五边形截面钢管混凝土巨型柱受压性能试验研究

发布时间：2018-02-05 00:40

本文关键词： 钢管混凝土巨型柱五边形截面截面构造静力试验受压性能　出处：《建筑结构学报》2014年01期 　论文类型：期刊论文

【摘要】：为研究某超高层结构中五边形截面钢管混凝土巨型柱的受压性能,设计了6个1/5缩尺的柱模型试件,试件分为钢管内不分腔体仅配钢筋、钢管内分腔体不配钢筋、钢管内分腔体配置钢筋、钢管内分腔体配置钢筋且分腔隔板及竖向肋板在柱中部断开4种类型,对试件进行轴压和偏压试验。为研究试件刚度随加载循环次数的退化,采用单向重复荷载加载,对比研究了各试件的承载力、刚度及退化过程、破坏特征和平截面假定的适用性。试验表明:五边形截面钢管混凝土柱,钢管内不分腔体仅配钢筋的试件承载力较差;钢管内分腔体不配钢筋的试件与配钢筋的试件相比,虽承载力相差不大,但后期承载力下降较快;偏压试件与等截面轴压试件相比,承载力相对小,刚度退化速度较慢;腔体的分腔隔板及竖向肋板若在中部断开,造成刚度突变;腔体内设置竖向和水平肋板,对提高外壁钢板的稳定性有明显的作用;截面变形基本符合平截面假定。
[Abstract]:In order to study the compression behavior of a pentagonal section concrete filled steel tubular giant column in a super tall structure, six model specimens with 1/5 scale are designed. The specimens are divided into steel tubes with no cavities and only steel bars. There are four types of steel bar in the steel tube, the steel bar in the steel tube, the steel bar in the steel tube and the partition plate and vertical ribbed plate in the middle of the column. In order to study the degradation of specimen stiffness with cyclic loading, unidirectional repeated loading was used to study the bearing capacity, stiffness and degradation process of each specimen. The test results show that the load-carrying capacity of concrete filled steel tubular column with pentagonal section is poor when the steel tube is filled with only steel bars without any cavity. Compared with the specimen with steel bar, the bearing capacity of the steel tube with unreinforced cavity is not different from that of the steel tube, but the bearing capacity of the steel pipe decreases rapidly in the later stage. Compared with the axial compression specimen with constant cross section, the bearing capacity of the eccentric compression specimen is relatively small, and the stiffness degradation rate is slower than that of the same section axial compression specimen. If the split cavity partition plate and vertical rib plate of the cavity are disconnected in the middle part, the stiffness changes; Vertical and horizontal ribbed plates are arranged in the cavity, which can improve the stability of the outer wall steel plate. The deformation of the section basically accords with the assumption of the plane section.
【作者单位】：大连市建筑设计研究院有限公司;北京工业大学建筑工程学院;
【基金】：国家自然科学基金项目(51178010) 北京市教委科技创新平台项目(PXM2011-014024-09-000090,PXM2011-014024-09-000127)
【分类号】：TU398.9;TU317
【正文快照】： 0引言异形钢管混凝土柱在超高层结构中应用广泛,如天津117大厦、大连国贸中心大厦结构中均采用了多边形多腔钢管混凝土柱。目前,国内对异形钢管柱研究较多,如文献[1]对组合T形截面钢管混凝土柱进行偏心受压试验研究,分析长细比、偏心距等参数对承载力影响,结果表明:偏心受压

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