高强钢筋高强混凝土短柱抗震性能研究

发布时间：2018-03-21 05:28

本文选题：高强钢筋　切入点：高强混凝土　出处：《沈阳建筑大学》2015年硕士论文　论文类型：学位论文

【摘要】：近年来,高强钢筋和高强度混凝土已经在结构工程中得到应用。高强钢筋的强度较普通钢筋有很大的提高,但其没有明显的屈服点。高强混凝土较普通混凝土的强度同样得到很大的提升,但是随着混凝土强度的提高,混凝土的脆性越来越明显,这对结构是不利的。针对高强钢筋高强混凝土柱在强震作用下的抗震性能,国内外很多学者做了大量的相关研究,并取得了一定的成果。但针对高强钢筋高强混凝土短柱的研究尚有不足,尤其是在地震荷载作用下时,配置高强钢筋的高强混凝土短柱的抗震性能及破坏机理与普通混凝土短柱有一定的区别。本文在理论分析的基础上,进行了相关的试验研究,着重研究了配置高强钢筋的高强混凝土短柱在往复荷载作用下的破坏特点及抗震性能。具体工作包括以下几个方面：(1)综述了近年来国内外在普通混凝土短柱和高强混凝土短柱在地震荷载作用下的抗震性能的研究概况。(2)完成了八根配有1420级预应力钢棒(简称PC钢棒)作为混凝土短柱的纵筋和箍筋的高强混凝土短柱在低周往复荷载作用下的抗震性能试验研究。通过拟静力试验方法研究配置高强钢筋的高强混凝土短柱的滞回特性及影响其抗震性能的相关因素。分析了各参数包括混凝土强度、箍筋强度、箍筋间距和轴压比等因素对高强混凝土短柱的延性和抗震性能的影响,讨论了试件的滞回曲线、骨架曲线、箍筋和纵筋的应力-应变曲线的特征,并对试验结果进行了分析和比较。试验结果表明：在地震荷载作用下的,配置高强钢筋的高强混凝土短柱发生弯曲破坏。(3)结合中国现行的《混凝土结构设计规范》(GB 50010-2010)及相关文献中柱子的正截面承载力计算方法,并结合试验结果,建议对配置高强钢筋的高强混凝土短柱的正截面承载力方法进行改善。(4)对配置高强钢筋的高强混凝土短柱抗震性能的进一步研究给出了建议,为以后更深入的研究打下基础。
[Abstract]:In recent years, high strength steel bars and high strength concrete have been used in structural engineering. But it has no obvious yield point. The strength of high strength concrete is also greatly improved compared with ordinary concrete, but with the increase of concrete strength, the brittleness of concrete becomes more and more obvious. In view of the seismic behavior of high-strength reinforced high-strength concrete columns under strong earthquake, many scholars at home and abroad have done a lot of relevant research. Some achievements have been made. However, the research on high strength reinforced high strength concrete short columns is still insufficient, especially under earthquake load. The seismic behavior and failure mechanism of high strength reinforced concrete short columns are different from that of ordinary concrete short columns. The failure characteristics and seismic behavior of high strength concrete short columns with high strength reinforcement under reciprocating load are studied emphatically. The concrete work includes the following aspects: 1) A summary of the short columns and high strength concrete columns at home and abroad in recent years is given. Research Survey of Seismic behavior of strong concrete short columns under earthquake load. (2) eight high strength concrete short columns with 1420 grade prestressed steel bars (PC bars) as longitudinal reinforcement and stirrups in low cycle have been completed. The hysteretic characteristics of high strength concrete short columns with high strength reinforcement and the relative factors affecting their seismic behavior are studied by pseudo static test method. The parameters including concrete strength are analyzed. The effects of stirrups strength, stirrups spacing and axial compression ratio on the ductility and seismic behavior of high strength concrete short columns are discussed. The hysteretic curves, skeleton curves, stress-strain curves of stirrups and longitudinal bars are discussed. The experimental results are analyzed and compared. The experimental results show that: under the action of earthquake load, High strength concrete short columns with high strength steel bars are subjected to flexural failure. 3) combined with the present Code for Design of concrete structures in China (GB50010-2010) and the calculation method of normal section bearing capacity of columns in related literature, and combined with the test results, It is suggested that the method of normal section bearing capacity of high strength concrete short columns with high strength steel bars be improved. 4) the further study on seismic behavior of high strength concrete short columns with high strength steel bars is suggested, which will lay a foundation for further research.
【学位授予单位】：沈阳建筑大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU375;TU352.11

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