新型异形曲面钢⁃木组合结构临时支撑卸载方案优化与监测  

Scheme Optimization and Monitoring of Temporary Support Unloading of New Special⁃shaped Curved Steel⁃wood Composite Structure

作　　者：郑永飞 刘俊奇 孙国军[2] 何林玲 乔崎云[2] ZHENG Yongfei;LIU Junqi;SUN Guojun;HE Linling;QIAO Qiyun(CCCC Fourth Highway Engineering Bureau Co.,Ltd.,Beijing 101399,China;Faculty of Architecture,Civil and Transportation Engineering,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]中交第四公路工程局有限公司,北京101399 [2]北京工业大学城市建设学部,北京100124

出　　处：《施工技术（中英文）》2024年第13期160-165,共6页Construction Technology

基　　金：国家重点研发计划(2019YFD1101003)。

摘　　要：温州未来城区体验馆屋面结构采用异形曲面钢木组合,立面采用纤细的两端铰接的钢立柱,钢立柱同时作为玻璃幕墙的支承结构,地上抗侧力墙体采用钢骨混凝土墙体,地下室为混凝土结构。充分利用了木结构和钢结构的优势,最大程度减少结构的用钢量。但由于结构跨度大且形状复杂,施工阶段存在安装偏差,临时支撑拆卸需要较高的同步性及稳定性,需要基于实际起拱坐标和荷载状态,对其卸载过程进行计算分析和施工监测以确保结构安全。基于实际施工情况,运用MIDAS/GEN对该组合结构的卸载施工过程进行了数值模拟计算,通过已有的初步方案明确了各施工步中的杆件内力以及节点位移,并在此基础上提出了分步分级的优化方案,同时对其在卸载施工过程中的位移响应进行了动态监测。计算结果表明:通过对52个千斤顶进行分步卸载,支撑点位移与构件应力成倍增加,采取分级卸载策略,逐步减小荷载,成功实现了对结构的精准控制,避免了内部过度变形和应力集中,确保了结构稳定性。监测点的实际值与理论值误差在合理范围内,验证了模拟分析的准确性,为工程实践提供了可靠支持。The roof structure of the Wenzhou Future Community Experience Hall features a unique combination of steel and wood with a specially⁃shaped curved surface.The facade incorporates slender steel columns hinged at both ends,serving as supports for the glass curtain wall.This design optimally leverages the advantages of both wood and steel structures,minimizing steel usage.However,due to the large span and intricate shape,the disassembly of temporary supports necessitates precise synchronization and stability.Unloading requires meticulous calculation,analysis,and construction monitoring based on actual arch coordinates to ensure structural safety.Using MIDAS/GEN,this study conducts numerical simulations for the unloading construction process of the composite structure.The existing preliminary scheme defines internal forces and joint displacements in each construction step,forming the basis for proposing an optimized step⁃by⁃step and classified unloading scheme.Concurrently,the displacement response during the unloading construction process is dynamically monitored.The calculation results demonstrate that unloading 52 jacks step by step effectively doubles the displacement of support points and member stresses.The gradual reduction of load,employing a staged unloading strategy,successfully achieves accurate structural control,preventing excessive internal deformation and stress concentration,and ensuring overall stability.The error between the actual and theoretical values of monitoring points remains within a reasonable range,confirming the accuracy of the simulation analysis and providing reliable support for engineering practice.

关 键 词：屋面 组合结构 临时支撑 卸载 监测 数值模拟 

分 类 号：TU758[建筑科学—建筑技术科学]