摘要
施工过程是保证结构使用性能可靠、质量达标的重要阶段,并且伴随社会经济的发展,对施工质量要求也逐渐提高。环境温度是影响施工精度、保证施工质量的关键因素,其在铁路、桥梁等大跨超长结构中广受关注,但在建筑结构的施工阶段研究较少。随着建筑结构设计日益复杂,体量日益增大,环境温度对施工的影响也开始显现。针对高层连体结构中常用的整体提升施工技术,探讨了环境温度在连体拼装以及连体提升这两个重要施工阶段的影响:1)拼装阶段,连体结构受到下部拼装胎架、支撑架等措施的约束,使得其在温度作用下产生附加内力及变形,下部措施结构分别按极小水平约束与刚接两个极端条件考虑。2)提升阶段,连体结构无水平约束,水平方向可自由变形,因而会显著影响连体在高空与塔楼结构对接精度的影响。为此提出将温度变形与施工变形进行叠加,从而综合考虑温度对连体提升精度的影响。分析中,以有限元模拟为基础,通过线性拟合获取关键对接点变形与温度的关系,进一步计算温度与对接错口量关系,从而得到错口量最小时的温度差,以此温差指导提升施工的时间安排。最后,以杭州云门钢结构工程为例,分析了环境温度在该项目中的影响。拼装阶段若不考虑胎架的水平约束,环境温度对结构的附加应力小。反之则会引起较大的附加应力,甚至超过钢材的屈服应力,该计算结果是基于极端情况下的计算,即温差变化大,约束强,实际工程条件出现的概率低。因此,建议应力分析中应根据工程项目的真实环境、措施使用等情况,选择合理的温差和边界条件进行分析,从而判断温差对结构附加应力的影响。对于云门钢结构的提升阶段,分析结果表明,当提升时的环境温度低于拼装时27.6℃时,连体与塔楼错口量最低。由于该温差太大,不可能在真实环境中�
The construction process is an important stage to ensure the reliable performance of the structure and to meet the quality standards.With the development of social economy,the requirements for construction quality are gradually improved.Ambient temperature is the key factor which affects the construction accuracy and maintains the construction quality.It is widely concerned in long-span structures such as railways and bridges,but there is less research in the construction stage of building structures.With the increasing complexity of building structure design and the increasing structure dimension,the impact of ambient temperature on construction begins to appear.Therefore,based on the integral lifting technology,which is widely applied in high-rise connected structures,this paper discusses the influence of ambient temperature on the two important construction process,assembling and lifting stage.In the assembly stage,the connected structure is constrained by the tire frame and support frame,so that it produces additional internal forces and deformation under the action of temperature.The structure of the supporting measures are considered under two extreme conditions:minimal horizontal constraint and rigid connection.In the lifting stage,the connected structure has no horizontal constraint and can be freely deformed in the horizontal direction,which will significantly affect the influence of the connected structure docking accuracy with the tower structure at high altitude.In this paper,the temperature deformation and construction deformation are superimposed and it is proposed to comprehensively consider the influence of the temperature deformation and the construction deformation on the lifting accuracy of connected structure.In the specific analysis,based on the finite element simulation,the relationship between the deformation of the key linking point and the temperature is obtained by linear fitting.The relationship between the temperature and the amount of docking is further calculated,so as to obtain the
作者
刘传林
叶冬晨
宗荣
邢遵胜
杨飞
徐常森
Chuanlin Liu;Dongchen Ye;Rong Zong;Zunsheng Xing;Fei Yang;Changsen Xu(China Railway Construction Group Co.,Ltd.,Beijing 100040,China;Zhejiang Jinggong Steel Building Group Co.,Ltd.,Shaoxing 312030,China)
出处
《钢结构（中英文）》
2024年第4期26-33,共8页
Steel Construction（Chinese & English）
关键词
环境温度
整体提升
连体结构
拼装阶段
提升阶段
ambient temperature
integral lifting
high-rise connected structure
assembly stage
lifting stage
