摘要
雄安超算云项目结构造型新颖,空间关系复杂,屋盖下部楼板错层,安装方案的选择和支撑布置难度大,需选择合理支撑卸载顺序保证结构卸载安全。屋盖钢结构采用斜向交叉网格桁架结构体系,桁架弦杆相互斜交,网格桁架西侧呈弧形向下延伸交于封边梁,再通过变截面弧形弯扭V型支撑将屋盖荷载传递给下部框架,网格桁架东侧与立体拱桁架连接,跨中布置少量的圆钢管柱,形成大跨空间结构。运用深化设计技术对大跨结构进行节点优化设计,使弯扭V型支撑加工后满足结构传力及建筑造型的需求。根据项目结构体系及布置特点,通过对提升方案、滑移方案和吊装方案等三种方案的支撑体系、施工难易程度、安全管理难度、进度及施工成本的横向对比分析,选择最优的分段原位吊装方案。东侧立体拱桁架根据结构构造,将拱形桁架合理拆分成上下两榀桁架,下一榀桁架设置支撑分段安装定位,同时下一榀桁架提供支点支撑上一榀桁架,解决了拱形桁架高度高、重量大而难以安装的施工难题。对大跨斜交网格桁架进行合理分段划分,设置多跨门式支撑体系,采用塔吊分段安装屋盖交叉网格桁架,并采用交叉稳定杆进行结构安装过程中的临时固定,解决了网格桁架单片安装过程中的平面外稳定的施工难题,保证了桁架结构安装精度。多台塔吊从屋盖结构角部向核心区推进的安装顺序,既解决了每一步安装均能形成临时稳定体系确保施工安全,又能多机同步安装提高施工进度,为其他大跨桁架结构安装提供参考。运用有限元分析软件MIDAS/Gen,计算温度应力对大跨交叉网格结构卸载的影响,对大跨交叉桁架是否考虑温度应力和卸载方向的不同组合进行多工况卸载模拟分析对比,分析结构最大应力与最大变形的应力、应变云图。通过模拟计算研究表明,多支点大跨交叉桁架卸�
The structure of the Xiongan Supercomputer cloud project is novel in shape,and the spatial relationship is complex.The floor under the roof is split-level,so it is difficult to choose the installation plan and support layout.Therefore,it is necessary to choose a reasonable support unloading sequence to ensure the safety of the structure unloading.The roof steel structure adopted the diagonal cross grid truss structure system,and the truss strings were inclined to each other.The west side of the grid truss extended down in an arc to the sealing beam,and then the roof load was transferred to the lower frame through the curved curved torsion V-shaped support of the variable section.The east side of the grid truss connected with the three-dimensional arch truss,and a small number of round steel pipe strings were arranged in the span to form the long-span spatial structure.The deep design technology was used to optimize the joint design of the long-span structure,so that the bending and twisting V-shaped support processing could meet the demands of the structural force transmission and architectural modeling.According to the structural system and layout characteristics of the project,through the horizontal comparative analysis of the support system,construction difficulty,safety management difficulty,schedule and construction cost of the three schemes,such as lifting scheme,sliding scheme and hoisting scheme,the optimal segmented in-situ hoisting scheme was selected.The east stereoscopic arch truss divided the arch truss into the upper and lower trusses reasonably according to the structure.The next trusses set the support for sectional installation and positioning.At the same time,the next trusses provided the fulcrum to support the previous trusses,which solved the construction problem that the arch trusses are high in height and heavy in weight and difficult to install.The long-span oblique grid truss was divided into reasonable segments,and the multi-span portal support system adopts tower crane to install the roo
作者
杨国松
邹焕苗
崔强
Guosong Yang;Huanmiao Zou;Qiang Cui(Jiangsu Huning Steel Mechanism Co.,Ltd.,Yixing 214231,China;China Academy of Building Research,Beijing 100013,China;National Construction Engineering Technology Research Center,Beijing 100013,China)
出处
《钢结构（中英文）》
2022年第12期37-44,共8页
Steel Construction（Chinese & English）
关键词
交叉桁架钢结构
弯扭曲面
有限元分析
支撑
卸载
cross truss steel structure
plane of bending
finite element analysis
support
unloading
