分散筒结构墙梁节点局部增强构造措施研究

发布时间：2018-01-11 10:03

本文关键词：分散筒结构墙梁节点局部增强构造措施研究　出处：《中国海洋大学》2015年硕士论文　论文类型：学位论文

【摘要】：分散筒结构体系是一种适用于高层建筑的新型结构体系。该结构将尺寸较小的筒体作为承重构件分散布置于结构的四周,再通过框架梁等连接构件将各个筒体连接起来形成一个整体,共同提供抗侧力。分散筒结构体系具有空间布置灵活、面积利用率高、抗侧刚度竖向分布均匀等特点。该结构适应于现代高层结构的发展趋势。本文在已有的研究成果的基础之上,针对已研究构造措施的外形缺陷,即各措施均在结构内部形成凸起,对内部空间的使用功能、美观以及安全造成了一定的影响。本文以此为切入点对不影响内部空间的构造措施进行了较为深入地探索。本文首先应用PKPM软件对优化后的分散筒结构进行内力分析,从整体结构中截取受力较为复杂的项层梁板墙节点与电梯井转角节点进行局部加固,再应用ANSYS有限元分析软件对加固后的节点进行数值模拟分析,对各不同措施下的分析结果进行对比,得出相关结论与实际工程使用建议。本文首先分别对进行过优化后的顶层梁板墙节点与顶层电梯井转角处节点进行数值模拟分析。顶层梁板墙节点墙体的平面外受弯严重,墙体裂缝宽度有贯穿墙体的趋势。顶层电梯井转角节点梁两侧受力钢筋应力有很大差异,转角处墙体出现应力集中,混凝土在局部压碎,受力情况薄弱。针对顶层梁板墙节点存在的上述问题,本文采取了墙内局部增加槽钢、墙内局部增加钢板、墙内局部纵向钢筋加密三种加强措施,每种措施采用多种钢材规格、多种布置方式进行组合,形成大量布置方案,对各节点方案进行数值模拟分析。对大量分析结果进行对比研究得出,在节点墙内设置槽钢与钢板能够会使节点的变形以及裂缝情况有所改善,但过度的钢材会产生较大的刚度导致墙体内发生应力集中,产生新的受力问题,所以在采用以上两种措施时需要具体问题具体分析,对具体结构进行详细计算后确定钢材的规格与布置方式。墙内局部钢筋加密的方法能够更好的解决墙体的开裂问题,并且施工工艺更加简便,具有工程实际意义。针对顶层电梯井转角处节点存在的问题,同样采取墙内增加钢板、墙内局部纵向钢筋加密、墙内增加槽钢三种加固措施对节点进行加强。对三种措施下多种方案进行数值模拟,对结果进行分析可以得出增设钢板、局部钢筋加密对节点的受力情况基本没有起到改善作用,并且钢板会致使墙体内出现严重的应力集中。墙内增设槽钢对节点的变形有一定的改善,但未能解决梁受力筋受力不平衡的问题。可以得出,对于此处节点的受力问题需要寻求其他的解决方法。
[Abstract]:The dispersed tube structure system is a new type of structure system suitable for high-rise buildings. The structure distributes the smaller cylinder body as a load-bearing member around the structure. Then through the frame beam and other connecting members each cylinder body is connected to form a whole together to provide side force. The dispersed tube structure system has flexible space arrangement and high area utilization ratio. The vertical distribution of lateral stiffness is uniform. The structure adapts to the development trend of modern high-rise structures. Based on the existing research results, this paper aims at the shape defects of the structural measures studied. That is, all measures in the structure of the formation of protruding, the use of internal space function. Aesthetics and safety have a certain impact. This paper takes this as a starting point to explore the construction measures that do not affect the internal space. Firstly, this paper applies PKPM software to optimize the structure of the dispersed tube. Internal force analysis. From the whole structure, the joints of beam, slab and wall with complicated force are partially strengthened with the corner node of elevator shaft, and then the ANSYS finite element analysis software is used to simulate the strengthened joints. The analysis results under different measures are compared. The conclusions and practical engineering suggestions are obtained. Firstly, numerical simulation analysis of the joints of the top floor beam, slab wall and the top elevator shaft corner after optimization is carried out respectively. Out of plane of the top floor beam, plate wall joint and wall. Severely bent. The crack width of the wall has a tendency to run through the wall. The stress of reinforcing bar on both sides of the corner joint beam of the top elevator shaft is very different. The stress concentration of the wall appears at the corner and the concrete is crushed locally. In view of the above problems existing in the joints of the top beam, slab and wall, three kinds of strengthening measures are adopted in this paper, namely, the local increase of channel steel in the wall, the partial increase of the steel plate in the wall, and the reinforcement of the local longitudinal reinforcement in the wall. Each measure uses a variety of steel specifications, a variety of layout methods to combine to form a large number of layout schemes, each node scheme for numerical simulation analysis. A large number of analysis results are compared and studied. Setting channel steel and steel plate in the joint wall can improve the deformation and crack of the joint, but excessive steel will produce greater rigidity, which will lead to stress concentration in the wall and new stress problem. Therefore, the adoption of the above two measures need specific analysis of specific problems. After the detailed calculation of the concrete structure to determine the steel specifications and layout. The method of local reinforcement encryption in the wall can better solve the cracking problem of the wall and the construction technology is more convenient. In view of the problems existing in the corner of the top elevator shaft, the steel plate is added in the wall and the longitudinal reinforcement in the wall is infilled. Three reinforcement measures are added to the wall to strengthen the joint. Numerical simulation of various schemes under the three measures can result in the addition of steel plate. Local reinforcement encryption has no effect on the joint stress, and the steel plate will cause serious stress concentration in the wall. The addition of channel steel in the wall can improve the deformation of the joint to a certain extent. However, it can not solve the problem of stress imbalance of beam tendons. It can be concluded that other solutions should be found for the stress problems of the joints here.
【学位授予单位】：中国海洋大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU973.17

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