榆林榆阳机场T2航站楼结构设计

Structural design on T2 terminal of Yulin Yuyang Airport

榆林榆阳机场T2航站楼下部主体结构为钢筋混凝土框架结构,屋盖采用树状柱与V形斜柱支承的张弦拱梁结构。张弦结构对风荷载较为敏感,为保证风荷载取值的准确性,采用风洞试验模型、数值模拟和等效静力风荷载等方法确定屋面风荷载分布及大小,综合分析得出了索内施加预应力的最佳值。对各个风向角风荷载作用下索内力进行分析,计算表明在风向角0°和180°时下弦个别拉索呈现松弛状态,为确保拉索不退出工作,在上弦钢拱梁内灌注水泥砂浆,采用增加配重的方法能有效抵抗风吸力。对复杂铸钢结构节点进行了有限元分析。对超长楼板进行温度作用分析,设置温度钢筋,提高楼板抗裂性能。采用YJK和MIDAS软件建立整体模型进行分析,以研究结构整体受力性能。

The lower main structure of T2 terminal of Yulin Yuyang Airport adopts reinforced concrete frame structure, and the roof adopts the string-beam structure supported by tree-like column and V-shaped inclined column. Tension-string structures are sensitive to wind load. In order to ensure the accuracy of wind load value, wind tunnel test model, numerical simulation and equivalent static wind load were used to determine the distribution and magnitude of wind load on the roof. The optimum value of prestress applied in cable was obtained by comprehensive analysis. The analysis of the internal force of the cable under the wind load at each wind angle shows that some of the lower cables show a relaxed state when the wind angle is 0° and 180°. In order to ensure that the cable does not quit working, cement mortar was poured into the upper steel arch beam and the method of increasing the counterweight can effectively resist the wind suction. The finite element analysis of complex cast steel structure joints was carried out. The effect of temperature on super long floor slab was analyzed, and the steel bar with setting temperature was adopted to improve the crack resistance of floor slab. YJK and MIDAS software were used to establish an overall model for analysis to study the overall mechanical performance of the structure.