爆破拆除框架跨间下塌倒塌的切口参数

研究了爆破拆除框架楼房跨间下塌倒塌的动力学条件,即倾倒动能大于克服跨间下塌所需的功,包括阻止翻倒的势能增量、梁柱夹角形变的功和克服翻滚阻力的功。由此推导出跨间下塌倾倒时,楼房爆破下坐后质心高宽比η与切口高宽比λ的关系。给出了不同跨数和弯矩相似准数Kt条件下楼房翻倒的λ～η关系图及公式,跨间下塌最终倒塌角(φh+αf)与λ～η的关系图。通过楼房跨间下塌倒塌的实例验证了λ～η关系的合理性。

CUTTING PARAMETERS OF TOPPLING FRAME BUILDING DEMOLISHED WITH COLLAPSE IN BEAM SPAN BY BLASTING

Dynamic condition of toppling frame building demolished with collapse in beam span by blasting was researched.Toppling kinetic energy was larger than the work formed in collapse of beam span to overcome,including potential energy increment of preventing toppling,work resisting angle deformation of beam and column and roiling resistance to overcome.The relation between high-wide ratioηof building mass centre and high-wide ratio λ of cutting since blasting and sitting down was deduced.The relational figure and formula between λ and η and the relational figure between terminal collapse angle(φh+αf)and λ～η were presented under different spans and the simulated formula value Kt.Some examples of building toppling down with collapse in beam span were listed to demonstrate the relation of λ～η.