落地式钢管桁架拱抗震性能的参数分析

钢管桁架结构的研究偏向于具体工程实例的研究,没有形成比较通用的设计计算方法.为得到落地式钢管结构的关键影响参数,为管桁结构的概念设计提供依据,利用振型分解反应谱法,通过ANSYS有限元软件,对落地式钢管桁架在高跨比H/L、截面宽高比W/H和榀间距S等参数变化下的桁架抗震性能进行参数分析.通过分析发现结构的高跨比H/L对落地式钢管桁架动力响应的影响最为显著.在进行落地式钢管桁架拱的设计时,建议将拱的高跨比控制在1/32≤H/L≤1/8,截面的宽高比控制在1/1.2以内,榀间距控制在4m以外,但榀间距不宜过大.分析结果对于钢管结构抗震性能的概念性设计具有参考价值.

Parameter analysis of anti-seismic performance of steel tubular truss arch standing on ground

Available research of steel tubular truss structure tends to the research of typical engineering structure.A more general design calculation method was never formed.In order to get pivotal influence parameters of steel tubular truss structure standing on ground and provide a basis for concept design of this kind of structure,the parameter analysis of its anti-seismic performance in the case of varied height-to-span ratio H/L,cross-sectional width-to-height ratio W/H,and hinged spacing was carried out with vibration mode decomposition response spectrum method and finite element software ANSYS.It was found by the analysis that the influence of the height-to-span ratio on dynamic response of this tubular arch was most remarkable.When the arch was to be designed,it would be suggested that the depth-span ratio be controlled in the range of 1/32 to 1/8,the cross-sectional width-to-height ratio be controlled in the range of less than 1/1.2,and the hinged spacing be controlled in the range of 4 meters beyond,but the hinged spacing should not be too big.The analysis result would have a ference value for concept design of anti-seismic performance of steel tubular truss.