CAJ | 학술논문

为了解决爆炸荷载下钢管混凝土柱表面冲击波压力实际分布和数值模拟存在偏差的问题,通过开展钢管混凝土柱爆炸试验,研究冲击波在钢管混凝土柱表面的压力分布,并结合试验建立爆炸荷载下钢管混凝土柱有限元模型,分析不同空气和炸药网格尺寸对冲击波传播及数值分析结果的影响.结果表明：在折合距离为1.1 m/ kg1/3试验条件的爆炸荷载作用下,柱顶与柱底的约束条件良好,柱产生的变形属于弹性变形；考察冲击波对构件的损伤程度,应综合考量峰值压力与正压冲量两者的作用效应；不同空气和炸药网格尺寸对爆炸冲击波的压力峰值及压力时程曲线均有较大影响；数值模拟值与试验实测值的误差随着网格尺寸的减小而降低.综合考察数值分析结果与实测值吻合程度,最终确定：空气和炸药网格尺寸为20 mm,符合折合距离不小于1.1 m/ kg1/3试验条件下的爆炸数值模拟要求.
위료해결폭작하재하강관혼응토주표면충격파압력실제분포화수치모의존재편차적문제,통과개전강관혼응토주폭작시험,연구충격파재강관혼응토주표면적압력분포,병결합시험건립폭작하재하강관혼응토주유한원모형,분석불동공기화작약망격척촌대충격파전파급수치분석결과적영향.결과표명：재절합거리위1.1 m/ kg1/3시험조건적폭작하재작용하,주정여주저적약속조건량호,주산생적변형속우탄성변형；고찰충격파대구건적손상정도,응종합고량봉치압력여정압충량량자적작용효응；불동공기화작약망격척촌대폭작충격파적압력봉치급압력시정곡선균유교대영향；수치모의치여시험실측치적오차수착망격척촌적감소이강저.종합고찰수치분석결과여실측치문합정도,최종학정：공기화작약망격척촌위20 mm,부합절합거리불소우1.1 m/ kg1/3시험조건하적폭작수치모의요구.
In order to eliminate the deviation between explosion test and numerical simulation, the pressure distribution of blast wave on the surface of concrete filled steel ( CFST) column had been analyzed by executing the explosion test. And by using FEM procedure and considering the condition of explosion test, a FEM model of CFST column had been established. In order to investigate the influence of the different mesh size of air and explosive on the blast wave propagation and pressure value of blast wave, the numerical simulation with the different mesh size of air and explosive had been executed based on explosion test results. Analysis of research results shows that the constraints of column are in good condition and deformation of column belongs to elastic stage when the scale distance is 1. 1 m/ kg1 / 3 in explosion test. Both peak pressure value and positive impulse value should be considered together in evaluation of damage on column. The different mesh sizes of air and explosive have great impacts on the peak pressure of blast wave and the trend of pressure-time curve. And the results of numerical simulation correspond with the test results well when the mesh density of air and explosive increases. Finally, by examining the accuracy of the numerical results and comparing with the test results, the mesh size of 20 mm is considered to meet the requirements of numerical simulation when the scale distance is not less than 1. 1 m/ kg1 / 3 .