摘要
托换梁受力性能及其荷载传递方式是既有砖混结构改造设计中的一个重要问题,但现行规范对此内容尚不明确。结合实际工程,利用有限元分析软件对托换梁在承重墙体拆除过程中的受力性能进行分析,并对实际结构进行全过程监测。结合有限元分析和监测结果,讨论了托换梁上部墙体的荷载传递方式。结果表明,托换梁的受力特性取决于上下结构相互变形的协调,托换梁与上部墙体形成了墙梁,而托换梁可仅考虑其自重和本层楼盖的恒、活荷载。
The mechanical performance of the underpinning beam and its load transfer mechanism are significant but indefinite in current codes.Based on an actual project,the mechanical properties of underpinning beams were analyzed during the removal process of the bearing walls by FEM,and the real structural mechanical monitoring was also done by Fiber Bragg Grating（FBG） sensor.Through comparing the results of FEM and structural monitoring,the load transfer mechanism of the underpinning beam was discussed.The results show that the mechanical properties of the underpinning beam are mainly depending on the compatible state of deformation,and the load of the underpinning beam comes mainly from the dead and live load just one layer upon it.
出处
《建筑结构》
CSCD
北大核心
2011年第10期135-138,134,共5页
Building Structure
关键词
砖混结构
加固改造
托换梁
承重墙拆除
有限元法
FBG监测
brick-concrete structure
strengthening and modification
underpinning beam
bearing wall removal
finite element method
FBG monitoring
