FRP筋-ECC-混凝土复合结构力学性能研究
发布时间：2018-12-18 21:42
【摘要】：纤维聚合筋(FRP)筋轻质、高强、耐腐蚀,可以解决钢筋混凝土结构的锈蚀问题。高韧性水泥基复合材料(ECC)材料在纤维体积掺量约2.0%的情况下,其极限抗拉应变达到2%以上,具有明显的应变-硬化特性,且对裂缝有着很好的控制能力。当两种材料复合且协同工作时,可以优势互补,形成了具有很好抗拉性能和裂缝控制能力的复合结构。为了探明FRP筋-ECC-混凝土复合结构的力学性能,本文开展有限元分析,研究ECC-FRP筋的粘结锚固性能以及FRP筋-ECC混凝土复合梁的力学性能；开展试验研究,探索FRP筋-ECC加固钢筋混凝土柱在偏心荷载作用下的力学行为。具体包括以下几个方面： (1)通过对不同滑移本构关系与试验数据的对比分析,探讨适用于FRP筋-ECC的粘结滑移本构模型。 (2)采用非线性弹簧模拟FRP筋与ECC之间的粘结性能,建立了BFRP筋-ECC拔出试验的有限元模型,并通过有限元软件分析比较了FRP筋-ECC和FRP筋-混凝土的粘结滑移曲线；根据连续曲线模型推导了FRP筋锚固长度的计算公式。 (3)建立了FRP筋-ECC-混凝土复合梁的三维模型,通过有限元与试验数据对比证明该模型的有效性,并在此基础上,进行了一系列的敏感性分析,探究了不同ECC厚度、BFRP筋配筋率以及混凝土强度对复合梁力学性能的影响。 (4)利用FRP筋-ECC复合结构加固钢筋混凝土(RC)柱,试验研究了该加固方式对偏心受压柱的加固效果；利用有限元方法分析了加固柱在偏心荷载作用下的力学响应全过程。
[Abstract]:Fiber reinforced (FRP) bars are lightweight, high strength and corrosion resistant, which can solve the corrosion problem of reinforced concrete structures. The ultimate tensile strain of high toughness cement-based composite (ECC) is above 2% under the condition of about 2.0% fiber volume content, which has obvious strain-hardening property and good control ability to crack. When the two materials are combined and work together, they can complement each other and form a composite structure with good tensile performance and crack control ability. In order to find out the mechanical properties of FRP tendon-ECC- concrete composite structure, finite element analysis is carried out to study the bond anchoring performance of ECC-FRP bar and the mechanical property of FRP tendon-ECC concrete composite beam. To investigate the mechanical behavior of reinforced concrete columns strengthened with FRP tendons and ECC under eccentric loads. The main contents are as follows: (1) the bond-slip constitutive model suitable for FRP tendon-ECC is discussed by comparing and analyzing the different slip constitutive relations and experimental data. (2) using nonlinear spring to simulate the bond behavior between FRP bars and ECC, the finite element model of BFRP tendon-ECC pull-out test is established, and the bond-slip curves of FRP tendon-ECC and FRP tendon-concrete are analyzed and compared by finite element software. Based on the continuous curve model, the formula for calculating the anchoring length of FRP bars is derived. (3) the three-dimensional model of FRP tendon-ECC- concrete composite beam is established. The validity of the model is proved by comparing the finite element method with the experimental data. On the basis of this, a series of sensitivity analysis is carried out, and the different ECC thickness is explored. The effect of BFRP reinforcement ratio and concrete strength on the mechanical properties of composite beams. (4) the reinforced concrete (RC) columns are strengthened with FRP tendon-ECC composite structure, and the effect of the reinforcement on eccentric columns is studied experimentally, and the whole process of mechanical response of reinforced columns under eccentric load is analyzed by finite element method.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU377.9
[Abstract]:Fiber reinforced (FRP) bars are lightweight, high strength and corrosion resistant, which can solve the corrosion problem of reinforced concrete structures. The ultimate tensile strain of high toughness cement-based composite (ECC) is above 2% under the condition of about 2.0% fiber volume content, which has obvious strain-hardening property and good control ability to crack. When the two materials are combined and work together, they can complement each other and form a composite structure with good tensile performance and crack control ability. In order to find out the mechanical properties of FRP tendon-ECC- concrete composite structure, finite element analysis is carried out to study the bond anchoring performance of ECC-FRP bar and the mechanical property of FRP tendon-ECC concrete composite beam. To investigate the mechanical behavior of reinforced concrete columns strengthened with FRP tendons and ECC under eccentric loads. The main contents are as follows: (1) the bond-slip constitutive model suitable for FRP tendon-ECC is discussed by comparing and analyzing the different slip constitutive relations and experimental data. (2) using nonlinear spring to simulate the bond behavior between FRP bars and ECC, the finite element model of BFRP tendon-ECC pull-out test is established, and the bond-slip curves of FRP tendon-ECC and FRP tendon-concrete are analyzed and compared by finite element software. Based on the continuous curve model, the formula for calculating the anchoring length of FRP bars is derived. (3) the three-dimensional model of FRP tendon-ECC- concrete composite beam is established. The validity of the model is proved by comparing the finite element method with the experimental data. On the basis of this, a series of sensitivity analysis is carried out, and the different ECC thickness is explored. The effect of BFRP reinforcement ratio and concrete strength on the mechanical properties of composite beams. (4) the reinforced concrete (RC) columns are strengthened with FRP tendon-ECC composite structure, and the effect of the reinforcement on eccentric columns is studied experimentally, and the whole process of mechanical response of reinforced columns under eccentric load is analyzed by finite element method.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU377.9
【参考文献】
相关期刊论文 前10条
1 郭磊磊;张玉娥;邱晓光;;PVA-ECC材料性能研究及应用[J];河南城建学院学报;2010年01期
2 高淑玲;徐世p，
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