受火浅圆钢拱的行为模拟及参数分析
发布时间：2018-10-20 07:45
【摘要】：当今社会飞速发展,应用于现代建筑中的大跨度钢结构样式越来越多,钢拱结构便是其中一类,此类型具有受力合理、变形小以及适合在大跨度结构中应用等优点,使其在工程中得到广泛的应用。但由于钢材本身的抗火性能较差,致使钢拱结构整体也不具备较强的抗火性能。钢拱在火灾下经常发生严重的平面内失稳,甚至出现平面外失稳破坏,因此钢拱的受火问题受到社会各界广泛关注。钢拱结构在火灾下的行为与梁、柱等构件在火灾下的受力性能存在本质区别,钢拱作为结构中非常重要的受力构件,进行火灾下钢拱的性能研究具有非常重要的现实意义。本文运用有限元软件对浅圆钢拱行为进行受火分析时,其中受火浅圆钢拱会发生平面外失稳和平面内失稳两种形式;其第一种是面外对钢拱结构的支撑刚度不够,发生时不仅存在面内的弯矩、轴力,还有侧向位移、扭矩以及翘曲应力,第二种是面外支撑足够的浅圆钢拱进行抗火研究时,其支座约束钢度用弹簧单元模拟,得出受火浅圆钢拱仍然会发生平面内跳跃失稳现象,而且在火灾下的行为发展过程分为三个阶段:轴压力增大阶段,轴压力减小阶段,跳跃阶段,还有一个特别重要的温度,即临界跳跃失稳温度,能够形象的反映火灾下浅圆钢拱平面内失稳特点。无论是面内还是面外失稳问题,浅圆钢拱都具有很好的潜在研究价值。本文将着重模拟平面内的浅圆钢拱行为发展过程,继而全面研究各个参数对火灾下浅圆钢拱行为的影响。考虑到以上几方面,本文的主要研究内容分为以下几个方面:(1)参考欧洲规范加以验证有限元的准确性并且运用有限元对受火浅圆钢拱进行不同单元类型、不同分析步模拟以及筒壳结构的模拟得出相应的结论。(2)基于有限元ABAQUS,对受火浅圆钢拱进行火灾下全过程响应及参数分析,得出火灾下浅圆钢拱仍然会发生面内跳跃失稳现象;同时分析载荷比、矢跨比(矢高和跨度)、长细比、屈服强度、荷载作用形式、拱轴截面尺寸等参数对其行为发展全过程的影响。通过以上分析,可以得出:不同条件下,受火浅圆钢拱的挠度和内力差异较大,载荷比和矢跨比、长细比对挠度及内力曲线具有较大的影响。
[Abstract]:Nowadays, with the rapid development of society, more and more large-span steel structures are used in modern buildings. The steel arch structure is one of them, which has the advantages of reasonable force, small deformation and suitable for application in long-span structures. It is widely used in engineering. However, due to the poor fire resistance of the steel itself, the steel arch structure as a whole does not have strong fire resistance. Steel arch often occurs serious instability in the plane under fire, even out of the plane instability, so the fire of steel arch has been widely concerned by all walks of life. The behavior of steel arch structure under fire is essentially different from that of beam column and other members under fire. As a very important component of structure steel arch is of great practical significance to study the behavior of steel arch under fire. In this paper, when the behavior of shallow round steel arch is analyzed by finite element software, there are two forms of out-of-plane instability and in-plane instability of shallow round arch, the first is that the out-of-plane support stiffness of steel arch is not enough. There are not only in-plane bending moment, axial force, lateral displacement, torque and warping stress. The second is that the bearing restrained steel degree is simulated by spring element when the shallow round arch with enough out-of-plane support is used to study the fire resistance. It is concluded that the phenomenon of in-plane jump instability will still occur in shallow round arch subjected to fire, and the behavior development process under fire can be divided into three stages: the stage of increasing axial pressure, the stage of decreasing axial pressure, the stage of jumping, and a particularly important temperature. That is the critical jump instability temperature, which can reflect the plane instability characteristics of shallow round arch under fire. In-plane and out-of-plane instability, shallow round arch has good potential research value. In this paper, the development process of shallow round arch behavior in plane is simulated, and the influence of various parameters on the behavior of shallow round steel arch under fire is studied. Considering the above aspects, the main research contents of this paper are as follows: (1) the accuracy of the finite element is verified by referring to the European Code and the different element types of the fire shallow round arch are carried out by using the finite element method. The corresponding conclusions are obtained by simulation of different analysis steps and shell structure. (2) based on finite element analysis (ABAQUS,), the whole process response and parameter analysis of shallow round arch under fire are carried out, and it is concluded that the phenomenon of in-plane jump instability will still occur in shallow round arch under fire; At the same time, the effects of load ratio, rise-span ratio (sagittal height and span), aspect ratio, yield strength, form of load action and section size of arch axis on the whole process of its behavior development are analyzed. Through the above analysis, it can be concluded that under different conditions, the deflection and internal force of shallow round arch are different greatly, the ratio of load to span, aspect ratio and aspect ratio have great influence on deflection and internal force curve.
【学位授予单位】：山东建筑大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU391
本文编号：2282504
[Abstract]:Nowadays, with the rapid development of society, more and more large-span steel structures are used in modern buildings. The steel arch structure is one of them, which has the advantages of reasonable force, small deformation and suitable for application in long-span structures. It is widely used in engineering. However, due to the poor fire resistance of the steel itself, the steel arch structure as a whole does not have strong fire resistance. Steel arch often occurs serious instability in the plane under fire, even out of the plane instability, so the fire of steel arch has been widely concerned by all walks of life. The behavior of steel arch structure under fire is essentially different from that of beam column and other members under fire. As a very important component of structure steel arch is of great practical significance to study the behavior of steel arch under fire. In this paper, when the behavior of shallow round steel arch is analyzed by finite element software, there are two forms of out-of-plane instability and in-plane instability of shallow round arch, the first is that the out-of-plane support stiffness of steel arch is not enough. There are not only in-plane bending moment, axial force, lateral displacement, torque and warping stress. The second is that the bearing restrained steel degree is simulated by spring element when the shallow round arch with enough out-of-plane support is used to study the fire resistance. It is concluded that the phenomenon of in-plane jump instability will still occur in shallow round arch subjected to fire, and the behavior development process under fire can be divided into three stages: the stage of increasing axial pressure, the stage of decreasing axial pressure, the stage of jumping, and a particularly important temperature. That is the critical jump instability temperature, which can reflect the plane instability characteristics of shallow round arch under fire. In-plane and out-of-plane instability, shallow round arch has good potential research value. In this paper, the development process of shallow round arch behavior in plane is simulated, and the influence of various parameters on the behavior of shallow round steel arch under fire is studied. Considering the above aspects, the main research contents of this paper are as follows: (1) the accuracy of the finite element is verified by referring to the European Code and the different element types of the fire shallow round arch are carried out by using the finite element method. The corresponding conclusions are obtained by simulation of different analysis steps and shell structure. (2) based on finite element analysis (ABAQUS,), the whole process response and parameter analysis of shallow round arch under fire are carried out, and it is concluded that the phenomenon of in-plane jump instability will still occur in shallow round arch under fire; At the same time, the effects of load ratio, rise-span ratio (sagittal height and span), aspect ratio, yield strength, form of load action and section size of arch axis on the whole process of its behavior development are analyzed. Through the above analysis, it can be concluded that under different conditions, the deflection and internal force of shallow round arch are different greatly, the ratio of load to span, aspect ratio and aspect ratio have great influence on deflection and internal force curve.
【学位授予单位】：山东建筑大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU391
【相似文献】
相关期刊论文 前1条
1 王大枚,姜武峰,施国伟;浅圆仓仓顶间歇喷淋隔热控温试验报告[J];吉林粮食高等专科学校学报;2005年01期
相关会议论文 前3条
1 杨善训;;浅圆仓储粮与管理[A];全面建设小康社会：中国科技工作者的历史责任——中国科协2003年学术年会论文集（上）[C];2003年
2 叶丹英;王大枚;钟六华;刘建辉;;三种防护剂用于浅圆仓储粮的生产性试验[A];中国粮油学会第二届学术年会论文选集（综合卷）[C];2002年
3 王若兰;田书普;谭叶;周晓军;郑超杰;;谷物冷却机在浅圆仓储粮中的应用研究[A];中国粮油学会第二届学术年会论文选集（综合卷）[C];2002年
相关硕士学位论文 前1条
1 孟宏伟;受火浅圆钢拱的行为模拟及参数分析[D];山东建筑大学;2017年
，本文编号：2282504
本文链接：https://www.wllwen.com/jianzhugongchenglunwen/2282504.html
