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外挂内爬式塔吊附着支撑体系及周边墙体分析

发布时间:2019-01-12 07:50
【摘要】:近年来,我国经济领域飞跃发展的同时,城市化进程也快速向前推进,受城市建筑日益密集化的限制,高层建筑和超高层建筑成为各个城市热切追求的建筑形式,核心筒结构形式在超高层建筑的结构形式设计中应用最为广泛,作为超高层建筑施工中不可或缺的运输机械,选用合适的塔吊形式可以缩短施工工期从而提高经济效益。由于外挂内爬式塔吊具有固定基础附着式和传统内爬式塔吊所不具备的优势,在超高层建筑的施工建造过程中逐渐应用广泛。本文阐述了外挂内爬式塔吊在实际典型超高层建筑建造过程中的应用以及研究成果,介绍了外挂内爬式塔吊附着支撑体系结构形式和爬升原理;结合南宁龙光世纪大厦工程实例,对外挂内爬式塔吊附着支撑体系以及预埋件周边主体部位利用有限元分析软件进行计算分析,根据塔臂在水平面上所处角度的不同分为八个工况,通过对有限元模型在八个工况下塔吊附着框架各构件内力以及支座反力的对比分析,判断当吊臂与墙体平行时为较不利工况,在实际施工时塔吊应避免在此工况下长时间处于满荷状态;针对本论文背景工程预埋件设计,在直锚筋形式预埋件不满足设计规范的情况下,选用钢板形式预埋件作为替换方案,本文通过有限元软件验证钢板形式预埋件能够满足塔吊正常运行时的强度要求;随着塔吊向上爬升的过程,支承架预埋件面临布设位置选择问题,合理选择预埋件布设位置可以有效减小预埋件周边墙体应力应变水平,选取预埋件位于墙体中间和连梁上两种情况,利用有限元软件ABAQUS建立预埋件和墙体的有限元模型,通过对比两种情况下墙体的应力应变水平,从墙体应力应变角度对塔吊支承架预埋件的布设位置提供切实可行的建议。
[Abstract]:In recent years, with the rapid development of economic field in China, the process of urbanization is also moving forward rapidly. Due to the increasingly dense urban buildings, high-rise buildings and super-high-rise buildings have become the hot pursuit of the architectural form of each city. The core-tube structure is widely used in the structural design of super-tall buildings. As an indispensable transport machinery in the construction of super-high-rise buildings, choosing the appropriate tower crane can shorten the construction period and improve the economic efficiency. Owing to the advantages of internal climbing tower cranes with fixed foundation and traditional climbing tower cranes, they are widely used in the construction process of super high-rise buildings. In this paper, the application and research results of external mounted internal climbing tower crane in the construction process of typical super high-rise building are described, and the structure form and climbing principle of attached support system of external and internal climbing tower crane are introduced. Combined with the example of Longguang Century Building in Nanning, the attachment support system of internal climbing tower crane and the main parts around the embedded parts were calculated and analyzed by finite element analysis software. According to the different angles of the tower arm in the horizontal plane, it is divided into eight working conditions. By comparing the internal force and the support reaction force of each member of the tower crane attachment frame under the eight working conditions, the finite element model is compared and analyzed. It is judged that when the boom is parallel to the wall, it is unfavorable, and the tower crane should be avoided under this condition for a long time under the condition of full load. In view of the design of embedded parts in the background engineering of this paper, if the embedded parts in the form of straight anchor bars do not meet the design specifications, the steel plate embedded parts are selected as the replacement scheme. In this paper, the finite element software is used to verify that the steel plate embedded parts can meet the strength requirements of the tower crane in normal operation. As the tower crane climbs upward, the support member is faced with the problem of location selection. The reasonable selection of the location of the embedded part can effectively reduce the stress and strain level of the wall around the embedded part. In this paper, the finite element model of the embedded part and the wall is established by using the finite element software ABAQUS, and the stress and strain level of the wall is compared by comparing the stress and strain levels of the wall under the two conditions, which are located in the middle of the wall and on the connecting beam. From the angle of stress and strain of the wall, practical suggestions are provided for the placement of the pre-buried parts of the tower crane support frame.
【学位授予单位】:武汉理工大学
【学位级别】:硕士
【学位授予年份】:2015
【分类号】:TU974;TU61

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