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马拉维国家体育场结构分为看台和钢结构屋盖两部分。看台属于超长结构,采用钢筋混凝土框架结构体系;钢结构屋盖采用立体拱桁架+联系桁架结构体系。钢结构屋盖拱脚支墩采用重力式天然基础,并配合预应力钢丝束与看台底板拉结,通过基础底部的摩擦力、支墩背部的被动土压力以及预应力钢丝束拉力共同抵抗钢结构屋盖内外拱的水平推力,其中支墩背部的被动土压力作为结构安全贮备。通过合理设计钢结构屋盖拱脚支墩的平面形状使钢结构屋盖内外拱的拱脚水平推力与基础底板拉力的合力点位于墩台的形心位置,从而使拱脚基础反力均匀布置。对钢结构屋盖进行了恒载+满跨活载工况和恒载+半跨活载工况下的稳定性分析,对关键节点进行了精细化有限元分析。结果表明,钢结构屋盖的整体稳定性和节点承载力均满足设计要求。
Malawi National Stadium structure is divided into two parts of the stands and steel roofs. Stand is a long structure, the use of reinforced concrete frame structure system; steel roof truss + truss truss structure system. The steel structure arch foot pier adopts the natural foundation of gravity and cooperates with the prestressed steel wire strand to pull the knot with the floor of the grandstand to jointly resist the steel structure through the friction at the base bottom, the passive earth pressure at the back of the pier and the tension of the prestressed steel wire bundle The level of thrust inside and outside the roof arch, where the back of the pier passive earth pressure as a structural safety reserve. Through the rational design of the flat shape of the arch foot pier of the steel structure roof, the joint force between the horizontal thrust of the arch and foot of the steel arch inside and outside the arch and the pull force of the foundation floor is located at the centroid of the abutment so that the reaction force of the arch foot is uniformly arranged . The stability analysis of steel roof was carried out under full load + full span live load condition and under the condition of dead load + semi-span live load condition. The finite element analysis of key nodes was carried out. The results show that the overall stability of steel roof and node bearing capacity meet the design requirements.