中小学单跨教学楼及连廊结构抗震加固方法研究

发布时间：2018-06-17 18:06

本文选题：单跨框架结构 + 抗震加固　；参考：《重庆大学》2014年硕士论文

【摘要】：5.12汶川地震中单跨教学楼框架结构的严重震害引起了广大科研工作者和工程设计人员的高度重视，为此我国抗震设计规范及相关规程进行了相继更新，明确规定乙类建筑不能采用单跨框架结构。然而我国尚有一大批既有单跨框架结构亟需抗震加固，如何对该类结构进行合理、有效的抗震加固仍是目前困扰工程界的主要难题之一，因此本文对适用于该类建筑增设钢筋混凝土剪力墙的抗震加固方案进行探索，力求为工程人员提供一个注重整体结构抗震性能且易于实施的加固设计思路。本文针对三栋钢筋混凝土单跨框架结构，即6度（0.05g）、8度（0.2g）按89规范设计的单跨教学楼框架结构以及7度（0.15g）单跨连廊框架结构实际工程，分别提出三种不同加固方案，并采用OpenSees软件建立了对应的结构分析模型，选取了一定数量的地震动，进行了多遇地震、设防地震和罕遇地震不同水平输入下的地震反应分析，同时考察了由于抗震墙的增加而导致原框架构件的内力和配筋的变化规律，，在此基础上，提出了单跨教学楼和单跨连廊框架结构的抗震加固方案的建议。本文研究工作表明，不同烈度结构抗震加固中剪力墙设置规律有所不同，即6度区单跨教学楼当增设剪力墙承担的地震倾覆力矩大于总地震倾覆力矩的50%时，结构在不同地震输入下的抗震性能就能满足规范要求；对于8度区单跨教学楼，除满足地震倾覆力矩要求，还须满足层间位移角限值，且后者起控制作用。增设抗震墙后，虽然改善了整体结构的抗震性能，但亦造成某些既有构件的配筋需求增大。尤其是8度区结构，随着抗震墙墙肢长度的增加，导致更多的既有构件承载能力不足而需要加固。对于7度区多层单跨框架连廊，受其抗震墙布置方式和数量的影响，墙肢长度的少量增加反而引起整体结构层间变形的增大，按改变框架结构形式的最短墙长加固更为合理有效，且加固对原框架结构中梁柱构件的计算配筋影响较小。
[Abstract]:The serious earthquake damage of single-span teaching building frame structure in the Wenchuan earthquake caused great attention by the majority of scientific research workers and engineering designers. Therefore, the seismic design code and related regulations of our country have been updated one after another. It is clearly stipulated that no single span frame structure can be used in class B buildings. However, there is still a large number of existing single-span frame structures in our country, which are in urgent need of seismic reinforcement. How to carry out reasonable and effective seismic reinforcement of this kind of structures is still one of the main problems puzzling the engineering circle at present. So this paper explores the aseismic reinforcement scheme which is suitable for adding reinforced concrete shear wall to this kind of building, and tries to provide an idea of strengthening design which pays attention to the seismic behavior of the whole structure and is easy to carry out. This paper presents three different reinforcement schemes for three reinforced concrete single-span frame structures, I. e., the frame structure of single-span teaching building designed according to 89 code and the frame structure of single-span continuous corridor with 7 degrees or 0.15g, which are designed according to the code 89. The corresponding structural analysis model is established by using OpenSees software, and a certain number of ground motions are selected to analyze the seismic response under the different horizontal inputs of frequent earthquake, fortification earthquake and rare earthquake. At the same time, the internal force and reinforcement of the original frame members due to the increase of seismic walls are investigated. On this basis, suggestions for seismic reinforcement of single-span teaching building and single-span continuous corridor frame structure are put forward. The research results show that the law of shear wall setting is different in seismic reinforcement of different intensity structures, that is, when the shear wall is added to the teaching building with single span in 6 degrees, the seismic overturning moment is larger than that of the total seismic overturning moment, and when the shear wall is added, the seismic overturning moment is larger than the total seismic overturning moment. The seismic behavior of the structure under different earthquake input can meet the requirements of the code, and for the single-span teaching building in the 8-degree region, the limit of displacement angle between floors should be satisfied in addition to the seismic overturning moment requirement, and the latter plays a controlling role. After the addition of seismic walls, the seismic performance of the whole structure is improved, but the reinforcement demand of some existing members is increased. With the increase of the length of the wall limb, more and more existing members need to be strengthened because of the insufficient bearing capacity of the existing members. For the multi-story single-span frame corridor in 7 degree region, due to the influence of the arrangement and quantity of the seismic wall, the small increase of the length of the wall limb will result in the increase of the whole structure interstory deformation. It is more reasonable and effective to strengthen with the shortest wall length according to changing the form of frame structure, and the reinforcement has little effect on the calculation of Liang Zhu members in the original frame structure.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU746.3;TU352.11

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