爆炸荷载作用下不锈钢管混凝土构件工作机理研究  

Working mechanism of concrete-filled stainless steel tubular members subjected to blast loading

作　　者：谭清华[1,3] 韩林海[1,2] 贾少刚 蒋志刚[3] Tan Qinghua;Han Linhai;Jia Shaogang;Jiang Zhigang(Guangxi University,Nanning 530004,China;Tsinghua University,Beijing,100084,China;National University of Defense Technology,Changsha 410073,China)

机构地区：[1]广西大学,广西南宁530004 [2]清华大学,北京100084 [3]国防科技大学,湖南长沙410073

出　　处：《土木工程学报》2024年第6期74-91,共18页China Civil Engineering Journal

基　　金：国家自然科学基金重点国际(地区)合作研究项目(52220105005);湖南省自然科学基金(2018JJ2470)。

摘　　要：本文进行不锈钢管混凝土构件在爆炸荷载作用下力学性能的试验研究,试验参数包括钢管截面形式(圆形、方形)、比例距离及有无填充混凝土。建立爆炸荷载作用下不锈钢管混凝土构件动态响应的有限元分析模型,模型计算结果得到试验结果的验证。基于验证的有限元计算模型,对比分析不同条件下不锈钢管混凝土和普通钢管混凝土构件的破坏形态、动态响应和耗能规律。试验和有限元分析结果均表明:随着比例距离减小,构件的破坏程度由弹性变形到弯曲破坏或剪切破坏;混凝土的填充能够有效延缓钢管发生局部屈曲和破坏,构件的承载能力、变形能力和耗能能力得到有效提升,进而提高构件的抗爆性能。在近场爆炸范围内,不锈钢管混凝土和普通钢管混凝土构件均出现三种可能的整体破坏形态,即弯曲破坏、弯剪破坏和剪切破坏,另还伴随有较明显的局部破坏形态;在条件相同包括名义屈服强度相同的情况下,不锈钢管混凝土构件的抗爆性能优于相应普通钢管混凝土构件。Performance of Concrete-Filled Stainless Steel Tubular(CFSST)members under blast loading was studied in this work.The experimental parameters,including cross-section form(in circular and square shape),the scaled distance and the case with or without in-filled concrete,were discussed.Furthermore,finite element models for dynamic response analysis of CFSST members under blast loading were established,and the numerical results predicted by the finite element models agreed well with the test results.Based on the validated finite element models,the failure modes,dynamic responses and energy dissipation laws of CFSST members and the Concrete-Filled Carbon Steel Tubular(CFST)members were analyzed and compared.Both the test results and the finite element analysis results disclose that with the decrease of the scaled distance,the damage degree of the CFSST members changes from the elastic deformation bending damage or shear fracture.By filling concrete,local buckling and damage of stainless steel tube can retarded,and the load-carrying,deformation capability and energy dissipation capacity of CFSST members can be enhanced effectively.Hence,the blast resistance of CFSST members can be improved.Both CFSST and CFST members present three possible global failure modes under the near-field explosion,namely bending failure,bending-shear failure and shear failure,as well as obvious local damage.Under the same conditions(including the nominal yield strength),the blast resistance of CFSST members is superior to that of CFST members.

关 键 词：不锈钢管混凝土 爆炸荷载 超压 动态响应 耗能 

分 类 号：TU398.9[建筑科学—结构工程]