【摘要】 利用有限元通用软件ANSYS,对一中承式钢筋混凝土拱桥进行了结构自振特性的数值模拟分析,求出了自振频率、振型等动力参数,对其模态特征进行了描述,并通过变换拱桥的主要结构参数对比分析了它们对结构自振特性的影响。结果表明:自振频率随矢跨比的减小略有提高;横撑有助于增强拱肋的横向刚度,减小拱肋面外振动,提高抗风稳定性;各振型的自振频率值随拱肋刚度的提高近似成线性增大,可以通过改变拱肋刚度来调整其自振特性。研究结果可以为同类桥梁的抗震设计提供参考。更多还原

【Abstract】 Using the Generic-software ANSYS,numerical simulation analyzing on the dynamics characteristic of a Half-through reinforced concrete arch bridge is done.Its self-vibration parameters such as self-vibration frequencies,modes and so on,are given,as well as its modes characteristics are summarized.Besides,influence of the main structure parameters to the self-vibration characteristic is analyzed by varying these parameters of the arch bridge.The results show that self-vibration frequencies increase with rise/span ratio decrease;transverse support will help to enhance the lateral rigidity,reduce its out arch-plane vibration,and improve the stability in wind;the frequency of each vibration mode is increased with a approximate linearity with improvement of arch stiffness.So we can change arch stiffness to adjust its vibration characteristics.The results can offer reference to the seismic design of the similar bridge.更多还原