Research on the Synchronization and Closing Control of the New Nanjing Art Museum
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摘要: 南京美术馆新馆地上四层为组合筒体-斜柱-钢桁架混合结构体系,钢结构总量约1.5万t。上部结构为复杂多层空间不规则回字形钢桁架结构,由大跨度桁架、悬挑桁架及周圈内外两道环形桁架构成,分上、下二层,局部三层,桁架高度14.2 m,顶标高为33.7 m;外轮廓尺寸为147.5 m×103.3 m,内开口尺寸为102.8 m× 38.0 m。钢桁架通过4个筒体和10根圆钢管混凝土斜柱支撑,采用“地面原位拼装、整体提升”的施工思路,利用核心筒和临时支撑塔架作为提升的支撑,对钢桁架进行提升施工。针对提升点位选取难题,确定了尽量与设计状态吻合、传力路径短、结构受力均匀、变形小的提升点布置原则,通过全过程施工动态仿真分析,优选确定了29个混合提升点;针对提升支撑体系设置难度大的问题,研发了用于大型复杂异形桁架提升的多点位混合支撑体系,包括在核心筒柱顶及预装桁架上的提升反力架,在南、北两区8根斜柱支撑位置布置的塔架支撑,以及提升支架加固及提升塔架加固支撑体系,满足了安全性与安装精度的要求;针对刚度不均匀大型复杂空间结构液压提升同步难度大的问题,提出了提升同步性控制的三种方法:全部提升点位移偏差平方和最小方法、提升点坐标极小值与极大值之差最小方法、最大的偏差绝对值最小方法,并推导出了详细的计算公式,且在南京美术馆新馆项目上成功应用,实现了复杂条件下的精确同步提升;在同步控制方面,采用提升同步控制数据的自动测量系统,通过智能测量机器人采集数据,能够直观反映各提升点间的不同步情况,同时还采取了静力水准仪测量和人工测量两种测量方式互为校验。针对结构平立面不规则、对口点数量多、点位分布无规律、对口点空间角度定位各不相同的难题,以3个坐标系旋转参数和3个平移参数为独立参数,采用Bursa模型,进行了基于一般旋转平移对口模型的研究,并给出了常规三维旋转平移对口模型的求解方法和解析解。结合上述方法和对口安装控制措施,调整后的对口点无论是均值、均方差还是概率分布都有了明显的提高,实现了精准对口。Abstract: The four floors above ground of the new Nanjing Art Museum are a composite tube inclined column steel truss hybrid structure system, with a total steel structure of approximately 15 000 tons. The upper structure is a complex multi-layer irregular circular steel truss structure, consisting of a large-span truss, a cantilever truss, and two circular trusses inside and outside the perimeter. It is divided into two levels: upper and lower, and locally three levels. The truss height is 14. 2 m, and the top elevation is 33. 7 m; the overall size of the outer wheel is 147. 5 m× 103. 3 m, and inner opening size is 102. 8 m × 38. 0 m. The steel truss is supported by 4 cylinders and 10 circular steel tube concrete inclined columns. The construction concept of " in-situ assembly on the ground and overall lifting" is adopted, and the core cylinder and temporary support tower are used as lifting supports to lift the steel truss. In response to the difficult problem of selecting lifting points, the principles of arranging lifting points that are as close as possible to the design state, short force transmission path, uniform structural stress, and small deformation have been determined. Through dynamic simulation analysis of the entire construction process, 29 mixed lifting points have been selected and determined; in response to the difficulty in setting up the lifting support system, a multi-point hybrid support system for the lifting of large and complex irregular trusses has been developed, including lifting reaction frames on the top of the core cylinder column and pre installed trusses, tower supports arranged at the support positions of eight diagonal columns in the south and north zones, and lifting bracket reinforcement and lifting tower reinforcement support systems, meeting the requirements of safety and installation accuracy; in response to the difficulty of hydraulic lifting synchronization for large and complex spatial structures with uneven stiffness, three methods for improving synchronization control were proposed: the minimum sum of squares of displacement deviation at all lifting points, the minimum difference between the minimum and maximum coordinates of lifting points, and the minimum absolute value of maximum deviation. Detailed calculation formulas were derived and successfully applied in the new museum project of Nanjing Art Museum, which achieves precise synchronization improvement under complex conditions; in terms of synchronous control, an automatic measurement system is adopted to enhance synchronous control data. By collecting data through an intelligent measurement robot, the asynchronous situation between each lifting point can be intuitively reflected. At the same time, static level measurement and manual measurement are also used for mutual verification. In response to the challenges of irregular structural plane and elevation, large number of matching points, irregular distribution of point positions, and different spatial angle positioning of matching points, the Bursa model was used to study the general rotation translation matching model with 3 coordinate system rotation parameters and 3 translation parameters as independent parameters. The solution method and analytical solution of the conventional 3D rotation translation matching model were provided. By combining the above methods and corresponding installation control measures, the adjusted alignment points have significantly improved in terms of mean, mean square deviation, and probability distribution, achieving precise alignment.
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Key words:
- integral lifting /
- synchronization /
- alignment point to point
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