节点文献
框架—混合筒体结构动力特性研究
【作者】 李建平；
【导师】 阎奇武；
【作者基本信息】 中南大学 ， 结构工程， 2010， 硕士
【摘要】 钢-混凝土混合结构可以充分发挥钢结构和钢筋混凝土结构二者各自的特长,具备成本低、经济性能好、施工速度快等特点,已逐渐成为我国高层特别是超高层建筑的主要结构形式之一。带钢-混凝土组合连梁的框架-混合筒体结构是一种新型结构。对带钢-混凝土组合连梁的框架-混合筒体结构动力特性进行深入研究,了解结构本身所固有的属性,不仅可为这类结构的设计、相关规程的制定提供依据、并可为进一步推广使用打下基础。论文的研究内容主要包括如下四个方面：1.在该课题已取得的研究成果(组合节点、混合双肢剪力墙)基础上,提出了缩尺为1/5的10层框架-混合筒体整体模型结构的试验方案,利用脉动法测试得到结构相应各测点的加速度脉动时程反应。2.利用专业软件DASP分析试验结果,得到模型结构在有、无配重两种情况下的自振频率(周期)、振型和阻尼比,根据动力相似原则,利用配重后模型结构的动力特性推导出原型结构的动力特性,为新型结构体系提供了现场测试的资料。3.在模型试验的基础上,依据结构动力分析的基本理论,借助大型有限元软件ANSYS,建立原型结构在不同活荷载折减系数下的三维空间有限元分析模型,对结构进行模态分析,提取原型结构的动力特性,将计算结果与试验结果进行比较,确定框架-混合筒体结构在计算地震作用时重力荷载代表值中的活荷载折减系数建议值,分析误差产生的原因,并验证了计算模型和计算方法的正确性和可靠性。4.以本文建立的计算模型为基础,仍利用有限元程序ANSYS分析,改变程序参数讨论四种不同影响因素,即活荷载折减系数、连梁型式、混凝土强度等级、筒体刚度对框架-混合筒体结构的动力特性的影响。
【Abstract】 Fully taking the advantages of both steel and reinforced concrete structure and possessing good characteristics,such as low cost、good economic performance、quick speed of construction、etc, steel-concrete hybrid structure has become one of the main high-rise structures in our country, especially super high-rise buildings. Frame-hybrid tube structure with steel-concrete composite coupling beam is one kind of new structure. Researching dynamical characteristics of frame-hybrid tube structure with steel-concrete composite coupling beam,which will make us understand the inherent attribute of structure itself, will be the basis for design of such structures and the formulation of relevant regulations, and also will be the foundation on further promoting such structures. The main research contents include the following four areas as followings:1. Based on the summary research results in the past (the composite joint、hybrid coupled shell wall), this paper proposes the frame-hybrid tube structure experimental plan of 1/5 scale model, then by testing of ambient vibration, acceleration pulse time history of the measuring points is received.2. With analysis of professional software DASP, natural vibration frequency (period)、vibration mode and damping ratio of model structure with the counter-weights or not are obtained,according to the principle of dynamic similarity, dynamical characteristics of model structure with the counter-weights can deduce dynamical characteristics of archetypal structure,which provides a field test information for a new structure.3. Based on the model experiment, according to the fundamental theory of the structure’s dynamic analysis and using finite element software ANSYS, A three-dimensional finite element analysis model is established under the different live load reduction factors, the modal analysis of finite element model is conducted, the dynamical characteristics of archetypal structure are obtained, furthermore, by comparing the results of the test results and numerical simulation calculation, advised datum of the live load reduction factor is determined in calculating the seismic action of the gravity load value, the causes of error are analyzed and the correctness of this model and the computational method are confirmed.4. Based on the finite element model in this paper and using finite element software ANSYS, four different factors about live load reduction factor、coupling beam、concrete strength grade、stiffness of tube are discussed, which are aimed at summarize variation of structural dynamical characteristic.