The Wind Load Simulation And Distribution Features Of Large-span Roof Structure

Large span roof structure is developing rapidly in recent years, new forms, the geometric shape is complicated, big span, light weight, belong to the wind sensitive structure. And structure of surrounding wind flow around is very complex, often accompanied by downdrafts hit, the phenomenon such as separation, attached again, vortex shedding, and formulate often assume that no longer applies, cannot be used for wind flow load characteristics describe wind load on the surface of the structure characteristics, therefore need to surface wind load of large span roof structure features in-depth analysis, to establish its real wind load description model, to guide the actual structure of wind resistance design. Current people for large-span roof structure surface wind load characteristics research mainly concentrated in the wind tunnel experiment and CFD numerical simulation of two kinds of methods, with the continuous improvement of computer technology, especially the rapid development of computational fluid dynamics theory, using the computer to complex long-span roof structure surface wind load numerical simulation is more and more easy to implement. In this paper, based on the national natural science fund project of Considering the characteristics of turbulent typical large-span roof structure wind load description and wind resistance analysis of fine(51278314).This article detailed work and conclusions are as follows:(1)Introduces the domestic and foreign for large-span roof structure and the research status of wind resistance design, focusing on the large span space structure of wind tunnel experiment and CFD numerical simulation research on wind load of the related research achievements and the problems existed in the system summary, further defined the research content of this article;(2)Selection standard cube model as the research object, research of CFD numerical simulation of computational domain size, boundary conditions, turbulence model, meshing, the influence degree of the main parameters for the simulation results, the different calculation models for actual engineering calculation of optimal parameter Settings;(3)Select T flat roof as the research object, using the CFD numerical simulation technology, the structure surface wind pressure distribution is calculated, and by changing the geometry model, turbulence model, main parameters, such as mesh density, contrast analysis of the model T flat roof, the change of the wind pressure coefficient of the windward side and the top surface, to simulate the various conditions, namely under different wind Angle of attack wind pressure distributions, T flat roof structure and its distribution characteristics are analyzed to explore;(4)Select different hole location on the surface of the structure to the wind, looked at the opening of the structure surface wind pressure distribution and surrounding wind field, the effects of opening rate and by changing the size to study the opening size of wind pressure distribution on the surface of a structure and the surrounding flow field, the influence of the analysis of the surface hole location and area of its own security and stability are studied.