轻型墩桥梁横向振动检测与加固研究  

Test of Lateral Vibration of Light Pier Bridge and Study of Reinforcement

作　　者：张文学[1] 陈树礼[2] 苏木标[2] 

机构地区：[1]同济大学,上海200092 [2]石家庄铁道学院,石家庄050043

出　　处：《铁道工程学报》2007年第3期37-39,20,共4页Journal of Railway Engineering Society

摘　　要：研究目的:铁路提速后,大部分轻型墩桥梁横向振幅过大,墩与梁横向刚度不匹配问题十分突出,严重地影响了行车安全,为研究该类桥梁横向振幅过大的原因,提出合理的加固方案,特进行轻型墩桥梁横向振动的检测与加固研究。研究方法:以某轻型墩铁路桥梁为研究对象,进行了车-桥耦合振动现场检测及分析,进而提出了2种加固方案,并进行了加固效果分析。研究结果:该桥T梁自身跨中横向振幅基本满足规范要求,但各墩顶横向振幅均严重超限。研究结论:轻型墩横向刚度偏低、墩顶横向振幅过大是导致该类桥梁横向振幅过大的主要原因,本文提出在双柱式墩柱之间增设型钢剪力撑或增设两道横向劲性型钢连接并浇筑微膨胀钢筋混凝土,2种加固方案均能有效地提高轻型墩的横向刚度,控制轻型墩桥梁的横向振幅。Research purposes： After train speed - up, majority of transverse vibration amplitude of light pier bridges exceed allowance value. The mismatching problem exits between light pier and beam markedly, which influences the safety of train running badly. In order to learn the cause for large lateral vibration amplitude and find out the reasonable reinforcing methods, test of lateral vibration of light pier bridge and study of reinforcement were done. Research methods： Taking a light pier bridge as a test object, transverse coupled vibration of vehicle - bridge detection was done on site and the analysis was made. Moreover, two reinforcing methods were proposed and the reinforced effect was analyzed. Research results： The transverse vibration amplitude of T beam of tested bridge basically met the requirements of criterion. But the transverse amplitude on the top of light pier exceeded allowance much. Research conclusions ：The main causes for large lateral transverse vibration amplitude of pier are that the piers＇ lateral rigidity is too low and large lateral transverse vibration amplitude on the pier＇s top. The lateral rigidity of light pier could be increased effectively and greatly and lateral transverse vibration amplitude of light pier could be controlled by adopting two reinforcing methods proposed in this paper that the sectional shear force is added between distyle pier posts or the connection is added by two rows of lateral stiffness section steel and expansive concrete is grouted.

关 键 词：轻型墩 横向振动 车桥耦合振动 检测 加固 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]