简支T梁桥在爆炸荷载作用下的易损性分析
发布时间：2018-12-10 10:33
【摘要】：桥梁在国民经济生活中占据着十分重要的地位,一旦遭受恐怖袭击或者意外爆炸,不仅会导致桥梁破坏甚至倒塌,还可能造成附近的人员伤亡和经济财产损失。然而现行国内设计规范中对于结构抗爆设计的要求尚欠缺,这就造成了现有的桥梁抗爆能力极为薄弱,一旦遭到恐怖袭击或意外爆炸,则会造成不堪设想的后果。因此开展爆炸荷载作用下混凝土桥梁结构的响应问题以及损伤效应的相关基础和应用研究,找到更加合理的设计理论和方法,使桥梁结构能有效抵御爆炸荷载的作用是非常必要的。本文以河南省义昌大桥爆竹爆炸的事故为背景,主要内容包括以下几个方面:1.分析国内外的研究现状,通过对爆炸的基本理论研究,研究混凝土桥梁在爆炸荷载下的损伤机理,明确桥梁结构的爆炸分析方法。2.通过ANSYS软件建立简支T梁数值模拟模型,研究爆炸荷载作用下钢筋混凝土梁的动力响应和破坏模式。通过改变比例距离、TNT当量、TNT相对于梁的位置等参数,数值模拟简支T梁的梁体爆炸,分析钢筋混凝土简支T梁的抗爆性能。指出改变参数会导致钢筋混凝土梁的破坏程度不同。3.通过ANSYS软件建立简支T梁桥数值模拟模型,通过改变TNT相对于梁的位置等参数,模拟简支T梁桥的爆炸,分析钢筋混凝土简支T梁桥的抗爆性能。指出TNT相对于桥的位置改变会影响钢筋混凝土梁桥的破坏程度。4.通过ANSYS软件建立简支T梁桥数值模拟模型,对在特定位置的简支T梁桥的易损性进行了分析,给出了易损性标准及易损性曲线。
[Abstract]:Bridges play a very important role in the national economic life. Once they are attacked by terrorists or accidentally exploded, they will not only lead to the destruction or collapse of bridges, but also may cause casualties and economic property losses in the vicinity. However, the requirement of structural anti-explosion design in the current domestic design code is still lacking, which leads to the extremely weak anti-explosion capability of existing bridges. Once the bridge is attacked or accidentally exploded, it will result in unimaginable consequences. Therefore, the response problem of concrete bridge structure under explosive load and the related foundation and application of damage effect are studied to find more reasonable design theory and method. It is necessary to make bridge structure resist explosion load effectively. This paper takes the explosion accident of Yichang Bridge in Henan Province as the background. The main contents include the following aspects: 1. This paper analyzes the present research situation at home and abroad, studies the damage mechanism of concrete bridge under explosion load, and clarifies the explosion analysis method of bridge structure by studying the basic theory of explosion. The numerical simulation model of simply supported T-beam is established by ANSYS software, and the dynamic response and failure mode of reinforced concrete beam under explosive load are studied. By changing the ratio distance, TNT equivalent and the position of TNT relative to the beam, the explosion of simply supported T-beam is simulated numerically, and the anti-explosion performance of reinforced concrete simply supported T-beam is analyzed. It is pointed out that the failure degree of reinforced concrete beams will be different by changing the parameters. The numerical simulation model of simply supported T-beam bridge is established by ANSYS software. The explosion of simply supported T-beam bridge is simulated by changing the position of TNT relative to the beam, and the anti-explosion performance of reinforced concrete simply supported T-beam bridge is analyzed. It is pointed out that the change of the position of TNT relative to the bridge will affect the damage degree of reinforced concrete beam bridge. 4. The numerical simulation model of simply supported T-beam bridge is established by ANSYS software. The vulnerability of simply supported T-beam bridge in a special position is analyzed, and the vulnerability criterion and curve are given.
【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U447
本文编号：2370428
[Abstract]:Bridges play a very important role in the national economic life. Once they are attacked by terrorists or accidentally exploded, they will not only lead to the destruction or collapse of bridges, but also may cause casualties and economic property losses in the vicinity. However, the requirement of structural anti-explosion design in the current domestic design code is still lacking, which leads to the extremely weak anti-explosion capability of existing bridges. Once the bridge is attacked or accidentally exploded, it will result in unimaginable consequences. Therefore, the response problem of concrete bridge structure under explosive load and the related foundation and application of damage effect are studied to find more reasonable design theory and method. It is necessary to make bridge structure resist explosion load effectively. This paper takes the explosion accident of Yichang Bridge in Henan Province as the background. The main contents include the following aspects: 1. This paper analyzes the present research situation at home and abroad, studies the damage mechanism of concrete bridge under explosion load, and clarifies the explosion analysis method of bridge structure by studying the basic theory of explosion. The numerical simulation model of simply supported T-beam is established by ANSYS software, and the dynamic response and failure mode of reinforced concrete beam under explosive load are studied. By changing the ratio distance, TNT equivalent and the position of TNT relative to the beam, the explosion of simply supported T-beam is simulated numerically, and the anti-explosion performance of reinforced concrete simply supported T-beam is analyzed. It is pointed out that the failure degree of reinforced concrete beams will be different by changing the parameters. The numerical simulation model of simply supported T-beam bridge is established by ANSYS software. The explosion of simply supported T-beam bridge is simulated by changing the position of TNT relative to the beam, and the anti-explosion performance of reinforced concrete simply supported T-beam bridge is analyzed. It is pointed out that the change of the position of TNT relative to the bridge will affect the damage degree of reinforced concrete beam bridge. 4. The numerical simulation model of simply supported T-beam bridge is established by ANSYS software. The vulnerability of simply supported T-beam bridge in a special position is analyzed, and the vulnerability criterion and curve are given.
【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U447
【参考文献】
相关期刊论文 前1条
1 刘山洪,魏建东,钱永久;桥梁结构爆炸分析特点综述[J];重庆交通学院学报;2005年03期
，本文编号：2370428
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