
48
DOI:10. 7672/sgjs2014200048
施工技术
CONSTRUCTIONTECHNOLOGY
2014年10月下
第43卷
曲靖体育中心体育场大型悬挑钢桁架临时
支撑卸载施工技术梁德初,温岳斌,龙期亮
(广西建工集团第三建筑工程有限责任公司,广西桥州545001)
第20期
摘要】随着科学技术的不断发展,大跨度空间钢结构已广泛应用于体育场馆,但由于结构空间跨度大,造型新颗,结构受力复杂,施工过程结构受力与设计受力状态不可能完全一致,如果仍然沿用传统的设计和施工方法,根本无法确保结构的安全。因此,利用有限元理论对大型悬挑钢桁架临时支撑卸载进行模拟计算,分析卸载过程中结构
内力和位移的变化,然后确定钢结构临时支撑卸载的顺序和方法,可有效保证施工阶段的安全和结构质量。【关键词】钢结构;悬挑;桁架;临时支撑;卸载;数值模拟
【中图分类号】TU758.11
【文献标识码]A
【文章编号】1002-8498(2014)20-0048-03
Large Cantilever Steel Truss Temporary Supports Unloading
ConstructionofQujingSportsCenterStadium
Liang Dechu,Wen Yuebin,Long Qiliang
(Guangxi Construction Engineering Group the Third Construction Engineering Compary,Liuzhou,Guangxi 545001,China) Abstract:With the continuous development of science and technology,large-span space steel structure has been widely used in sports venues, but because of the large span of space structure, novel model, complex structure, construction process of structure stress and design stress state can't completely consistent, if it still use the traditional design and construction methods, it cannot ensure the safety of the structure. Therefore, the theory of finite element for large cantilever steel truss temporary supports unloading is used to analyze the change of the structure internal force and displacement in the process of unloading, then determine the order of the steel structure temporary supports unloading and method,
which can effectively ensure the quality of the structure of the construction phase of the safety. Key words steel structures; cantilever; trusses; temporary support; unloading; simulation
1工程概况
曲靖体育中心体育场屋面为大型钢桁架悬挑罩棚,呈“马鞍”型。东西两端高,长约230m;南北两端低,长约260m。屋盖钢结构为48榻X形单元结构及其之间的侧向杆件、环向支撑组成的空间结构,最大悬挑跨度43m,结构采用无缝钢管相贯焊接
而成。每福X形单元由2榻径向桁架组成,径向桁架下部、中部、悬挑端均通过桁架侧向连接,形成环向整体受力体系,安装时在悬挑端部设置临时支撑架进行安装固定,施工完成后再把支撑架卸载完
成,如图1所示。 2卸载原理
[作者简介]案德初,总工程师,高级工程师,E-mail:liangdevip@ sina.cor
【收稿日期】2013-10-21 万方数据
图1悬挑钢桁架临时支撑架
Cantilever steel truss temporary support frame
Fig.1
卸载是结构受力逐渐转移和内力重分布的过程,临时支撑作为悬挑钢结构的弹性约束,并随着临时支撑的卸载,其弹性约束程度在不断地变化。在此过程中临时支撑与悬挑钢结构从完全接触逐渐转为完全脱离,即临时支撑由承载状态逐渐转为空载状态,而悬挑钢结构则由支撑状态逐渐转为悬