体外预应力对波形钢腹板箱梁自振频率的影响分析  

Analysis on effects of externally prestressed tendons on vibration frequency of box girder with corrugated steel webs

作　　者：郑尚敏[1] 马磊[1] 万水[1] 

机构地区：[1]东南大学交通学院,南京210096

出　　处：《东南大学学报（自然科学版）》2014年第1期140-144,共5页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(50078014);交通运输部科研资助项目(2011-318-775-680)

摘　　要：为了研究体外预应力对波形钢腹板箱梁动力特性的影响,推导了波形钢腹板箱梁在体外预应力作用下的自振频率计算公式.以5.2 m缩尺波形钢腹板试验梁为对象,利用有限元软件ANSYS建立了预应力波形钢腹板箱梁的模型,对其进行了模态分析.通过对试验梁模态试验的自振频率测试数据与理论计算值以及有限元分析数据进行对比,证明了理论公式推导的正确性,论证了有限元模型的适用性.采用理论计算和有限元数值计算相结合的方法,研究了体外预应力钢束拉力、锚固位置以及截面积对波形钢腹板自振频率的影响.研究结果表明:三者对波形钢腹板箱梁自振频率的影响均较小,在实际工程中可以忽略体外预应力对波形钢腹板箱梁动力特性的影响.In order to research the influence of externally prestressed tendons on the vibration fre- quency of a box girder with corrugated steel webs, the calculation formula for vibration frequency of the box girder with corrugated steel webs is deduced. Based on a 5.2 m reduced scale experimental box girder model with corrugated steel webs, a finite element model is established by finite element analysis software ANSYS for modal analysis. The datum of dynamic testing, theoretical calculating and finite element analyzing verify the correctness of the proposed formula and the applicability of fi- nite element model. The theoretical calculation and the finite element analysis is combined to re- search the influence of the magnitude of the prestressing force, the anchor position and the size of the cross-sectional area on the vibration frequency of the box girder with corrugated steel webs. The re- suits show that all mentioned factors have little influence on the vibration frequency of the box girder with corrugated steel webs. And in the practical engineering, the influence of externally prestressed tendons on dynamic characteristics of the box girder with corrugated steel webs can be neglected.

关 键 词：波形钢腹板 动力性能 自振频率 模态分析 预应力钢束 

分 类 号：TU398[建筑科学—结构工程]