袁望姣,吴运新,邓义芳

• 1:中南大学机电工程学院
• 2:中南大学机电工程学院
• 3:中南大学资源与安全工程学院 湖南长沙410083
• 4:湖南长沙410083

摘要(Abstract)：

钢筋混凝土框架结构定向爆破拆除的力学过程,是一个复杂的结构动力学过程。后承重柱的应力分布,影响着整个框架倒塌定向的准确与施工安全。以某钢筋混凝土框架结构为建模实体,建立了有限元分析模型,并对其倒塌过程进行了定性分析。获得的后承重柱应力分布规律表明:后承重柱的应力值随爆破缺口的高度呈线性递增;梁的存在能有效地“拦截”后承重柱的应力;爆破缺口与梁间的距离越大,后承重柱的应力变化率也越大;含筋率的提高能有效地降低后承重的应力值,同样的含筋率有相同的应力降低幅度;应力突变与梁的状态和后承重柱的钢筋局部加密相关,其突变幅度随爆破缺口的高度的增加而增大,突变点的位置不受爆破缺口高度的影响,只受在倒塌过程发挥力学作用的梁的位置及其下方钢筋加密区长度的影响;后承重柱发生高位断裂的位置是在距爆破缺口最近的梁的下方钢筋加密区与非加密区的联接处附近,断裂口的形状呈“V”字形。

关键词(KeyWords)： 钢筋混凝土;框架结构;承重柱;爆破拆除;应力分布;数值分析

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 袁望姣,吴运新,邓义芳

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