不同连接方式对钢梁钢柱节点抗爆性能的影响

研究爆炸荷载作用下钢梁钢柱节点的动力学性能,对有效预防整体结构的连续性倒塌具有重要意义。先利用有限元分析软件ANASYS/LS-DYNA对爆炸荷载作用下的钢梁进行数值模拟,并与Amr的实验结果进行对比以验证模型和所用材料参数的合理性;然后研究采用不同连接方式(狗骨式连接和端板螺栓式连接)对钢框架梁、柱节点抗爆性能的影响。研究表明:与端板螺栓式连接相比,在相同爆炸荷载作用下,狗骨式连接时节点的最大应力较小,梁跨中节点的最大挠度最大。由于狗骨式连接在梁的上、下翼缘处进行了一定的削弱处理,使得较长的梁段能同时进入塑性阶段,可有效保护节点。在相同爆炸荷载作用下,端板螺栓式连接时,节点的承载能力和抗塑性变形能力要优于狗骨式连接。

Study on attenuation law of soil retaining wall to blast wave

In order to study the attenuation effect of soil on blast wave, the finite element software ANSYS/LS-DYNA was used to simulate the explosion in a closed vessel containing soil. The SPH-FEM coupling algorithm was used to establish the explosion model with different thicknesses(15, 18, 21, 24, 27 and 30 cm respectively) and at different distances(10, 20, 30, 40, 50 and 60 cm respectively), and the peak pressure, arrival time and damage process of soil were compared and analyzed. The results show that when the wall is 40 cm away from the blasting center and the thickness is 24 cm, the average attenuation rate of the peak pressure is 72.25 %, and the increment of average attenuation rate is 2.75 %; when the wall is 10 cm away from the blasting center and the thickness is 24 cm, the quasi-static air pressure attenuates by 44.44 %. The energy attenuation of blast wave increases with the thickness of wall and decreases with the distance away from the blasting center.