预应力索杆组合空间网架结构研究

预应力平板网架结构施加预应力方案有两种 ,一种是在普通网架的下弦平面下设置预应力索 ,另一种是通过强行调整网架结构支座的高差来达到施加预应力的目的。为此 ,提出一种新型组合结构———预应力索杆组合网架结构 ,研究了用钢索代替下弦杆 ,并在每段钢索上施加不同预应力时所引起的结构内力和变形情况 ,与普通网架结构进行对比 ,指出了这种索杆组合网架结构的特点和应用于大跨度建筑中的潜力。

INVESTIGATION ON THE PRESTRESSED CABLE-MEMBER COMBINED GRID STRUCTURE

There are two kinds of methods of the prestressing on a prestressed grid structure It is the first method that prestressed cables are installed in the bottom chord plane of the general grid structure In order to exert the prestress,another is to adjust the difference of elevation of the grid structure bearing In this paper,it is presented that the new combined structure--prestressed cable member combined grid structure It is investigated that the structure deforms when the different prestresses are exerted on each cable member in the case of replacing the bottom chord by the cable, the results are compared with general grid structure It is pointed out that the features of the cable member combined structure and the potential of its using for big span building