模数式桥梁伸缩缝固有频率及结构参数灵敏度分析

发布时间：2018-01-19 14:24

本文关键词： 桥梁工程模数式桥梁伸缩缝有限元法灵敏度固有频率　出处：《公路交通科技》2014年03期 　论文类型：期刊论文

【摘要】：为更全面地了解模数式桥梁伸缩缝动态响应,以ZL480模数式桥梁伸缩缝为研究对象,应用ANSYS软件建立其参数化模型,分析改变横梁间距BHK、中梁支撑刚度K2和缝宽B等参数对其固有频率和灵敏度的影响。研究结果表明:当横梁间距BHK从1 m增加到2 m,间距增加100%,第1阶固有频率ω1减小了32.6%;中梁支撑刚度K2从40 000 N/mm增加到100 000 N/mm,刚度增加了150%,第1阶固有频率ω1增加了24%;随横梁间距BHK的减小、横梁下支撑刚度K4、中梁支撑刚度K2、中梁刚度K1的增大,模数式桥梁伸缩缝固有频率逐渐增大,且灵敏度依次降低;缝宽B及横梁刚度K3的改变对其固有频率影响不大。
[Abstract]:In order to understand the dynamic response of the expansion joints of modular bridges more comprehensively, taking the expansion joints of ZL480 modular bridges as the research object, the parameterized model of the expansion joints of modular bridges is established by using ANSYS software, and the BHK of changing the spacing between beams is analyzed. The influence of supporting stiffness K2 and seam width B on the natural frequency and sensitivity of the beam is studied. The results show that the spacing increases by 100% when the BHK of the beam is increased from 1 m to 2 m. The first order natural frequency 蠅 1 decreases 32.6m; The support stiffness K2 increased from 40 000 N / mm to 100 000 N / mm, the stiffness increased 150 times, and the first order natural frequency 蠅 1 increased by 24%. With the decrease of BHK, the support stiffness K _ 4, K _ 2 and K _ 1 increase, and the natural frequency of expansion joint increases gradually, and the sensitivity decreases in turn. The changes of joint width B and beam stiffness K 3 have little effect on their natural frequencies.
【作者单位】：西南交通大学机械工程学院;
【基金】：中央高校基本科研业务费专项资金项目(2010ZT03)
【分类号】：U443.31
【正文快照】： 0引言桥梁伸缩缝是为了满足桥面变形需要,使车辆能够平稳地通过桥面,在桥面伸缩接缝处设置的伸缩装置[1-2]。模数式伸缩缝最大缝宽可达80 mm,且结构简单、安装方便,被广泛应用于桥梁结构中[3-5]。国内学者研究了桥梁伸缩缝对桥梁主体结构的影响[6-7],而针对模数式桥梁伸缩缝(M

【参考文献】