CAJ | 학술논문

为了实现对钢筋混凝土简支板梁桥爆破拆除过程的有限元数值模拟，采用动力分析软件ANSYS/LS-DYNA建立了分离式共节点模型；对比分析了在板梁两侧切口与跨中切口采用微差爆破与不采用微差爆破2种方案下的爆破效果，并对2块板梁上、下缘混凝土的受力过程进行了分析。结果表明：分离式共节点模型可以体现出钢筋和混凝土的力学性能差异；采用微差爆破可以减小爆堆范围，使得更多的钢筋和混凝土单元失效被删除。
위료실현대강근혼응토간지판량교폭파탁제과정적유한원수치모의，채용동력분석연건ANSYS/LS-DYNA건립료분리식공절점모형；대비분석료재판량량측절구여과중절구채용미차폭파여불채용미차폭파2충방안하적폭파효과，병대2괴판량상、하연혼응토적수력과정진행료분석。결과표명：분리식공절점모형가이체현출강근화혼응토적역학성능차이；채용미차폭파가이감소폭퇴범위，사득경다적강근화혼응토단원실효피산제。
In order to realize the numerical simulation of blasting demolition for reinforced concrete (RC) bridges of simply-supported plate girder ,the separate model of common nodes was established using the dynamic analysis software ANSYS/LS-DYNA .The blasting effectiveness between using millisecond blasting and without using millisecond blasting at the cuts which was on both sides and the plate girder at mid-span were comparatively analyzed ,then the loading processes of the concrete both on the upper and lower edge were studied .The results show that the separate model of common nodes can reflect the differences of the mechanical property between the steel and concrete ;the scope of the blasting heap can be decreased and more steel and concrete elements can be invalid by using the scheme of millisecond blasting .