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Effects of Concrete Strength and Openings in Infill Walls on Blasting Responses of RC Buildings Subjected to TNT Explosive
Iranian Journal of Science and Technology, Transactions of Civil Engineering ( IF 1.7 ) Pub Date : 2021-01-18 , DOI: 10.1007/s40996-020-00563-x
Ahmet Can Altunışık , Fatma Önalan , Fezayil Sunca

The explosions caused by terrorism and/or accidental lead to serious damage and/or collapse in structures, economic losses, and most importantly endanger public safety. The blasting loads that can be larger than design loads are generally neglected in the design stage of civil engineering structures, despite these catastrophic effects. For these reasons, especially strategically important structures such as hospitals, military buildings, and bridges should be designed considering the blasting effects. To this aim, the effects of design parameters such as concrete strength and openings in infill walls on blasting responses of reinforced concrete (RC) buildings are investigated in this study. In situ experimental tests are firstly conducted on a test specimen constructed with brick elements to verify the finite element (FE) model criteria and assumptions. The blasting experiments are performed using 40, 150, and 290 g trinitrotoluene (TNT) explosives. Then, two RC buildings are selected as application, and blasting analyses are done with numerical and empirical methods. FE models of the buildings including structural and non-structural elements are constituted in ANSYS Workbench software. The blasting analyses are carried out with ANSYS AUTODYN software using 100 kg TNT explosives. In the analyses, two different openings in infill walls and six different concrete classes are considered. The blasting pressures, displacements, absorbed and released total energies, and damage ratios are obtained and presented as comparison parameters. The results obtained from the blasting analyses are presented with graphics and tables, comparatively. The study shows that peak pressures and maximum displacements decrease by 22.50% and 32.16% with the increase in concrete strength. Also, it is observed from numerical analyses that openings in infill walls lead to a change of 8.16% in peak pressures and 13.92% in maximum displacements.



中文翻译:

TNT炸药对钢筋混凝土房屋爆炸响应的影响。

恐怖主义和/或意外事故引起的爆炸会导致建筑物的严重损坏和/或倒塌,经济损失,最重要的是危害公共安全。尽管有这些灾难性的影响,但在土木工程结构的设计阶段,通常会忽略可能大于设计载荷的爆破载荷。由于这些原因,在设计时,应考虑爆破影响,特别是具有战略意义的重要结构,例如医院,军事建筑和桥梁。为此,本研究研究了设计参数(例如混凝土强度和填充墙的开口)对钢筋混凝土(RC)建筑物的爆破响应的影响。首先对由砖构件构成的试样进行现场试验,以验证有限元(FE)模型的标准和假设。使用40、150和290 g三硝基甲苯(TNT)炸药进行爆破实验。然后,选择了两座钢筋混凝土建筑作为应用,并通过数值和经验方法进行了爆破分析。在ANSYS Workbench软件中构建了包含结构和非结构元素的建筑物有限元模型。爆破分析使用100千克TNT炸药使用ANSYS AUTODYN软件进行。在分析中,考虑了填充墙中的两个不同的开口以及六种不同的混凝土类别。获得爆破压力,位移,吸收和释放的总能量以及损伤率,并将其作为比较参数。爆破分析获得的结果将以图形和表格的形式进行比较显示。研究表明,随着混凝土强度的增加,峰值压力和最大位移分别减小了22.50%和32.16%。另外,从数值分析中可以观察到,填充壁的开口导致峰值压力变化8.16%,最大位移变化13.92%。

更新日期:2021-01-18
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