Parametrican alysis for seismic pounding responses of a skewed simply-supported girder bridge
WANG Junwen1,WU Tianyu1,YAN Jukao2
1.Key Laboratory of Roads, Railway Engineering Safety Control of Ministry of Enucation, Shijiazhuang TieDao University, Shijiazhuang 050043, China;
2. Structural Health Monitoring and Control Institute, Shijiazhuang TieDao University, Shijiazhuang 050043, China
To study seismic pounding responses of a skewed simply-supported girder bridge(SSGB), a refined dynamic calculation model considering effects of longitudinal impact and friction between girder and abutment, and transverse impact between girder and retainer for SSGB was built with the open style seismic simulation software OpenSees. The effects of horizontal direction ground motion, vertical ground motion and skew degree on the seismic pounding responses of SSGB were analyzed. The results indicated that if neglecting the transverse pounding effect, the maximum longitudinal displacement of the girder bridge end and the peak rotation angle of the superstructure for SSGB with the skew degree α reach their minimum values when the input direction of horizontal ground motion is θ=90°-α; if considering the transverse pounding effect, the maximum longitudinal displacement and the peak rotation angle decrease because the retainer can limit effectively the displacement of the superstructure; the vertical ground motion has a certain impact on the values of the seismic pounding responses, but has no obvious impact on the responses change law versus skew degree; the uplift forces of bearings in obtuse angle zone increase, those in acuteangle zone decrease with increase in skew degree, and those decrease from obtuse angle zone to acute angle zone; considering the effect of input direction of horizontal ground motion, the maximum value of the longitudinal displacement of the girder bridge end increases with increase in skew degree, the peak rotation angle of the superstructure and the maximum longitudinal pounding force firstly increase and then decrease with increase in skew degree， the maximum transverse pounding force between girder and retainer changes less with increase in skew degree.
[1] Ghobarah A A. Seismic analysis of skewed highway bridges with intermediate supports [J]. Earthquake Engineering and Structural Dynamics, 1974, 2(3): 235 -240.
[2] 叶爱君. 桥梁抗震[M]. 北京: 人民交通出版社, 2011.
YE Ai-jun. Seismic design of bridges[M]. Beijing: China Communications Press, 2011.
[3] 庄卫林, 刘振宇, 蒋劲松. 汶川大地震公路桥梁震害分析及对策[J]. 岩石力学与工程学报, 2009, 28(7): 1377-1387.
ZHUANG Wei-lin, LIU Zhenyu, JIANG Jingsong. Earthquake-induced damage analysis of highway bridges in Wenchuan earthquake and countermeasures [J]. Chinese Journal of Rock Mechanics and Engineering, 2009, 28(7): 1377-1387.
[4] Maleki S. Deck modeling for seismic analysis of skewed slab-girder bridges[J]. Engineering Structures, 2002, 24(10): 1315-1326.
[5] MENG J Y, LUI E M. Seismic analysis and assessment of a skew highway bridge [J]. Engineering Structures, 2000, 22(11): 1433-1452.
[6] Abdel-Mohti A, Pekcan G. Assessment of seismic performance of skew reinforced concrete box girder bridges [J]. International Journal of Advanced Structural Engineering, 2013, 5(1): 1-18.
[7] 卓秋林. 公路简支斜梁桥地震反应分析［D］. 福州:福州大学, 2004.
ZHUO Qiulin. Seismic response analysis of simply -supported skew highway girder bridges［D］. Fuzhou: Fuzhou University, 2004.
[8] 何健, 叶爱君. 连续斜交梁桥地震下碰撞效应分析[J]. 中南大学学报: 自然科学版, 2012, 43(4): 1475-1481.
HE Jian, YE Ai-jun. Seismic response of continuous skew bridges with pounding effects [J]. Journal of Central South University: Science and Technology, 2012, 43(4):1475-1481.
[9] 卢明奇, 杨庆山, 李英勇. 地震作用下斜交连续梁桥碰撞效应分析[J]. 中国矿业大学学报, 2012, 41(2):289-292.
LU Ming-qi, YANG Qing-shan, LI Ying-yong. Collision effect analysis of skew continuous bridge under seismic response [J]. Journal of China University of Mining & Technology, 2012, 41(2):289-292.
[10] 王军文, 沈贤, 李建中. 地震作用下斜交简支梁桥旋转机理及斜度影响研究[J]. 桥梁建设, 2014, 44(3):32-37.
WANG Jun-wen, SHEN Xian, LI Jian-zhong. Study of rotation mechanism and skew degree influence of skewed simply-supported beam bridge under earthquake excitation [J]. Bridge Construction, 2014, 44(3):32-37.
[11] Yashinsky M., Oviedo R., Ashford S., Fargier-Gabaldon L., and Hube M. Performance of highway and railway structures during the February 27, 2010 Maule Chile earthquake [R].EERI/PEER/FHWA Bridge Team Rep., http://peer.berkeley.edu/events/pdf/2010/bppr4.pdf(Apr. 23, 2011)
[12] 王军文, 吴天宇, 李少华 等. 斜交简支梁桥纵向地震碰撞反应精细化研究[J]. 振动与冲击（已录用）
[13] Konstantinidis D, Makris N. Seismic response analysis of multidrum classical columns [J]. Earthquake Engineering and Structural Dynamics, 2005, 34(10):1243–1270.
[14] 肖建庄, 赵卫平. 高温后高强混凝土与轧制钢板黏结剪切强度和摩擦系数[J]. 建筑材料学报, 2012, 15(5): 697-702.
XIAO Jian-zhuang, ZHAO Wei-ping. Shear bond strength and friction coefficient between high-strength concrete and rolled steel plate after elevated temperatures exposure [J]. Journal of building materials, 2012, 15(5):697-702.
[15] 范立础, 聂利英, 李建中. 地震作用下板式橡胶支座滑动的动力性能分析[J]. 中国公路学报, 2003, 16(4): 30-35.
FAN Li-chu, NIE Li-ying, LI Jian-zhong. Dynamic characteristic analysis of laminated rubber bearing sliding under earthquake [J]. China Journal of Highway and Transport, 2003, 16(4): 30-35.
[16] 王常峰, 陈兴冲. 竖向地震动对桥梁结构地震反应的影响[J]. 振动与冲击, 2007, 26(6): 31-35, 181.
WANG Chang-feng, CHEN Xing-chong. Effect of vertical excitation on seismic performance of continuous bridge[J]. Journal of Vibration and Shock, 2007, 26(6): 31-35, 181.
