摘要
双锥型圆钢管是由两端锥形变截面体和中间等截面体组合而成的受力构件,在弯矩、轴力和扭距的组合荷载作用下的破坏性状有三种,分别为破坏截面处于锥体和中间等截面体的交界处、锥体段内和杆端处。本文分析了在各种几何和荷载参数等因素的变化下构件的破坏性状并推导了破坏截面位置计算公式,还利用Mises屈服条件给出了压弯扭作用下截面强度设计公式,发现通过调整各种参数(如锥面坡度i等)可以控制破坏截面的位置,改变构件的破坏性状,提高承载力。同时双锥型变截面圆钢管构件的截面强度计算设计可以分两步进行,首先确定最不利破坏截面的位置,然后应用截面强度设计公式进行截面强度验算。最后通过有限元分析和试验对理论推导进行了验证,弥补了现行规范的不足。
Circular steel tube with tapered ends consists of three parts: the two end truncated cones and a middle straight tube. Under the combined action of bending, axial force and torsion, it has three kinds of failure pattems: the destroyed cross-section lies at the ends, the destroyed cross-section lies in the interface of truncated cone and straight tube, or the destroyed cross-section lies in the truncated cones. This paper presents the formulas for computing the location of destroyed cross-section and the load-carrying capacity of the section by use of Mises stress criterion. It is found that the destroyed cross-section is under the influence of the factors such as the cone taper i, and the location of the failure section can be adjusted by these factors so as to control the location of destroyed cross-section to variate the destruction behavior and thus to enhance the load-carrying capacity of the member. The design process includes two steps : first to determine the failure location and then to check the load-carrying capacity of the cross-section. The results obtained from this method are verified by FEA and experiment.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2005年第6期86-91,107,共7页
Journal of Building Structures
基金
国家科技攻关计划课题(2004BA904B02)
北京市科技计划项目(Z000402804221)
关键词
双锥型圆钢管
最不利截面位置
强度设计
circular steel tube with tapered ends
location of the destroyed cross-section
load-carrying capacity design