RC环梁节点—圆钢管混凝土柱有限元分析及优化设计

发布时间：2018-11-26 08:21

【摘要】：伴随着中国经济的快速发展，，人口日益增长，可用规划土地的减少，越来越多的超高层建筑被各个地区广泛的需求。钢管混凝土柱因为其优异的抗压受力性能、较好的延性以及良好的经济效益，已经越来越多的用于各类高层建筑。在工程实践中，由于存在多根RC梁与单根STCC柱在一个高度内相交的问题，使得RC梁与STCC柱在连接方法上不断的创新和改善，在诸多的连接方式中，因为钢筋混凝土环梁节点简便的施工程序和良好的受力性能，使其应用最为广泛。本文以重庆市江北区某超高层建筑工程实例为背景对环梁节点进行探讨，该工程为民用建筑，地下结构为7层，地面以上3层为裙房，上部为单塔结构，该单塔结构高度约280米，属于超高层建筑的范畴，该工程采用钢管混凝土柱与钢筋混凝土剪力墙作为竖向承载构件，钢筋混凝土梁、楼板构成水平承载构件。在底部裙房区域，存在4根RC梁与1根STCC柱在同一高度相交的情况，连接方式采用钢筋混凝土环梁节点，通过有限元软件ABAQUS对该RC梁—STCC柱环梁节点进行了实体有限元模拟及分析，对比了在不同的环筋配筋值下以及设置斜向拉筋和附加箍筋后节点的受力情况，并得出一些有意义的结论。本文主要完成的工作包括： ①结合重庆市某超高层建筑实际的设计及施工情况，介绍了钢筋混凝土环梁的研究现状及实际工程中应用的情况。 ②介绍了有限元模型和计算方法，对该超高层建筑底部裙房区域的钢筋混凝土环梁节点进行了ABAQUS有限元模型模拟 ③分析了环梁节点在单调加载后各部分钢筋的应力变化，对比了环梁节点在不同环筋配筋下单调加载后，各部位钢筋的应力差异及P-△曲线。 ④对比了环梁节点在不同环筋配筋下，往复荷载加载后，环梁节点的滞回性能以及钢筋屈服区域的分布情况。 ⑤对环梁节点进行两种优化方案设计，通过有限元分析，对比了优化后节点在单调加载下的应力发展、P-△曲线以及在往复荷载下的滞回曲线和环梁钢筋屈服区域的分布情况。
[Abstract]:With the rapid development of Chinese economy, the increasing population and the decrease of available planning land, more and more super-tall buildings are widely needed in various regions. Concrete-filled steel tubular columns have been used in various high-rise buildings more and more because of their excellent compressive performance, good ductility and good economic benefits. In engineering practice, because of the problem of multiple RC beams intersecting with a single STCC column in a single height, the connection method between RC beam and STCC column has been innovated and improved continuously. Because of the simple construction procedure and good mechanical performance, the reinforced concrete ring beam joints are most widely used. Based on the example of a super high-rise building project in Jiangbei District, Chongqing City, this paper discusses the ring beam joint. The project is a civil building, the underground structure is 7 stories, the three floors above the ground are a skirt, and the upper part is a single tower structure. The structure of the single tower is about 280 meters high, which belongs to the category of super high-rise building. The concrete filled steel tube column and reinforced concrete shear wall are used as vertical bearing members, and the reinforced concrete beams and slabs are used as horizontal load-bearing members. In the bottom skirt area, there are four RC beams intersecting with one STCC column at the same height. The finite element simulation and analysis of the RC beam-STCC column ring beam joints are carried out by finite element software ABAQUS, and the stress conditions of the joints under different reinforcement values and with oblique tension bars and additional stirrups are compared. And draw some meaningful conclusions. The main work accomplished in this paper is as follows: 1 according to the actual design and construction of a super high-rise building in Chongqing, the research status of reinforced concrete ring beam and its application in practical engineering are introduced. 2. The finite element model and calculation method are introduced. The ABAQUS finite element model is used to simulate the reinforced concrete ring beam joints at the bottom of the building. 3 the stress changes of each part of the ring beam joints after monotonic loading are analyzed. The stress difference and P- curve of the ring beam joints under the monotonic loading of different ring reinforcement were compared. (4) the hysteretic behavior of ring beam joints and the distribution of the yield region of the steel bars are compared after the cyclic loads are applied to the ring beam joints under different reinforcement. 5. Two optimization schemes are designed for the ring beam joints. The stress development of the optimized joints under monotone loading is compared by finite element analysis. P-curve, hysteretic curve under reciprocating load and distribution of yield region of steel bar in annular beam.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU398.9

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