钢管地聚物再生混凝土短柱轴压荷载下的实验研究

发布时间：2018-05-03 00:34

本文选题：地聚物混凝土 + 钢管短柱　；参考：《工程力学》2014年S1期

【摘要】：地聚物再生混凝土(Geopolymeric recycled concrete,GRC)是一种考虑环境可持续发展的新型建筑材料,它是利用粉煤灰激发的碱溶液完全代替水泥,同时利用再生粗骨料完全或部分代替天然粗骨料制作而成的新型混凝土材料。地聚物再生混凝土可以用在钢管结构中,称为钢管地聚物再生混凝土构件。该文对12根钢管地聚物再生混凝土短柱进行了一系列实验研究,实验设计主要考虑了2种不同钢管界面尺寸、不同混凝土类型(普通再生混凝土、地聚物再生混凝土)以及不同再生骨料取代率(0%、50%、100%)。通过实验研究考察了构件在轴压荷载作用下的荷载-应变关系,对比分析了各构件的极限承载力和失效机理,并且通过延性指标(DI)对比分析了各个钢管短柱在轴压荷载作用下的延性行为表现。结果表明,随着钢管核心混凝土中再生粗骨料的增多,钢管地聚物再生混凝土和钢管再生混凝土的极限承载力随之降低。再生粗骨料的含量对钢管地聚物再生混凝土短柱的力学行为表现影响更大。最后,依照各规程的理论计算方法对本实验结果进行了比较,进一步探讨了各规程对计算钢管再生混凝土和钢管地聚物再生混凝土柱承载力的适用性。
[Abstract]:Geopolymer recycled concrete (GRC) is a new type of building material which takes into account the sustainable development of the environment. It is a completely replacement of cement with alkali solution excited by fly ash. At the same time, the recycled coarse aggregate is used to replace the natural coarse aggregate completely or partially. Recycled concrete with geopolymer can be used in steel tube structure. In this paper, a series of experimental studies have been carried out on 12 short columns of recycled concrete filled with steel tube. The experimental design has mainly considered two kinds of steel tube interface sizes, different concrete types (ordinary recycled concrete, common recycled concrete, etc.) Aggregate recycled concrete) and different recycled aggregate replacement rate. In this paper, the load-strain relationship of members under axial loading is investigated through experimental study, and the ultimate bearing capacity and failure mechanism of each member are compared and analyzed. The ductility behavior of short steel tubular columns under axial compression is analyzed by means of ductility index (DIY). The results show that with the increase of recycled coarse aggregate in the core concrete filled steel tube, the ultimate bearing capacity of recycled concrete filled with steel tube and recycled concrete filled with steel tube decreases. The content of recycled coarse aggregate has more influence on the mechanical behavior of recycled concrete columns. Finally, the experimental results are compared according to the theoretical calculation methods of each regulation, and the applicability of the rules to the calculation of the bearing capacity of recycled concrete filled steel tubular columns and recycled concrete filled steel tubular columns is further discussed.
【作者单位】：四川大学建筑与环境学院;四川大学能源工程与灾害力学教育部重点实验室;
【基金】：国家自然科学基金项目(51208325) 四川大学青年教师科研启动基金项目(2012SCU11)
【分类号】：TU398.9

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