摘要
对湟水河大桥的现场检测表明此桥已成为一座“危桥”,但主拱肋结构仍具有一定的承载能力.根据检测结果提出了加固方案,推荐方案为将原双曲拱桥结构变为肋拱桥结构,增大了边拱肋的截面尺寸并增设横梁,加固后使该桥由原汽-13级荷载提高到了公路Ⅱ级荷载的通行标准.分别按反应谱理论和线性时程反应理论计算其在地震作用下的响应.由分析可知,采用此加固方案能使该桥满足设计抗震要求.
The field measurement of Huangshui river bridge indicates that it has been a dangerous bridge, but the arch ribs still have enough bearing capacity. The blueprint of reinforcement has been put forward according to the result of the field measurement. Our suggestion is changing the form of double-curvature into rib arch,meanwhile enhancing the section of side arch and adding some cross beams. After the reinforcement,the capacity of this bridge can enhance from standard highway load auto-13 to highway load II. Its response to seism has been analyzed by the response spectra method and the linear history method. From them,we can know that the bridge will be safety to seism after the reinforcement.
出处
《兰州交通大学学报》
CAS
2006年第6期87-89,共3页
Journal of Lanzhou Jiaotong University
基金
国家自然科学基金资助项目(503780436)
兰州交通大学"青蓝"人才工程基金资助项目
关键词
拱桥
加固
谱分析
时程分析
arch-bridge
reinforcement
response spectrum analysis
time history analysis
