现浇及装配式超高墩连续刚构桥碰撞响应及其影响试验  

Experimental Research on Pounding Response and Influence on Seismic Performance of CSHP-B and PSHP-B

作　　者：王瑾[1] 许维炳[2] 杜修力[2] 白少聪 周大兴 侯立群 李进 孙玉龙 WANG Jin;XU Wei-bing;DU Xiu-li;BAI Shao-cong;ZHOU Da-xing;HOU Li-qun;LI Jin;SUN Yu-long(School of Water Resources and Hydropower Engineering,North China Electric Power University,Beijing 102206,China;College of Architecture and Civil Engineering,Beijing University of Technology,Beijing 100124,China;China Railway Construction Group Co.Ltd.,Beijing 100040,China)

机构地区：[1]华北电力大学水利与水电工程学院,北京102206 [2]北京工业大学建筑工程学院,北京100124 [3]中铁建设集团有限公司,北京100040

出　　处：《中国公路学报》2024年第9期68-82,共15页China Journal of Highway and Transport

基　　金：国家自然科学基金项目(52108428,52178446);北京市自然科学基金项目(8232001);中央高校基本科研业务费专项资金项目(2023MS067)。

摘　　要：现浇及灌浆套筒连接装配式超高墩连续刚构桥(CSHP-B、PSHP-B)具有显著的高柔特性,二者地震诱发碰撞及其影响尚不明晰。鉴于此,设计制作了缩尺比为1/20的主桥和边联模型桥,通过振动台试验探究了非长周期地震动、长周期非脉冲型地震动、近断层脉冲型地震动作用下CSHP-B和PSHP-B主桥与引桥碰撞响应及其影响。结果表明:考虑碰撞后,CSHP-B及PSHP-B主梁(墩顶)峰值位移有所减小,而边联主梁(墩顶)峰值位移有所增加;PSHP-B的主梁(墩顶)峰值位移比CSHP-B大,且PSHP-B主梁峰值位移减小率(-8.6%~-19.8%)以及边联峰值位移增长率(+6.9%~+17.5%)均更大。CSHP-B、PSHP-B主桥与边联峰值碰撞力和碰撞次数随激励强度的增加而增加,且近断层脉冲型地震动激励下碰撞次数相对较少;与CSHP-B相比,PSHP-B的峰值碰撞力更大且碰撞次数更少。碰撞会增加高阶振型对2类主桥主梁位移响应的影响,减小二者的墩底纵筋峰值应变和峰值弯矩(曲率),且对PSHP-B的损伤发展影响更大。Continuous rigid-frame bridges with cast-in-place or prefabricated super-high piers with grouted sleeve connections(CSHP-B or PSHP-B)exhibit significantly high flexibility.The earthquake-induced pounding and its influence on the seismic performances of CSHP-B and PSHP-B remain unclear.In this study,1/20-scaled models of a CSHP-B and PSHP-B and relevant adjacent approach model bridges were designed and manufactured.Subsequently,shaking table tests were conducted regarding the pounding response and its relevant influence on the seismic performances of the CSHP-B and PSHP-B under excitations of non-long-period ground motions,non-pulse-like long-period ground motions,and near-fault pulse-type(NFPT)ground motions.The experimental results show that when considering pounding,the peak displacements of the main beams(pier top)of the CSHP-B and PSHP-B decreased,while the relevant peak displacements of the adjacent bridge model increased.Moreover,considering pounding,the peak displacements of the main beams(pier top)of the PSHP-B are larger than those of the CSHP-B;the decreasing and increasing ratios of the peak displacements of the PSHP-B(-8.6%--19.8%)and adjacent model bridge(+6.9%-+17.5%)are both higher.The peak pounding force and pounding number between the PSHP-B or CSHP-B and the adjacent model bridge both increase with increasing excitation intensity.However,the pounding number between the main bridge and the adjacent model bridge decreased under the excitations of the NFPT ground motions.In addition,compared with the CSHP-B,the peak pounding force and pounding number between the PSHP-B and the adjacent model bridge are relatively larger and smaller,respectively.Furthermore,when considering pounding,the influence of the high-order modes on the displacement response of the main beams increases,while the strain and moment responses of the pier bottoms decrease,and the development of the damage mode of PSHP-B changes more significantly.

关 键 词：桥梁工程 超高墩连续刚构桥 振动台试验 相邻联碰撞 高阶振型 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]