摘要
利用有限元通用软件ANSYS,对一座中承式钢筋混凝土拱桥进行了结构动力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动力特性的影响.计算结果表明,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.这些研究结果可以为同类桥梁的抗震设计提供参考.
By using Generic -software ANSYS, numerical simulation analyzing has been done to the dynamics characteristic of a half- through reinforced concrete arch bridge, and the dynamic parameters such as self -vibration frequencies, modes etc, are gotten, as well as its modes characteristics . Meanwhile, influence to the structure - dynamics characteristic was analyzed by varying primary structural parameters of the arch bridge. The results show that self- vibration frequencies have a marginal improvement with rise/span ratio decreased. The transverse support will help to enhance the lateral rigidity, to reduce its out arch -plane vibration and improve the stability in wind. The frequency of each vibration mode has been increased in a approximate linearity with the improvement of arch stiffness, and arch stiffness can be changed to adjust its vibration characteristics. The results can offer reference to seismic design of the similar bridge .
出处
《河南理工大学学报（自然科学版）》
CAS
2009年第2期175-179,共5页
Journal of Henan Polytechnic University（Natural Science）
关键词
中承式混凝土拱桥
自振特性
矢跨比
横撑
拱肋刚度
half-through reinforced concrete arch bridge
self-vibration characteristics
rise/span ratio
transverse support
rigidity of arch rib
