本文選題：CFRP索 + 錨固系統(tǒng)��； 參考：《江蘇大學(xué)》2015年博士論文

【摘要】：斜拉橋因其外形美觀、跨越能力強(qiáng)、結(jié)構(gòu)剛度大等突出優(yōu)點(diǎn)而在大跨橋梁中受到青睞并廣泛采用。拉索是斜拉橋的一個(gè)重要受力構(gòu)件,傳統(tǒng)鋼拉索由于鋼材的極限強(qiáng)度、承載效率以及耐腐蝕性等問題已成為制約斜拉橋跨徑的重大因素。碳纖維增強(qiáng)塑料(Carbon Fiber Reinforced Polymer,簡稱CFRP)具有不銹蝕、無磁性、低松弛性、輕質(zhì)高強(qiáng)、抗疲勞等優(yōu)良特性,將CFRP索應(yīng)用于預(yù)應(yīng)力超大跨斜拉橋,具有較高的研究價(jià)值和廣闊的應(yīng)用前景。但是CFRP筋在縱、橫向材性上有較大差異,若以CFRP索替代鋼索,其錨固性能和錨具設(shè)計(jì)還存在尚未研究解決的問題。此外,相對于鋼索,CFRP索具有質(zhì)量輕、脆性大、彈性模量低等特點(diǎn),在惡劣環(huán)境下,極易發(fā)生風(fēng)致振動進(jìn)而導(dǎo)致橋梁破壞。本文依托國家自然科學(xué)基金項(xiàng)目—“基于高性能材料CFRP索的超大跨橋梁原型設(shè)計(jì)與相關(guān)問題研究(No.51078170)”,以CFRP索的錨固系統(tǒng)性能和風(fēng)致振動兩個(gè)重要方面為研究內(nèi)容,主要完成了以下工作：(1)對CFRP索錨固系統(tǒng)進(jìn)行理論分析和試驗(yàn)研究。研究各類型CFRP筋(索)錨固系統(tǒng)性能的適用性,建立適用的理論計(jì)算模型,并通過試驗(yàn)檢驗(yàn)理論計(jì)算模型的準(zhǔn)確性。優(yōu)化設(shè)計(jì)大噸位CFRP筋(索)錨具,提供設(shè)計(jì)和應(yīng)用建議。(2)基于流固耦合理論研究了CFRP拉索的風(fēng)致振動特性�；诹鞴恬詈侠碚摻FRP索結(jié)構(gòu)瞬態(tài)響應(yīng)的簡化模型,并利用相關(guān)軟件建立數(shù)值模型,研究分析強(qiáng)風(fēng)作用下CFRP索多種工況時(shí)的抗風(fēng)性能及瞬態(tài)動力學(xué)響應(yīng)特點(diǎn)和規(guī)律,對比相同條件下鋼拉索風(fēng)致振動的差異性。(3)基于準(zhǔn)定常假設(shè)研究CFRP拉索風(fēng)-雨致振特征。推導(dǎo)建立斜拉索風(fēng)-雨致振的簡化分析模型和穩(wěn)定性準(zhǔn)則,利用數(shù)值分析模型,研究分析CFRP拉索風(fēng)-雨致振特性,以及各參數(shù)對風(fēng)-雨致振的影響,初步探索CFRP拉索在風(fēng)-雨激勵下的運(yùn)動規(guī)律和機(jī)理及參數(shù)敏感性等問題。通過以上研究,優(yōu)化了CFRP筋(索)的錨固系統(tǒng),提出了大噸位錨具的設(shè)計(jì)建議；基于流固耦合理論推導(dǎo)了CFRP索在風(fēng)作用下的簡化模型,得到了CFRP索區(qū)別于鋼索的風(fēng)致振動瞬態(tài)特性及各種參數(shù)下風(fēng)-雨致振的特征和運(yùn)動規(guī)律,為CFRP索在纜索結(jié)構(gòu)橋梁中的應(yīng)用設(shè)計(jì)提供參考。
[Abstract]:Cable-stayed bridges are widely used in long-span bridges because of their outstanding advantages such as beautiful appearance, strong span ability and large structural stiffness. Cable is an important force member of cable-stayed bridge. Traditional steel cable has become a major factor restricting the span of cable-stayed bridge because of the limit strength, bearing efficiency and corrosion resistance of steel. Carbon Fiber Reinforced Polymer (CFRP) with carbon fiber reinforced plastics (CFRP) has the advantages of non-rust, non-magnetism, low relaxation, lightweight and high strength, fatigue resistance and so on. The application of CFRP cable in prestressed super-span cable-stayed bridge has high research value and broad application prospect. However, there are great differences in the longitudinal and transverse properties of CFRP bars. If CFRP cables are used instead of steel cables, the anchoring performance and the design of anchors are still unsolved. In addition, compared with the steel cable CFRP rigging, it has the characteristics of light weight, large brittleness and low elastic modulus, so it is easy to occur wind-induced vibration and lead to bridge failure in bad environment. Based on the project of National Natural Science Foundation of China-"prototype Design and related problems of Super large Span Bridge based on High-Performance material CFRP Cable (No.51078170)", this paper focuses on two important aspects of anchoring system performance and wind-induced vibration of CFRP cables. The main work is as follows: 1) theoretical analysis and experimental study on CFRP cable Anchorage system. The applicability of various types of CFRP bars (cables) Anchorage system is studied and the applicable theoretical calculation model is established. The accuracy of the theoretical calculation model is verified by experiments. Optimization design of large-tonnage CFRP tendons (cables) anchors and suggestions for design and application. (2) based on the fluid-solid coupling theory, the wind-induced vibration characteristics of CFRP cables are studied. Based on the fluid-solid coupling theory, the simplified model of transient response of CFRP cable structure is established, and the numerical model is established by using related software. The characteristics and laws of wind resistance and transient dynamic response of CFRP cable under various conditions under strong wind are studied and analyzed. The differences of wind-induced vibration of steel cables under the same conditions are compared. (3) based on quasi-steady hypothesis, the wind-rain vibration characteristics of CFRP cables are studied. The simplified analysis model and stability criterion of wind-rain vibration induced by stay cable are derived and established. By using numerical analysis model, the wind-rain vibration characteristics of CFRP cable and the influence of various parameters on wind-rain vibration are studied. The motion law, mechanism and parameter sensitivity of CFRP cables under wind-rain excitation were preliminarily explored. Through the above research, the anchoring system of CFRP tendons (cables) is optimized, and the design suggestions for large-tonnage anchors are put forward, and the simplified model of CFRP cables under wind action is derived based on the fluid-solid coupling theory. The transient characteristics of wind-induced vibration of CFRP cables different from those of steel cables and the characteristics and motion laws of wind-rain induced vibration under various parameters are obtained, which provides a reference for the application and design of CFRP cables in cable-structure bridges.
【學(xué)位授予單位】：江蘇大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2015
【分類號】：U448.27

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