicates that the theoretic analysis method in this paper is correct and reliable. Finally, the ultimate shear force of the floor is discussed in the paper.

关 键 词：交错桁架 荷载试验 位移 内力 

分 类 号：TU973.13[建筑科学—结构工程] TU317.1