钢筋混凝土空心高墩振动特性分析
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摘要
为研究钢筋混凝土空心高墩在不同壁厚情况下振动特性的变化规律,引入壁厚系数,推导出模态频率与壁厚系数的函数关系。利用Abaqus有限元软件分别建立了24组钢筋混凝土空心高墩实体模型和线单元模型,运用Lanczos算法提取结构前三阶顺桥方向的模态频率,并与理论模型的计算值对比分析。结果显示:当墩高、截面形式一定时,随着壁厚系数降低,钢筋混凝土空心高墩的质量大幅度减少,结构的模态频率仅小幅度提高。
In order to study the variation of vibration characteristics of reinforced concrete hollow high piers under different wall thickness,wall thickness coefficient is introduced and the functional relationship between modal frequency and wall thickness coefficient is deduced. 24 groups of solid and line element models of reinforced concrete hollow high piers are established by using Abaqus finite element softw are. The modal frequencies of the first three orders along the bridge direction are extracted by Lanczos algorithm,and are compared with the calculated values of the theoretical model. The results are shown as following: when the pier height and section form are fixed,the mass of reinforced concrete hollow high pier decreases greatly and the modal frequency of the structure increases slightly with the decrease of wall thickness coefficient.
In order to study the variation of vibration characteristics of reinforced concrete hollow high piers under different wall thickness,wall thickness coefficient is introduced and the functional relationship between modal frequency and wall thickness coefficient is deduced. 24 groups of solid and line element models of reinforced concrete hollow high piers are established by using Abaqus finite element softw are. The modal frequencies of the first three orders along the bridge direction are extracted by Lanczos algorithm,and are compared with the calculated values of the theoretical model. The results are shown as following: when the pier height and section form are fixed,the mass of reinforced concrete hollow high pier decreases greatly and the modal frequency of the structure increases slightly with the decrease of wall thickness coefficient.
引文
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[12]杨旭东,孙栋,裔黔,等.基于ABAQUS的龙门框架振动特性分析[J].制造业自动化,2012,34(8):107-109.
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[2]杨洒.基于OpenSees的钢筋混凝土空心桥墩抗震性能的研究[D].邯郸:河北工程大学,2015.
[3]MANDER John Barrier. Seismic design of bridge piers[D].Christchurch:The University of Canterbury,1983.
[4]ZAHN Franz August. Design of reinforced concrete bridge columns for strength and ductility[D]. Christchurch:The University of Canterbury,1985.
[5]LEHMAN D,MOEHLE J,MAHIN S,et al. Experimental evaluation of the seismic performance of reinforced concrete bridge columns[J]. Journal of Structural Engineering,2004,130(6):869-897.
[6]申彦利,赵雪.钢筋混凝土空心桥墩抗震性能分析[J].广西大学学报(自然科学版),2014,39(1):48-53.
[7]傅志方,华宏星.模态分析理论与应用[M].上海:上海交通大学出版社,2000.
[8]韩宜丹,淳庆.南京长江大桥桥头堡大堡风振性能研究[J].特种结构,2018,35(4):92-99.
[9]杨维博,王座林.矩形深水空心桥墩与实体桥墩的振动特性分析[J].吉林水利,2014(1):15-18.
[10]李喆,毛毳.模态分析中钢筋混凝土桥墩的简化模型[J].天津城市建设学院学报,2009,15(3):180-183.
[11]石亦平,周玉蓉. Abaqus有限元分析实例详解[M].北京:机械工业出版社,2006.
[12]杨旭东,孙栋,裔黔,等.基于ABAQUS的龙门框架振动特性分析[J].制造业自动化,2012,34(8):107-109.
[13]徐稼轩,郑铁生.结构动力分析的数值方法[M].西安:西安交通大学出版社,1993.