既有建筑大跨度主动托换方法  

Long-span Active Underpinning Method for Existing Building

作　　者：郭达文 黄佳林 张梦月 GUO Da-wen;HUANG Jia-lin;ZHANG Meng-yue(GuangDong Architectural Design&Research Institute Co.Ltd.,Guangzhou 510010;Earthquake Engineering Research&Test Center,Guangzhou University,Guangzhou 510405)

机构地区：[1]广东省建筑设计研究院有限公司,广州510010 [2]广州大学工程抗震研究中心,广州510405

出　　处：《广州建筑》2022年第6期9-12,共4页GUANGZHOU ARCHITECTURE

摘　　要：针对既有建筑进行大跨度托换普遍存在竖向变形控制难的问题,本文以某一多层建筑为例,提出一种适用既有建筑大跨度托换的主动变形控制方法。该方法通过对转换梁进行预顶变形,后张拉预应力,再封闭转换梁与既有承台节点,实现对既有建筑的大跨度主动托换。另外,本文选取一榀典型转换框架进行有限元分析,对比计算被动托换以及本文介绍主动托换变形及应力差异,分析表明:采用主动托换方法比被动托换方法能明显改善上部结构附加竖向变形及附加内力,托换后竖向变形在容许值的低值范围,解决了既有建筑大跨度托换竖向变形控制难题。本文提出的主动托换方法可为相似既有建筑的大跨度托换提供重要参考依据。Aiming at the difficulty of vertical deformation control in long-span underpinning of existing buildings,this study takes a multi-storey building as an example and proposes an active deformation control method suitable for long-span underpinning of existing buildings..The method realizes the large-span active underpinning of the existing building by pre deforming the transfer beam,post tensioning the prestress,and then closing the node between the transfer beam and the existing cushion cap..In addition,in this study a typical transfer frame is selected for finite element analysis,and the differences in deformation and stress between passive underpinning and active underpinning are compared and calculated.The results indicated that compared with passive underpinning,active underpinning can obviously improve the additional vertical deformation and internal force of the superstructure,and the vertical deformation after underpinning is in the low-value range of allowable value,which solved the problem of controlling the vertical deformation of the existing large-span building underpinning.The proposed active underpinning method can provide important reference for large-span underpinning of similar existing buildings.

关 键 词：既有建筑 大跨度托换 主动托换 有限元分析 

分 类 号：TU398[建筑科学—结构工程]