【作者】 邢君；

【导师】 孙洪泉； 鞠杨；

【作者基本信息】 河北工业大学 ， 结构工程， 2004， 硕士

【摘要】 本文对钢筋混凝土结构地震倒塌机制的问题进行了论述，认为钢筋混凝土框架结构的倒塌破坏过程是一个结构发生损伤并不断积累演化的过程，因此通过研究框架构件和整体结构在地震力作用下的损伤积累来揭示其倒塌破坏的过程。 为了定量描述结构在地震过程中不同时刻的损伤值大小，本文从结构耗能的角度出发，提出了基于弹性变形能的损伤指标，该损伤指标对研究截面、构件和整体结构三个层次上的损伤均适用。针对地震力作用下钢筋混凝土框架结构梁柱的受力特性，对框架进行动力分析时将梁柱构件简化为五段变刚度杆单元，将基于弹性变形能的损伤指标推广到杆件，建立了该五段变刚度杆单元的损伤模型。本文将钢筋混凝土框架结构简化为杆系模型，建立了考虑刚度退化的杆件截面层次上的三线型恢复力模型，并以结构形成机械较机构作为框架倒塌破坏的判断准则。基于本文提出的理论和计算方法，笔者用Visual C++语言编制了计算截面恢复力模型及结构在地震力作用下不同时刻损伤值的相应程序，实现了地震力作用下钢筋混凝土框架结构倒塌过程的数值模拟。 最后，以一个三层两跨的钢筋混凝土框架为例，应用作者自编的程序计算了循环荷载作用下该框架结构在不同时刻的损伤值，并给出了其不同构件及整体结构的损伤演化曲线，揭示了循环荷载作用下钢筋混凝土框架结构的损伤演化规律，为地震力作用下钢筋混凝土结构的倒塌机制问题的研究提供了依据。更多还原

【Abstract】 The mechanism of collapse of reinforced concrete structure is discussed. It is believed the collapse of reinforced concrete framework is a process in which the structure undergoes damage and the damage accumulate ceaselessly. So through the study of damage accumulation of framework element and whole structure in earthquake can learn its collapsing process.In order to describe the damaging value of structure under earthquake, the damage parameters based on elastic transformative energy is proposed, which is used to study the damage on section ,component and the whole structure. During dynamic analysis of framework, according to mechanical performance of reinforced concrete frame structure under seismic force, the element of beam and column can be simplify into 5 pole element whose stiffness is variable. Then damage model of 5 pole elements with variable rigidity can be established if the damage parameters based on elastic transformative energy are generalized into pole elements. In this paper the reinforced concrete frame is simplified into pole model and hysteretic model in pole section with consideration of reduced stiffness. The failure criteria is whether the structure has formed mechanical angle.On the basis of the theory and computing method in this paper, the author worked out corresponding program to compute hysteretic model on section and damage value of the structure under seismic force at different time. Then the numerical simulation of the collapsing process of reinforced concrete structure is thus realized.At last, take a three-storeyed and two-span reinforced concrete frame as example, its damage value under cyclic load at different time is computed by the program. And the damage evolution curve of different element and whole structure is also obtained. As result the damage evolution law of reinforced concrete structure under cyclic load is found, which provides basis for the study of collapsing mechanism of reinforced structure under seismic force.更多还原