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建议在一般薄壁方形管的表面增加一些模式,以增强其在轴压荷载作用下的耗能能力。利用非线性有限元程序LS-DYNA进行类静力轴向挤压分析,并利用基本的锥形单元构建两种类型的钢管,A形管主要是控制相对较薄方管的进一步破坏;而B形管主要是建立新的破坏模式,以期在结构破坏时能耗散更多的能量。总共对长度为120mm,厚度为1.2mm和宽度为40或60mm的30个钢管进行了模拟。数值结果表明:所有的A形管都发展了扩展破坏模式,总质量增加不超过5%,并且比传统薄壁方形管耗散的能量多15%~32·5%。与此同时,在B形管中发现一种新的破坏模式,被称为八边形破坏模式,其耗能能力较之传统钢管增加了54%~93%。同时还讨论了各种模式对管耗能的不同影响。
It is recommended that some patterns be added to the surface of a generally thin-walled square tube to increase its energy dissipation capacity under axial load. The static finite element program LS-DYNA was used for the quasi-static axial compression analysis. Two types of steel pipes were constructed by using basic conical units. The A-pipes mainly controlled the further destruction of the relatively thin square pipes. The B Shaped pipe is mainly to establish a new mode of destruction, in order to dissipate more energy in the destruction of the structure. A total of 30 steel pipes of length 120 mm, thickness 1.2 mm and width 40 or 60 mm were simulated. The numerical results show that all A-tubes develop an extended failure mode with an overall mass increase of no more than 5% and 15% to 32.5% more energy than traditional thin-walled square tubes. At the same time, a new failure mode was found in the B-tube, called the octagonal failure mode, which increased its energy consumption by 54% -93% compared to the traditional steel tube. The different effects of various modes on tube energy consumption are also discussed.