逐跨起爆条件下框剪结构楼房内力调整机制试验研究  

Experimental Study on Internal Force Adjustment Mechanism of Frame-shear Wall Structure under Condition of Span-by-span Detonation

作　　者：姚颖康 贾永胜[1,2] 孙金山 谢先启[1] 刘昌邦 YAO Ying-kang;JIA Yong-sheng;SUN Jin-shan;XIE Xian-Qi;LIU Chang-bang(Hubei Key Laboratory of Blasting Engineering of Jianghan University,Wuhan 430056,China;Wuhan Explosions and Blasting Corporation Limited,Wuhan 430056,China)

机构地区：[1]江汉大学爆破工程湖北省重点实验室,武汉430056 [2]武汉爆破有限公司,武汉430056

出　　处：《爆破》2020年第3期1-7,20,共8页Blasting

基　　金：2014年度武汉市创新人才计划项目。

摘　　要：针对高层楼房定向倾倒爆破拆除的失稳破坏机制问题,依托一栋20层框剪结构楼房爆破拆除工程,通过现场动态应变测试,分析了逐跨起爆条件下楼房上、中、下等不同部位柱、梁构件在结构倒塌过程中的内力调整机制。研究结果表明:第1排立柱起爆时,切口区上方立柱首先会承受爆炸荷载产生的101量级附加压应变,该应变随层高增加而衰减;逐排起爆条件下,切口区上方立柱因竖向约束的逐排解除而产生递增的102量级的附加拉应变;当切口区立柱全部起爆后,支撑区最后排立柱因重力荷载重分配先产生102量级的拉压应变震荡,最终产生103量级的压应变直至立柱压溃;逐排起爆条件下,前跨梁体由两端固结的超静定结构变成悬臂结构直至破坏,后跨梁体的梁柱节点会发生多次扭转,并伴有102~103量级的拉压应变转换。研究成果可为高层楼房爆破拆除设计和结构连续性倒塌分析提供参考。The internal force adjustment mechanism was studied in order to analyze the destruction process of directional blasting demolition for high-rise buildings.This study was carried out based on a blasting demolition project of twenty-story frame-shear wall structure building.On-site dynamic strain of columns and beams in different representative positions of upper,middle and bottom part of the building was measured so as to conduct the analysis.The results show that:when the first row columns were detonated,the upper columns of the cutting area first bore additional compressive strain in 101 magnitude generated by the blasting load,and this strain decreased with the floor increased.In the condition of span-by-span detonation,there was additional tension strain in a 102 magnitude in the upper columns of the cutting area,and the strain increased gradually as the vertical constraints were removed.When all the columns in the cutting area were detonated,the last row columns in the supporting area generated 102 magnitude strain fluctuation because of load redistribution,then generated 103 magnitude compressive strain until the column was crushed.In the condition of span-by-span detonation,the front beam structure changed from statically indeterminate structure to cantilever structure until destroyed,and the beam-column joints of the back beams reversed multiple time,with 102~103 magnitude strain fluctuation.The study can provide reference for relevant blasting demolition design and structural progressive collapse analysis.

关 键 词：框剪结构楼房 爆破拆除 定向倾倒 逐跨起爆 内力调整机制 

分 类 号：O389[理学—流体力学] TU746.5[理学—力学]