钢筋混凝土构件的大孔径静态破碎技术研究  

Soundless Cracking Technology of Reinforced Concrete Structure with Large Embedded Hole

作　　者：娄荣 陈威文 周方均 邢黎明 商圣波 倪晓静 LOU Rong;CHEN Wei-wen;ZHU Fang-jun;XIN Li-ming;SHAN Shen-bo;NI Xiao-jin(Huahui Engineering Design Group Co Ltd,Shaoxing 312000,China;Huahui Construction Group Co Ltd,Shengzhou 312400,China;Zhejiang University,Hanzhou 310027,China)

机构地区：[1]华汇工程设计集团股份有限公司,绍兴312000 [2]华汇建设集团有限公司,嗦州312400 [3]浙江大学,杭州310027

出　　处：《爆破》2020年第4期127-131,共5页Blasting

基　　金：绍兴市科技计划项目(2018A21010)。

摘　　要：对于钢筋混凝土临时构件的拆除,提出一种沿着轴线设置大直径预埋孔进行静态破碎的方法。基于扩展有限元方法,对某截面尺寸为500 mm×500mm钢筋混凝土梁的静态破碎过程进行了数值模拟。模拟结果表明:裂缝沿着截面对角线方向扩展。应变能释放率结果显示静态破碎过程可分为弹性变形、裂缝稳定扩展与裂缝失稳扩展三个阶段,且拉应力为裂缝扩展的主导因素。针对大孔径静态破碎的冲孔问题,提出了一种可用于钢筋混凝土构件的防冲孔构造,进而采用足尺模型试验验证了大孔径静态破碎技术的可行性。A demolition scheme of temporary reinforced concrete structure based on soundless cracking agent is proposed with large diameter hole embedded along its axis.Based on extended finite element method,the soundless cracking process of a reinforced concrete beam with a section size of 500 mm×500 mm is simulated.The simulation results show that the main cracking propagation route is along the diagonal of the section.The results of strain energy release rate indicate that the tensile stress accounts for the main motivation of cracking propagation.And the static fracture process can be divided into three stages:elastic deformation,stable crack propagation and unstable crack propagation.Aiming at the punching problem of static cracking with a large hole,a method of preventing the phenomenon of hole punching suitable for reinforced concrete structures is proposed.Furthermore,full-scale model tests have proved the feasibility of soundless cracking with large embedded hole along the axis of a reinforced concrete structure.

关 键 词：大孔径静态破碎 扩展有限元法 钢筋混凝土 防冲孔 模型试验 

分 类 号：TU371.5[建筑科学—结构工程]