The Seismic Performance Analysis Of Bridge-Building Composite System

As the advance of modern transportation process and rapid economic development, the pressure coming from urban transportation and urban space is also increasing with time.The use of bridge-building composite system,not only meet the higher functional and structural requirements of bridges,but also relieves the pressure on urban transportation and space.However, in recent years, earthquakes occurred frequently.View from the relate of seismic data, the study to the seismic performance of bridge-building composite system is still insufficient.At the same time, there is no specific specifications to guide the design. Therefore, using a actual project as the subject matter of study, this paper calculated and analyzed the dynamic behavior and seismic response of the bridge by finite element analysis software Midas/civil.The main work is completed and summarized as follow:(1Establishing the dynamic analysis model of the bridge.It is got by response spectrum analysis that the displacement and internal forces of the bridge under earthquake.The bridge has good seismic performance and is reliable under earthquake.(2)The displacement and internal force of the bridge under the earthquake is mainly along the earthquake direction,and the influence on the orthogonal direction is relatively small.(3)Through the comparison and analysis of the seismic response of bridge-building composite system between traditional covered bridge,it is got that composited structure is good for transverse moment, shear and torque resistance,but may work to the disadvantage of pier axial force.(4) The seismic response between bridge-building composite systems with different building structures is compared. The longitudinal stiffness mutation of upper building structure will make the pier moment increased significantly, while increases the arch transverse moment.(5)The results of response spectrum analysis and time-history analysis are compared. Although the overall results are close, the time-history analysis is more accurate and comprehensive. Therefore, the two methods can be checked mutually to improve reliability.