树形支撑双向倾斜钢屋盖施工全过程仿真分析与监测

Simulation Analysis and Monitoring of Construction Process of Bidirectional Inclined Steel Roof Supported by Tree-shaped Structure

陕西某下沉式广场屋盖采用树形支撑双向倾斜钢屋盖结构体系,整体由斜交H型钢网格板、树形撑杆以及钢筋混凝土柱组成。为了保证钢屋盖在整个施工过程中的安装精度和安全性,依据拟定的施工方法和施工顺序建立数值仿真模型,对钢屋盖的吊装、卸载的全过程进行施工仿真分析。并且对比分步加载成型和一次加载成型结构的力学性能,揭示施工过程对结构受力及变形的影响,进一步验证了施工过程的安全性以及结构成型的合理性。在现场对关键节点的竖向位移进行了监测,并且将数值模拟值与实测值进行对比,总结了施工全过程位移变化规律。现场监测与数值模拟结果有效验证了施工方案的合理性和可靠性,可为同类工程提供借鉴。

The roof of a sunken square in Shaanxi province adopts the structure system of bidirectional inclined steel roof supported by tree-shaped structure,which is composed of diagonal H-section steel grid plate,tree pole and reinforced concrete column.In order to ensure the installation accuracy and safety of steel roof in the whole construction process,a numerical simulation model is established according to the proposed construction method and construction sequence,and the whole process of lifting and unloading of steel roof is simulated.Moreover,by comparing the mechanical properties of the structure formed by step loading and single loading,the influence of the construction process on the force and deformation of the structure is revealed,and the safety of the construction process and the rationality of the structure forming are further verified.The vertical displacement of key nodes is monitored on site,and the numerical simulation value is compared with the measured value,and the displacement variation law of the whole construction process is summarized.The field monitoring and numerical simulation results effectively verify the rationality and reliability of the construction scheme.The results of this paper can provide reference for similar projects.