标准火灾后钢管RPC柱抗近距离爆炸荷载的试验研究

发布时间：2018-07-12 18:18

本文选题：钢管RPC + 抗爆试验　；参考：《工程力学》2017年01期

【摘要】：利用野外抗爆试验场对4根大比例标准火灾后的钢管活性粉末混凝土(Reactive Powder Concrete Filled Steel Tubular,简称钢管RPC)柱进行了抗近距离爆炸试验研究,探讨了恒定轴向力条件下比例距离和受火时间对柱动力响应和破坏形态的影响。结果表明:标准火灾下钢管仍可以有效约束RPC芯柱,限制了RPC的高温爆裂,表现出良好的抗火性能。爆炸作用下火灾后钢管RPC柱的相对位移均超过2.0%,均达到了其屈服状态。当比例距离由0.58 m/kg1/3减小到0.48 m/kg1/3时,钢管RPC柱出现由弯曲变形过渡到弯剪变形的趋势。随着受火时间增加,钢管RPC柱跨中出现明显的塑性变形,最大位移和残余位移均显著增大,发生典型的弯曲破坏。与比例距离相比,钢管RPC柱的抗爆能力对受火时间更为敏感。采用LS-DYNA软件对试验结果进行了数值模拟,模拟结果与试验结果吻合较好。
[Abstract]:In this paper, four reactive Powder concrete filled Steel Tubulars (RPC) columns with large proportion of standard fire have been studied by using field explosion test site. The effects of proportional distance and fire time on the dynamic response and failure mode of columns under constant axial force are discussed. The results show that the steel pipe can effectively restrain RPC core columns under standard fire, which limits the high temperature burst of RPC and shows good fire resistance. After fire, the relative displacement of RPC column exceeds 2.0 and reaches its yield state. When the proportional distance is reduced from 0. 58 m/kg1/3 to 0. 48 m/kg1/ 3, there is a tendency of transition from bending deformation to shear deformation. With the increase of fire time, obvious plastic deformation occurs in the span of RPC column, the maximum displacement and residual displacement increase significantly, and typical bending failure occurs. Compared with the proportional distance, the explosion resistance of RPC column is more sensitive to the fire time. The experimental results are simulated by LS-DYNA software, and the simulation results are in good agreement with the experimental results.
【作者单位】：解放军理工大学爆炸冲击防灾减灾国家重点实验室;
【基金】：国家自然科学基金项目(51378498,51578541,51321064) 江苏省自然科学基金项目(BK20141066)
【分类号】：TU398.9;TU352.13

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