论文部分内容阅读
随着悬索桥跨径的不断增大 ,抗风稳定性成为控制桥梁设计与施工的最主要因素 .尤其是在施工初期 ,结构的刚度比成桥要低得多 ,使得颤振临界风速最低 ,更容易发散 .通过对主梁非对称拼装顺序以及采用临时的水平交叉加劲措施等方法的研究 ,讨论如何提高桥梁施工过程的颤振临界风速 .分析结果表明 ,当主梁采用非对称施工时 ,会有效提高结构的等效质量 ,从而提高临界风速 .当采用水平交叉索时 ,结构的抗扭刚度显著增加 ,同样增强了桥梁施工过程中的抗风稳定性
As the span of suspension bridge increases, the stability of wind resistance becomes the most important factor to control the design and construction of the bridge, especially in the early stage of construction, the stiffness of the structure is much lower than that of the bridge, so that the critical wind speed of flutter is the lowest It is easy to diverge.The discussion on how to improve the flutter critical wind speed during the bridge construction process is made through the research on asymmetrical assembling sequence of the main beam and the temporary horizontal cross stiffener.The analysis results show that when the main beam is asymmetrical construction, Improve the equivalent mass of the structure and thus increase the critical wind speed.When the horizontal cross-catenary is adopted, the torsional stiffness of the structure increases significantly, which also enhances the stability of the wind during the construction of the bridge