摘要
本文使用有限元软件ANSYS/LS-DYNA建立H型钢梁模型,并利用CONWEP方法对其施加爆炸荷栽。分析了当炸药位于钢梁正下方时,作用在H型钢梁上的爆炸荷栽压力分布和H型钢梁在爆炸荷栽作用下的动力响应及炸药位置等参数对其动力响应的影响。得到以下结论:作用在钢梁上的爆炸荷栽最大超压峰值出现在炸药投影点处,其他点处荷载超压峰值与最大超压峰值的比值与炸药距离H和距投影点的距离R有关;在爆炸荷栽作用下,H型钢梁易发生端部剪切破坏,其塑性变形主要出现在梁端部腹板处;随着炸药靠近梁端部,使得钢梁发生端部剪切破坏时的最大比距离增大。
The CONWEF algorithm uses ANSYS/LS-DYNA to simulate H steel beams that is under the blast loads. When the explosives are located and applied under the beam, the pressure distribution on the beam and the dynamic response of beam under blast load are thus subjected to consideration. A conclusion is therefore drawn that the maximum pressure on the beam is at the projection point of the explosives location, and the ratio of the other points pressure to maximum pressure is decided by the distance of explosive to beam and the distance of the point to the projection point, shear failure is easy to occur at the beam ends under the blast load, and the plastic deformation is easy to occur mainly in the beam web at the beam end. When the explosive position gets near to the beam end, the scale distance that cause the beam ends shear failure is accordingly increased.
出处
《重庆建筑》
2012年第1期29-33,共5页
Chongqing Architecture
基金
山西省自然科学基金(2009011036)资助
关键词
H型钢梁
爆炸荷载
动力响应
破坏模式
比距离
H section steel beam
blast load
dynamic response
failure mode
scaled distance
