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某火力发电厂采用钢桁架-钢筋混凝土管柱结构。为了有效评价该结构的安全状况和弥补抗震设计依据不足,采用模型试验和有限元数值分析相结合的方法研究了实际结构的动力特性和抗震性能。结果表明,试验数据与计算结果吻合较好,结构能满足抗震设防要求,但应考虑结构抗扭问题和管柱的重力二阶效应,管柱节点和屋面支撑空冷设备的三角形钢架(A形架)下部是薄弱部位,管柱裂缝比实心柱大,裂缝主要在柱下部,应提高柱端箍筋加密高度,桁架悬挑部位挠度超过限值,地震作用下桁架悬挑部分杆件内力变化剧烈,应增大设计截面。
A thermal power plant using steel truss - reinforced concrete column structure. In order to effectively evaluate the safety of the structure and make up for the lack of basis for seismic design, the dynamic characteristics and seismic performance of the actual structure are studied by the combination of model test and finite element numerical analysis. The results show that the experimental data are in good agreement with the calculated results and the structure can meet the requirements of seismic fortification. However, the torsional torsion of the structure and the second-order gravity effect of the pipe string should be considered. The triangular steel frame The lower part of the frame is weak, the crack of the column is bigger than the solid column, the crack is mainly at the lower part of the column, the height of the stirrup on the column end should be increased, the deflection of truss overhang exceeds the limit, Severe, should increase the design cross section.