山地RC掉层框架结构地震损伤评估及耗能机制分析

发布时间：2018-07-12 09:03

本文选题：RC掉层框架结构 + 非线性分析　；参考：《重庆大学》2016年硕士论文

【摘要】：我国是一个多山地、多丘陵的国家,掉层框架结构在山地建筑中应用最为广泛。由于掉层框架结构的特殊接地方式—不等高接地,使结构存在严重的竖向不规则问题,导致其受力性能比普通框架结构要复杂得多。汶川震害调查显示,山地建筑结构都存在不同程度的破坏,目前针对普通框架结构地震损伤及耗能的研究较多,专门针对山地建筑结构地震损伤及耗能分配机制的研究却相对较少,所以开展平面掉层框架结构和空间掉层框架结构的地震损伤与耗能分配机制研究具有重要的意义。本文以8度0.2g区掉不同层数的RC平面框架结构和空间框架结构为研究对象,基于非线性分析软件Perform-3D,分析了结构基于构件层次、楼层层次及整体层次的地震损伤情况,并对结构的耗能分配机制进行了深入研究。通过本文的研究,得到的主要结论如下:1.针对平面掉层框架结构:梁的损伤指数普遍大于柱的,形成“强柱弱梁”破坏机制;位于上接地层接地跨梁的损伤程度比其它位置的梁严重,柱损伤最严重的部位是上接地柱,且内侧各层柱的损伤程度普遍比外侧柱严重。上接地层的层损伤指数普遍最大,损伤严重。不论是基于构件层次还是楼层层次,掉层部分的损伤指数均很小,基本无损伤或轻微损伤。2.针对空间掉层框架结构:双向地震作用下,结构中有部分梁的损伤指数大于柱,部分梁的损伤指数小于柱,形成“强梁弱柱”破坏机制,与平面掉层结构显著不同;沿X方向,位于上接地层接地跨梁的损伤较严重,上接地柱及其上一层的内侧下接地柱的损伤严重,且各层内侧上接地柱的损伤指数普遍比外侧上接地柱的大,说明内侧上接地柱的损伤较严重。上接地层的损伤最严重,随着楼层的增加,层损伤指数逐渐减小,损伤程度越来越轻;掉层部分的层损伤指数很小。3.通过对比Park-Ang、Kunnath和Lu-Wang三种双参数地震损伤模型计算的损伤指数,发现Park-Ang损伤模型计算的构件损伤指数、层损伤指数和整体损伤指数普遍大于Kunnath和Lu-Wang损伤模型。4.在平面掉层框架结构和空间掉层框架结构中,上接地层吸收耗散的能量最多,为主要的耗能楼层,随着楼层的增加,层间滞回耗能百分比fi?逐渐减小。对平面掉层结构而言,梁为主要的耗能构件,而在空间掉层结构中,柱的耗能增加,成为主要的耗能构件。结构边跨梁的耗能大于中跨梁,且边跨梁外侧的耗能多于其内侧的耗能;随着结构楼层的增加,中柱吸收的能量逐渐增加,边柱则逐渐减小;在上接地层以上,随着楼层的增加,柱上端吸收的能量普遍逐渐增加,顶层柱下端吸收的能量很少。
[Abstract]:China is a mountainous and hilly country. Due to the special earthing mode of falling floor frame structure, which is not equal to the ground height, there is a serious vertical irregular problem in the structure, and the mechanical performance of the structure is much more complicated than that of the common frame structure. The investigation of Wenchuan earthquake disaster shows that there are different degrees of damage to the structure of mountain buildings. At present, there are more researches on seismic damage and energy dissipation of common frame structures. The research on seismic damage and energy dissipation mechanism of mountain building structure is relatively few, so it is of great significance to study the seismic damage and energy dissipation mechanism of plane floor frame structure and spatial falling floor frame structure. This paper takes the RC plane frame structure and the spatial frame structure with different layers in the 8 degree 0.2g area as the research object. Based on the nonlinear analysis software Perform-3D, the seismic damage of the structure based on the component level, the floor level and the whole level is analyzed. The energy dissipation allocation mechanism of the structure is also studied. Through the study of this paper, the main conclusions are as follows: 1. In view of plane falling frame structure: the damage index of beam is generally larger than that of column, which forms the failure mechanism of "strong column and weak beam"; the damage degree of earthing span beam located in the upper grounding layer is more serious than that of other positions, and the most serious damage part of column is the upper earthing column. The injury degree of the medial column was generally more serious than that of the lateral column. The damage index of the upper ground layer is generally the largest and the damage is serious. Regardless of whether it is based on the component level or the floor level, the damage index of the falling layer is very small, basically no damage or slight damage. 2. The damage index of some beams is larger than that of columns, and the damage index of some beams is smaller than that of columns under the action of bi-directional earthquake, forming the failure mechanism of "strong beam and weak column", which is obviously different from plane falling structure, along X direction, the damage index of some beams is larger than that of column, and the damage index of part of beam is smaller than that of column. The damage of the earthing span beam in the upper grounding layer is more serious, the damage of the upper earthing column and the inner and lower earthing post of the upper layer is serious, and the damage index of the inner earthing post in each layer is generally larger than that of the outer earthing post. It shows that the damage of the inner earthing post is more serious. The damage of the upper ground layer is the most serious, with the increase of the floor, the damage index of the layer decreases gradually, and the damage degree becomes lighter and lighter, and the damage index of the falling layer is very small. 3. By comparing the damage index calculated by Park-Angn Kunnath model and Lu-Wang damage model, it is found that the damage index, layer damage index and global damage index calculated by Park-Ang damage model are generally larger than those calculated by Kunnath and Lu-Wang damage models. In the plane floor frame structure and the spatial floor frame structure, the upper ground layer absorbs the most dissipated energy, which is the main energy dissipation floor. With the increase of floor, the percentage of energy dissipation between layers hysteretic energy consumption? Gradually decrease. For plane floor structure, beam is the main energy dissipation component, while in space falling structure, the energy consumption of column increases and becomes the main energy dissipation member. The energy consumption of the side span beam is larger than that of the middle span beam, and the energy consumption on the outside of the side span beam is more than that on the inside; with the increase of the floor of the structure, the energy absorbed by the middle column increases gradually, and the side column decreases gradually. With the increase of the floor, the energy absorbed by the upper end of the column is gradually increased, and the energy absorbed by the lower end of the top column is very little.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TU375.4

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