摘要
为便于计算半漂浮体系斜拉桥的竖弯频率,以无辅助墩的半漂浮斜拉桥为研究对象,利用瑞莱法推导了1阶反对称和正对称竖弯振动频率估算公式,最后利用实际工程算例对此公式的准确性进行验证.研究结果表明:不同约束条件决定了斜拉桥竖弯基频主要影响参数,且计算结果偏差很大,应准确模拟半漂浮斜拉桥的边界条件;推导获得的竖弯基频实用估算公式的计算结果与有限元值相对误差为13.91%,低于《公路桥梁抗风设计规范》推荐公式的计算结果,而推导的1阶反对称估算公式可以作为公路桥梁抗风设计规范的相关推荐公式,为半漂浮斜拉桥初期概念设计提供更为精确的估算公式.
To calculate vertical frequency of half-floating system cable-stayed bridge conveniently,the half-floating system cable-stayed bridge without auxiliary pier was taken as research object. Frequency formulas for first anti-symmetric and symmetric vertical vibration modes were deduced by Rayleigh method. The presented theoretical formulas were verified by the engineering project. The results indicate that constraint condition has great influence on vertical frequency to determine the main influence parameters of frequency,and it should be correctly considered in frequency calculation. The error between values calculated by the proposed formulas and the finite element method is 13. 91%,which meets the precision requirement of conceptive design. The proposed formulas can be applied to the half-floating system cable-stayed bridge without auxiliary pier,and the vertical frequency formula in the wind-resistant design specification can be applied to the half-floating system cable-stayed bridge.
出处
《江苏大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2016年第4期467-472,共6页
Journal of Jiangsu University：Natural Science Edition
基金
国家自然科学基金资助项目(50908017
51408040)
云南省交通运输厅科技项目(云交科2013(A)02)
山西省科技攻关项目(20150313014-2)
关键词
斜拉桥
桥梁工程
竖弯频率
估算
实用公式
cable-stayed bridge
bridge engineering
vertical frequency
estimation
practical formulas
