钢筋混凝土墩柱抗爆性能试验

发布时间：2018-07-10 15:07

本文选题：桥梁工程 + 钢筋混凝土墩柱　；参考：《中国公路学报》2017年09期

【摘要】：为了研究爆炸冲击荷载作用下钢筋混凝土墩柱的动力响应特性、损伤破坏模式及破坏机理,考虑不同截面形式、长细比、混凝土类型、箍筋形式、轴压比5个参数,设计制作了11根钢筋混凝土墩柱试件,通过逐渐增大炸药量、减小炸药与墩柱的间距控制爆炸比例距离,进行中场爆炸及接触爆炸试验,同时基于霍普金森相似律,拟合得到了超压峰值与比例距离之间的关系公式。研究结果表明:非接触爆炸作用下,增大墩柱截面面积、使用钢纤维混凝土、方形截面形式、螺旋箍筋等措施能减小截面应变和抑制裂缝的发生,增强墩柱的抗爆性能;接触爆炸作用下,钢筋混凝土墩柱极易在炸药接触位置发生冲切破坏,局部损伤破坏非常严重,同时墩身出现了大量横向贯穿裂缝,接触爆炸下方形截面和轴向力对墩柱的抗爆性能不利;拟合关系公式可供工程结构抗爆设计人员参考,研究结果可供制定桥梁抗爆及其防护规范参考。
[Abstract]:In order to study the dynamic response characteristics, damage failure mode and failure mechanism of reinforced concrete pier columns under blast impact load, five parameters are considered, including different cross-section form, aspect ratio, concrete type, stirrups form and axial compression ratio. Eleven reinforced concrete pier columns were designed and manufactured. By increasing the explosive content gradually, the distance between explosive and pier column was reduced to control the explosive ratio, and the field explosion and contact explosion tests were carried out. At the same time, based on Hopkinson's similarity law, The relationship between the peak value of overpressure and the proportional distance is obtained by fitting. The results show that under the action of non-contact explosion, increasing the section area of pier column, using steel fiber concrete, square section form, spiral stirrups and so on, can reduce the strain of section and restrain the occurrence of crack, and enhance the anti-explosion performance of pier column. Under the action of contact explosion, reinforced concrete pier columns are easy to be punched and destroyed in explosive contact position, and the local damage is very serious. At the same time, a large number of transverse cracks appear in the pier body. The square section and axial force under the contact explosion are unfavorable to the anti-explosion performance of the pier column, the fitting relation formula can be used as reference for the anti-explosion designers of engineering structures, and the research results can be used as a reference for formulating the anti-explosion and protection code for bridges.
【作者单位】：东南大学土木工程学院;总参工程兵科研三所;
【基金】：国家自然科学基金项目(51678141) 中铁总科技研究开发计划项目(2017G006-C)
【分类号】：U446

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