摘要
选取在役某系杆拱桥进行动力试验研究,试验主桥跨径布置为(55+260+55)m,采用刚拱柔梁体系,拱肋为主承重结构。在试验桥梁梁端、1/8跨、1/4跨、1/2跨、3/4跨、7/8跨处布置横向和竖向传感器,分别进行了脉动试验和强迫振动试验研究。通过现场试验和试验结果分析,得到了桥梁的自振频率、振型、阻尼比等特性。试验结果表明,试验桥梁自振频率等特性满足要求,不管是脉动试验还是强迫振动试验,桥梁均是安全的。
Dynamic test was done on one tied arch bridge with the span of( 55 + 260 + 55) m. Steel arch and flexible beam system was adopted and the arch rib is the main load-bearing parts. Pulsating and forced vibration test were carried out of the horizontal and vertical sensors arranged on the span of 1 /8,1 /4,1 /2,3 /4,7 /8 and the beam ends. From the field experiments and results analyses,it shows that the natural frequencies,modes,modal damping ratio and other characteristics were obtained. The results indicate that the natural vibration characteristics meet the requirements.Whether it is forced or pulsating vibration,the bridge is safe.
出处
《建筑结构》
CSCD
北大核心
2016年第S1期537-541,共5页
Building Structure
关键词
系杆拱桥
动力试验
自振频率
振型
阻尼比
tied arch bridge
dynamic test
natural frequency
mode
modal damping ratio
