落地式钢管桁架拱抗震性能的参数分析

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

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.

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 vi- bration 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.