Study On Collision Of Ice Loads On Bridge Piers In Cold Regions

The temperature in the area above 35° north latitude is low,and the low temperature makes the river in the ice-sealing period for a long time.In the spring,it will be prone to the phenomenon of sputum,which will cause a large number of ice platoons in rivers and lakes located in cold regions.When the moving ice row hits the pier,it will impact the pier,causing the pier to vibrate.Multiple collisions of ice row will cause skin cracking,spalling and easy formation of cracks in the pier concrete.The long-term existence of this problem will lead to insufficient bearing capacity of the bridge and pose a serious threat to the safety of the bridge.Therefore,it is particularly necessary to study the characteristics of the ice row and the impact of the ice row on the pier.In this paper,the complex process of ice row and pier impact is expounded,and the action law and influencing factors of ice load in this process are studied.The specific contents are as follows:1)Explain the research status of the effects of ice rafts on structures at home and abroad,and introduce the physical properties and mechanical properties of ice.2)Using ANSYS/LS-DYNA finite element software to establish the pier and ice row model,simulate the collision process between ice row and pier,and solve the key problems involved in the calculation process and contact type.Define the nonlinear contact between the ice row and the pier,and achieve the failure and failure of the ice row during the impact process through the failure criterion.3)Through the numerical simulation results,analyze the impact force of the ice row on the pier,the stress time history curve at different positions of the pier and the time history curve of the pier top displacement,summarize the stress variation law of the icerow and the pier during the collision process,and analyze the ice row in the collision.The form of destruction in the process.4)On this basis,the effects of ice row strength,ice row thickness and other factors on the collision force are further discussed.The piers with anti-ice vertebral bodies are analyzed,and the influence of ice cone angle on the collision force is further discussed.