一带悬挑结构的计算分析与补强设计

哈药六厂某厂房外横墙因功能调整需由原设计的 4 90mm厚砖墙改为 6 2 0mm厚砖墙 ,为使本工程的外观造型与其近邻办公楼相协调 ,在该外横墙外侧需较原设计增设干挂石材幕墙 ,由于填充墙加厚及干挂石材幕墙等新增荷载在原设计中未予考虑 ,需对带悬挑的预应力边框架进行核算与补强加固。经核算 ,框架柱及框架梁的非悬挑区段在荷载增大后仍能满足相关设计标准的要求 ,只需对框架梁的悬挑区段进行补强加固。提出了通过在基础悬挑梁和一层顶悬挑梁间后置钢筋混凝土墙形成带边框深梁以增大悬挑结构抗力 ,减小悬挑结构裂缝和变形的加固思想和方法。可供同类工程加固改造设计时参考

ANALYSIS AND STRENGTHENING DESIGN OF A STRUCTURE WITH CANTILEVER

In Harbin No.6 Pharmaceutical Factory,the thickness of an external transverse brick wall of a workshop building needs to be changed from 490mm to 620mm due to functional requirement.In order to be harmonious with the adjacent office building′s ornament,dry-hanging-stone curtain wall must be put up outside the external wall.The prestressed frame with cantilever should be checked and strengthened,for the additional loads caused by thickened wall and curtain wall are not considered in the original design.Calculation shows that all columns and beams except cantilever beams still meet the relative design standards in the condition of the increased loads,so only the cantilever beams need strengthening.It is proposed that the idea and method to increase resistance,reduce crack and deflection of the cantilever structure by setting up a post-constructed concrete wall between the cantilever beam of the foundation and that of (1st) floor of the frame to form a deep beam with a column on one side.It can be served as reference for design of similar strengthening and remodeling project.