钢筋混凝土结构的爆炸易损性分析及抗爆设计方法研究

Great uncertainties exist in the blast loads acting on building structures in terrorist or accidental explosions due to the randomness of the type, shape and charge weight of the explosive, as well as environment such as temperature, humidity and barometric pressure. The blast analysis and design methods available in the design Codes are mainly deterministic thus often give unreasonable analysis and design results because they ignore the fact of the uncertainties in both the blast load and the structural properties. Therefore, this project intends to systematically carry out research on methods for blast fragility analysis of RC building structures and establish the methods for blast resistant design of RC structural components and structural collapse prevention of RC structures based on target reliability. The main contents include: (1) through the study of the transmission mechanism of the uncertainty in the explosion, the key parameters that affect the uncertainty of the blast load will be revealed, and the statistical models of the blast load will be established. (2) The method of damage evaluation of typical structural and enclosure components under blast loads will be studied to reveal the key factors affecting the uncertainty of the dynamic response and damage of typical structural and enclosure components; the method for blast fragility analysis of structural and enclosure components under uncertain blast loads will be also proposed. (3) The progressive collapse mechanism of the overall structure caused by blast induced local damage for typical reinforced concrete structures will be studied; the collapse criterion will be proposed for further development of the probability model of collapse resistance of the RC building structures; the method for blast fragility analysis of RC structures under uncertain blast loads will be also proposed. Based on the above research, methods for blast resistant design of RC structural components and structural collapse prevention of RC structures based on target reliability will be established, which could be used not only in blast risk assessment of RC structures, but also in detailed blast resistant design of RC structures against terrorist or accidental blast loads.

恐怖或意外爆炸事件中，由于炸药类型、形状，环境温度、湿度、气压等随机性，使得作用于建筑结构上的爆炸荷载具有很强的不确定性。本项目拟以钢筋混凝土结构为研究对象，系统开展不确定性爆炸荷载作用下钢筋混凝土构件及结构的易损性分析方法研究，建立基于目标可靠度的钢筋混凝土构件抗爆与结构防倒塌设计方法。通过研究爆炸事故中不确定性的传递机理，揭示影响爆炸荷载不确定性的关键参数，建立爆炸荷载的统计模型；通过研究影响结构构件及围护构件动态响应及破坏不确定性的关键因素，建立爆炸荷载下钢筋混凝土结构或围护构件易损性分析与抗爆设计方法；通过研究典型钢筋混凝土结构局部破坏引发结构整体连续倒塌的机制，建立爆炸荷载下结构连续倒塌易损性分析方法与防倒塌设计方法。项目研究成果应用于钢筋混凝土结构的爆炸风险评估，也可直接应用于钢筋混凝土结构抗爆与防连续倒塌设计，提高钢筋混凝土结构的抗爆安全性。

恐怖或意外爆炸事件中，由于炸药类型、形状，环境温度、湿度、气压等随机性，使得作用于建筑结构上的爆炸荷载具有很强的不确定性。本项目以钢筋混凝土结构为研究对象，系统开展不确定性爆炸荷载作用下钢筋混凝土构件及结构的易损性分析方法研究，揭示了影响爆炸荷载不确定性的关键参数，建立爆炸荷载的统计模型，建立爆炸荷载下钢筋混凝土结构或围护构件易损性分析与抗爆设计方法，提出了爆炸荷载下钢筋混凝土结构损伤破坏评估与防倒塌设计方法。主办国内学术会议1次，通过线上参加国内学术会议并做报告4人次，参加国际会议并作大会报告2人次；发表学术期刊论文23篇，其中SCI检索期刊论文21篇，EI检索期刊论文1篇；合作培养博士生2人，硕士生13人，项目研究成果可直接应用于钢筋混凝土结构抗爆与防连续倒塌设计，提高钢筋混凝土结构的抗爆安全性。