中文摘要：

由于定量分析中存在诸多的不确定性因素,大跨度拱桥需要重视抗震概念设计。给出了国内外大跨度拱桥的典型震害并进行了成因分析。从工程场地选择、合理的桥梁结构体系和布置方案等方面探讨了大跨度拱桥抗震概念设计的总体要求。从采用高强材料、提高整体延性、设置赘余构件与设置多道抗震防线方面给出了大跨度拱桥避免地震脆性破坏的设计原则。基于雅鲁藏布江大桥,提出了主要构件与次要构件的划分方法及设计原则,阐述了拱肋选材、主梁布置、横撑及辅助墩的概念设计,给出了应用减隔震技术、具有多道抗震防线及结构分层次延性破坏的抗震概念设计方法。

英文摘要：

The qualitative conceptual design should pay attention to for long-span arch bridges, because there are many uncertainties in the quantitative seismic response analysis. The typical earthquake damage and the cause of the damage for long span arch bridges are presented at home and abroad. The general requirements of conceptual seismic design for long-span arch bridge are discussed from the aspects of engineering site selection, reasonable bridge structure system and layout scheme and foundation form. The design principles avoiding brittle failure for long span arch bridges are given from the use of high strength materials, improving the overall ductility, setting up redundancy elements and multi seismic defense lines. Based on the Yalu Tsangpo River Bridge, partition method and design philosophy are proposed for main components and secondary members. Selection of arch rib, the layout of stiffening girder, the design of transverse brace and auxiliary pier are expounded. The seismic concept design method is given, which are applying isolation technology, possessing the multi-channel seismic line and the struc- tural ductility damage.