【作者】 邓志恒；

【导师】 秦荣；

【作者基本信息】 广西大学 ， 结构工程， 2002， 博士

【摘要】 本文根据结构控制理论概念及预应力混凝土结构体系、巨型框筒结构体系、悬挂结构体系、简体结构体系的受力特征，提出预应力巨型框筒悬挂阻尼控制结构新体系。本文首先从概念上分析了这种结构体系的受力特性，探讨了巨型框架梁柱的可能配筋形式，提出了这种结构体系值得研究的若干关键问题。本文重点在预应力巨型框筒悬挂阻尼控制体系抗震抗风性能及结构控制、混凝土收缩徐变对预应力巨型框筒悬挂体系的影响及分析方法、预应力巨型框架节点三方面进行了研究。 在结构体系动力响应分析及结构控制研究方面，本文分析了悬挂结构体系的减震原理及结构控制方法，建立了结构体系的结构控制模型，采用随机振动方法和动力时程方法对结构体系进行了动力分析，并与支承式巨型框架体系进行了分析比较，分析结果表明预应力巨型框筒悬挂阻尼控制体系具有良好的减振性能，影响巨型框筒悬挂阻尼控制体系控制效果的主要因素是悬挂结构质量、吊杆刚度及连接方式、弹簧阻尼控制的刚度K_d及阻尼C_d。在悬挂楼层设置弹簧阻尼器可以有效控制悬挂楼层在正常使用状态下的水平位移，以及在受震状态下过大的水平侧移，大大减小巨型框架柱的地震水平力。本文提出了巨型框筒部分悬挂结构体系的设计概念，分析表明，在结构体系1～3层设置悬挂楼层，可充分发挥悬挂楼层的减震作用，为预应力巨型框筒悬挂阻尼控制体系开拓了一条新的应用途径。本文采用Davenport风速谱对结构体系进行了风荷载作用下的随机振动分析，分析表明，自由悬挂楼层在风振作用下产生较大的位移方差和加速度方差，影响正常使用要求。本文提出的控制方法，即增大阻尼器刚度，可有效控制风振作用下悬挂楼层的动力响应。 在收缩徐变对结构体系的影响及分析方法研究方面，本文在总结分析国内外有关混凝土收缩徐变特性及其计算理论研究的基础上，引入施工过程分析收缩徐变对结构体系的影响。根据徐变力学基本方程及中值系数法推导出考虑应 广西大学惧士学位论文＿力变化、弹性模量随龄期变化以及钢筋对收缩徐变影响的任意截面双向偏心受问———‘“”“”—————’—””‘”‘——’“———”“—‘’“———””——一”“””————一刀’”一—－ 压构件收缩徐变对截面内力重分布影叼的计算公式。基于巨型框简结构体系在 竖向荷载作用下的受力特点，推导出考用施工过程及钢筋影响的巨型框筒悬挂 结构体系收缩徐变方程。基于施工过程及收缩徐变与时间密切相关的特点，建 立了竖向变形计算公式。应用本文公式对巨型框倚悬挂结构体系进行了算例分 析，计算结果表明，巨型结构体系由于具有楼层水平刚度大的特点产生较大的 竖向变形和附加内力，设计时必须考用这一因素的彤响。计算结果还表明，不 考虑施工建造过程变形的计算结果误差很大。 在预应力巨型框架节点研究方面，本文首次对配有圆形钢管的用骨混凝土 柱预应力泪凝土梁的巨型框架节点模型进行了试验研究，试验结果表明本文提 出的节点设计方法是可靠的，节点能够有效地传通梁端弯矩和剪力，节点具有 良好的抗震性能，在低周期反复荷载作用下圆形钢管与外部钢管混凝土能够有 效地共同工作，节点延性好，耗能能力强，钢管有效约束节点核心混凝土，延 缓节点区斜裂缝开展。本文节点设计方法解诀了配有圆形钢管的钢骨混凝土柱 与预应力混凝土梁有效结合的技术关键，为这种结构形式的应用提供了试验依－据。本文提出的收缩徐变分析方法及节点研究成果也适用于一般高层建筑结构， 可供工程设计参考。更多还原

【Abstract】 In this paper, based on concepts of the structure control theory and the behavior of prestressed concrete system, mega-frame-tube structural system, suspended system and tube structural system, a new structural system composed of prestressed mega-frame-tube suspended damper control structure is presented. At first, the working behavior of this structural system is analyzed in terms of concepts, possible placing styles of steel bars in beams and columns of mega-frame structure are studied and some key problems worthy of being studied of this structural system are put forward. The wind-resistant behavior and aseismic behavior of the prestressed mega-frame-tube suspended damper control structural system, the effect of structural control and concrete shrinkage creep on this system and its analyses methods, and the prestressed mega-frame connections are especially studied in this paper.In the aspect of the analysis about dynamic response and the study on structural control, the aseismic principle of the suspended structural system and its structure control methods are analysed, a control model of the system is established, the structural system is dynamicly analysed using random vibration method and dynamic time-history method. And the prestressed mega-frame-tube suspended damper control structural system has perfected a seismic performance compared with supported mega-frame system. The main factors that the control effect of the prestressed mega-frame-tube suspended damper control structural systeminclude the mass of the suspended structure, the stiffness and the connection of suspenders, the stiffness(A^) and the damping(Q) of spring damper control. The installation of spring damper in suspended floors can effectively control both the horizontal displacement of suspended floors at serviceability limit state and their too large horizontal displacement under earthquake, and it can greatly reduce the horizontal seismic force of mega-frame columns as well. The paper raise the design concepts of mega-frame-tube suspended structural system, and analyses show that the arrangement of suspended floors at 1st ~ 3rd story can greatly exhibit the a seismic behavior of suspended floors, which offers a new practical path for the prestressed mega-frame-tube suspended damper control structural system. Using Davenport wind velocity spectrum, this paper analyzes the random vibration of the structural system subjected to wind loads, and the results predict that the free suspended floors makes large standard deviation of both displacement and acceleration, which influence normal use requirement. The control methods that increasing the stiffness of dampers, can effectively control the dynamic response of suspended floors to wind vibration.In the aspect of studies the influence of shrinkage creep on the structural system and its analysis methods, based on analyzing theoretic studies on concrete shrinkage creep behavior and its calculating, construction is introduced to analyze the influence of shrinkage creep on structural system for the first time. According to the fundamental equation methods of creep mechanics and the mid-parameter method, this paper derives a formula for evaluating the effect of the shrinkage creep of arbitrary section in two-way eccentric compressed members on the redistribution of its inner force, considering the variation of stress, the variation of elastic modulus in different age, and the influence of reinforcement on shrinkage creep. Based on the property of the mega-frame-tube structural system under vertical loads, the shrinkage creep equation of mega-frame-tube suspended structural system isbrought forward, considering the effect of construction and reinforcement. Based on the property that construction and shrinkage are quite relative with time, a formula for calculating vertical deformation is proposed. The formulae presented in this paper have been applied to calculate the mega-frame-tube suspended structural system, and the results indicate that giant structural system makes great vert更多还原