加强层布置及连接方式对超高层结构竖向变形的影响分析

发布时间：2018-01-06 14:39

本文关键词：加强层布置及连接方式对超高层结构竖向变形的影响分析　出处：《哈尔滨工业大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着经济水平、施工技术的不断发展,我国超高层建筑如雨后春笋般地在各地大规模涌现。超高层建筑是当代社会经济发展和科技进步的产物,一方面解决了城市用地紧张的问题,另一方面更是逐渐成为了城市的地标和社会繁荣的象征。为了应对超高层建筑过大的侧向变形,逐渐出现了带加强层的外框架-核心筒结构。但是同时墙柱竖向变形差会导致包括伸臂在内的水平构件产生较大的附加应力,施工上往往通过延迟封闭、设置铰接等方式对附加应力进行释放。本文基于前人的研究成果,进一步完善为抗侧向位移而设置的加强层对超高层竖向变形和伸臂内力影响的研究,其目的是为工程实践领域选用加强层提供建议和参考。本文以沈阳宝能T2塔楼超高层项目施工模拟分析作为引例,继而通过有限元软件Midas/Gen对超高层建筑有无加强层进行对比研究,得出加强层对竖向变形差和伸臂内力有较明显影响的初步结论。在超高层结构加强层对竖向变形的影响分析中,最值得关注的是加强层不同布置方式的影响性分析。本文采用控制变量法,并建立多个有限元分析模型,较全面地研究了单个布置方式因素作用下加强层对竖向变形差的影响效果和程度。因抗侧向位移而设置的加强层对墙柱竖向变形差有比较明显的影响,这种影响使得竖向变形差有明显的减小,但是要有伸臂附加内力变大的代价。通过增加加强层数量,增多每道加强层跨越层数及伸臂肢数,可以降低伸臂的附加内力。本文对不同高度建筑中加强层对竖向变形的影响进行分析,分别建立100米、200米、300米的三个超高层模型。通过对每种高度建筑进行详细地施工模拟分析、伸臂附加内力和墙柱竖向变形分析,对比研究了不同高度建筑对设置加强层的敏感程度。为控制水平构件附加应力,可采取伸臂铰接和延迟封闭的施工措施。《高层建筑混凝土结构技术规程》中规定伸臂桁架必须与核心筒具有可靠刚接,但是与外框架的连接方式没有硬性规定。本文对三种不同连接方式刚接、半刚接、铰接分别进行竖向变形差和伸臂桁架内力计算,得出了伸臂桁架与外框架不同连接方式对竖向变形差和伸臂桁架内力的影响。对于一道和四道伸臂这两种情况,通过有限元模型施工模拟的方式,分别采用施工延迟和不采用延迟进行对比分析,研究得出了不同施工方式对竖向变形差的影响程度情况。
[Abstract]:Along with the economic level, the continuous development of construction technology, China's high-rise buildings such as bamboo shoots after a spring rain like around the emergence. Super high-rise building is the product of contemporary social economic development and the progress of science and technology, a city to solve the problem of shortage of land, on the other hand is gradually become a symbol of the city's landmarks and social prosperity. In order to cope with the high-rise building large lateral deformation, the gradual emergence of the frame core tube structure with strengthened layer. But at the same time the wall column vertical deformation difference will lead to greater additional stress level, including outrigger component construction, often through delay closed, is provided by means of the release of additional stress. Based on previous research results, further improve the anti lateral displacement and set up to strengthen the study of layers of high-rise cantilever vertical deformation and internal force, its purpose is to The field of engineering practice by strengthening layer to provide advice and reference. This paper takes Shenyang Bao T2 tower high-rise project construction simulation analysis as the example, and then through the finite element software Midas/Gen of high-rise buildings have no comparative study of reinforced layer, it is found that the strengthening of the preliminary conclusion layer on vertical deformation difference and arm force has a significant effect on high-rise. Analysis of the influence of structure strengthening layer on vertical deformation, the most concern is to strengthen the analysis of influence of different layer layout. This paper uses the method of controlling variables, and establish a finite element analysis model, a comprehensive study of strengthening layer on vertical deformation effect and influence factors of individual difference arrangement for resisting lateral displacement and the establishment of the strengthening layer on the wall column vertical deformation difference has significant influence, the influence that the vertical deformation difference is obviously reduced, but Additional internal force arm larger price. By increasing the number of layers to strengthen, each increase reinforcing layer across the layers and the overhanging limb, can reduce the additional internal force arm. This effect of strengthening layer on vertical deformation of different height of buildings are analyzed, respectively set up 100 meters, 200 meters, three meters tall model 300 the detail construction simulation analysis based on each kind of building height, additional internal force and deformation analysis of cantilever column vertical wall, comparative study of different building height, strengthen the sensitive layer on the set. For the control level of the additional stress of the parts can be taken, and delayed closure of the outrigger hinge construction measures of high-rise buildings. The technical specification for concrete structures "provisions must be reliable with rigid outriggers and core tube, and the connecting mode of the frame but not mandatory. The three different connection mode of rigid, semi rigid, articulated To calculate the internal force and deformation of vertical deviation and outrigger truss, the influence of connection mode of outrigger truss and the outer frame of the vertical deformation and internal force of outrigger truss. The two one and the four arm, through the construction of finite element model simulation method, were used to delay and the delay construction were analyzed study on the different construction methods, the vertical deformation difference the influence degree.

【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU973.2

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