高耸筒形结构物爆破切口计算原理研究

切口高度的确定是钢筋混凝土高耸筒形结构物爆破拆除的关键问题。笔者认为，切口高度不应与结构物的壁厚有关，而主要应由结构物在倾倒至瀑破切口闭台时的倾覆力矩大于余留支撑截面的极限抗弯力矩的原则来确定。通过分阮给出了满足上述条件的切口高度计算公式，对于确定的筒形结构物，其瀑破切口的高度与切口处直径的平方成正比，与结构物的质心高度成反比。孩计算公式经实践检验基本是合理的。

STUDY ON CALCULATION PRINCIPLE OF BLASTING CUT OF TOWERING TUBULAR BUILDINGS

The determination of cut height is key to blasting engineering fordemolishing reinforced concrete towering tubular buildings.In this paper,itis believed that the cut height is independent from the thickness of building′swallIt.mainly depends on the principle that the toppling moment of buildingis more than the limited bending moment of supporting area of the remainedpart when the cut is closed along with the bu ilding toppling.Based on theanalysis,the formula for calculating the height of blasting cut is given. With the formula,the cut height is directly proportional to the square ofcut diameter of a determined tubular building’and inversely proportionalto the height of the center of gravity of the building.On the whole, thisformula is basically reasonable in practice.