大跨度桥梁抗震体系研究

Advances in earthquake resisting systems for long-span bridges

我国基础设施建设重点正逐渐向西部转移,为确保高烈度地震区大跨度桥梁的抗震安全性,本文重点针对大跨度的抗震体系发展现状与未来趋势开展研究.系统总结了大跨度斜拉桥和悬索桥各种纵横向抗震体系的减震机理、优缺点及影响规律等共性问题.虽然我国的大跨度桥梁的技术发展和工程应用在中等强度及以下地震条件下的大跨度桥梁抗震体系研究上积累了丰富的成果,但在近断层和跨断层等极端地震作用下的大跨度桥梁减震机理和减震体系上的研究还很少,相关的减震理论和设计方法也有待完善.

The demand for the construction of infrastructure is being transferred to the West of China.To ensure the seismic safety of new longspan bridges in the area of high seismic activity,the state of the art earthquake-resisting systems for long-span bridges are investigated and further developed.The common issues of the isolation mechanism,advantages and disadvantages,and influence of practical earthquake resisting systems are summarized.During the recent development of practical applications of long-span bridges,many approaches and techniques have been developed for such bridges with moderate seismic risks.However,there are few studies(as well as the corresponding design theory and specifications)on earthquake-resisting systems for appropriate long-span bridges with extremely high seismic risks(e.g.,near-fault or cross-fault conditions).