在动力荷载作用下扣件式钢管支撑体系力学性能研究

发布时间：2018-04-11 19:00

本文选题：支撑体系 + 动力荷载　；参考：《长春工程学院》2017年硕士论文

【摘要】：随着高大建筑、大跨度建筑和都市大型基础设施项目不断出现,使得钢管支撑体系搭设高度不断增加,虽然已有大量学者对模板支架开展现场调查、试验和论证,模板支撑架相关事故依然存在。通过查找大量文献发现,大量学者在支撑架设计时主要是从静力性能方面研究,对于动力性能方面的研究很少。本文通过设计5种高度不同的架体,依据单因素分析法,从架体的高宽比、步距、剪刀撑设置方式及节点刚度等因素方面,针对支撑架施工过程中所存在的冲击荷载、风荷载、地震荷载进行研究,通过设定相关参数采用SAP2000对支撑体系进行模态分析来研究架体的自振频率,对架体进行风荷载、冲击荷载、地震作用下的时程分析来研究架体在动力荷载作用下的侧移、变形等相关力学性能参数、对架体进行屈曲分析来研究架体的极限承载力。通过以上的研究提出了架体自振频率的计算公式、极限承载力计算公式以及布料杆斜撑与模板面夹角公式;提供了保证实际工程施工时架体在动力荷载作用下稳定性的构造措施;证明施工过程中冲击荷载的存在是模板支撑体系发生迅速倒塌的原因。最后通过一个工程实例提出了BIM技术在模板支架方案设计中的优势,根据有限元及理论计算结果验证了风荷载及冲击荷载作用下加强薄弱环节的必要性。本文的研究将会推动模板支架研究工作的进一步进行,为以后的实际施工提供理论指导。
[Abstract]:With the emergence of large buildings, large span buildings and large urban infrastructure projects, the erection height of steel pipe bracing system has been increasing, although a large number of scholars have carried out field investigation, test and demonstration of the formwork support.Formwork support related accidents still exist.By looking up a large number of documents, it is found that a large number of scholars in the design of braces are mainly from the static performance of the research, the dynamic performance of the research is very little.In this paper, five kinds of frame with different heights are designed. According to the single factor analysis method, the impact load and wind load existing in the construction process of the support frame are analyzed from the aspects of the aspect of aspect of the aspect of the aspect of the aspect of the aspect such as the ratio of height to width of the frame, the step distance, the way of setting up the scissors brace and the joint stiffness.The seismic load is studied, the modal analysis of the bracing system is carried out by setting the relevant parameters, the natural vibration frequency of the frame is studied, and the wind load and impact load are carried out on the frame.The seismic time history analysis is used to study the lateral displacement and deformation of the frame under dynamic load, and the buckling analysis is carried out to study the ultimate bearing capacity of the frame.Through the above research, the formula of the natural vibration frequency, the ultimate bearing capacity and the angle between the inclined brace and the template surface of the frame are put forward.The structural measures to ensure the stability of frame body under dynamic load during construction are provided, and it is proved that the existence of impact load during construction is the reason for the rapid collapse of formwork bracing system.Finally, through an engineering example, the advantages of BIM technology in the design of formwork support scheme are put forward, and the necessity of strengthening weak links under wind load and impact load is verified by finite element method and theoretical calculation results.The research in this paper will promote the further research of formwork support and provide theoretical guidance for the practical construction in the future.
【学位授予单位】：长春工程学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU755.2

【相似文献】