【作者】 张浩；

【导师】 张经双；

【作者基本信息】 安徽理工大学 ， 建筑与土木工程， 2018， 硕士

【摘要】 装配式混凝土结构具有施工速度快、环境污染小等优点,已成为建筑领域的研究热点之一。影响装配式混凝土结构质量的主要因素是连接节点的性能,因此,套筒灌浆连接是装配式结构构件的关键技术。在寒冷地区,冻融循环也影响到装配式混凝土结构的节点性能。论文主要进行了全灌浆套筒连接节点在常温和冻融循环下的拉伸性能试验研究,得到以下主要结论:(1)通过正交配比试验,得到胶砂比1.0,水胶比0.26,塑性膨胀剂掺量为0.03%,硅粉掺量为0.5%,减水剂掺量为0.5%,HCSA掺量为9%的灌浆料,其性能符合要求。(2)常温养护下试件表面的灌浆料没有出现明显的剥落,冻融循环作用使灌浆料内部的孔隙增多、试件端口出现少量灌浆料剥落。(3)与钢筋母材相比,常温养护下的全灌浆套筒极限抗拉强度得到提高,其锚固长度和灌浆料的性能满足要求。(4)与常温养护相比,冻融循环作用下的全灌浆套筒的屈服强度、极限强度及极限粘结强度均出现了下降,GT16L-4、GT16L-5、GT16L-6的极限粘结强度分别下降了0.99%、5%、4.26%,GT20L-4、GT20L-5、GT20L-6的极限粘结强度下降了6.49%、0.53%、0.53%。(5)试验研究了常温养护下和冻融循环作用下的套筒表面径向与轴向应变,得到套筒最薄弱的节点在套筒中部。(6)利用ANSYS进行有限元模拟,模拟出极限荷载下全灌浆套筒的破坏模式与全灌浆套筒上的应力应变分布图,对比发现分布规律基本一致。更多还原

【Abstract】 The fabricated concrete structure has many advantages,such as fast construction speed and little environmental pollution,has become one of the research focuses in the field of construction.It has become one of the research focuses in the field of architecture.The main factor affecting the quality of fabricated concrete structure is the performance of connection nodes.Therefore,sleeve grouting connection is the key technology of fabricated structural components.The paper mainly carried out the experiment research of tensile properties of full grouting sleeve joint under normal temperature and freeze-thaw cycle,the following main conclusions are obtained:(1)Through orthogonal test,the properties of rubber sand ratio 1,water glue ratio 0.26,plastic expansion agent content 0.03%,silica powder content 0.5%,water reducing agent dosage 0.5%,HCSA content 9% grouting material,its performance meet the requirements.(2)There is no obvious exfoliation on the grouting material on the surface of the specimen under normal temperature curing.The effect of freezing and thawing cycle makes the pores in the grouting material increase,and a small amount of grouting material is exfoliating on the port of the specimen.(3)Compared with the base material,the ultimate tensile strength of the whole grouting sleeve under normal temperature is improved,and the anchorage length and the performance of grouting material meet the requirements.(4)Compared with the normal temperature curing,the yield strength,ultimate strength and ultimate bond strength of all grouting sleeves under the effect of freeze-thaw cycle decreased.The ultimate bond strength of GT16L-4,GT16L-5 and GT16L-6 decreased by 0.99%,5%,4.26% respectively,and the ultimate bond strength of GT20L-4,GT20L-5 and GT20L-6 decreased by 6.49%,0.53%,0.53%.(5)The radial and axial strain of the sleeve under normal temperature curing and freeze-thaw cycles is experimentally studied,and the weakest node of the sleeve is obtained in the middle of the sleeve.(6)The finite element simulation was carried out by ANSYS to simulate the failure mode of the full grouting sleeve under the limit load and the distribution of stress and strain on the full grouting sleeve,and the distribution law was found to be the same as that of the whole grouting sleeve.更多还原