体外预应力对混凝土箱梁动力特性的影响分析  

Analysis of Effects of Externally Prestressed Tendons on Dynamic Property of Concrete Box Girder

作　　者：郑尚敏 程海根[1] 万水[2] ZHENG Shang-min;CHENG Hai-gen;WAN Shui(East China Jiaotong University,Nanchang,Jiangxi 330013,China;Southeast University,Nanjing,Jiangsu 210096,China)

机构地区：[1]华东交通大学,南昌330013 [2]东南大学,南京210096

出　　处：《铁道工程学报》2018年第7期36-40,共5页Journal of Railway Engineering Society

基　　金：国家自然科学基金项目(50078014);交通运输部科研项目(2011-318-775-680);华东交通大学高层次人才科研启动项目(2003417007)

摘　　要：研究目的:为研究体外预应力对单箱双室混凝土箱梁动力特性的影响,本文通过推导混凝土箱梁在体外预应力作用下的自振频率计算公式,以一根单箱双室混凝土试验梁为研究对象,利用ANSYS建立体外预应力混凝土箱梁的有限元数值分析模型,并对其进行模态分析。通过试验梁模型试验、理论计算以及有限元分析相结合的方法来研究体外预应力对单箱双室混凝土箱梁自振频率的影响,并研究体外预应力钢束面积以及拉力对其自振频率的影响。研究结论:(1)通过实测数据与计算值以及有限元分析数据进行对比分析,表明了理论公式推导的适用性,有限元模型的合理性;(2)体外预应力钢束面积的变化对混凝土箱梁的自振频率影响较明显;(3)体外预应力拉力的大小对混凝土箱梁的自振频率影响较小;(4)本研究成果可为体外预应力单箱双室混凝土箱梁动力特性的分析提供一定的参考。Research purposes： In order to research the influence of externally prestressed tendons on the dynamic property of a concrete girder with single box double room（ CGBR）,the calculation formula for vibration frequency of the concrete box girder is deduced. Based on a experimental concrete box girder with double room single box,a finite element model is established by finite element（ FE） analysis software ANSYS for modal analysis. The dynamic testing,theoretical calculating and finite element analyzing are combined to research the effects of externally prestressed tendons on the vibration frequency of CGBR. Parameters analysis are used to research the influence of the size of the cross-sectional area and the magnitude of the prestressing force on vibration frequency of CGBR.Research conclusions：（ 1） The datum between test measured and FE analysis show that there is little difference,which proves that the test datum is correct,and the FEA method is reasonable.（ 2） The change of size of the cross-sectional area of externally prestressed tendons has obvious effect on the vibration frequency.（ 3） The magnitude of the prestressing force has little effect on the vibration frequency.（ 4） The research results can provide some references for dynamics analysis on double room single box concrete girder with externally prestressed tendons.

关 键 词：体外预应力 单箱双室 模态分析 动力性能 自振频率 

分 类 号：TU378.2[建筑科学—结构工程] TU311.3