切口高度与延期时差综合影响下框架-剪力墙结构爆破拆除效果研究  

Study on Blasting Demolition Effect of Frame-shear Wall Structure under Influence of Incision Height and Delay Time

作　　者：高文乐 孙鸿 寇玉明 闫桐庆 王燕萍 刘卫东 徐明 GAO Wen-le;SUN Hong;KOU Yu-ming;YAN Tong-qing;WANG Yan-ping;LIU Wei-dong;XU Ming(College of Civil Engineering and Architecture,Shandong University of Science and Technology,Qingdao,266590,China;Jinan Urban Construction Group,Jinan 250031,China;Poly Orica Management Limited,Weihai,264205,China)

机构地区：[1]山东科技大学土木工程与建筑学院,青岛266590 [2]济南城建集团,济南250031 [3]保利澳瑞凯管理有限公司,威海264205

出　　处：《爆破》2024年第3期130-138,211,共10页Blasting

基　　金：国家自然科学基金(51874189)。

摘　　要：为了控制框架-剪力墙结构在爆破拆除后的爆堆高度和后坐距离,以青岛某框架-剪力墙结构居民楼爆破拆除工程为研究对象,利用ANSYS/LS-DYNA软件,对倒塌角度和跨间延期时差正交组合的不同爆破方案进行模拟分析。首先,建立了原方案有限元模型,通过对比实际与模拟结果,验证了模型合理性;其次,仅改变模型的跨间延期时差与切口高度,讨论了结构后坐距离、爆堆高度分别随着二者变化而变化的趋势;然后,基于多方案数值模拟结果,分别提出了后坐距离、爆堆高度二者与切口高度和跨间延期时差相互关系的半定量公式,从而分别确定了结构后坐距离、爆堆高度最小情况下的跨间延期时差和切口高度;最后,分析了框架-剪力墙结构拆除爆破时合理的跨间延期时差以及爆破切口高度的范围。研究结果表明:在相同的切口高度下,各模型后坐距离大都随爆破区段跨间延期时差的延长先减小后增大,在相同跨间延期时差下,爆破切口高度越大,后坐距离就越大,同时,爆堆高度大致都随延期时差的延长而降低。对于此类框架-剪力墙结构,合适的跨间延期时差在270~420 ms之间。大爆破切口可以降低爆堆高度,而小爆破切口又能够有效控制后坐,对确定框架-剪力墙结构爆破拆除的切口高度和跨间延期时差具有一定的指导意义。To control the height and recoil distance of a frame-shear wall structure after demolition by blasting,a frame-shear wall residential building demolition project in Qingdao was chosen as the subject.The simulation analysis used ANSYS/LS-DYNA software and the orthogonal combination of collapse angle and crotch extension time difference.Firstly,a finite element model of the original scheme was built,and the model′s validity was checked by comparing the variance between the model prediction and actual outcomes.Then,the trends of the structure recoil distance and burst pile height with the change were analyzed by changing simply the model′s inter-span extension time difference and cut height.Furthermore,the semi-quantitative formulas for the relationships between recoil distance and burst height with notch height and inter-span delay time difference were proposed based on the outcomes of multi-scenario numerical simulation,which were allowed for the determination of the inter-span delay time difference and notch height for the cases of minimum structural recoil distance and burst height,respectively.Finally,the analysis was carried out on the acceptable span-to-span extension time difference and the range of blasting notch heights for demolition blasting of frame-shear wall structures.The results show four fundamental steps to the collapse of frame-shear wall structures:blast notch creation,destabilized overturning,notch closure,and landing collapse.The study′s findings indicate that the recoil distance of each model primarily increases at first and then decreases as the inter-span extension of the blast section is prolonged at the same cut height.Meanwhile,there is a more significant disparity in the structure′s recoil distance as the deferred time difference is extended,and the recoil distance increases with the height of the blast cut at the same inter-span extension.Additionally,the height of the detonation pile roughly decreases as the time lag increases.The shear walls simultaneously improve the structu

关 键 词：爆破工程 拆除爆破 框架剪力墙结构 数值模拟 

分 类 号：TU746.5[建筑科学—建筑技术科学]