發(fā)布時(shí)間：2018-04-27 00:02

  本文選題：織物增強(qiáng)混凝土 + 耐久性　； 參考：《江蘇科技大學(xué)》2017年碩士論文

【摘要】：我國建筑工業(yè)化的蓬勃發(fā)展,勢(shì)必帶來建筑工程史上革命性的進(jìn)步,本文研究的織物增強(qiáng)混凝土(TRC)永久性模板是采用不銹鋼板網(wǎng)固定纖維織物網(wǎng),并用高性能細(xì)骨料混凝土包裹預(yù)制成模板。一方面永久性模板對(duì)內(nèi)部現(xiàn)澆混凝土可以起到保護(hù)作用,增強(qiáng)其耐久性。另一方面,永久性模板作為結(jié)構(gòu)體的一部分參與結(jié)構(gòu)受力,從而提高了結(jié)構(gòu)的力學(xué)性能,而織物增強(qiáng)混凝土永久性模板的應(yīng)用更需要應(yīng)對(duì)耐久性的挑戰(zhàn)。本文主要研究內(nèi)容包括力與碳化作用耦合情況下TRC薄板的力學(xué)性能試驗(yàn)研究和力與氯鹽侵蝕耦合作用下TRC疊合梁的抗彎性能試驗(yàn)研究,研究的主要內(nèi)容有:(1)對(duì)若干TRC薄板和素混凝土薄板構(gòu)件進(jìn)行持荷加速碳化,并在正常氣候環(huán)境下進(jìn)行破壞加載試驗(yàn),觀測(cè)其破壞形態(tài)的變化和極限承載能力的退化,分析其破壞機(jī)理,并與素混凝土薄板碳化后力學(xué)性能的退化進(jìn)行對(duì)比,研究表明:TRC薄板在彎曲性能以及剪切性能上相比普通混凝土薄板具有較大優(yōu)勢(shì),承載力大幅度提升,變形能力得到增強(qiáng),TRC薄板體現(xiàn)出延性破壞的特點(diǎn),混凝土先出現(xiàn)裂縫,隨后纖維織物網(wǎng)被拉斷、剪斷。而普通現(xiàn)澆混凝土薄板裂縫的出現(xiàn)預(yù)示著加載的基本結(jié)束,體現(xiàn)出脆性破壞的特點(diǎn)。隨著碳化時(shí)間的不斷增加,TRC薄板和普通混凝土薄板的承載力均有不同程度的提高。(2)對(duì)TRC薄板的開裂荷載和極限抗彎承載力進(jìn)行了理論推導(dǎo),得到了開裂荷載和極限抗彎承載力的計(jì)算公式,并通過本試驗(yàn)中的數(shù)據(jù)對(duì)計(jì)算公式進(jìn)行了驗(yàn)證,得到了較為理想的計(jì)算效果。根據(jù)已有的碳化深度預(yù)測(cè)模型計(jì)算了普通混凝土薄板的碳化深度,并與TRC薄板的碳化深度進(jìn)行對(duì)比,分析差異原因,研究表明:TRC薄板的碳化深度小于普通混凝土薄板。(3)制作TRC疊合梁構(gòu)件,并采用電化學(xué)侵蝕方法,加速侵蝕,繼而開展抗彎試驗(yàn),試驗(yàn)制作了2根對(duì)比梁和5根TRC疊合梁,分析了氯鹽侵蝕作用下因溶液濃度、持荷狀態(tài)、銹蝕率三因素的不同對(duì)試件受彎性能的影響。研究表明:銹蝕狀態(tài)下TRC疊合梁的力學(xué)性能退化情況優(yōu)于普通梁;U型TRC梁模可以阻礙氯離子的滲入,延緩梁內(nèi)鋼筋銹蝕;在較小的銹蝕率下,TRC疊合梁的屈服荷載和極限荷載略有提升。而隨著溶液濃度的提高,鋼筋銹蝕率逐漸增大,TRC疊合梁的承載力體現(xiàn)出下降的趨勢(shì)。(4)對(duì)銹蝕狀態(tài)下TRC疊合梁的抗彎承載力進(jìn)行理論分析,運(yùn)用結(jié)構(gòu)力學(xué)、材料力學(xué)以及數(shù)學(xué)的知識(shí)推導(dǎo)了力與氯鹽侵蝕耦合作用下TRC疊合梁的抗彎承載力計(jì)算公式,經(jīng)與實(shí)際試驗(yàn)值比較,發(fā)現(xiàn)計(jì)算值與試驗(yàn)值較為吻合。
[Abstract]:The vigorous development of construction industrialization in China is bound to bring about revolutionary progress in the history of building engineering. The permanent template of fabric reinforced concrete (TRCC) studied in this paper is to use stainless steel plate mesh to fix fiber fabric mesh. High performance fine aggregate concrete is prefabricated into a formwork. On the one hand, the permanent formwork can protect the inner cast-in-place concrete and enhance its durability. On the other hand, as a part of the structure, the permanent formwork takes part in the structural force, which improves the mechanical properties of the structure, while the application of the fabric reinforced concrete permanent template needs to meet the challenge of durability. In this paper, the mechanical properties of TRC thin plates under the coupling of force and carbonation and the bending behavior of TRC composite beams under the coupling of force and chloride corrosion are studied. The main contents of this study are: (1) accelerated carbonization of some TRC thin and plain concrete thin plate members, and the failure loading tests were carried out under normal climatic conditions. The change of failure patterns and the degradation of ultimate bearing capacity were observed. The failure mechanism is analyzed and compared with the degradation of mechanical properties of plain concrete thin plates after carbonization. The results show that the bending and shear properties of TRC / TRC thin plates are superior to those of ordinary concrete thin plates, and the bearing capacity of TRC thin plates is greatly enhanced. The reinforced TRC thin plate shows the characteristics of ductile failure. The concrete first appears cracks and then the fabric mesh is pulled and shearing. The crack of common cast-in-place concrete plate indicates the end of loading and shows the characteristic of brittle failure. With the increasing of carbonization time, the bearing capacity of TRC thin plate and ordinary concrete thin plate have been improved to some extent.) the cracking load and ultimate flexural capacity of TRC thin plate have been theoretically deduced. The calculation formulas of cracking load and ultimate flexural capacity are obtained, and the formula is verified by the data in this experiment, and a more ideal calculation result is obtained. According to the existing prediction model of carbonation depth, the carbonation depth of ordinary concrete thin plate is calculated, and compared with the carbonation depth of TRC thin plate, the reason of the difference is analyzed. The results show that the carbonation depth of the TRC thin plate is less than that of the ordinary concrete thin plate. (3) the TRC composite beam is fabricated, and the electrochemical erosion method is used to accelerate the erosion. Then the bending test is carried out. Two contrast beams and five TRC composite beams are made. The effects of different concentration of solution, loading state and corrosion rate on the bending properties of the specimens were analyzed. The results show that the degradation of mechanical properties of TRC composite beams under rusty condition is better than that of ordinary beams with U-type TRC Liang Mo, which can hinder the penetration of chloride ions and delay the corrosion of steel bars in the beams. The yield load and ultimate load of TRC composite beams are increased slightly under lower corrosion rate. However, with the increase of solution concentration, the corrosion rate of steel bars increases gradually. The bearing capacity of TRC composite beams shows a decreasing trend. The flexural bearing capacity of TRC composite beams under corroded condition is analyzed theoretically, and the structural mechanics is used. The calculation formula of flexural bearing capacity of TRC composite beam under the coupling of force and chloride erosion is derived by the knowledge of material mechanics and mathematics. By comparing with the actual test value, it is found that the calculated value is in good agreement with the experimental value.
【學(xué)位授予單位】：江蘇科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU317

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 荀勇;徐業(yè)輝;尹紅宇;;織物增強(qiáng)混凝土永久模板疊合混凝土圓形短柱軸壓性能試驗(yàn)研究[J];混凝土;2016年01期

2 金偉良;吳航通;許晨;金駿;;鋼筋混凝土結(jié)構(gòu)耐久性提升技術(shù)研究進(jìn)展[J];水利水電科技進(jìn)展;2015年05期

3 尹世平;盛杰;賈申;葉桃;;TRC加固RC梁的彎曲疲勞破壞過程和應(yīng)變發(fā)展的試驗(yàn)研究[J];工程力學(xué);2015年S1期

4 荀勇;徐業(yè)輝;;纖維織物與鋼板網(wǎng)聯(lián)合增強(qiáng)混凝土薄板四點(diǎn)抗彎性能試驗(yàn)研究[J];混凝土與水泥制品;2015年06期

5 尹紅宇;吉晨彬;荀勇;孫帥;;智能TRC板加固RC梁力電性能試驗(yàn)研究[J];土木工程學(xué)報(bào);2015年S1期

6 徐業(yè)輝;李彬;荀勇;;織物增強(qiáng)混凝土薄板加固鋼筋混凝土梁的二次受彎性能試驗(yàn)研究[J];工業(yè)建筑;2015年01期

7 艾珊霞;尹世平;徐世p，

本文編號(hào)：1808256