本文選題：輸電鐵塔 + 基礎(chǔ)主柱�。� 參考：《中國礦業(yè)大學(xué)》2017年碩士論文

【摘要】：舊有高壓輸電線路(如運行25年以上)的部分鐵塔混凝土基礎(chǔ)主柱因長期受自然環(huán)境的侵蝕而產(chǎn)生老化損傷,使得其承載性能和耐久性能大幅降低。針對不同損傷程度的鐵塔基礎(chǔ)主柱,本文提出建議采用修復(fù)劑修復(fù)和增大截面加固兩種修復(fù)方法,并對兩種修復(fù)方法的修復(fù)效果進行了試驗研究。對徐州地區(qū)運行的500kV典型輸電線路鐵塔混凝土基礎(chǔ)主柱進行檢測,分析了鐵塔基礎(chǔ)主柱的損傷原因及機理。對不同齡期的混凝土試塊涂抹修復(fù)劑后的抗壓強度和碳化深度進行了試驗研究,分析了齡期、混凝土強度等因素對混凝土抗壓強度修復(fù)效果及混凝土抗碳化性能影響作用的影響規(guī)律。結(jié)果表明,修復(fù)劑對混凝土抗壓強度的修復(fù)效果隨著齡期的增長呈現(xiàn)出先增強后減弱的規(guī)律,齡期28d時,修復(fù)效果最佳;修復(fù)劑對混凝土抗碳化性能的影響作用隨著齡期的增長基本呈現(xiàn)出逐漸減弱的規(guī)律。對涂抹修復(fù)劑后的低強混凝土短柱試件極限承載力進行了試驗研究,分析了修復(fù)劑用量、混凝土強度等因素對短柱試件承載性能修復(fù)效果的影響規(guī)律。結(jié)果表明,修復(fù)劑對低強混凝土短柱試件承載性能的修復(fù)效果隨著修復(fù)劑用量的增加而不斷增強。對短柱試件增大截面加固后的軸心受壓及雙向偏心受壓極限承載力進行了試驗研究,分析了加固厚度、加固材料強度、雙向偏心偏心距等因素對試件加固后軸心受壓及雙向偏心受壓承載性能的影響規(guī)律。結(jié)果表明,加固厚度增加可大幅提高試件加固后軸心受壓承載性能;加固材料強度增大可提高試件加固后軸心受壓承載性能,但加固材料強度與原試件強度相差較大時,試件加固后軸心受壓承載性能提高效果不增反減;試件加固后雙向偏心受壓承載性能隨偏心距的增大而降低。提出了增大截面加固后的試件雙向偏心受壓極限承載力的計算公式,并結(jié)合試驗結(jié)果對公式的正確性進行了分析。結(jié)果表明:本文提出的公式基本可用,可為加固方案設(shè)計及工程應(yīng)用提供參考。
[Abstract]:The aging damage caused by the erosion of the old high voltage transmission lines (such as more than 25 years operation) of the main column of the concrete foundation of the iron tower caused by the erosion of the natural environment for a long time, the bearing capacity and durability of the tower can be greatly reduced.Aiming at the main column of tower foundation with different damage degree, this paper puts forward two kinds of restoration methods, that is, repairing agent and strengthening with enlarged section, and carries on the experimental research on the restoration effect of two kinds of repair methods.The main column of concrete foundation of typical 500kV transmission line in Xuzhou area is tested, and the damage cause and mechanism of main column of tower foundation are analyzed.The compressive strength and carbonation depth of concrete samples of different ages after smearing the repair agent were studied, and the age of concrete was analyzed.The influence of concrete strength and other factors on the effect of compressive strength repair and carbonation resistance of concrete.The results show that the repair effect of the repairable agent on the compressive strength of concrete increases firstly and then weakens with the increase of age, and the best effect is at the age of 28 days.The effect of the repair agent on the carbonation resistance of concrete is gradually weakened with the increase of age.The ultimate bearing capacity of low strength concrete short column specimens coated with repairable agent is studied experimentally. The influence of the amount of repair agent and the strength of concrete on the repair effect of short column specimens is analyzed.The results show that the effect of the repairable agent on the load-bearing performance of the low strength concrete short column specimens is enhanced with the increase of the amount of the repairable agent.The ultimate bearing capacity of axial compression and biaxial eccentricity compression of short column specimens strengthened with increased cross-section is studied experimentally. The strengthening thickness and strength of strengthening materials are analyzed.The influence of biaxial eccentricity and other factors on axial compression and biaxial eccentric bearing capacity of specimens strengthened.The results show that the axial compression bearing capacity of the specimens can be greatly improved with the increase of the strengthening thickness, and the axial compression bearing capacity of the specimens can be improved with the increase of the strength of the strengthening materials, but when the strength of the strengthening materials is different from the strength of the original specimens,After strengthening, the bearing capacity of axial center is not increased but decreased, and the biaxial eccentric bearing capacity decreases with the increase of eccentricity.A formula for calculating the ultimate bearing capacity of biaxial eccentric compression of reinforced specimens with increased cross-section is proposed, and the correctness of the formula is analyzed in combination with the experimental results.The results show that the formula presented in this paper can be used as a reference for the design of reinforcement scheme and engineering application.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU755.7

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本文編號：1762432