基于阶梯压杆模型和最小势能原理的立柱爆高计算

摘要

通过对拆除爆破中钢筋混凝土框架立柱失稳因素的探讨,提出了基于阶梯压杆模型计算爆高的一种能量方法.该模型将爆破的立柱简化为阶梯压杆,综合考虑了立柱破碎区和非破碎钢筋混凝土区对立柱稳定性的影响.根据小挠度稳定性理论,应用最小势能原理,得到临界压力的理论值.算例表明:该方法计算过程比较简单且结果合理,可为工程爆破拆除设计和框架结构立柱失稳研究提供参考.%Through analyzing on influence factor of concrete frame pillar collapse in controlled blasting,an energy method of calculating blast height was presented based on stepped bar model. This mechanical model simplifies the pillar as stepped bar,meanwhile,considers the influence of the broken and unbroken area RC on the pillar stability. Furthermore, the critical pressure is derived by using the principle of minimum potential energy according to small deflection linear stability theory. The example shows that the result of calculation is simple and reasonable, which provides conferences for blasting scheme and pillar instability research in frame construction.