Seismic Response Analysis Of Huilan Ramp Bridge In Mianzhu

With the development of transport and people's aesthetic consciousness, more and more curved bridge need to be builded. In the event of an earthquake, more and more problems of damage of the curve bridge are arised in the new roads, rebuilt roads and urban roads. In this dissertation, the cuvred bridge with small curvature reradius is researched. A number of dynamic and seismic characteristics of the curved bridge are studied. Some conclusions to guide the design of the small curvature curved bridge are obtained. Specific contents are as follows:(1) Vibration mode shapes, period, frequency of HuiLan Bridge are simulated and analyzed with finite element beam element model.With discussions of mode contribution ratios, the reasonable number of modes of small curvature curved girder bridge is founded in the seismic analysis.(2) HuiLan Bridge is analyzed with single and two-dimensional response spectrum. By changing the angle of seismic waves in the single-dimensional response spectrum analysis, the most disadvantaged angle and the most negative value of bending moment, shear are founded in the analysis. The single dimensional response spectrum results is contrasted in different modes combinations.By using two orthogonal response spectrum and changing the angle of seismic waves,the bridge is analyzed with two-dimensional response spectrum. The two-dimensional response spectrum results are contrasted in different space combination of SRSS and 30% principle. The single and two-dimensional response spectrum results are contrasted in the most disadvantaged angle.(3) HuiLan Bridge is analyzed with single and two-dimensional Time-History analysis method. By using design response spectrum and random phase angle method, artificial seismic waves are generated. The single-dimensional Time-History analysis results are contrasted in two artificial seismic waves. By changing the angle of seismic waves in the single-dimensional Time-History analysis, the most disadvantaged angle and the most negative value of bending moment, shear are founded in the analysis. The single dimensional Time-History analysis results are compared with the single dimensional response spectrum results. The single dimensional Time-History analysis results are contrasted in the different seismic waves. By using two orthogonal seismic waves and changing the angle of seismic waves,the bridge is analyzed with two-dimensional Time-History analysis method. The single dimensional Time-History analysis results are compared with the two-dimensional Time-History analysis results. The two-dimensional Time-History analysis results are contrasted in the different seismic waves. Two methods are used to find the most disadvantaged angle and the most negative value in the single and two-dimensional Time-History analysis.The results in the two methods are contrasted.(4) The HuiLan Bridge dynamic characteristics is analyzed before earthquake and after bridge reinforcement. The reasons of differdnt seismic analysis results before and after bridge reinforcement is finded out.