任利民¹，盛  超²
（1南京新街口百货商店股份有限公司，南京210005; 2 南京工业大学鉴定与加固中心，南京210009）

[摘要] 为了解决既有高层建筑结构增设大跨度悬挑梁所面临的问题，采用了体内外同索预应力技术进行悬挑梁设计，不仅提高了悬挑梁根部的抗裂性，而且还对既有结构边跨梁端负弯矩区实现了加固。本文结合工程实例探讨了体内外同索预应力技术进行大跨悬挑梁的设计和计算方法。实践证明，本文方法是切实可行的，并具有一定的优越性。
[关键词]  体内外同索；索梁分载法；悬挑梁；加固改造

Application of Same Tendon in Internality and Externality Prestressed in High-rise Building Strengthen
Ren Limin¹, Sheng Chao²
(1Nanjing Xinjiekou Department Store Co.,  Ltd. , Nanjing 210008, China; 2 Center of Identification and strengthening, Nanjin University of Technology,  Nanjing 210009, China)

Abstract: In order to solve the existing high-rise building additional large-span cantilevered beam facing the question of the use of same tendon in internality and externality prestressed technology for cantilevered beam design, not only improve the cantilevered beam crack roots,  but also on both the structure of cross-border negative moment beam reinforced zones. In this paper, combined with engineering examples show that the same tendon in internality and externality prestressed technology for large-span cantilevered beam design and calculation methods. Practice has proved that this method is practical and superiority.
Keywords: same tendon in internality and externality; loading method distribution to cable-beam; cantilevered beam; Strengthening and retrofit