中承式钢筋混凝土拱桥自振特性分析
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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。
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.
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.
引文
[1]张正权.刚架拱桥的受力分析与加固[D].杭州:浙江大学,2006.
[2]奉龙成,罗小华.钢筋混凝土拱桥面内极限承载力的非线性分析[J].土木工程学报,2002,7:20-24.
[3]汪斌,陈志忠,蔡敏.混凝土拱桥静载试验及仿真分析[J].工程与建设,2006:181-183.
[4]项海帆,刘光栋.拱结构的稳定与振动[M].北京:人民交通出版社,1991.
[5]苏军,高大峰.中国木结构古建筑抗震性能的研究[J].西北地震学报,2008.30(3):239-244.
[6]冯仲仁,李彩霞,吴刚刚.下承式钢管混凝土拱桥自振特性的有限元分析[J].武汉理工大学学报,2005,28(7):50-54.
[7]李国豪.桥梁结构稳定与振动[M].北京:中国铁道出版社,1992.
[2]奉龙成,罗小华.钢筋混凝土拱桥面内极限承载力的非线性分析[J].土木工程学报,2002,7:20-24.
[3]汪斌,陈志忠,蔡敏.混凝土拱桥静载试验及仿真分析[J].工程与建设,2006:181-183.
[4]项海帆,刘光栋.拱结构的稳定与振动[M].北京:人民交通出版社,1991.
[5]苏军,高大峰.中国木结构古建筑抗震性能的研究[J].西北地震学报,2008.30(3):239-244.
[6]冯仲仁,李彩霞,吴刚刚.下承式钢管混凝土拱桥自振特性的有限元分析[J].武汉理工大学学报,2005,28(7):50-54.
[7]李国豪.桥梁结构稳定与振动[M].北京:中国铁道出版社,1992.
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