| With the development of China's economic and urbanization during the past 30 years of reform and opening up,the government's investment in infrastructure is growing.Especially in the bridge engineering,more and more bridges that attract global attention have been started or put into use in recent years.With the rapid development of the bridge,the safety of the bridge has been paid more and more attention.Because of the importance of the bridge to the traffic and people's life,the accidents of bridge are often concerned by the society and the media.In many bridge engineering accidents,part of them is due to a large area heap near the bridge that is on the soft ground.The main work of this paper is as follows:1.The three-dimensional model of bridge and foundation is established in ABAQUS to simulate the site situation at the time of the accident.The transverse displacement,bending moment and axial force along the depth direction of the bridge were analyzed.The ultimate bearing capacity is compared and the reason of the bridge failure is obtained.2.In ABAQUS,the three-dimensional model of the heap with different heights and different distance,foundation soil with different soil parameters were established.The stress of piers and the piles after changing the parameters of these models were analyzed,and the influence of different factors on the bridge was compared.3.On the basis of these research,the single factor sensitivity analysis is used to analysis the curvature of the piers and the piles with different influencing factors,The sensitivity of these factors was calculated by sensitivity coefficient and sensitivity slope method.4.The solid element in ABAQUS is used to simulate the structure of the bridge.Model with single pile is established.The concrete of the bridge is defined as the plastic damage model to analysis the damage of single pile with large area heap to verify the actual situation of bridge damage. |
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