多截面承重立柱框架结构爆破拆除数值模拟研究

为进一步研究多截面承重立柱框架结构爆破拆除倒塌过程以及分析该结构钢筋混凝土柱的受力情况,利用ANSYS/LS-DYNA有限元软件,建立共节点分离式钢筋混凝土框架结构模型,对框架结构爆破拆除倒塌过程进行了数值模拟,并与工程实践进行比较.研究结果表明:数值模拟得到的框架结构倒塌过程与实际爆破的倒塌过程相一致,即分为爆破切口...

Numerical Simulation on Blasting Demolition of Multi-section Load-bearing Column Frame Structure

In order to further investigate the collapse process of the demolition blasting of a multi-section load-bearing column frame structure and analyze the stress of the reinforced concrete columns of the structure,the ANSYS/LS-DYNA finite element software was used to establish a separated reinforced concrete frame structure model with joint nodes.The collapse process of demolition blasting was numerically simulated and compared with engineering practice.The results show that the collapse process of the frame structure obtained by numerical simulation is consistent with the engineering practice.That is,it is divided into four stages:blasting incision formation,semi-free fall,incision closure,and touching ground.In the event of touching ground,a“plastic hinge”is formed at the joints of the columns on the first and second floors to ensure the smooth collapse of the structure.Because the failure strength of the steel bar is much higher than that of concrete,the superstructure is independently supported by the steel bars after the concrete elements co-jointed with the steel bar elements fail.