Research on the Mechanical Properties of Steel Truss Support Platform During the Construction of the Roof of a Large-Scale Silo
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摘要: 为研究钢桁架支撑平台在大直径筒仓仓顶施工中的受力性能,以广东省某筒仓工程为例,对仓顶混凝土浇筑过程中钢桁架支撑平台的受力状态进行了全过程监测。结果表明:钢桁架支撑平台的吊装过程中,因各吊点不能完全保证在同一水平高度,导致支撑平台主要受力构件的最大稳定应力比为0.25;仓顶斜锥壳混凝土浇筑过程中,各主要受力构件的稳定应力比均不高于0.58,架体最大竖向挠度为22 mm;仓顶平屋顶混凝土浇筑过程中,由于斜锥壳区域混凝土已经硬化能够承担大部分竖向荷载,钢桁架支撑平台的应力最大值不超过18 MPa。即钢桁架支撑平台具有较高的安全储备,并有一定的优化空间。最后,采用ABAQUS软件对筒仓仓顶施工过程进行了模拟,总体上数值结果和实测结果较为吻合,表明可采用数值方法开展大直径筒仓仓顶施工钢桁架支撑平台受力性能研究。Abstract: To study the mechanical properties of steel truss support platform during the construction of the roof of large-scale silos, taking a silo project in Guangdong province as an example, the force condition of steel support platform was monitored during the whole concrete pouring process on the silo roof. The results showed that, because the lifting points were not at the same horizontal height, the maximum stable stress ratio of the main components of the platform was 0.25 during the lifting process. In the concrete pouring process of the inclined shell roof, the stable stress ratio of the main components was not more than 0.58, and the maximum vertical deflection of the support platform was 22 mm. In the process of concrete pouring of the top flat roof, the maximum stress of the support platform was less than 18 MPa because the concrete of inclined shell roof had hardened and could bear the most vertical load. The above indicated that the support platform had enough safety reserve and could be optimized. Finally, the silo roof construction process was simulated by using the ABAQUS software. On the whole, the simulated results agreed well with the measured results which indicated that the numerical method could be used to study the mechanical properties of steel truss support platform during the construction of the roof of large-scale silos.
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