高强螺栓群纯弯作用下中和轴位置研究

• 作 者: 王恒 贾明晓
• 机 构: 杭州华正建筑设计院有限公司,同济大学,
• 出 处: 武汉大学学报(工学版)
• 发表日期: 2010年01期
• 关键词: high-strength bolt end-plate neutral axis affected area affected stiffness mecha

从分析存在于端板及高强螺栓中的轴增力、压减力及荷载外拉力的概念及三者间关系入手,指出目前高强螺栓计算中关于中和轴位置及荷载外拉力分布的假定所存在的问题.建立了两种关于螺栓的轴增力和压减力关系的力学模型,此两种模型所得到的荷载外拉力均为对距离的非线性分布.基于其中一种模型,应用力学平衡原理,推导出了高强螺栓关于中和轴位置的方程组,进而对方程组进行求解得到高强螺栓群在弯矩作用下的中和轴位置,为高强螺栓的工程设计提供了一定的理论参考.

Starting from the analysis of the concept of axial force, pressure reduction force and external load of load existing in the end plate and high strength bolt and the relationship among the three, it is pointed out that the assumptions about the position of neutral shaft and the distribution of external tensile force The paper has established two kinds of mechanical models about the relation between the axial force and the compression force of the bolt.The external tensile forces obtained by these two models are nonlinear distribution to the distance.Based on one of the models, Balance principle, deduced the equations of the high-strength bolts about the neutral shaft position, and then solved the equations to get the position of the neutral shaft of the high-strength bolts group under bending moment, which provided a theoretical reference for engineering design of high-strength bolts .