Full-Text Search:
Home|Journal Papers|About CNKI|User Service|FAQ|Contact Us|中文
《Chinese Journal of Rock Mechanics and Engineering》 2006-S2
Add to Favorite Get Latest Update

STUDY ON DAMAGE SURVEYING OF CUTTING-SUPPORT OF HIGH REINFORCED CONCRETE CHIMNEY DEMOLISHED BY BLASTING

ZHENG Bingxu 1,2,WEI Xiaolin 1,2,CHEN Qingshou1(1.China University of Geosciences,Beijing 100083,China;2.Guangdong Hongda Blasting Engineering Co.,Ltd.,Guangzhou,Guangdong 510055,China)  
This photogrammetric monitoring,electronic measure of stress-strain,deformation and damaging dynamic responses of cutting-support of 6 reinforced concrete chimneys,which are not lower than 100 m,are described.The surveying system,apparatus and results are presented.Computer apparatus with many photogrammetric monitors are first adopted.Image edition with supplementary processing of misadjust,denoise and amplifying can be processed by the computer.Its apparatus is simple,and software is mature and technique can be applied to observing outward appearance of construction unit damaged during demolishing high rise buildings by blasting.The achieved results of survey that are different with popular opinions are,during chimney collapsing,initial stability of cutting-support is lost since pliable fracture is conformed to large eccentric center appears,and neutral axis is static or in front.The resistance force of damaged concrete restrained by steel bar is lost completely.It can be recognized by analyzing survey that after blasting,cutting-support is suddenly loaded with weight during collapsing,and cutting-support of chimney will lose initial stability since brittle fracture with large eccentric center appears.Therefore,the neutral axis moving backward is formed from lengthwise balance of resistance force on pressure region,which includes the damaged concrete restrained by steel bar with loadings from chimney weight and moment of tensile region.
【CateGory Index】: TU375
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
©2006 Tsinghua Tongfang Knowledge Network Technology Co., Ltd.(Beijing)(TTKN) All rights reserved