Analysis Of Seismic Response And Research On The Seismic Isolation Bearing Of Single Slanted Pylon Cable‐stayed Bridge

In recent two decades, accompanied with the rapid growth of domestic economy,the city’s construction also develop rapidly. And large populations gathered in the city.People’s dependence on the city traffic became stronger.Single slanted pylon cable-stayed bridge as a new type bridge, because of itsreasonable structure，best use of various materials and beautiful shape, it get more andmore attention in the industry. It certainly will be the major choice of urban bridge.But the single slanted pylon cable-stayed bridge exist late and the practical applicationof this bridge is still less. The researches on earthquake resistance and seismicisolation measures of single slanted pylon cable-stayed bridge are absent, especiallythe seismic isolation measures. In recent years, earthquake happened frequently athome and the damaged bridges showed the catastrophic consequences after theearthquake. No more need is urgent like the analysis of earthquake resistance of singleslanted pylon cable-stayed bridge and the research on seismic isolation measures. Andthe study also may provide some suggestions for the design of this bridge.This paper sees a city single slanted pylon cable-stayed bridge as engineeringbackground. Through using the software Midas/Civil to build the spatial finiteelement model of the bridge, analyzing the structural dynamic characteristics andseismic responses of bridge and checking the design seismic isolation bearing. Themain research jobs and contents are as follows:(1)Use Midas/Civil to build the spatial finite element model of a city highwaysingle slanted pylon cable-stayed bridge. Considering both the effect of pile and soiland rigid foundation to calculate the natural vibration characteristics of bridge andanalyze the result.(2)Then designing correct response spectrum and choosing the reasonable recordearthquake wave. Analyze bridge’s seismic responses under rare earthquakes by usingthe response spectrum method and time history analysis method. Contrasting twomethods and providing the data support to the analysis of seismic isolation bearing.(3)To simulate the two design seismic isolation bearings which called pot rubberbearing and steel spherical bearing by using the delay system in Midas/Civil. Contrastthe bridge’s internal force and deformation by adding seismic isolation bearings or not.Check the strength performance of bridge pylon and main tower pier. And evaluate the effect of two seismic isolation bearings.(4)Contrasting the seismic responses of the bridge which using the seismicisolation measures or not. The conclusions are as follows: The bridge pylon and maintower pier suffers most loads and the rest suffered by the abutment piers is too small.Even if the internal forces of abutment piers are reduced by using two seismicisolation bearings, there is no effect to the whole structure. The internal forces ofbridge pylon and main tower pier are not improved. So it is no use increasing thekinetic energy of main beams to consume the seismic energy by using seismicisolation bearings on the abutment piers.