钢管混凝土柱巨型交叉节点受力性能研究
发布时间：2018-08-26 16:37
【摘要】：在一超高层结构工程中,外框架采用了焊接钢管混凝土边柱和夹角为12°的斜柱交叉形成高达6层且与6层楼面梁相接的巨型交叉节点,该节点构造复杂。节点边柱的轴向荷载不平衡在节点处产生剪力,同时,由于斜柱承受的轴向荷载巨大,该巨型节点受力复杂。为研究该节点的受力性能,对其进行了大比例模型加载试验。试验在最不利工况(1.2×重力荷载+1.3×设防地震作用)下:1)在设计荷载作用下节点试件整体仍然处于弹性工作状态;2)增大边柱不平衡力,对节点试件的平面内侧移有一定的影响,而对平面外变形基本没影响;3)对斜柱轴向荷载进行卸载,将节点由压剪转换至更不利的拉剪受力状态,节点未破坏;4)施加斜柱轴向荷载超过设计承载力的2倍,节点试件最终在斜柱两端出现局部鼓起而发生破坏,说明该交叉节点的设计符合我国规范"强节点弱构件"的设计原则。在整个加载过程中,节点区域并未产生剪切破坏面,钢管内部设置的纵向内隔板和加劲环板使得钢管与混凝土协同工作,节点构造合理。通过合理的简化,对该节点试件进行了三维非线性有限元分析,其荷载-变形曲线以及破坏模式与试验结果吻合良好。
[Abstract]:In a super high-rise structure engineering, the welded concrete filled steel tube side column and the oblique column with an angle of 12 掳are used to cross the outer frame to form a huge cross joint which is up to 6 stories and connected with a 6 floor beam. The structure of the joint is complex. The axial load unbalance of the nodal column produces shearing force at the joint. At the same time, because of the huge axial load on the inclined column, the force of the giant joint is complicated. In order to study the mechanical behavior of the joint, a large scale model loading test was carried out. Under the most unfavorable working conditions (1.2 脳 gravity load 1.3 脳 seismic fortification), the joint specimen is still in an elastic working state under the design load. (2) increasing the unbalance force of the edge column has a certain effect on the plane medial displacement of the joint specimen. However, the out-of-plane deformation has no effect on the axial load of the oblique column, and the joint is transformed from compression shear to more unfavorable tension and shear state. The joint does not destroy the axial load of the inclined column, and the axial load of the inclined column is more than 2 times of the designed bearing capacity. Finally, the joint specimen appears local bulge at the two ends of the inclined column, which shows that the design of the cross joint conforms to the design principle of "strong joint and weak member" in our code. In the whole loading process, there is no shear failure surface in the joint area. The longitudinal inner partition plate and stiffened ring plate set inside the steel tube make the steel tube and concrete work together, and the joint structure is reasonable. Through reasonable simplification, the three-dimensional nonlinear finite element analysis of the joint specimen is carried out. The load-deformation curve and failure mode are in good agreement with the experimental results.
【作者单位】： 同济大学土木工程防灾国家重点实验室;同济大学土木工程学院;华东建筑设计研究院有限公司;中国建筑第八工程局有限公司钢结构工程公司;
【基金】：国家科技支撑计划项目(2011BAJ09B01)
【分类号】：TU398.9
[Abstract]:In a super high-rise structure engineering, the welded concrete filled steel tube side column and the oblique column with an angle of 12 掳are used to cross the outer frame to form a huge cross joint which is up to 6 stories and connected with a 6 floor beam. The structure of the joint is complex. The axial load unbalance of the nodal column produces shearing force at the joint. At the same time, because of the huge axial load on the inclined column, the force of the giant joint is complicated. In order to study the mechanical behavior of the joint, a large scale model loading test was carried out. Under the most unfavorable working conditions (1.2 脳 gravity load 1.3 脳 seismic fortification), the joint specimen is still in an elastic working state under the design load. (2) increasing the unbalance force of the edge column has a certain effect on the plane medial displacement of the joint specimen. However, the out-of-plane deformation has no effect on the axial load of the oblique column, and the joint is transformed from compression shear to more unfavorable tension and shear state. The joint does not destroy the axial load of the inclined column, and the axial load of the inclined column is more than 2 times of the designed bearing capacity. Finally, the joint specimen appears local bulge at the two ends of the inclined column, which shows that the design of the cross joint conforms to the design principle of "strong joint and weak member" in our code. In the whole loading process, there is no shear failure surface in the joint area. The longitudinal inner partition plate and stiffened ring plate set inside the steel tube make the steel tube and concrete work together, and the joint structure is reasonable. Through reasonable simplification, the three-dimensional nonlinear finite element analysis of the joint specimen is carried out. The load-deformation curve and failure mode are in good agreement with the experimental results.
【作者单位】： 同济大学土木工程防灾国家重点实验室;同济大学土木工程学院;华东建筑设计研究院有限公司;中国建筑第八工程局有限公司钢结构工程公司;
【基金】：国家科技支撑计划项目(2011BAJ09B01)
【分类号】：TU398.9
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