【摘要】：為滿足既有鋼筋混凝土建筑的安全和使用功能要求,混凝土結(jié)構(gòu)加固技術(shù)得到了廣泛的關(guān)注。鋼筋混凝土構(gòu)件外貼纖維復(fù)合材料加固方法以其施工方便、安全耐用、加固效果好等優(yōu)點(diǎn)在實(shí)際的加固工程中得到了廣泛應(yīng)用。但加固后鋼筋混凝土梁的二次受力、纖維-混凝土粘結(jié)滑移、極限狀態(tài)受力性能等問題成為人們?nèi)找骊P(guān)注并致力研究的焦點(diǎn)。本文采用理論分析和數(shù)值模擬手段對外貼纖維加固的鋼筋混凝土梁的極限承載力進(jìn)行了分析,并基于纖維-混凝土粘結(jié)滑移關(guān)系對纖維層數(shù)、配筋率的影響進(jìn)行探討,主要內(nèi)容如下:1.匯總了外貼纖維加固鋼筋混凝土梁滯后應(yīng)變的計(jì)算方法。對比分析了各國規(guī)范在考慮二次受力情況下加固混凝土梁的計(jì)算公式,并給出了滯后應(yīng)變的簡便計(jì)算程序。2.考慮二次受力對外貼纖維加固鋼筋混凝土梁承載力的影響,對其受力全過程進(jìn)行了數(shù)值分析,結(jié)果表明:初始彎矩的存在降低了加固梁的屈服承載力和極限承載力,數(shù)值計(jì)算結(jié)果與文獻(xiàn)實(shí)驗(yàn)結(jié)果吻合較好。3.基于芳綸纖維-混凝土粘結(jié)滑移關(guān)系,考慮粘結(jié)層數(shù),配筋率影響因素,對外貼芳綸纖維加固鋼筋混凝土梁的受力性能進(jìn)行數(shù)值計(jì)算,給出外貼纖維的最優(yōu)粘結(jié)層數(shù);加固梁的承載力隨著粘結(jié)層數(shù)的增加而增加,但不是線性增加;在粘結(jié)層數(shù)相同的情況下,混凝土梁的配筋率較低時(shí),纖維布能更好的的發(fā)揮作用,使加固梁的承載力大幅度提高。
[Abstract]:In order to meet the safety and functional requirements of existing reinforced concrete buildings, the reinforcement technology of concrete structures has received extensive attention. The reinforcement method of reinforced concrete members is widely used in practical engineering because of its advantages such as convenient construction, safety and durability, good reinforcement effect and so on. However, the problems such as the secondary force of reinforced concrete beam, the bond slip between fiber and concrete, and the ultimate behavior of the reinforced concrete beam have become the focus of attention and research. In this paper, theoretical analysis and numerical simulation are used to analyze the ultimate bearing capacity of reinforced concrete beams strengthened with externally bonded fibers, and based on the relationship between fiber and concrete bond-slip, the influence of fiber layer number and reinforcement ratio is discussed. The main content is as follows: 1. The calculation method of lag strain of reinforced concrete beams strengthened with external fiber is summarized. This paper compares and analyzes the calculation formulas of concrete beams strengthened by national codes under the condition of considering the secondary force, and gives a simple calculation program of hysteresis strain. Considering the influence of secondary force on the bearing capacity of reinforced concrete beams strengthened with external affixed fibers, the whole process of the reinforced concrete beams is numerically analyzed. The results show that the existence of initial bending moment reduces the yield bearing capacity and ultimate bearing capacity of strengthened beams. The numerical results are in good agreement with the experimental results. Based on the bond slip relationship between aramid fiber and concrete, considering the influence factors of bond layer number and reinforcement ratio, the mechanical properties of reinforced concrete beams strengthened with aramid fiber are calculated numerically, and the optimal number of bonding layers is given. The bearing capacity of the strengthened beam increases with the increase of the number of bonding layers, but not linearly. When the reinforcement ratio of the concrete beam is low, the fiber cloth can play a better role when the number of bonding layers is the same. The bearing capacity of the strengthened beam is greatly increased.
【學(xué)位授予單位】：哈爾濱工程大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU375.1

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