The multi-body and discrete-body dynamic analysis of demolished reinforced concrete structures in China is based on the multi-body dynamic equation(symbol,function)and the variable mass collapse dynamic equa-tion,and the comprehensive solution of the equation,including an analytical solution,is obtained.Using close-range photogrammetry and dynamic equation inversion,the plastic dynamic and structural dismantling parameters of dam-aged reinforced concrete materials are obtained.Based on the similarity criterion of dynamic equations solution,simi-larity criterion formulas of notch for different collapse modes of Various structures are established.Namely,the simi-larity criterion curve fitting formula(5),it's another formula(6),empirical formula(7)of single-notch for building toppling,the example modification curve C4 of similarity criterion of inter-span falling,and the forward.Toppling sim-ilarity criterion formula(8)of backward-seated buildings with the single notch,the similarity criterion formula(9)of continuous impact collapse between floors of high-rise buildings,the empirical formula(10)of multi-notch in-situ im-pact collapse of high-rise buildings,the overturning similarity criterion curve of double-notch buildings in the same direction,and other notch-similarity criterion curve families of building structure collapse,etc.Furthermore,the build-ing collapse rules of the demolition matching table of building structure-collapse mode-notch characteristics are put forward by analogy with 46 demolition examples from its notch similarity criterion curve and example diagram in Chi-na.The judgment rules of building collapse are determined when the coordinate points[λ(λ1,λp),ηh(ηr)]of the building structure and the incision are near the top of the similarity criterion curve.The cut size of various demolition methods of different building structures can be easily determined,and dimensionless charts can determine the demoli-tion effects.Therefore,a simple and accurate demolition control of blasting demolition can be realized using the multi-body dynamic incision control demolition technology(MBDC).
关键词
爆破拆除/楼房/多体-离散体动力分析/楼房结构-倒塌方式-切口特性的匹配
Key words
demolition by blasting/building/multi-body-discrete-body dynamic analysis/matching of building structure-collapse pattern-notch characteristics
维普
万方数据