超长混凝土结构后浇带施工技术研究
发布时间：2019-05-07 13:10
【摘要】：随着社会经济的发展，，超长混凝土结构在我国的应用越来越多，而由于建筑功能上的需要，要求结构中少设甚至不设变形缝。但是，超长混凝土结构一般不能采取一次浇筑成型，而是分段浇筑，后浇带法在此时就得到了很好的应用和发展。当前，后浇带法的工程实践经验要远远领先于理论的研究，设计人员大都在设计时参考已有工程实践经验，甚至完全参照已有工程做法，未经过仔细分析研究，结构在使用中不但达不到控制裂缝的目的，反造成裂缝的大量出现，为建筑的后期使用带来诸多问题。 本文在总结前人大量研究成果的基础上，对研究较少的设置后浇带的框架结构抗震性能进行试验研究。主要工作有以下几个方面： 首先介绍后浇带在超长混凝土结构中的作用原理，并对超长混凝土结构后浇带在国内外的研究现状进行系统总结和分析。 借鉴前人研究成果，从横穿后浇带的钢筋、后浇带设置形式、后浇带的处理方式和建筑结构形式四个方面，详细总结和分析了影响后浇带在超长混凝土结构中发挥有效作用的因素，为全面理解和应用后浇带提供理论基础。 通过对5榀设置后浇带框架和整浇框架的拟静力试验，研究了后浇带处纵筋贯通、顶部纵筋搭接和梁腹增设纵向附加钢筋对框架抗震性能的影响，对框架的破坏形态、滞回曲线、骨架曲线、变形能力、刚度退化、耗能能力、变形恢复能力等进行了对比分析。试验结果表明，后浇带新旧混凝土接缝面较易形成贯通裂缝，通过增加梁腹纵向附加钢筋可有效地避免裂缝贯通整个截面；后浇带处增加纵向附加钢筋对框架抗震性能影响最为显著，对框架耗能能力、变形能力起到积极作用，但加速了框架的刚度退化以及增加了框架的残余变形；后浇带处钢筋搭接对框架耗能能力稍有提高，加速了框架刚度退化以及增加了框架残余变形，但对框架的其它抗震性能影响不明显；后浇带处钢筋贯通对框架的刚度退化和残余变形有一定的不利影响，对框架延性有一定的提高作用，但对框架耗能能力影响甚微。
[Abstract]:With the development of social economy, the application of super-long concrete structure in our country is more and more. However, due to the need of building function, there are few or no deformation joints in the structure. However, the super-long concrete structure can not be cast once, but by sections, and the post-pouring belt method has been well applied and developed at this time. At present, the engineering practical experience of the post-pouring belt method is far ahead of the theoretical research. The designers mostly refer to the existing engineering practical experience in the design, even refer to the existing engineering practice completely, without careful analysis and research. The structure not only can not achieve the purpose of controlling the crack, but also causes a large number of cracks, which brings many problems for the later use of the building. In this paper, on the basis of summarizing a large number of previous research results, the seismic behavior of frame structures with few post-cast-in-place belts is studied experimentally. The main work is as follows: firstly, the working principle of the post-pouring belt in the super-long concrete structure is introduced, and the research status of the post-pouring belt of the super-long concrete structure at home and abroad is summarized and analyzed systematically. Referring to the previous research results, this paper discusses four aspects: the steel bar that passes through the post-pouring belt, the setting form of the post-pouring belt, the treatment mode of the post-cast-in-place belt and the form of the building structure. This paper summarizes and analyzes in detail the factors that affect the effective role of the post-pouring belt in the super-long concrete structure, which provides a theoretical basis for the comprehensive understanding and application of the post-cast-in-place belt. Based on the quasi-static tests of five post-cast-in-place frames and whole-cast frames, the effects of longitudinal reinforcement at the post-cast-in-place, the overlap of the top longitudinal reinforcement and the addition of longitudinal additional reinforcement on the seismic behavior of the frame and the failure pattern of the frame are studied. The hysteretic curve, skeleton curve, deformation capacity, stiffness degradation, energy dissipation capacity, deformation recovery ability and so on are compared and analyzed. The experimental results show that the new and old concrete joints of the post-cast-in-place belt are easy to form through cracks, and the cracks can be effectively avoided through the whole section by adding longitudinal reinforcement to the ventral of the beam. The addition of longitudinal reinforcement at the post-cast-in-place has the most significant effect on the seismic behavior of the frame, and plays a positive role in the energy dissipation and deformation capacity of the frame, but it accelerates the stiffness degradation of the frame and increases the residual deformation of the frame. The lapping of steel bars at the post-cast-in-place has slightly improved the energy dissipation capacity of the frame, accelerated the degradation of the frame stiffness and increased the residual deformation of the frame, but has little effect on the other seismic behavior of the frame. The reinforcement penetration at the post-cast-in-place has a certain adverse effect on the stiffness degradation and residual deformation of the frame, and has a certain effect on the ductility of the frame, but has little effect on the energy dissipation capacity of the frame.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU755
本文编号：2471109
[Abstract]:With the development of social economy, the application of super-long concrete structure in our country is more and more. However, due to the need of building function, there are few or no deformation joints in the structure. However, the super-long concrete structure can not be cast once, but by sections, and the post-pouring belt method has been well applied and developed at this time. At present, the engineering practical experience of the post-pouring belt method is far ahead of the theoretical research. The designers mostly refer to the existing engineering practical experience in the design, even refer to the existing engineering practice completely, without careful analysis and research. The structure not only can not achieve the purpose of controlling the crack, but also causes a large number of cracks, which brings many problems for the later use of the building. In this paper, on the basis of summarizing a large number of previous research results, the seismic behavior of frame structures with few post-cast-in-place belts is studied experimentally. The main work is as follows: firstly, the working principle of the post-pouring belt in the super-long concrete structure is introduced, and the research status of the post-pouring belt of the super-long concrete structure at home and abroad is summarized and analyzed systematically. Referring to the previous research results, this paper discusses four aspects: the steel bar that passes through the post-pouring belt, the setting form of the post-pouring belt, the treatment mode of the post-cast-in-place belt and the form of the building structure. This paper summarizes and analyzes in detail the factors that affect the effective role of the post-pouring belt in the super-long concrete structure, which provides a theoretical basis for the comprehensive understanding and application of the post-cast-in-place belt. Based on the quasi-static tests of five post-cast-in-place frames and whole-cast frames, the effects of longitudinal reinforcement at the post-cast-in-place, the overlap of the top longitudinal reinforcement and the addition of longitudinal additional reinforcement on the seismic behavior of the frame and the failure pattern of the frame are studied. The hysteretic curve, skeleton curve, deformation capacity, stiffness degradation, energy dissipation capacity, deformation recovery ability and so on are compared and analyzed. The experimental results show that the new and old concrete joints of the post-cast-in-place belt are easy to form through cracks, and the cracks can be effectively avoided through the whole section by adding longitudinal reinforcement to the ventral of the beam. The addition of longitudinal reinforcement at the post-cast-in-place has the most significant effect on the seismic behavior of the frame, and plays a positive role in the energy dissipation and deformation capacity of the frame, but it accelerates the stiffness degradation of the frame and increases the residual deformation of the frame. The lapping of steel bars at the post-cast-in-place has slightly improved the energy dissipation capacity of the frame, accelerated the degradation of the frame stiffness and increased the residual deformation of the frame, but has little effect on the other seismic behavior of the frame. The reinforcement penetration at the post-cast-in-place has a certain adverse effect on the stiffness degradation and residual deformation of the frame, and has a certain effect on the ductility of the frame, but has little effect on the energy dissipation capacity of the frame.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU755
【引证文献】
相关期刊论文 前3条
1 刘文奇;;针对混凝土后浇带应用分析及优化探究[J];门窗;2015年04期
2 王静梅;刘文秀;;超长混凝土结构取消沉降后浇带技术的研究与应用[J];施工技术;2015年03期
3 吕应臣;邵景干;;后浇带桥面铺装钢纤维混凝土配合比设计与试验研究[J];公路交通科技(应用技术版);2014年08期
相关硕士学位论文 前5条
1 申燕;基于跳仓法的超长混凝土结构施工质量控制研究[D];苏州科技大学;2017年
2 夏玲;大体积混凝土施工的裂缝控制研究[D];湖北工业大学;2017年
3 娄虹玉;某博览中心框架结构超长设计研究[D];贵州大学;2016年
4 赖航;超长超大面积混凝土底板裂缝控制研究与应用[D];重庆大学;2015年
5 赵云波;无缝连续浇筑大体积混凝土温度控制及应变分析[D];西安建筑科技大学;2015年
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