摘要
当前,有关技术文件对塔架辅助杆支撑力的规定差别较大.为了澄清这一情况,对形成支撑力的机理进行分析.阐明被撑杆件的整体单向初曲导致均匀分布的支撑力,而局部或反向初曲则产生个别节点的数值较大的支撑力.在此基础上提出支撑力设计值的建议计算公式.文中还对二阶压力-挠度效应作了考察,指出在主杆、斜杆和辅助杆共同组成桁架的情况下,支撑力并不随主杆长细比变化.最后,讨论了支撑刚度问题.
Provisions for bracing force of secondary members in tower structures are diverse in different current technical documents. To clarify the situation, the mechanism of bracing force formation is investigated. It is revealed that global non-reversing initial curvature leads to uniformly distributed bracing force, whereas local or reversing initial curvature causes bracing force of larger amount at individual panel point. Based on this conclusion, formulas for determining bracing force for design use are suggested. The second order compression-deflection effect is also investigated, indicating that, in case the leg member, the diagonal and secondary numbers form together a truss, the bracing force is independent of the slenderness of leg members. Lastly, the issue of bracing stiffness is discussed.
出处
《西安建筑科技大学学报（自然科学版）》
CSCD
北大核心
2009年第4期445-449,共5页
Journal of Xi'an University of Architecture & Technology(Natural Science Edition)
关键词
塔架
辅助杆
支撑力
支撑刚度
tower
secondary members
bracing force
bracing stiffness
