Research On Mechanical Performance Of Qinyang Stadium Under Overloaded Snow

In recent years the extreme blizzard weather occurs frequently, which leads to that the actual snow load on structures often surpasses the design value. Especially under some extreme cases which hardly occur in one hundred years, many light-steel structures collapsed, which brought vast economy loss and casualties. Therefore,it is very significant to carry on a research of the structural behavior for the light-steel structure over the oversurpassing snow load.Qinyang stadium is a major construction project in Henan province, whose roof uses large-span structure system of suspen-dome. Basing on Qinyang stadium, this paper studies the mechanical performance of suspen-dome under overloaded snow.(1) This paper estimated the parameter of stationary binomial probability distribution model for snow loads using maximum likelihood method. Firstly,The maximum likelihood estimation of the model parameters was obtained when the function reached a maximum at a certain set of parameters by introducing the likelihood function. Then the distribution function is tested through the Kolmogorov criterion. Comparison results between the maximum likelihood method and the moment method and the Gumbel method show that maximum likelihood is reasonable and reliable, and it has the best overall effect.Furthermore, snow pressure at Shuyang was calculated according to measured maximum snow depth applying the above three methods, and it was compared with the basic snow pressure in the current code. The results show the snow load of Current specifications is smaller and Recommend maximum value is 1.0kN / m2 under overloaded snow.(2) Considering the incremental approach and the impact of the non-uniform distribution of snow load, analyses of static, eigenvalue buckling, geometric nonlinear and the mechanical performance under overloaded snow on suspen-dome were conducted using finite element analysis software ANSYS. The results show that distribution of snow loads have a great influence on the performances of suspen-dome structure and the geometric nonlinear is not obvious, overall closing to the rigid system under overloaded snow. The half span distribution along minor axis is the most dangerous and the location combination distribution is safest.(3) Considering the combination of low temperature, analyses of static, eigenvalue buckling,geometric nonlinear and the mechanical performance on Qinyang stadium were conducted using finite element analysis software ANSYS. Comparison results between the Condition of temperature and the Condition of without temperature show that the effect of temperature on suspen-dome structure is very obvious.