废弃纤维再生混凝土梁柱节点滞回性能研究

发布时间：2018-08-09 14:45

【摘要】：现阶段我国正处于一个快速发展的阶段,建筑行业,纺织行业快速发展,城市更新的速度也加快了,这就造成了大量的建筑废料和纺织废料的产生,如今,这些废料的处理成了环境治理的大问题,而且建筑业的发展消耗了大量的自然资源,将废弃的混凝土和废弃的纤维重新利用,制成新的混凝土,既能节约原材料又能保护环境,对我国可持续发展有重大意义。本文通过改变试件的再生骨料掺量、废弃纤维体积掺量、废弃纤维长度这三个因素,对废弃纤维再生混凝土梁柱节点进行研究,一共设计了八个试件,采用低周反复荷载作用下进行试验分析,对试件的滞回曲线、骨架曲线、刚度退化和耗能性能进行研究,分析并对比在不同影响因素下的试件的最优掺量。得到以下结论:1.废弃纤维再生混凝土节点和普通混凝土的破坏过程基本一致,都可以分为弹性阶段、带裂缝工作阶段和极限到破坏阶段,从试件的破坏现象可以看出,试件的破坏主要集中在节点核心区,梁根没有发生很大的破坏,只产生一些细微裂缝。2.试件中加入废弃聚丙烯纤维对混凝土的抗震有利,各试件的滞回曲线和骨架曲线很相似。3.废弃纤维再生混凝土梁柱节点的滞回曲线很饱满,其中其他掺量不变的情况下,不掺再生骨料的试件优于其他两组,废弃纤维体积掺量为0.12%,废弃纤维长度为19mm的试件比其他对比的试件抗震性能要好。4.各试件的骨架曲线和普通混凝土的骨架曲线趋势基本一致,废弃纤维再生混凝土后期的承载力要高于普通混凝土。5.废弃纤维再生混凝土没有刚度突变,刚度退化曲线平缓,抗震性能较好。6.废弃纤维体积掺量0.12%,长度19mm,再生骨料掺量0或者50%的情况下的试件抗震性能各项指标均优于普通混凝土。
[Abstract]:At this stage, our country is in a stage of rapid development. The construction industry, the textile industry, the rapid development of the textile industry, and the speed of urban renewal have also accelerated, which has resulted in a large number of construction wastes and textile wastes. Now, The disposal of these wastes has become a major problem of environmental governance, and the development of the construction industry has consumed a large amount of natural resources. The reuse of waste concrete and abandoned fibers into new concrete can save raw materials and protect the environment. It is of great significance to the sustainable development of our country. In this paper, the Liang Zhu joints of recycled concrete are studied by changing the content of recycled aggregate, the volume of waste fiber and the length of waste fiber, and eight specimens are designed. The hysteretic curve, skeleton curve, stiffness degradation and energy dissipation performance of the specimen were studied under low cycle repeated load, and the optimum content of the specimen under different influence factors was analyzed and compared. Get the following conclusion: 1. The failure process of recycled fiber reinforced concrete joints is basically the same as that of ordinary concrete, which can be divided into elastic stage, working stage with crack and limit to failure stage. The failure phenomenon of the specimen can be seen. The damage of the specimen is mainly concentrated in the core area of the joint, and the beam root does not have much damage, but only produces some minor cracks. 2. Adding waste polypropylene fiber to the specimen is beneficial to the earthquake resistance of concrete. The hysteretic curve and skeleton curve of each specimen are very similar. 3. The hysteretic curves of waste fiber recycled concrete (Liang Zhu) joints are very full, and the specimen without recycled aggregate is better than the other two groups when other contents are constant. The volume content of waste fiber is 0.12 and the length of waste fiber is 19mm. The seismic performance of the specimen with 19mm is better than that of other contrasted specimens. 4. The skeleton curve of each specimen is basically the same as that of ordinary concrete, and the bearing capacity of recycled concrete is higher than that of ordinary concrete at the later stage. There is no stiffness abrupt change, stiffness degradation curve is smooth and seismic performance is better. 6. When the volume of waste fiber is 0.12, the length is 19mm, and the content of recycled aggregate is 0 or 50%, the seismic performance of the specimen is better than that of ordinary concrete.
【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】：TU37

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