本文選題：GFRP + 橋面板��； 參考：《華南理工大學(xué)》2014年碩士論文

【摘要】：鋼筋混凝土梁板式橋梁結(jié)構(gòu)因其良好的受力性能、造價便宜等優(yōu)點而廣泛用于高速公路橋梁建設(shè)中。通常情況下堿性混凝土包裹著鋼筋，使得鋼筋具有一定的耐腐蝕性。近年來環(huán)境污染問題日益嚴(yán)重以及除冰鹽的大量使用，現(xiàn)實中的鋼筋混凝土橋梁通常是帶裂縫工作，鋼筋暴露在外環(huán)境下導(dǎo)致鋼筋的銹蝕、外保護(hù)層的脫落，這將影響結(jié)構(gòu)的承載能力，增加橋梁的維修成本。纖維增強(qiáng)聚合物筋材（FRP bar）在外層酸性樹脂保護(hù)層的包裹下具有一定抗化學(xué)腐蝕能力，同時具有自重輕、強(qiáng)度高、膨脹系數(shù)同混凝土相近等優(yōu)點，為土木工程師解決橋梁的抗腐蝕、提高使用年限帶來了希望。現(xiàn)行FRP筋混凝土結(jié)構(gòu)設(shè)計規(guī)范配筋率要高于鋼筋混凝土板配筋率，加之FRP筋材的價格又高于鋼筋價格，因此阻礙了FRP筋材的推廣應(yīng)用。 研究表明：傳統(tǒng)梁板式混凝土橋梁中存在壓縮薄膜效應(yīng)。在橋梁面板設(shè)計時考慮這種效應(yīng)，能夠降低配筋率，降低建造成本。為了能夠更為顯著地降低維護(hù)成本，本課題設(shè)計一種新型的橋梁面板結(jié)構(gòu)，采用GFRP錨桿作為橫向約束構(gòu)件、橋面板內(nèi)不配筋材，結(jié)合壓縮薄膜效應(yīng)對模型進(jìn)行結(jié)構(gòu)設(shè)計和計算。該新型結(jié)構(gòu)體系外置GFRP筋材與混凝土的沒有直接接觸，避免了堿性的混凝土對GFRP酸性外保護(hù)層的損害。本文主要進(jìn)行了一下幾個方面的工作： 1.在前期改變支撐梁寬度的基礎(chǔ)上增加了兩組試驗，改變外置GFRP橫向約束構(gòu)件間距、和加載位置，對1:3比例縮小的橋面板進(jìn)行靜力加載試驗，測量模型在加載過程中的承載力、應(yīng)變、變形等數(shù)據(jù)，考察該新型結(jié)構(gòu)面板的基本力學(xué)性能，對承載力計算方法進(jìn)行探討。因為本次試驗為全GFRP配筋橋面結(jié)構(gòu)，，通常FRP受彎梁的延性較差，因此在研究了GFRP混凝土梁的抗彎延性進(jìn)行了初步研究，并將研究的成果用在了新型整橋試驗中。 2.研究和分析橋面板在輪胎荷載作用下，支撐梁的側(cè)向位移、橋面板的裂縫擴(kuò)展形態(tài)和破壞形式，揭示壓縮薄膜效應(yīng)的變化及對結(jié)構(gòu)性能的影響。 3.利用通用有限元軟件Abaqus對模型靜力加載過程進(jìn)行模擬。模擬結(jié)果能夠較好的與實驗數(shù)據(jù)吻合程度較好，充分證明有限元模型的合理性，在此基礎(chǔ)上進(jìn)行新型整體面板模型參數(shù)分析。 通過試驗和有限元分析發(fā)現(xiàn)：支撐梁寬度、外置GFRP橫向約束構(gòu)件、橋面板截面形式對整體面板的承載力有較大的影響。該新型橋面結(jié)構(gòu)能夠在保證橋梁結(jié)構(gòu)在承載力和建造費用不受影響的情況下，有效的提高結(jié)構(gòu)的耐久性，降低維護(hù)費用，解決了橋梁面板頻繁置換鋼筋對交通運(yùn)輸?shù)母蓴_與環(huán)境的破壞。
[Abstract]:Reinforced concrete beam-slab bridge structure is widely used in highway bridge construction because of its good mechanical performance and low cost. Usually, alkaline concrete is wrapped in steel bar, which makes the steel bar corrosion resistant to a certain extent. In recent years, the problem of environmental pollution is becoming more and more serious and the extensive use of deicing salt. In reality, reinforced concrete bridges usually work with cracks. The exposure of steel bars to the outside environment leads to the corrosion of steel bars and the fall off of the outer protective layer. This will affect the bearing capacity of the structure and increase the maintenance cost of the bridge. Fiber reinforced polymer bar (FbarRP) has some advantages such as light weight, high strength, close coefficient of expansion and so on, under the cover of outer layer of acid resin, it has the ability to resist chemical corrosion, and has the advantages of light weight, high strength and close to that of concrete, etc. It brings hope for civil engineers to solve the corrosion resistance of bridges and improve their service life. The reinforcement ratio of current FRP reinforced concrete structural design code is higher than that of reinforced concrete slabs, and the price of FRP reinforcement is higher than that of steel bar, which hinders the popularization and application of FRP reinforcement. The results show that the compression film effect exists in the traditional beam-slab concrete bridge. Considering this effect in the design of bridge panel, the reinforcement ratio can be reduced and the construction cost can be reduced. In order to reduce the maintenance cost more significantly, a new type of bridge panel structure is designed in this paper, in which GFRP anchor is used as the transverse constraint member, the bridge deck is not reinforced, and the model is designed and calculated with the compression membrane effect. The new structure system has no direct contact with concrete, which can avoid the damage of alkaline concrete to the acidic outer protective layer of GFRP. This article mainly carries on the following several aspects of work: 1. On the basis of changing the width of supporting beam in the early stage, two groups of tests were added to change the spacing and loading position of the lateral restrained members of the external GFRP. The static loading test was carried out on the bridge deck plate which was scaled down at 1:3, and the bearing capacity of the model was measured during the loading process. The basic mechanical properties of the new structural panel are investigated and the calculation method of bearing capacity is discussed. Because the ductility of FRP flexural beam is usually poor for the whole GFRP reinforced bridge deck structure, the flexural ductility of GFRP concrete beam is studied preliminarily, and the results are applied to the new type of bridge test. 2. The lateral displacement of the supporting beam and the crack propagation and failure form of the bridge deck are studied and analyzed under the tire load. The change of the compression film effect and the influence on the structure performance are revealed. 3. The static loading process of the model is simulated by the universal finite element software Abaqus. The simulation results are in good agreement with the experimental data, which fully proves the rationality of the finite element model. On this basis, the parameter analysis of the new integral panel model is carried out. Through the test and the finite element analysis, it is found that the width of the bracing beam, the lateral restrained member of the external GFRP and the section form of the deck slab have great influence on the bearing capacity of the whole slab. The new bridge deck structure can effectively improve the durability of the bridge structure and reduce the maintenance cost without affecting the bearing capacity and construction cost of the bridge structure. It solves the interference and environment damage caused by the frequent replacement of steel bar on bridge face.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U443.31

【參考文獻(xiàn)】

相關(guān)期刊論文 前2條

1 高丹盈;李士會;趙科;;樹脂改性對玻璃纖維增強(qiáng)聚合物筋材物理力學(xué)性能的影響[J];纖維復(fù)合材料;2008年01期

2 許賢敏;國外不配筋的砼橋面板簡介[J];云南交通科技;2000年04期

本文編號：1966682