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为了寻求Maputo大桥较佳气动性能的主梁,针对设计提出的三种方案,采用风洞试验和数值计算相结合的方法,获得三种方案的静风失稳临界风速以及颤振临界风速,对比分析了各主梁的静动力稳定性能。静风稳定性计算结果表明,三种主梁的静风失稳形态均表现为弯扭空间耦合,其中,钢箱叠合梁静风稳定性最优,静风响应也较小;颤振试验结果表明,三种主梁的颤振稳定性均不满足要求,钢箱叠合梁颤振稳定性相对更好;通过在钢箱叠合梁上设置水平导流板,可使其满足颤振要求。
In order to seek the main girder with better aerodynamic performance of Maputo Bridge, three schemes proposed by design are adopted, and the combination of wind tunnel test and numerical calculation is used to obtain the critical wind speeds and flutter critical wind speeds of the three schemes. The static and dynamic stability of each girder is analyzed. The results of the static wind stability show that the static wind instability forms of the three main girders show the coupling of bending and torsion. The static wind stability of the composite girder is the best, and the static wind response is also small. The flutter test results show , The flutter stability of the three main beams are not satisfied, and the flutter stability of the steel box composite beam is relatively better. The flutter requirements can be satisfied by setting horizontal baffles on the steel box composite beams.