| Earthquakes are natural disasters, which seriously endangers the safety of human life and property , in 2008 the 5.12 Wenchuan earthquake has caused huge loss of life and property. As one of the lifeline projects in highway projects, bridge has played a very important role in the earthquake relief and reconstruction process.The arch bridge is a widely used type of bridge structure in our country (especially the southwest region), many arch bridges in earthquake-prone areas. Generally speaking, concrete arch bridges have poor ductility performance, and factors affecting the seismic performance of more, and national seismic bridge current study focused on the many specific seismic engineering analysis, the study about parameters of the system are less.For in this paper, ribbed arch bridge as an example , focus on the following questions have been studied:1. The characteristic research of ribbed arch bridge seismic response.Take two ribbed arch bridges that have unequal spans as example,and to build the finite element models respectively.First of all to study the power characteristics of the ribbed arch bridges,and then to analysis the earthquake response of ribbed arch bridges under multi-dimensional motivations by using response spectrum method and time-history analysis method.2. Effect to ribbed arch bridges'earthquake responds by foundation elasticity.To build the ribbed arch bridge finite element model that having elastic foundation, and study the effect to arch bridges'power characteristics by foundation elasticity,then to analysis the effect to ribbed arch bridges'earthquake responds by foundation elasticity by using response spectrum method and time interval analysis method.3. Study of damping control of ribbed arch bridges'lateral structure. In view of the problem that ribbed arch bridges lateral structure have poor anti-seismic performance, sets the crosswise damping braces in ribbed arch bridge, then to analysis the earthquake responds both before and after damping control by using time history analysis method, the results show that the damping brace has a good damping effect. |
