钢拱塔斜拉桥动力特性影响参数分析  

Analysis of Influence Parameters on Dynamic Characteristics of Cable-stayed Bridge with Steel Arch Tower

作　　者：杨志魁 YANG Zhi-kui(Shaanxi Vocational and Technical College,Xi'an,Shaanxi 710100,China)

机构地区：[1]陕西职业技术学院,陕西西安710100

出　　处：《黑龙江交通科技》2022年第1期64-67,71,共5页Communications Science and Technology Heilongjiang

摘　　要：为研究钢拱塔斜拉桥的参数对其动力特性的影响。以西安富裕路沣河大桥(钢拱塔斜拉桥)为工程背景,分析了结构自重、刚度、有无纵向水平索、索力大小对该类桥梁动力特性的影响。其结果表明:自振频率随结构自重增加而逐渐减小,主梁自重对桥梁自振频率影响较大,钢拱塔自重次之,拉索自重影响最小。桥梁自振频率随结构刚度增大而逐渐增大,当刚度系数达到2之后,增长趋势趋于平缓;拉索刚度与主梁刚度对主梁竖向弯曲振型影响较大,钢拱塔刚度对拱塔横漂振型影响较大。钢拱塔之间的纵向水平索对桥梁的低阶频率影响较小,对高阶频率有影响;纵向水平索增加了桥梁的整体稳定性。斜拉索索力的变化对该桥梁的自振频率影响不大。To study the influence of the parameters of the cable-stayed bridge with steel arch tower on its dynamic characteristics.The Fenghe bridge(steel arch tower cable-stayed bridge)on Fuyu Road in Xi'an is the background of the project.The influence of the parameters,such as structural weight,rigidity,absence of longitudinal horizontal cables,cable force on the dynamic characteristics of the cable-stayed bridge with steel arch tower is analyzed.The results show that the natural frequency gradually decreases with the increase of the structural weight.The weight of the main girder has the greatest influence on the natural frequency of the bridge,followed by the weight of the steel arch tower,and the weight of the cable is the smallest.The natural frequency of the bridge increases gradually with the increase of the structural stiffness.When the stiffness coefficient reaches 2,the growth trend tends to be gentle.The cable stiffness and the main girder stiffness have a greater influence on the vertical bending mode of the main girder,and the steel arch tower stiffness has a greater impact on the transverse drift mode of the arch tower.The longitudinal horizontal cables between the steel arch towers have little effect on the low-order frequencies of the bridge and have an impact on the high-order frequencies;the existence of the longitudinal horizontal cables increases the overall stability of the bridge.The change of stay cable force has little effect on the natural frequency of the bridge.

关 键 词：钢拱塔斜拉桥 动力特性参数 有限元模型 桥梁工程 

分 类 号：U442[建筑科学—桥梁与隧道工程]