摘要
为了研究单箱多室波形钢腹板PC组合梁桥动力特性,参照南昌市朝阳大桥非通航孔桥,制作了三跨单箱两室PC连续波形钢腹板试验梁,并对模型桥和实桥进行动力测试。分别利用自互功率谱法和传递率法对动力特性进行分析,识别了试验梁前四阶模态参数和实桥前七阶模态参数;同时利用ANSYS程序建立实桥和模型桥的有限元分析模型,并进行动力特性分析;研究结果表明,除因实桥两幅之间横向工字钢连接,导致实桥理论和实测扭转1阶频率相差较大外,实桥各阶理论与实测频率相差较小,振型一致;试验梁低阶频率理论值与实测值能较好吻合。研究设计制作的波形钢腹板缩尺试验梁及测试结果正确,试验梁能较好体现实桥动力特性;传递率法可较好识别该类桥梁结构的模态参数。
To study the dynamic characteristics of a multi-cell single-box continuous b o x girder bridge with corrugated steel webs , a scale-size test m o d e l beam w a s set u p b a s e d o n a non-navigable s p a n bridge of C h a o y a n g Bridge in Nanchang Jiangxi province. The m o d a l analysis m e t h o d s of cross-power s p e c t r u m density m e t h o d a n d transmissibility method were used to analyze the model beam a n d the real bridge. T h e first four order m o d a l parameters of the m o d e l b e a m and the first seven order modal parameters of the real bridge w e r e identified; T h e software A N S Y S w a s u s e d to build u p the spatial finite element model of the model beam a n d the real bridge a n d analyze their d y n a m i c characteristics. C o m p a r e d the test results and finite e l e ment calculation results of the real b r i d g e, the error w a s small a n d vibration m o d e s w e r e consistent, excepted for the first order torsional vibration of the real b r i d g e, b e c a u s e the d e n s e b e a m s b e t w e e n the south bridge and the north bridge were equipped to c onnect the two b ridges, w h i c h led to the big errors. C o m p a r e d the test results and finite element calculation results of the m o d e l beam , the error was small at low frequencies. The m e t h o d s to set up the model beam and modal analysis results were effective, and at the s a m e time the transmissibility m e t h o d could b e precise to identify the modal parameters of a bridge with corrugated steel webs.
作者
陈水生
张超
桂水荣
CHEN Shuisheng ZHANG Chao GUI Shuirong(School of Civil Engineering and Archi tecture,East China Jiaotong University,Nanchang 330013 ,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2017年第12期122-127,共6页
Journal of Vibration and Shock
基金
国家自然科学基金(51468018
51268013)
江西省自然科学基金项目(20114BAB216008
20122BAB206004)
江西省教育厅科研项目(GJJ14384
GJJ14352)
关键词
波形钢腹板
单箱多室
模型实验
动力特性
模态分析
corrugated steel webs
multi-cell single- b o x
m o d e l e x p e r i m e n t
d y n a m i c characteristic
m o d a l analysis
