套筒类型和内表面形状对钢筋连接性能的影响

发布时间：2018-05-15 22:21

本文选题：钢筋套筒灌浆连接构件 + 装配式建筑　；参考：《沈阳建筑大学》2014年硕士论文

【摘要】：近年来,科学技术的发展和不断创新,极大地推动了建筑业的迅猛发展,在施工现场进行房屋组装,彻底改变了传统落后的房屋施工做法。随着建筑工业化的发展,各国把建筑部件工厂预制化和施工装配化,作为住宅产业现代化的重要标致。装配式建筑的发展将促进建筑领域生产方式的巨大变革。降低能耗、保护生态与环境,使用新材料、应用新工艺,提高工程质量、提高工效,减少污染和浪费、减少现场作业,实现文明施工是当前技术进步的重要标志。加强关键技术创新和系统体系集成,实现房屋建筑的产业化、多样化、工业化,将是新世纪建筑业的发展趋势。在装配式建筑中,预制件之间的连接主要是通过套筒灌浆将钢筋连接起来,形成整体,共同抵抗外界的各种不利荷载。由于预制梁和预制柱是在工厂生产的,质量容易保证：相比之下,各构件的连接处显得有些薄弱,会产生“强柱强梁弱节点”的不利结构。节点破坏是装配式建筑在地震中破坏主要形式之一。可见在装配式建筑中,钢筋套筒灌浆连接起着决定性的作用。本课题在国家科学自然基金项目(No.51278312)的大力支持下,采用ABAQUS有限元软件对钢筋套筒灌浆连接的静力响应进行了详细的有限元数值模拟研究。主要研究内容包括：(1)从混凝土大直径受力钢筋的连接角度,总结了受力钢筋的几种连接方法以及连接方式优缺点。(2)根据钢筋套筒灌浆连接的实际构造,对钢筋套筒灌浆连接建立在轴向静力荷载作用下的数值模型。研究结果表明：在钢筋和套筒之间荷载传递的主要方式是通过灌浆料形成的“灯伞状”的环形受压斜柱进行荷载传递。(3)在上述钢筋套筒灌浆连接有限元模型的基础上,通过改变灌浆料与套筒之间的摩擦系数(套筒内表面的粗糙程度)研究其对套筒连接钢筋构件力学性能的影响。研究表明：套筒与灌浆料之间的摩擦系数对套筒连接钢筋构件力学性能和约束能力几乎没有影响。(4)通过改变套筒肋间距这一参数,研究结果表明：当套筒内肋间距在28mm～14mm范围内时,灌浆料能够有效地在钢筋与套筒之间传递荷载。当套筒内肋间距过大时,灌浆料受力不均匀,局部区域灌浆料的最大第三主应力远远超出灌浆料抗压强度；当套筒内肋间距过小时,灌浆料通过剪切力的作用在钢筋与套筒之间传递荷载,灌浆料易发生剪切破坏,甚至将钢筋从套筒内拔出。(5)建立套筒肋间距为14mmm的钢筋套筒灌浆连接数值模型,研究灌浆料轴向抗压强度这一因素对钢筋套筒灌浆连接性能的影响。研究结果表明：随着灌浆料轴心抗压强的增加,灌浆料对钢筋的约束程度逐渐增大,钢筋位移和灌浆料最大第三主应力也逐渐减小。
[Abstract]:In recent years, with the development and innovation of science and technology, the rapid development of the construction industry has been greatly promoted, housing assembly has been carried out on the construction site, and the traditional backward building construction practices have been completely changed. With the development of construction industrialization, the prefabrication and construction assembly of building parts factory are regarded as the important Peugeot in the modernization of housing industry. The development of prefabricated architecture will promote the great transformation of production mode in the field of architecture. Reducing energy consumption, protecting ecology and environment, using new materials, applying new technology, improving engineering quality, improving work efficiency, reducing pollution and waste, reducing field operation and realizing civilized construction are important signs of current technological progress. Strengthening the innovation of key technology and the integration of system, realizing the industrialization, diversification and industrialization of housing construction will be the development trend of the construction industry in the new century. In the assembly building, the connection between prefabricated parts is mainly connected by sleeve grouting to form a whole and resist all kinds of unfavorable loads. Because prefabricated beams and prefabricated columns are produced in the factory, the quality is easy to guarantee: by contrast, the joints of each component are weak, which will produce the disadvantage of "strong columns, strong beams and weak joints". Node failure is one of the main failure forms of prefabricated buildings in earthquake. It can be seen that the reinforced sleeve grouting connection plays a decisive role in the assembly building. With the support of National Science and Nature Fund Project No. 51278312, the static response of reinforced sleeve grouting connection is studied by using ABAQUS finite element software in detail. The main research contents include: (1) from the angle of connection of concrete reinforced bar with large diameter stress, the paper summarizes several connection methods and advantages and disadvantages of connection method) according to the actual construction of reinforced sleeve grouting connection, The numerical model of reinforced sleeve grouting connection under axial static load is established. The results show that the main way of load transfer between steel bar and sleeve is to transfer the load through "lamp umbrella-shaped" circular oblique column formed by grouting material) on the basis of the above finite element model of reinforcement sleeve grouting connection. By changing the friction coefficient between the grouting material and the sleeve (the roughness of the inner surface of the sleeve), the effect of the friction coefficient on the mechanical properties of the steel members connected with the sleeve is studied. The results show that the friction coefficient between the sleeve and the grouting material has little effect on the mechanical properties and restraint ability of the steel members connected with the sleeve. The results show that when the inner rib spacing of the sleeve is within the range of 28mm~14mm, the grouting material can effectively transfer the load between the steel bar and the sleeve. When the inner rib spacing of the sleeve is too large, the grouting material is subjected to uneven force, the maximum third principal stress of the grouting material in the local area is far more than the compressive strength of the grouting material, and when the inner rib spacing of the sleeve is too small, The grouting material transfers the load between the steel bar and the sleeve through the shear force, and the grouting material is prone to shear failure. Even the steel bar is pulled out from the sleeve. (5) the numerical model of the grouting connection of the steel bar sleeve with 14mmm spacing is established. The influence of axial compressive strength of grouting material on the connection performance of reinforced sleeve grouting was studied. The results show that with the increase of the axial compressive strength of the grouting material, the restraint degree of the grouting material increases gradually, and the displacement of the steel bar and the maximum third principal stress of the grouting material decrease gradually.
【学位授予单位】：沈阳建筑大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU756

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