单层预应力撑杆柱的预应力研究

预应力撑杆柱可以提升普通受压钢柱的承载能力,而拉索初始应力是影响预应力撑杆钢柱稳定性能的重要因素.以设置斜向撑杆的预应力撑杆钢柱为研究对象,重点研究其初始预应力的确定方法,基于理论推导建立了其初始预应力的计算公式.此外,根据所建立的初始预应力计算公式,讨论了屈曲荷载与初始预应力的关系以及拉索刚度、撑杆刚度和撑杆倾角对初始预应力的影响.研究还表明:过大的初始预应力反而会降低这类结构的屈曲荷载.

On Stays' Prestress of Single-Crossarm Stayed Column

The prestressed stay column can improve the bearing capacity of ordinary compression steel column, and the initial prestress of cable is an important factor affecting the stability of prestressed stay column. In this paper, the method of determining the initial prestress of the prestressed steel column with inclined corssarm has been studied, and the calculation formula of the initial prestress been established based on the theoretical derivation. In addition, according to the calculation formula of initial prestress, the relationship between buckling load and initial prestress and the influence of stays stiffness,stiffness of crossarm and crossarm inclination on initial prestress have been discussed. The results show that too much initial prestress will reduce the buckling load of such structure.