爆炸荷载作用下钢骨—钢管混凝土柱的动力响应研究
发布时间：2018-08-25 19:48
【摘要】：近年来,世界范围内的恐怖爆炸袭击频繁发生,且随着全球化进程的加快和经济的持续发展,由于电器老化、煤气泄漏、易燃易爆物存放不当和工业生产问题而引发的意外爆炸事故不断增多。爆炸发生的过程很短,转瞬即逝,一旦发生就没有时间采取措施控制它,它所产生的强烈的爆炸冲击波作用到爆源附近的建筑物上,不仅会引起建筑物的破坏和损伤,甚至会造成建筑物某关键构件的失效而丧失承载力,最终导致结构发生局部或整体的连续性倒塌,给人类的生命和财产带来不可估算的损失,因此加强这一领域的研究显得尤为重要。承重柱作为组成结构的关键构件之一,对于其在爆炸荷载作用下的性能研究十分必要。钢骨-钢管混凝土柱(circular steel tube composite columns filled with steel reinforced concrete)作为一种新型的结构形式,现对其在准静态荷载作用下的力学性能已有一定的模拟研究与试验分析,但对其在爆炸荷载作用下的性能研究较少,故本文以ABAQUS软件数值模拟为基础,对爆炸荷载作用下钢骨—钢管混凝土柱的动力响应进行了模拟分析,本文的主要工作如下：(1)对目前国内外关于结构物防爆抗爆研究的现状进行了总结归纳,对本文所研究的钢骨—钢管混凝土结构进行了简要介绍,并对爆炸冲击荷载的基本特性进行了分析研究,针对爆炸冲击波的各个参数,研究了炸药量及爆炸距离、爆炸冲击波的超压峰值压力与持续时间的关系,确定了适合于建筑物表面爆炸冲击荷载作用时的爆炸波超压模型,并将该模型应用于ABAQUS动力有限元分析中。(2)为了准确反映爆炸冲击荷载作用下结构的动力特性以及破坏机理,本文模拟时,混凝土采用考虑了损伤及应变率效应的混凝土损伤塑性模型(即Concrete damaged plasticity),钢材采用经典金属塑性模型(即Classic metal plasticity),该模型均能很好的模拟混凝土和钢筋材料在爆炸冲击荷载作用下的动力响应。(3)本文以ABAQUS软件为基础对钢骨—钢管混凝土柱进行数值模拟,简要介绍了ABAQUS软件的功能特点,并确定了本文模拟时的计算模型。(4)运用参数化分析的方法研究了折合距离、CFRP、箍筋、长细比、轴压比和端部约束对钢骨—钢管混凝土柱抗爆性能的影响,研究表明增大折合距离、使用CFRP加固、加密箍筋间距、减小长细比、增大轴压比、采用合理的端部约束条件均能在一定程度上降低钢骨—钢管混凝土柱的动力响应,进而提高柱体的抗爆性能。
[Abstract]:In recent years, terrorist bombings have occurred frequently around the world, and with the acceleration of globalization and the sustained development of the economy, gas leakage has occurred due to the aging of electrical appliances. Accidents caused by improper storage of flammable and explosive materials and industrial production problems are increasing. The process of explosion is very short and fleeting. Once it occurs, there is no time to take measures to control it. Its strong blast wave acts on the buildings near the explosion source, which will not only cause damage and damage to the buildings. It may even lead to the failure of a key component of a building and the loss of its bearing capacity, resulting in the local or overall continuous collapse of the structure, resulting in an incalculable loss of human life and property. Therefore, it is particularly important to strengthen the research in this field. As one of the key components of the structure, it is necessary to study the behavior of load-bearing columns under explosive loading. As a new type of structure, the mechanical properties of steel-reinforced concrete filled steel tubular column (circular steel tube composite columns filled with steel reinforced concrete) under quasi-static load have been simulated and tested. However, there is little research on its performance under explosive load. Therefore, based on the numerical simulation of ABAQUS software, the dynamic response of concrete-filled steel tubular column under explosive load is simulated and analyzed in this paper. The main work of this paper is as follows: (1) the current situation of research on explosion and anti-explosion of structures at home and abroad is summarized, and the steel steel-tubular concrete structures studied in this paper are briefly introduced. The basic characteristics of blast shock load are analyzed and studied. According to the parameters of explosion shock wave, the relationship between explosive quantity and explosion distance, the peak pressure of explosion shock wave and the duration of explosion shock wave is studied. The explosion wave overpressure model suitable for the blast impact load on the building surface is determined and applied to the ABAQUS dynamic finite element analysis. (2) in order to accurately reflect the dynamic characteristics and failure mechanism of the structure under the explosive impact load, In this paper, Concrete using damage and strain rate effect of concrete damage plastic model (that is, Concrete damaged plasticity), steel using the classic metal plastic model (i.e. Classic metal plasticity),) this model can well simulate the impact of concrete and reinforced materials in the explosion Dynamic response under impact load. (3) numerical simulation of steel-reinforced concrete filled steel tube column is carried out based on ABAQUS software. The functional characteristics of ABAQUS software are briefly introduced, and the calculation model of this paper is determined. (4) the reduced distance, stirrups, slenderness ratio are studied by using parametric analysis method. The effect of axial compression ratio and end restraint on the anti-explosion performance of steel steel-reinforced concrete filled steel tube column is studied. The results show that increasing the folding distance, using CFRP reinforcement, infilling stirrups spacing, reducing the aspect ratio and increasing the axial compression ratio, Reasonable end restraint conditions can reduce the dynamic response of steel-filled steel tubular columns to a certain extent and then improve the anti-explosion performance of columns.
【学位授予单位】：沈阳建筑大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU398.9;TU311.3
[Abstract]:In recent years, terrorist bombings have occurred frequently around the world, and with the acceleration of globalization and the sustained development of the economy, gas leakage has occurred due to the aging of electrical appliances. Accidents caused by improper storage of flammable and explosive materials and industrial production problems are increasing. The process of explosion is very short and fleeting. Once it occurs, there is no time to take measures to control it. Its strong blast wave acts on the buildings near the explosion source, which will not only cause damage and damage to the buildings. It may even lead to the failure of a key component of a building and the loss of its bearing capacity, resulting in the local or overall continuous collapse of the structure, resulting in an incalculable loss of human life and property. Therefore, it is particularly important to strengthen the research in this field. As one of the key components of the structure, it is necessary to study the behavior of load-bearing columns under explosive loading. As a new type of structure, the mechanical properties of steel-reinforced concrete filled steel tubular column (circular steel tube composite columns filled with steel reinforced concrete) under quasi-static load have been simulated and tested. However, there is little research on its performance under explosive load. Therefore, based on the numerical simulation of ABAQUS software, the dynamic response of concrete-filled steel tubular column under explosive load is simulated and analyzed in this paper. The main work of this paper is as follows: (1) the current situation of research on explosion and anti-explosion of structures at home and abroad is summarized, and the steel steel-tubular concrete structures studied in this paper are briefly introduced. The basic characteristics of blast shock load are analyzed and studied. According to the parameters of explosion shock wave, the relationship between explosive quantity and explosion distance, the peak pressure of explosion shock wave and the duration of explosion shock wave is studied. The explosion wave overpressure model suitable for the blast impact load on the building surface is determined and applied to the ABAQUS dynamic finite element analysis. (2) in order to accurately reflect the dynamic characteristics and failure mechanism of the structure under the explosive impact load, In this paper, Concrete using damage and strain rate effect of concrete damage plastic model (that is, Concrete damaged plasticity), steel using the classic metal plastic model (i.e. Classic metal plasticity),) this model can well simulate the impact of concrete and reinforced materials in the explosion Dynamic response under impact load. (3) numerical simulation of steel-reinforced concrete filled steel tube column is carried out based on ABAQUS software. The functional characteristics of ABAQUS software are briefly introduced, and the calculation model of this paper is determined. (4) the reduced distance, stirrups, slenderness ratio are studied by using parametric analysis method. The effect of axial compression ratio and end restraint on the anti-explosion performance of steel steel-reinforced concrete filled steel tube column is studied. The results show that increasing the folding distance, using CFRP reinforcement, infilling stirrups spacing, reducing the aspect ratio and increasing the axial compression ratio, Reasonable end restraint conditions can reduce the dynamic response of steel-filled steel tubular columns to a certain extent and then improve the anti-explosion performance of columns.
【学位授予单位】：沈阳建筑大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU398.9;TU311.3
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