Wind-induced collapse fragility analysis of double column suspended guyed tower
As a wind-sensitive structure,double column suspended guyed tower will be damaged in different degrees and even collapse under strong wind loads,so it is necessary to analyze its vulnerability to wind disaster.For this reason,a wind-induced collapse fragility analysis method for double column suspended guyed tower was proposed in this paper.At first,by considering the uncertainty of structural parameters,the uncertainty models of double column suspended guyed tower were established based on Latin hypercube sampling,and the nonlinear static pushover analysis of all sample models was completed.Then,the collapse fragility curves of double column suspended guyed tower were obtained by using B-R criterion and lognormal distribution function fitting.At last,the effects of wind angle and initial tension of the cable on the collapse fragility curve were investigated.The results show that compared with the deterministic collapse analysis,the uncertain collapse analysis can better evaluate the wind bearing capacity of the double column suspended guyed tower.The wind direction has a significant influence on the collapse fragility of double column suspended guyed tower,and the most unfavorable wind angle of the structure is 45°.When the basic wind speed is less than 56.5 m/s,the collapse probability of the structure at any wind direction is very small.The initial tension of the guy has no effect on the critical wind speed of the structure collapse,but it has a great effect on the fragility curve of the column vertex displacement.With the increase of the initial tension of the guy,the vertex displacement fragility curves of the left and right side columns move to the left,and its influence on the leeward side columns is greater.
万方数据
维普
