梁端底筋锚入式预制梁柱连接节点抗震性能研究

发布时间：2018-05-19 16:48

本文选题：装配式混凝土框架 + 锚固与搭接　；参考：《东南大学》2017年博士论文

【摘要】：在我国建筑业转型升级的新形势下,装配式混凝土结构较为契合我国建筑产业现代化的内涵,成为了我国新型建筑工业化发展的重要方向和突破点,也是行业关注与研究的热点。在各类装配式混凝土结构体系中,遵循"等同现浇"理念的装配式混凝土结构以其相对容易的可实现性得到了最广泛的应用。然而,目前付诸应用的装配式混凝土框架结构体系普遍存在着精度加工要求高、适用性不足、施工建造不便等问题,这大大抵消了装配式混凝土框架结构的应用优势。因此,在工业化建筑结构建造向高效施工方向发展的趋势下,装配式混凝土框架结构急需进一步改进。为进一步提高装配式混凝土框架结构建造效率,降低生产成本,实现装配式混凝土框架结构高效施工,本文对采用"大直径、少根数"思路的新型锚固与附加钢筋搭接混合连接进行了抗震性能研究,同时提出了"高强度、小直径"的新型部分高强筋预制装配式框架梁柱连接并开展了抗震性能研究。论文的主要工作及成果如下:(1)基于装配式混凝土框架梁柱连接的内力传递方式,提出了新的预制梁柱连接分类方法,分别为直接传力连接、间接传力连接和混合传力连接三类,并对既有的各种预制梁柱连接进行了归类和梳理。(2)开展了两类梁端底筋锚入式预制梁柱连接低周反复试验研究,试件包括一个现浇对比试件,两个新型锚固与附加钢筋搭接混合连接试件和两个新型部分高强筋预制装配式框架梁柱连接试件。系统分析试验结果,包括破坏形态、滞回曲线、骨架曲线、强度、变形能力、刚度退化、耗能能力等;结果表明,两类梁端底筋锚入式预制梁柱连接试件均表现出不弱于现浇试件的抗震性能。(3)采用有限元分析软件ABAQUS建立了有限元模型,并将分析结果与试验结果对比,来验证有限元模型对试验结果的再现性。基于有限元模型,通过参数变化分析,进一步分析不同参数对梁端底筋锚入式预制梁柱连接抗震性能的影响。(4)针对梁端底筋锚入式预制梁柱连接低周反复试验结果,系统分析和研究了试件的塑性铰。考虑低周反复荷载作用的特点,提出了考虑拉压反复作用的混凝土损伤塑性铰长度取值办法,得出了各试件塑性铰试验长度;提出了本文修正的塑性铰长度计算模型,适用于预制混凝土构件,填补了目前对预制构件塑性铰长度研究的空白。(5)基于理论分析和试验结果拟合,建立梁端底筋锚入式预制梁柱连接试件的静力计算模型和恢复力模型。通过与试验曲线的对比,建立的计算模型结果可较好地反映梁端底筋锚入式预制梁柱连接的受力特点和滞回特性。通过上述试验研究与理论分析工作,对梁端底筋锚入式预制梁柱连接的抗震性能有了较为深入的了解,形成了一定的基础试验数据和初步的理论模型,为该类装配式混凝土框架结构进一步研究和应用奠定了基础。
[Abstract]:Under the new situation of China's construction industry transformation and upgrading, the prefabricated concrete structure accords with the connotation of the modernization of China's construction industry, and has become an important direction and breakthrough point for the development of new construction industrialization in China. Also is the industry concern and the research hot spot. In all kinds of prefabricated concrete structures, the prefabricated concrete structures, which follow the concept of "equal cast-in-place", have been widely used for their relatively easy realizability. However, there are many problems such as high precision requirement, insufficient applicability and inconvenient construction, which greatly offset the advantages of prefabricated concrete frame structure. Therefore, under the trend of the construction of industrial building structure to the direction of efficient construction, the prefabricated concrete frame structure is in urgent need of further improvement. In order to further improve the construction efficiency of prefabricated concrete frame structure, reduce the production cost and realize the efficient construction of prefabricated concrete frame structure, this paper adopts "large diameter", The aseismic performance of a new type of Anchorage and additional steel lapped joint is studied, and a new type of "high strength, small diameter" prefabricated frame Liang Zhu connection with "high strength and small diameter" is put forward, and the seismic performance is also studied. The main work and results of this paper are as follows: (1) based on the internal force transfer method of Liang Zhu connection of prefabricated concrete frame, a new classification method of prefabricated Liang Zhu connection is proposed, which includes direct force transfer connection, indirect force transfer connection and hybrid force transfer connection. At the same time, the existing prefabricated Liang Zhu connections are classified and combed. (2) the low cycle repeated tests of two kinds of beams with bottom reinforcement anchor type prefabricated Liang Zhu connections are carried out. The specimens include a cast-in-place contrast specimen. Two new types of anchoring and additional reinforcing bar lapped joint specimens and two new type of prefabricated Liang Zhu connection specimens with partial high strength tendons are introduced in this paper. The experimental results, including failure form, hysteretic curve, skeleton curve, strength, deformation ability, stiffness degradation, energy dissipation capacity, etc. The aseismic behavior of the two kinds of prefabricated Liang Zhu connections with bottom reinforcement anchor is not weaker than that of cast-in-place specimens. The finite element model is established by using the finite element analysis software ABAQUS, and the results are compared with the test results. To verify the reproducibility of the finite element model to the test results. Based on the finite element model, the influence of different parameters on the seismic behavior of Liang Zhu connections with anchor at the end of beam end is further analyzed by means of parameter change analysis. (4) aiming at the low cycle repeated test results of prefabricated Liang Zhu connections with bottom tendons at the end of beams, The plastic hinge of the specimen is analyzed and studied systematically. Considering the characteristics of low cycle cyclic loading, a method of determining the length of damaged plastic hinge of concrete considering the repeated action of tension and compression is put forward, and the test length of plastic hinge of each specimen is obtained, and the modified model for calculating the length of plastic hinge in this paper is put forward. Based on the theoretical analysis and experimental results fitting, the static calculation model and the restoring force model of the precast Liang Zhu connection specimens with beam bottom reinforcement anchor are established, which are suitable for precast concrete members and fill the blank in the study of the plastic hinge length of the prefabricated members. By comparing with the test curve, the calculated results can well reflect the mechanical characteristics and hysteretic characteristics of the prefabricated Liang Zhu connections with bottom reinforcement at the end of the beam. Based on the above experimental research and theoretical analysis, the seismic performance of pre-fabricated Liang Zhu connections with bottom reinforcement at the end of the beam is deeply understood, and a certain basic test data and a preliminary theoretical model are formed. It lays a foundation for further research and application of this kind of prefabricated concrete frame structure.
【学位授予单位】：东南大学
【学位级别】：博士
【学位授予年份】：2017
【分类号】：TU352.11;TU375.4

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