长大跨网架结构的模态分析和刚度优化

发布时间：2018-04-10 07:42

本文选题：网架　切入点：模态分析　出处：《建筑结构》2016年S2期

【摘要】：基于结构的动力特性,针对某超长大跨网架结构的初步设计方案的合理性进行了研究。初步方案中网架采用横向桁架体系,搁置在下部独立钢柱上,网架内部横向桁架之间仅存在纵向水平连系杆,整体结构低阶自振模态为水平横向的半波振动,不同于一般网架结构的竖向振动,且基本周期达到0.62s,说明其整体刚度较弱,且刚度不合理。为改善结构自振模态,加强结构整体性,采取多种优化措施,包括增设横向和纵向的水平剪刀撑、纵向斜腹杆以及下部支承结构的连系梁,增加支承结构抗侧刚度等。研究表明这些措施所起的作用是不同的,针对超长大跨网架结构,要综合考虑屋盖和下部支承刚度才能保证结构整体刚度的合理性。
[Abstract]:Based on the dynamic characteristics of the structure, the rationality of the preliminary design scheme of a super long and long span truss structure is studied.In the preliminary scheme, the truss system is adopted and placed on the lower independent steel column. There is only vertical horizontal tie bar between the horizontal truss inside the truss, and the low order natural vibration mode of the whole structure is horizontal transverse half wave vibration.It is different from the vertical vibration of general truss structure, and the basic period is 0.62s, which indicates that the overall stiffness is weak and the stiffness is unreasonable.In order to improve the natural vibration mode of the structure and strengthen the integrity of the structure, a variety of optimization measures are adopted, including the addition of lateral and longitudinal horizontal shear braces, the longitudinal inclined web bar and the connecting beam of the lower supporting structure, and the increase of the lateral stiffness of the supporting structure.The research shows that the functions of these measures are different. In order to ensure the rationality of the overall stiffness of the structure, the roof and the supporting stiffness of the lower part should be considered comprehensively for the super-long and long-span truss structure.
【作者单位】：江苏省苏科建设技术发展有限公司;江苏省建筑科学研究院有限公司;
【分类号】：TU356

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