Analysis Of Temperature Effect Of Railway Pretressed Concrete Low-pylon Cable-stayed Bridge With Probability Statistics

Low-pylon cable-stayed bridges are widely used in various places at home and abroad due to advantages such as simple construction technology and beautiful structure.The temperature effect is significant on the bridge construction phase and the bridge formation phase.However,there are few studies on the temperature effect of railway prestressed concrete low-pylon cable-stayed bridges.The temperature effect has a significant impact on the bridge,resulting in an excessive offset of bridge bearings,concrete temperature cracks,and other issues,which seriously affect the durability and safety of the bridge.To design the temperature monitoring scheme and measure the box girder and stay cable on site for a long time,to systematically study the temperature effect of railway prestressed concrete low-pylon cablestayed bridge in construction stage and completion stage under the action of temperature,with a low-pylon cable-stayed bridge in Guangdong as the research object.Contents of this thesis are as follows:(1)To sort out the research status of bridge temperature effect at home and abroad,and summarize the existing research deficiencies.(2)To design the temperature monitoring scheme,measure the box girder and stay cable on site for a long time,study the temperature field characteristics of the low-pylon cablestayed bridge,and obtain the temperature field model suitable for the low-pylon cable-stayed bridge in Guangdong with a railway prestressed concrete low-pylon cable-stayed bridge in Guangdong as the research object;(3)The method of calculating the temperature load standard value of the railway prestressed concrete Low-pylon cable-stayed bridges during the service period was developed based on probabilistic statistical theory.A real-time temperature monitoring and analysis system software for concrete slash bridge was developed based on measured data and probability statistics theory,which helps to handle large quantities of measured data efficiently.Fast fitting of representative bridge temperature field,improving efficiency;(4)The model of the construction stage and bridge stage was established by the use of finite element software based on the measured temperature data.The different temperature fields of the Low-pylon cable-stayed bridges construction stage and bridge stage were analyzed via loading the model of the overall warming and cooling,cable-beam temperature difference,temperature gradient specification,and measured values.