体内外同索预应力混凝土结构研究及其应用

针对在建筑物加固与改造过程中出现的共享空间增加楼层这种结构形式,提出了一种新颖的体内外同索的预应力体系,将体内的一部分预应力筋延伸至体外加固原结构的梁。首先分析了这种结构通常在改造过程中出现的问题,然后提出该加固思想,介绍了该方法的特点,给出了该方法加固与改造建筑物时预应力损失的计算方法,提出了结构承载力极限状态的计算公式。最后通过工程实例证明这种方法有效、可行,有一定的优越性,值得在加固与改造工程中推广。

STUDY ON A NOVEL PRESTRESSED CONCRETE STRUCTURES WITH THE SAME TENDON IN INTERNAL AND EXTERNAL AND ITS APPLICATIONS

During the process of strenthening and retrofitting, a new type prestressed concrete structure with the same tendons, parts of them were existed in the concrete but others were existed as external, is introduced to retrofit the building with a big story hight to more story building. At the first, the general problem in the process of retrofitting such structure was analyzed,then the novel concept was offered and its eharaeteristic was also presented. The methods to calculate the loss of prestressing of the same tendons were given. Then the methods of the ultimate bearing capacity and the limit state of use were also given. At last, an application example was introduced, which proves such methods effective, feasible, and worthwhile wide application.