螺栓球节点网架的疲劳分析
螺栓球节点网架的疲劳分析
摘要:螺栓球节点网架结构是一种新型现代化建筑结构。螺栓球节点,作为网架节点,它主要用来在网架或网壳结构中传递三维力流,不仅直接影响网架的安装质量,而且直接影响网架结构中的内力分布。同样,螺栓球节点网架的疲劳问题主要是螺栓球节点的疲劳,节点疲劳的关键影响因素是高强螺栓的疲劳。
本文对高强螺栓疲劳影响因素进行了总结,论述了螺纹形式对应力集中的影响,最后基于上述研究提出了提高螺栓球疲劳强度的措施。
关键词:螺栓球节点网架,疲劳, 高强螺栓, 应力集中
Abstract: the bolt ball node grid structure is a new type of modern construction structure. Bolt ball node, as a network node, it is mainly used to in the rack or reticulated shell transmission of 3 d force flow, not only directly influence the network installation quality, but also directly influence the internal force distribution network structure. Also, bolt ball node rack the fatigue of the main is a bolt ball node of the fatigue, node of the fatigue of key factors is the fatigue of the high strength bolts.
In this paper, the high strength bolts fatigue influence factors are summarized and discussed the thread form on the stress concentration of the influence, and finally based on the findings of the proposed to improve the bolt ball fatigue strength of measures.
Keywords: bolt ball node rack, fatigue, high strength bolt, stress concentration
一、产生的历史背景
1、传统强度设计是以材料力学为基础的。假定材料均质、连续、各向同性、没有裂纹和缺陷,设计时只要满足下式:
σ≤[σ] =σs/k (塑性材料,如中低强钢)
=σb/k (脆性材料,如铸铁)
结构就安全,否则就不安全。
式中:σ-工作应力;