Study On Wind Load Characteristics And Wind-Resistant Design Method Of Long-Span Roof Structures

It is generally the first choice for large-scale airport, station and gymnasium to use long-span roof structures with high flexibility, low damping and mass. Wind loading is usually a dominated one acting on structures, so it is the most important factor to judge the safety of structure under wind load accurately. However there is no general method of calculating wind load in the code because of configuration difference of long-span roof structures. In the other hand the shape coefficient and the gust response coefficient suggested by the code can't embrace all forms of long-span structures, so it is necessary to analyze and discuss the wind resistance character of different long-span structures in depth.Based on the stiff model of long-span structure in Qingdao railway station, wind tunnel test is carried out and finite element model is established, this paper discusses the structure's response for the wind and the structure's safety by analyzing the wind pressure distribution character, confirming the gust response coefficient, and exerting the static wind load.The second chapter of this paper discusses the distribution of mean wind pressure coefficients and fluctuating wind pressure coefficients in different areas of the roof, typical points for analyzing are selected, the regularity of wind pressure distribution is summarized, and partition wind pressure coefficients are obtained.The third chapter discusses the computing method of wind responsive. After a series of conversion and amendment, the nodes'fluctuating wind load history-time can be gotten from the measured wind pressure coefficient history-time, and the partition values of gust response coefficient are discussed by analyzing the first ten vibration modes, finally, the unified gust response coefficient of the whole roof is got, which is prepared for the next step of loading the static wind load.The forth chapter analyzes the response for static wind load on the roof, two different loads loading on the structure are selected, and the former two chapters'data are chosen and screened, then the carrying capability and deformation for the combined steel column of each rank under the dead load only and combination of the dead load and the wind load are confirmed, the maximum stress and deformation are chosen to compare with the code, finally the structure's safety is assessed.Finally, the further structure design and analysis are suggested, the conclusions of this paper can be referred to the structure's design and construction, particularly for similar long-span roof structures.