Abstract：In order to solve the problem of collision between adjacent decks or beam and pier of railway simply-supported girder bridges(SSGB) with unequal spans under earthquake, which is easy to cause the damage of expansion joint and transition pier, and even cause the girders to fall off, aiming at ovecoming the limitation of traditional damping devices, a new shock absorption system combined of buckling-restrained brace (BRB) and cable restrainer is developed based on the function separation idea. On the basis of the description of the structural form and working principle of the combined shock absorption system, its mechanical model was established. Then the system was applied to the railway SSGB with unequal spans, and the dynamic elastic-plastic numerical model of the bridge considering collisions was established by OpenSees, and the damping mechanism of the system was studied. Finally, the influences of initial stiffness, starting threshold of BRB and expansion joint gap on its seismic performance were analyzed systematically. The results showed that the combined shock absorption system can effectively control the longitudinal seismic response of girders and transition pier, significantly improve the overall seismic performance of SSGB; the greater the initial stiffness of BRB, the greater the reduction of relative displacement of adjacent decks; the starting threshold of BRB should be reasonably selected according to the gap between expansion joints, and more attention should be paid to cable restrainer in design; when the gap of expansion joint is greater than 5 cm, the damping effect of the system is better.
白维刚1,2，王军文2,3，邢晨鹏2，彭涛2，郭进2,4. 铁路不等跨简支梁桥组合减震系统减震机理及影响参数研究[J]. 振动与冲击, 2022, 41(2): 208-216.
BAI Weigang1,2,WANG Junwen2,3,XING Chenpeng2,PENG Tao2,GUO Jin2,4. Damping mechanism and influential parameters of a hybrid shock absorption system for railway simply-supported girder bridges with unequal spans. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(2): 208-216.
[1] 中华人民共和国铁道部. GB50111-2006 铁路工程抗震设计规范[S]. 北京: 中国计划出版社, 2009.
[2] 黄勇, 张良, 车泽鑫, 等. 多铅芯橡胶支座水平力学性能研究[J]. 土木工程学报, 2018, 51(S2): 54-61.
HUANG Yong, ZHANG Liang, CHE Zexin, et al. Study on the horizontal mechanical properties of multi-core lead rubber bearings[J]. China Civil Enginnering Journal, 2018, 51(S2): 54-61.
[3] 陈彦江, 郭凯敏, 李勇, 等. 桥梁高阻尼隔震橡胶支座性能试验研究[J]. 振动与冲击, 2015, 34(09): 136-140.
CHEN Yanjiang, GUO Kaimin, LI Yong, et al. Behavior of high damping seismic isolation rubber bearings for bridges[J]. Journal of Vibration and Shock, 2015, 34(09): 136-140.
[4] 刘彦辉, 谭平, 周福霖, 等. 高墩隔震连续梁桥地震模拟振动台试验[J]. 中国公路学报, 2015, 28(02): 60-68.
LIU Yanhui, TAN Ping, ZHOU Fulin, et al. Shaking table test for seismic simulation of continuous isolation girder bridge with high piers[J]. China Journal of Highway and Transport, 2015, 28(02): 60-68.
[5] 赵继栋, 张永亮, 陈兴冲, 等. 基于粘滞阻尼器的高墩大跨铁路连续刚构桥减震研究[J]. 世界地震工程, 2016, 32(2): 93-99.
ZHAO Jidong, ZHANG Yongliang, CHEN Xingchong, et al. Research on seismic reduction of tall-pier and long-pan railway continuous rigid-framed bridge based on viscous damper[J]. World Earthquake Engineering, 2016, 32(2): 93-99.
[6] 项乃亮, 李建中. 非规则梁桥横向X形弹塑性阻尼器合理参数分析[J]. 同济大学学报(自然科学版), 2015, 43(07): 980-986.
XIANG Nailiang, LI Jianzhong. Analysis of transverse X-shaped elastic-plastic damper’s proper parameters on irregular girder bridges[J]. Journal of Tongji University(Natural Science) , 2015, 43(07): 980-986.
[7] 李冀龙, 欧进萍. X形和三角形钢板阻尼器的阻尼力模型(Ⅰ)—基于双线性本构关系[J]. 世界地震工程, 2004(01): 10-16.
LI Jilong, OU Jinping. Damping force hysteresis loop models for X type and triangle mild steel dampers(I)—Based on double linear constitutive model[J]. World Earthquake Engineering, 2004(01): 10-16.
[8] 张文元, 李姝颖, 李东伟. 菱形开洞软钢阻尼器及其在结构减震中的模拟分析[J]. 世界地震工程, 2007, 23(1): 151-155.
ZHANG Wenyuan, LI Shuying, LI Dongwei. Simulation analysis on hysteretic behavior and vibration suppression of the mild steel damper with the diamond-shaped opening and added damping and stiffness[J]. World Earthquake Engineering, 2007, 23(1): 151-155.
[9] ZHANG C, AOKI T, ZHANG Q, et al. Experimental investigation on the low-yield-strength steel shear panel damper under different loading[J]. Journal of Constructional Steel Research, 2013, 84(84): 105-113.
[10] 徐艳红, 李爱群, 黄镇. 抛物线外形软钢阻尼器试验研究[J]. 建筑结构学报, 2011, 32(12): 202-209.
XU Yanhong, LI Aiqun, HUANG Zhen. Experimental study of mild steel dampers with parabolic shape[J]. Journal of Building Structures, 2011, 32(12): 202-209.
[11] 邓雪松, 纪宏恩, 张文鑫, 等. 开孔板式屈曲约束支撑拟静力滞回性能试验研究[J]. 土木工程学报, 2015, 48(01): 49-55.
DENG Xuesong, JI Hongen, ZHANG Wenxin, et al. Quasi-static cyclic tests on hysteretic behavior of a perforating plate buckling-restrained brace[J]. China Civil Enginnering Journal, 2015, 48(01): 49-55.
[12] 陈士通, 张文学, 杜修力, 等. 连续梁桥锁死销减震机理及影响参数研究[J]. 工程力学, 2016, 33(02): 74-80.
CHEN Shitong, ZHANG Wenxue, DU Xiuli, et al. Damping mechanism and effect parameters analysis of locking dowel for continuous bridges[J]. Engineering Mechanics, 2016, 33(02): 74-80.
[13] 孟兮, 高日, 李承根. 铁路简支梁桥中减震榫的设计及其减震性能研究[J]. 桥梁建设, 2014, 44(03): 81-86.
MENG Xi, GAO Ri, LI Chenggen. Design and seismic mitigation performance study of shock absorber for railway simply-supported beam bridge[J]. Bridge Construction, 2014, 44(03): 81-86.
[14] Desroches R., SUSENDAR M. Effect of pounding and restrainers on seismic response of multiple-frame bridges[J]. Journal of Structural Engineering, 2002, 128(7): 860-869.
[15] GUO A, ZHAO Q, LI H. Experimental study of a highway bridge with shape memory alloy restrainers focusing on the mitigation of unseating and pounding[J]. Earthquake Engineering & Engineering Vibration, 2012, 11(2): 195-204.
[16] SAIIDI M S, JOHNSON R, MARAGAKIS E M. Development shake table testing and design of FRP seismic restrainers[J]. Journal of Bridge Engineering, 2006, 11(4): 499-506.
[17] CHOI E, PARK J, YOON S J, et al. Comparison of seismic performance of three restrainers for multiple-span bridges using fragility analysis[J]. Nonlinear Dynamics, 2010, 61(1): 83-99.
[18] SHRESTHA B, HAO H, BI K. Effectiveness of using rubber bumper and restrainer on mitigating pounding and unseating damage of bridge structures subjected to spatially varying ground motions[J]. Engineering Structures, 2014, 79: 195-210.
[19] 黄泰烈, 朱敏, 曹凌飞, 等. 桥梁地震碰撞机理和抗震设计建议[J]. 高速铁路技术, 2015, 06(03): 17-21.
HUANG Tailie, ZHU Min, CAO Lingfei, et al. Mechanism of seismic collision on bridges and aseismic design suggestions[J]. High Speed Railway Technology, 2015, 06(03): 17-21.
[20] 王军文, 白维刚, 刘丽杰, 等. 一种基于BRB技术的组合式多级抗震桥梁防碰撞和落梁装置[P]. 2020-05-29, 中国, ZL 201811073817.6.
[21] 王军文, 李建中, 范立础. 限位装置对连续梁桥地震反应的影响[J]. 铁道学报, 2008, 30(03): 71-77.
WANG Junwen, LI Jianzhong, FAN Lichu. Effects of restrainers on seismic responses of continuous beam bridges[J]. Journal of the China Railway Society, 2008, 30(03): 71-77.
[22] 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, 2016, 35(08): 194-200.
WANG Junwen, WU Tianyu, LI Shaohua, et al. Refined study on longitudinal seismic pounding responses of simply supported skewed girder bridge[J]. Journal of Vibration and Shock, 2016, 35(08): 194-200.
[23] 王东升, 冯启民, 王国新. 基于直杆共轴碰撞理论的桥梁地震反应邻梁碰撞分析模型[J]. 工程力学, 2004, 21(2): 157-166.
WANG Dongsheng, FENG Qimin, WANG Guoxin. Analysis model of pounding between adjacent bridge girders during earthquakes based on collinear impact between rods[J]. Engineering Mechanics, 2004, 21(2): 157-166.
[24] AASHTO Guide Specifications for Seismic Isolation Design(3rd Edition)[S]. Washington, D.C. ：American Association of State Highway and Transportation Officials，
