Unified static-fatigue bearing design model for self-tapping screw joints in light-weight steel roofs under typhoon hazard
The static tensile tests of self-tapping screw joints of a fatigue-damaged V125 roof are conducted to obtain the remaining bearing capacity of these joints after fatigue loading with different amplitudes.Mean-while,the damage evolution process under static loading is analyzed.The unified static-fatigue bearing design model of the V125 self-tapping screw joints including reduction and degradation factors under the wind-induced fatigue action is proposed.According to the experimental results,the correlation between the wind speed and the wind-induced fatigue reduction coefficient is derived.Based on the typhoon wind speed probability infor-mation of 11 coastal cities in China,the unified static-fatigue design models suitable for V125 self-tapping joints in the corresponding cities are put forward.The results show that the fatigue limit of the V125 self-tap-ping joints is 20％of its static bearing capacity.The typhoon-induced fatigue damage reduction coefficient of the joints in Taipei,China is the largest,while that in Shanghai is the smallest.
万方数据
维普
