Analysis Of Temperature Field And Temperature Effect Of Long-span Cable-stayed Bridge

In recent years,with the development of science and technology,bridge engineering has achieved rapid progress.There are many novel bridge structure forms in people’s field of vision.A new type of bridge with both cable-stayed bridge and continuous girder bridge characteristics has emerged,and that is the low-tower cable-stayed bridge.The stress characteristics and structural form of the prestressed concrete continuous beam bridge and the prestressed concrete cable-stayed bridge are comprehensively applied to the low-tower cable-stayed bridge.The low-tower cable-stayed bridge has excellent structural performance and good landscape effect.It has been more and more widely used in the world,showing great potential for development.However,the design research of the low-tower cable-stayed bridge is basically based on the theoretical research of the existing continuous girder bridges and traditional cable-stayed bridges,and there is a lack of targeted relevant research.This article takes the completed Nanao Bridge as the background of the actual bridge project.The main beam side midspan ratio,the main beam stiffness ratio,the length of the cableless zone next to the tower,the length of the midspan middle cableless zone,and the side span edgeless cable The length of the zone and the height of the cable-free zone at the bottom of the tower are appropriately adjusted within a certain reasonable range to study its variation and influence range.Hope to provide assistance for the design of low-tower cable-stayed bridges of the same type and similar design parameters.The article first briefly describes the development history of low-tower cable-stayed bridges at home and abroad and the research status of low-tower cable-stayed bridges.The structural and mechanical characteristics of the low-tower cable-stayed bridge are summarized.The definition of low-tower cable-stayed bridge is described.Combining the design data of domestic and foreign low-tower cable-stayed bridges,the development prospects of low-tower cable-stayed bridges are described.Then,with the real bridge project as the background,the finite element analysis software Midas / Civil2019 was used.Establish the bridge structure model under the original design situation,briefly explain each step in the bridge modeling process,and analyze the force of the model.Finally,based on the original model of the bridge.By regularly changing the bridge’s main beam side and mid-span ratio within a reasonable range,the main beam stiffness ratio,the length of the cable-free zone next to the tower,the length of the mid-span cable-free zone(the length of the edge-free cable-free zone),and the bottom of the tower These design parameters of the cable zone height establish different finite element models.After analyzing and summarizing the calculation results of these finite element models,it is concluded that the low-tower cable-stayed bridge has different effects on the low-tower cable-stayed bridge by changing the mid-span ratio,main beam stiffness,cable-free zone length,and tower-span ratio of the low-tower cable-stayed bridge.