本文選題：纖維編織網(wǎng)增強混凝土(TRC) + 氯鹽干濕循環(huán)��； 參考：《中國礦業(yè)大學》2017年碩士論文

【摘要】：纖維編織網(wǎng)增強混凝土(Textile Reinforced Concrete,簡稱TRC)是一種由纖維編織網(wǎng)和高性能混凝土結(jié)合而成的新型復合材料。TRC加固不僅有FRP加固的一些優(yōu)點,而且還具有如下優(yōu)勢:其一,采用的高性能混凝土能提高加固層與混凝土基底之間的協(xié)調(diào)性,同時可抵抗火災(zāi)等高溫環(huán)境的危害;其次,高性能混凝土的密實性、抗離析性、高流動性等,能較好地修復受損結(jié)構(gòu)表面的裂縫,且能給構(gòu)件中的鋼筋再添一層抗腐蝕保護層。本文基于中國礦業(yè)大學學科前沿科學研究專項資助項目“海洋干濕環(huán)境下持載作用的TRC加固RC偏壓柱退化機理研究”,進行了氯鹽干濕循環(huán)環(huán)境下TRC加固鋼筋混凝土(RC)小偏心柱受壓性能的試驗研究,具體研究如下:(1)在研究TRC加固小偏心RC柱的受壓性能中,考慮了纖維編織網(wǎng)層數(shù)、長細比、配筋率、PVA短切纖維摻量、氯鹽干濕循環(huán)次數(shù)、荷載與氯鹽環(huán)境耦合作用等因素對加固柱受壓性能的影響。結(jié)果表明:在氯鹽干濕環(huán)境中,TRC對小偏心柱的加固效果較好;隨著TRC加固層數(shù)增加,其加固效果提高,但加固層增加到4層時,加固效果增加變緩;長細比的降低有助于加固柱承載力的改善;配筋率以及PVA短切纖維量一定程度的增加,均有助于提高TRC的加固效果;隨著氯鹽干濕次數(shù)循環(huán)次數(shù)增多,TRC的加固效果有降低的趨勢;荷載與氯鹽環(huán)境耦合作用對TRC加固柱受壓性能的損傷較明顯,隨著持續(xù)荷載的增加,損傷進一步加大。(2)對于TRC加固小偏心銹蝕RC柱的受壓性能研究中,考慮了不同纖維編織網(wǎng)層數(shù)的影響以及與未銹蝕加固柱的對比情況。結(jié)果表明:相比未銹蝕柱,通電銹蝕柱的脆性特征更強,采用TRC加固具有較好的效果,為加固柱提供了良好的抗氯鹽侵蝕能力和約束效果;銹蝕柱經(jīng)加固一層TRC后,承載力有明顯的提高,但加固層數(shù)繼續(xù)增加,承載力提高幅度變緩;TRC加固層增加到3層時,銹蝕柱的破壞形態(tài)發(fā)生了改變,破壞位置從柱中上部移到了柱中部區(qū)域。(3)在現(xiàn)有小偏心受壓柱正截面承載力計算模型基礎(chǔ)上,考慮氯鹽干濕循環(huán)作用以及TRC約束作用等影響,給出了氯鹽干濕循環(huán)環(huán)境下TRC加固小偏心柱正截面承載力計算模型,理論計算值與試驗實際值差別較小。
[Abstract]:Textile reinforced concrete (TRC) is a new type of composite material. TRC, which is composed of fiber woven net and high performance concrete, not only has some advantages of FRP reinforcement, but also has the following advantages: first, The high performance concrete can improve the coordination between the strengthened layer and the concrete base, and can resist the harm of high temperature environment such as fire. Secondly, the density, anti-segregation, high fluidity of the high performance concrete, etc. It can repair the cracks on the surface of the damaged structure and add a layer of corrosion resistant protective layer to the steel bar. In this paper, the degradation mechanism of RC eccentric columns strengthened by TRC in dry and wet environment is studied, based on the special project of frontier scientific research of China University of Mining and Technology. The compressive behavior of small eccentric RC columns strengthened with TRC under dry and wet chloride cycle is studied. The results are as follows: (1) in the study of the compressive performance of small eccentric RC columns strengthened by TRC, the number of fiber woven mesh layers and the ratio of length to slenderness are taken into account in the study of the compressive performance of small eccentric RC columns strengthened by TRC. The influence of the ratio of reinforcement and the content of PVA staple fiber, the number of dry and wet cycles of chlorine salt, the coupling effect of load and chloride environment on the compressive properties of strengthened columns are discussed. The results show that the strengthening effect of TRC on small eccentric columns is better in the dry and wet environment of chlorine salt, and the reinforcement effect increases with the increase of the number of TRC layers, but the increase of the reinforcement effect becomes slower when the strengthening layer is increased to 4 layers. The reduction of slenderness ratio helps to improve the bearing capacity of strengthening columns, and the reinforcement ratio and the amount of PVA short cut fibers increase to a certain extent, which can help to improve the strengthening effect of TRC. With the increase of cycle times of chlorine salt drying and wetting, the strengthening effect of TRC is decreasing, and the damage to the compressive performance of TRC strengthened column is obvious by the coupling action of load and chlorine salt environment, and with the increase of continuous load, (2) in the study of the compressive performance of small eccentric corroded RC columns strengthened by TRC, the effect of different fiber woven mesh layers and the comparison with non-corroded columns are considered. The results show that the brittleness of the corroded column is stronger than that of the non-corroded column, and the TRC reinforcement has a better effect, which provides a good resistance to chlorine salt erosion and restraint effect, and the corroded column is strengthened with a layer of TRC. The bearing capacity is obviously increased, but the number of strengthened layers continues to increase. When the increasing range of TRC reinforcement layer increases to 3 layers, the failure pattern of the corroded column changes. The failure position is moved from the middle and upper part of the column to the middle part of the column. (3) based on the existing calculation model of the normal section bearing capacity of the small eccentrically compressed column, the effects of chlorine salt dry-wet cycle and TRC constraint are considered. The calculation model of normal section bearing capacity of small eccentric column strengthened by TRC under chlorine salt dry-wet cycle environment is presented. The difference between the theoretical calculation value and the experimental value is small.
【學位授予單位】：中國礦業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU375.3

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