Investigation And Analysis On Distribution Coefficient Of Snow Load

human production activity increase by dgree in recent years, which greatly affect the global natural environment and atmosphere environment, leading to durative worsening global climate, a series of etreme meteorologic disasters as snow disaster happen frequently, and no matter the degree of snowfall or range, every kinds of meteorological data in snow disaster all consumedly go beyond the level of the historical record at the same term, and the loss brought by snowdisaster in different field get worse and worse, the one that got severest damage in different kinds of architectural structure is steel structure, mostly on the roof of lightweight steel construction and grid structure, the case that got damage is also increasing year by year, most part of destructive style is the structural damage caused by over loading of snow cover in part of roof, the regulation about distribution of snow cover on roof in existing building load code expose too many limitation, so demand on regulating the distribution coefficient of snow load in criterion become so mightly, this paper combining local data of destructive steel structure in snow disaster and modeling by hydrodynamtics software, roundly analyzed amd emended the distribution coefficient of snow loadμr in present criterion in some ways as follow.1 collecting picture of different kinds of destructive steel structure in snow disaster, construction plan nad weather data, especially the correlate data about, several kinds of steel structure relating to distribution coefficient of snow load in criterion summarizing trait of constructural destruction, this paper classified and got the conclusion according to condition of snow cover,limition of design,problem of construction and so on, and combining the analysis of actual snow pressure on roof in snow disaster based on eight kinds of distribution coefficient of snow load,find out the un-reasonable factor of distribution coefficient of snow load in present criterion.2 this paper utilized the correlate data that have collected about destructive structure in snow disaster, and simulated the condition of snow cover of steel structure refered to distribution coefficient of snow load in present criterion in virtual environment of snow disaster by using software of computational fluid dynamics (CFD) named fluent, analyzed the effect on distribution of snow cover caused by various factor,and classified and made a conclusion.3 utilizing distribution value of pressure of snow cover of several kinds of roof in criterion brought by virtual environment, and combining solution formula of standard value of snow load of criterion,get distribution coefficient of snow load according with virtual environment of snow disaster, compare withμr brought by Regulation of distribution coefficient of snow load in criterion, according to value of snow load on several point on roof, making corresponding modulation on distribution coefficient of snow load, giving reasonable range and value of distribution coefficient of snow load. Summarizing the process of analysis,and offer some idea and suggestion, providing safe and reliable basis for the design and construction in future.