武汉阳逻长江大桥施工猫道抗风稳定性分析

研究了武汉阳逻长江大桥施工猫道在极限风荷载下的稳定性及动力稳定性。采用悬索桥的静风稳定公式计算了猫道静风失稳临界风速,设计超松驰迭代法进行了猫道静风失稳的非线性有限元分析验算,并估算了该猫道颤振临界风速。计算分析表明,该猫道的静、动力抗风稳定性满足要求,并据此提出了三种工程抑振措施。

Analysis of Wind-resistant Stability on the Catwalk of Wuhan Yangluo Yangtze River Bridge

This paper studied the statical and dynamical wind stability of the catwalk of Wuhan Yangluo Yangtze River Bridge under ultimate wind speed. The minimum statical divergence speed of the catwalk in the construction phase was calculated by using the statical wind stability formula of suspension bridges. Nonlinear finite element checking computation on the critical divergence speed of the catwalk was performed by developing superslack iteration method. The critical flutter velocity of the catwalk was appraised.It indicated that both its statical and dynamical windresistant stability could meet the specified requirement via analyzing the catwalk's design by means of theoretical method and nonlinear finite element numerical analysis method,respectively.Three kinds of reasonable windresistant measures were proposed.