爆炸冲击荷载作用下双向张弦梁结构动力分析与抗爆研究
发布时间：2019-03-26 13:17
【摘要】：双向张弦梁结构属于一种新型的杂交结构。它是介于刚性结构和柔性结构之间的半刚性半柔性结构,并且这种结构具有自重轻、承载能力强、施工简便、平衡稳定性好、结构美观等优点。目前在爆炸冲击荷载作用下的大跨度空间结构分析研究中,主要有单层球面网壳结构、柱面网壳结构、双层球面网壳结构这几种结构形式,对双向张弦梁结构屋面网架受爆炸冲击荷载作用的情况尚缺乏研究；而且在抗爆方面,我国也没有明确的抗爆规范。同时,双向张弦梁结构建筑又是人群活动密集公共场所,这类人流密集型场所常常成为恐怖分子袭击的目标。然而在一般大跨度双向张弦梁设计中,极少考虑爆炸荷载对结构的影响,没有明确规定保证结构抗爆安全性能的措施,一旦双向张弦梁结构受到爆炸冲击,将会导致较大的经济损失以及不可估量的人员伤亡。因此研究双向张弦梁在这种特殊荷载作用时的动力反应及结构应力变化规律,进而提高此结构的抗爆安全性是十分必要的。通过建立炸药在空气中爆炸的仿真模型,根据距炸药不同距离是的超压波峰值与同一条件下的经验公式相对比,从而证明LS-DYAN/ANSYS软件进行数值仿真模拟的正确性。根据爆炸冲击波的传播规律,建立空气,高爆炸药,双向张弦梁结构的杆件与屋面板的各种材料参数模型,对爆炸冲击荷载作用下的双向张弦梁结构进行了动力响应分析。主要研究了炸药在双向张弦梁结构中心上方不同高度处爆炸的情况和起爆点的位置在结构上方中心横向变化时的结构杆件位移变化规律,并根据爆炸相似律理论,拟合出爆炸冲击荷载作用下双向张弦梁各杆件的超压波峰值的经验公式,归纳出双向张弦梁结构受爆炸冲击荷载的偏心作用时杆件的应变变化规律。在此基础上,将双向张弦梁结构受爆炸冲击荷载作用的情况与其他大跨度空间结构的受力情况做了分析对比,分析双向张弦梁结构的受力特性。在研究了爆炸冲击荷载作用在双向张弦梁结构屋面板情况的基础上,提出了加强结构杆件强度,改变屋面板材料,加强节点强度,在结构滑移支座处添加阻尼器,合理设计结构形状,合理规划结构布置等抗爆方法,提高双向张弦梁结构的抗爆性能,为今后抗爆设计研究提供借鉴。
[Abstract]:Bi-directional string beam structure belongs to a new type of hybrid structure. It is a semi-rigid and semi-flexible structure between rigid structure and flexible structure, and this kind of structure has the advantages of light weight, strong bearing capacity, simple construction, good balance stability, beautiful structure and so on. At present, there are mainly single-layer spherical reticulated shell structure, cylindrical reticulated shell structure and double-layer spherical reticulated shell structure in the analysis of long-span spatial structure under explosive impact load. There is still a lack of research on the effect of explosive impact load on the roof space frame of two-way tensioned string beam structure. And in the anti-explosion aspect, our country also does not have the clear anti-explosion norm. At the same time, the two-way beam structure is also a public place with dense crowd activities, which is often the target of terrorist attacks. However, in the general design of long-span two-way string beam, the impact of explosion load on the structure is rarely considered, and the measures to ensure the safety performance of the structure are not clearly defined. Once the two-way string beam structure is impacted by explosion, the structure of the two-way string beam is affected by explosion. It will lead to greater economic losses and incalculable casualties. Therefore, it is necessary to study the dynamic response and structural stress variation of the two-way tension string beam under this special load, so as to improve the explosion-resistant safety of the structure. By establishing the simulation model of explosive explosion in air and comparing the peak value of overpressure wave at different distance from explosive to the empirical formula under the same condition, the correctness of numerical simulation with LS-DYAN/ANSYS software is proved. According to the propagation law of blast shock wave, various material parameter models of bar and roof slab of air, high explosive charge, two-way tension string beam structure are established. The dynamic response of two-way tension string beam structure under explosion impact load is analyzed. In this paper, the explosion of explosive at different heights above the center of two-way tensioned string beam and the displacement variation of structural members when the position of initiation point is transversely changed above the center of structure are studied, and according to the theory of explosion similarity law, The empirical formula of the overpressure wave peak value of the two-way tension string beam subjected to explosive impact load is fitted, and the strain variation rule of the bar under the eccentricity of the explosion impact load is concluded. On this basis, the two-way string beam structure subjected to explosive impact load is analyzed and compared with other long-span space structures, and the mechanical characteristics of the two-way string beam structure are analyzed. On the basis of studying the effect of explosive impact load on the roof slab of two-way tensioned string beam structure, it is put forward to strengthen the strength of structural members, change the material of roof slab, strengthen the strength of joints, and add dampers at the sliding support of the structure. The anti-explosion methods such as reasonable design of structure shape, reasonable layout of structure, and so on, can improve the anti-explosion performance of bi-directional string beam structure, and provide reference for future research on anti-explosion design.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU399
本文编号：2447580
[Abstract]:Bi-directional string beam structure belongs to a new type of hybrid structure. It is a semi-rigid and semi-flexible structure between rigid structure and flexible structure, and this kind of structure has the advantages of light weight, strong bearing capacity, simple construction, good balance stability, beautiful structure and so on. At present, there are mainly single-layer spherical reticulated shell structure, cylindrical reticulated shell structure and double-layer spherical reticulated shell structure in the analysis of long-span spatial structure under explosive impact load. There is still a lack of research on the effect of explosive impact load on the roof space frame of two-way tensioned string beam structure. And in the anti-explosion aspect, our country also does not have the clear anti-explosion norm. At the same time, the two-way beam structure is also a public place with dense crowd activities, which is often the target of terrorist attacks. However, in the general design of long-span two-way string beam, the impact of explosion load on the structure is rarely considered, and the measures to ensure the safety performance of the structure are not clearly defined. Once the two-way string beam structure is impacted by explosion, the structure of the two-way string beam is affected by explosion. It will lead to greater economic losses and incalculable casualties. Therefore, it is necessary to study the dynamic response and structural stress variation of the two-way tension string beam under this special load, so as to improve the explosion-resistant safety of the structure. By establishing the simulation model of explosive explosion in air and comparing the peak value of overpressure wave at different distance from explosive to the empirical formula under the same condition, the correctness of numerical simulation with LS-DYAN/ANSYS software is proved. According to the propagation law of blast shock wave, various material parameter models of bar and roof slab of air, high explosive charge, two-way tension string beam structure are established. The dynamic response of two-way tension string beam structure under explosion impact load is analyzed. In this paper, the explosion of explosive at different heights above the center of two-way tensioned string beam and the displacement variation of structural members when the position of initiation point is transversely changed above the center of structure are studied, and according to the theory of explosion similarity law, The empirical formula of the overpressure wave peak value of the two-way tension string beam subjected to explosive impact load is fitted, and the strain variation rule of the bar under the eccentricity of the explosion impact load is concluded. On this basis, the two-way string beam structure subjected to explosive impact load is analyzed and compared with other long-span space structures, and the mechanical characteristics of the two-way string beam structure are analyzed. On the basis of studying the effect of explosive impact load on the roof slab of two-way tensioned string beam structure, it is put forward to strengthen the strength of structural members, change the material of roof slab, strengthen the strength of joints, and add dampers at the sliding support of the structure. The anti-explosion methods such as reasonable design of structure shape, reasonable layout of structure, and so on, can improve the anti-explosion performance of bi-directional string beam structure, and provide reference for future research on anti-explosion design.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU399
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