Lightweight Steel Roof Span Values Of Wind

New home and abroad in recent years widespread use of large-scale public places span roof structure, especially in the country is now in full swing in the high-speed railway construction, the majority of its stations are used without column Canopy light steel roof span. General use of such structures and long span steel structure, roof and external walls with a steel plate, aluminum curtain wall and other lightweight materials, light weight, stiffness of small features, makes the structure more flexible, making the wind-sensitive structures . Wind resistant design for such structures, we must first obtain accurate wind load, and wind load are two important parameters, one is wind load shape coefficient, and the other is wind load wind load factors. For wind load shape coefficient, load code on the parameters of our specific provisions, but the complexity of the building size and load specifications in the shape factor has been difficult to meet the actual situation. Wind load factor for wind load, load code for the complex structure of China Wind load factor did not give the corresponding figures and calculations. Especially for such a large span, light construction, wind load is usually the vertical control of load, wind load parameters may lead to ill-considered structure of wind-resistant design chosen not safe, and even affect the normal operation of rail transit systems; if the light of experience, take a more conservative parameter values, may cause unnecessary waste. In this paper, the new railway from Guangzhou to Zhuhai (including Zhongshan, Jiangmen are) inter-city rapid rail transit project "- Jiangmen Station as an example to discuss the value of such structural wind load problems.In order to quantify and evaluate these impacts, often for building models of the wind tunnel dynamic pressure measurement to obtain the wind load test shape coefficient, the dynamic response analysis by wind-induced vibration to determine the wind load wind load factors. Dynamic Pressure test in simulated atmospheric boundary layer to fully consider the circumstances surrounding buildings and other important factors, given the wind load shape coefficient, and for the envelope around the facade, roof structure and roof design calculation wind load; wind vibration response analysis using the dynamic finite element software Ansys, the experimental data based on dynamic pressure measurement, dynamic wind loads acting on the main structure of process analysis, given the design for the main structure of wind vibration coefficient of wind load.This article compares the approximation to calculate the wind load and wind load in the experimental wind vibration coefficient shape factor distribution, distribution range of maximum and minimum air pressure difference between the proposed wind-resistant design of such structures when the number of matters requiring attention. And of the wind on the train station, the internal structure of the impact of issues to be studied further.