钢管再生砖骨料混凝土柱试验研究

发布时间：2018-06-21 03:37

本文选题：再生砖骨料混凝土 + 轴心受压　；参考：《辽宁工业大学》2017年硕士论文

【摘要】：为了使建筑垃圾资源化,可以将其回收再利用制作成满足土木工程要求的构件。在建筑垃圾的再利用研究中,有关再生混凝土的研究已比较系统,而对再生砖骨料混凝土的研究甚少,处于对再生砖骨料混凝土力学性能的研究阶段,对其工程应用涉入较少。本文对再生砖骨料混凝土基本力学性能进行了研究并将再生砖骨料混凝土用于钢管混凝土组合柱中,通过试验研究和计算分析等方法探讨了钢管再生砖骨料混凝土柱应用的可行性。本文主要内容及主要结论如下:(1)利用再生砖骨料和混杂再生砖骨料配制C20混凝土,按照规范进行配合比设计、试配并测试其力学性能,找出最优配合比,最优配合比为水泥:砂:混杂再生砖骨料(再生砖骨料):水:减水剂=1:2.705:2.865:0.45:0.007。同样的配合比,混杂再生砖骨料混凝土强度比再生砖骨料混凝土强度提高了14.1%。(2)完成了不同壁厚的钢管再生砖骨料混凝土和钢管混杂再生砖骨料混凝土短柱的轴压试验研究,记录并分析了试件的荷载-位移曲线、荷载-应变曲线,结果表明:(1)钢管混杂再生砖骨料混凝土短柱的极限承载力高于钢管再生砖骨料混凝土短柱,当管壁厚度由1.8mm变为4mm时,截面含钢率提高了2.62%,钢管混杂再生砖骨料混凝土短柱和钢管再生砖骨料混凝土短柱的极限承载力分别提高了44.2%和40.5%。管壁厚度为1.8mm和4mm时,钢管混杂再生砖骨料混凝土柱承载力比钢管再生砖骨料混凝土柱分别提高了16.8%和19.8%。(2)利用国内外9个相关规范计算、比较了钢管再生砖骨料混凝土轴压短柱承载力,其中规范DL/T 5085-1999计算得到的结果和试验值最为接近,安全性最低。(3)完成了不同壁厚、长细比的钢管再生砖骨料混凝土和钢管混杂再生砖骨料混凝土中长柱、长柱的偏压试验研究,记录并分析了试件的荷载-位移曲线、荷载-应变曲线与荷载-侧向挠度曲线,结果表明:(1)钢管再生砖骨料混凝土试件的偏压承载力低于钢管混杂再生砖骨料混凝土试件,就中长柱而言,通过试件承载力的比较发现,管壁厚度为1.8mm和4mm时,再生砖骨料混凝土试件的承载力比混杂再生砖骨料混凝土试件的承载力分别下降了25.7%和18.2%;(2)利用国内外相关规范计算、比较了钢管再生砖骨料混凝土偏压中长柱、长柱承载力,其中规范CECS 28:90的计算结果和实测值最接近,安全性最低;(3)随着长细比的增加,钢管再生砖骨料混凝土柱挠度变大,承载力下降,当长径比由5变为10时,以钢管再生砖骨料混凝土柱为例,管壁厚度为1.8mm和4mm时,钢管再生砖骨料混凝土柱的侧向挠度分别增加了约9mm和13mm,承载力分别下降了17.6%和11.2%。
[Abstract]:In order to reuse construction waste, it can be recycled to meet the requirements of civil engineering. In the research of reuse of construction waste, the research on recycled concrete has been systematical, but the research on recycled brick aggregate concrete is very few, so it is in the stage of studying the mechanical properties of recycled brick aggregate concrete, and its engineering application is less. In this paper, the basic mechanical properties of recycled brick aggregate concrete are studied, and the recycled brick aggregate concrete is used in concrete filled steel tube composite columns. The feasibility of application of steel tube recycled brick aggregate concrete column is discussed by means of experimental study and calculation and analysis. The main contents and conclusions of this paper are as follows: (1) using recycled brick aggregate and hybrid recycled brick aggregate to prepare C20 concrete, according to the specifications, the mix ratio is designed, and its mechanical properties are tested and the optimum mix ratio is found out. The optimum mix ratio is cement: sand: mixed recycled brick aggregate (recycled brick aggregate: water: water reducer 1: 2.705: 2.865: 0.45: 0.007). With the same mix ratio, the strength of mixed recycled brick aggregate concrete is increased by 14.1than that of recycled brick aggregate concrete.) the axial compression test of steel tube recycled brick aggregate concrete and steel tube hybrid recycled brick aggregate concrete short column with different wall thickness has been completed. The load-displacement curve and load-strain curve of the specimen are recorded and analyzed. The results show that the ultimate bearing capacity of the short column of steel tube hybrid recycled brick aggregate concrete is higher than that of the steel tube recycled brick concrete short column, and when the thickness of the pipe wall changes from 1.8mm to 4mm, The steel content of the section is increased by 2.62%, the ultimate bearing capacity of the short column of recycled brick aggregate concrete and the short column of recycled brick concrete filled with steel tube are increased by 44.2% and 40.5%, respectively, and the ultimate bearing capacity of the short column is increased by 44.2% and 40.5%, respectively. When the thickness of the pipe wall is 1.8mm and 4mm, the bearing capacity of the concrete column with mixed recycled brick concrete is 16.8% higher than that of the column with recycled brick concrete of steel tube and 19.82.The bearing capacity of the column is calculated by using nine relevant codes at home and abroad. The bearing capacity of steel tube recycled brick aggregate concrete short columns under axial compression is compared. The calculated results obtained by the code DL / T5085-1999 are the closest to the experimental values, and the safety is the lowest. In this paper, the deflections of long columns and columns of steel tube recycled brick aggregate concrete and steel tube mixed recycled brick aggregate concrete with slenderness ratio are studied. The load-displacement curves, load-strain curves and load-lateral deflection curves of the specimens are recorded and analyzed. The results show that the bearing capacity of steel tube recycled brick aggregate concrete specimen is lower than that of steel tube mixed recycled brick aggregate concrete specimen. For medium and long columns, it is found that when the thickness of tube wall is 1.8mm and 4mm, The bearing capacity of recycled brick aggregate concrete specimens is reduced by 25.7% and 18.2% respectively compared with that of hybrid recycled brick aggregate concrete specimens. The calculated result of CECS 28:90 is the closest to the measured value, and the safety is the lowest. With the increase of slenderness ratio, the deflection of concrete column of recycled brick concrete filled steel tube becomes larger, and the bearing capacity decreases. When the aspect ratio changes from 5 to 10:00, Taking recycled steel tubular brick aggregate concrete column as an example, when the thickness of pipe wall is 1.8mm and 4mm, the lateral deflection of steel tube recycled brick aggregate concrete column increases by about 9mm and 13mm respectively, and the bearing capacity decreases by 17.6% and 11.2% respectively.
【学位授予单位】：辽宁工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU528

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