【摘要】 对于超大跨度钢管混凝土拱桥,由于受模型缩尺比所限,通常在气弹模型试验中不能单独模拟出拱肋中单根钢管的刚度,目前常采用集中刚度法用一个芯棒模拟整个钢管桁架的刚度。由于芯棒的位置只能放置在钢管桁架的形心处,因此模型中芯棒的存在必然破坏结构的气动外形,使得模型的气动外形不能满足与实桥气动外形成相似关系。基于以上原因,提出了一种试验与理论分析相结合的修正方法,对外形改变给试验结果带来的影响进行理论分析,从而获得修正系数对试验结果进行修正。更多还原

【Abstract】 In the design of aeroelastic model of long-span concrete-filled steel tube arch bridge, the method of using an equivalent mandril to simulate the stiffness of whole arch rib is mainly used at present. Due to the presence of mandril, the aerodynamic shape of the model is changed. For this reason, a correctional method is presented to correct the windage caused by the presence of mandril based on the combined application of theoretical analysis and model test, and the test results are corrected by using the correctional coefficient obtained by the method.更多还原