Design And Research Of Python-based Calculation Program For Detailed Static Wind Load Of Bridge Structure

At this stage,the equivalent static gust load of bridge structures is calculated according to the provisions of the Code for Wind-resistant Design Specification for Highway Bridges(JTG/T 3360-01-2018),and the calculation process needs to consult drawings and codes constantly,and the calculation amount of equivalent static gust load of variable cross-section structures is huge,and the whole calculation process is quite complicated.In order to reduce the calculation difficulty of engineers and improve the calculation efficiency,the code puts forward simplified calculation methods for the reference height of main girder components and pier components.Based on the timeconsuming and shortcomings of the simplified calculation method of equivalent static gust load,this thesis puts forward a refined calculation method of equivalent static gust load based on the actual component size and actual terrain height of each unit,and designs and develops an interactive program based on Python language,Py Side2 and MIDAS Civil calculation software.After the development,the program is tested and applied to the calculation of equivalent static gust load of bridge structure,which greatly reduces the calculation workload and saves a lot of time,and even engineers who are unfamiliar with the calculation of equivalent static gust load can operate the program.Finally,the program calculation results are compared with the equivalent static gust load simplified according to the Code for Wind-resistant Design Specification for Highway Bridges(JTG/T 3360-01-2018)without considering the wind load,and the response of the equivalent static gust load to the bridge structure is studied.The main research contents and achievements of this thesis are as follows:(1)A program for calculating the refined equivalent static gust load of bridge structure is compiled.Based on each unit in MIDAS Civil structural model and the actual terrain,the program calculates the parameters such as the reference height and the size of the components.Compared with the traditional simplified calculation,the calculation efficiency is improved by dozens of times.In this thesis,a rigid-frame bridge and a superlarge steel-concrete composite beam cable-stayed bridge are tested.The efficiency is improved by 16.6 times and 47.1 times,and the accuracy and accuracy are guaranteed.The designer can save a lot of calculation and loading time in the calculation of MIDAS Civil equivalent static gust load,which realizes the convenience and efficiency of equivalent static gust load loading,and the calculation results reflect the reliability of the design program.(2)In this thesis,the bridge responses under the conditions of W1 wind action level and W2 wind action level without considering the wind load,simplified calculation of wind load according to the Code for Wind-resistant Design Specification for Highway Bridges(JTG/T 3360-01-2018),refined calculation of wind load by program,and refined calculation of wind load by program without considering the additional torque correction are compared and studied.It is found that the equivalent static gust load in the transverse direction displaces the bridge structure along the bridge direction and vertically.Usually,the transverse wind load is applied to the main girder unit without considering the load on the transverse stress center of the main girder,thus generating additional torque,which has little influence on the bending moment of the main girder and great influence on the torque of the main girder;At the level of W1 wind,the wind load is simplified according to the Code for Wind-resistant Design Specification for Highway Bridges(JTG/T 3360-01-2018).This thesis thinks that it is conservative and uneconomical to design the bridge structure according to the Code for Wind-resistant Design Specification for Highway Bridges(JTG/T 3360-01-2018)at the level of W1 wind.Under the action level of W2 wind,this thesis verifies that the difference between the simplified calculation of wind load according to the Code for Wind-resistant Design Specification for Highway Bridges(JTG/T 3360-01-2018)and the refined calculation of wind load according to the actual terrain is relatively small.