本文選題：GFRP + 抗浮錨桿�。� 參考：《青島理工大學(xué)》2013年碩士論文

【摘要】：地鐵、地下商場(chǎng)和地下停車場(chǎng)等地下結(jié)構(gòu)由于地下水存在而面臨抗浮問題。一般建筑工程多采用抗浮錨桿作為抗浮措施，而地鐵工程抗浮措施通常采用抗拔樁。青島地區(qū)廣泛分布的中風(fēng)化和微風(fēng)化花崗巖地質(zhì)條件給抗拔樁施工帶來了很大困難，，甚至難以達(dá)到設(shè)計(jì)樁長(zhǎng)。傳統(tǒng)金屬錨桿成孔效率高，但由于錨固體直徑小，錨桿筋體保護(hù)層厚度有限，易受地鐵運(yùn)行中所產(chǎn)生的雜散電流電化學(xué)腐蝕而難以滿足永久性抗浮要求。玻璃纖維增強(qiáng)聚合物GFRP（Glass Fiber ReinforcedPolymer）錨桿具有抗拉強(qiáng)度高、結(jié)構(gòu)輕、耐腐蝕和不受雜散電流影響等特點(diǎn)，將GFRP錨桿應(yīng)用于地鐵抗浮工程中將有獨(dú)特優(yōu)勢(shì)。 目前GFRP筋用于抗浮錨桿的研究較少。GFRP抗浮錨桿與鋼筋抗浮錨桿在內(nèi)錨固端錨固機(jī)理、應(yīng)力分布規(guī)律方面沒有系統(tǒng)的對(duì)比分析；GFRP抗浮錨桿外錨固端變形特性和新型纖維增強(qiáng)塑料錨具等方面的理論尚不完善。 為研究GFRP錨桿用于地鐵抗浮工程的可行性，推廣GFRP材料的應(yīng)用范圍。在課題組前期進(jìn)行的鋼筋抗浮錨桿和GFRP抗浮錨桿試驗(yàn)研究的基礎(chǔ)上，本文對(duì)兩種錨桿的承載特性做了對(duì)比分析研究，得出了兩種錨桿在第一界面應(yīng)力分布規(guī)律方面的異同、內(nèi)錨固端錨固承載力及各自的破壞機(jī)理。 在GFRP抗浮錨桿外錨固方面，本文設(shè)計(jì)對(duì)拉試驗(yàn)對(duì)GFRP錨桿外錨固端荷載-滑移特性和一種新型托盤螺母錨具進(jìn)行試驗(yàn)研究。在試驗(yàn)研究的基礎(chǔ)上，本文利用有限元程序ANSYS對(duì)試驗(yàn)中兩種不同錨固長(zhǎng)度的試件建立模型進(jìn)行了荷載-滑移關(guān)系的計(jì)算分析。本文的主要研究成果如下： （1）本文詳細(xì)分析了鋼筋錨桿和GFRP錨桿的承載機(jī)理與承載力的決定因素。以兩種材料各自的特性為出發(fā)點(diǎn)，對(duì)兩種錨桿出現(xiàn)的不同破壞形式和破壞機(jī)理進(jìn)行了分析。歸納整理了國(guó)內(nèi)外關(guān)于兩種材料筋體在混凝土中錨固長(zhǎng)度的計(jì)算公式和粘結(jié)滑移本構(gòu)模型。 （2）GFRP錨桿可通過植入光纖光柵傳感器進(jìn)行錨桿內(nèi)力的測(cè)試，通過植入筋體的方式可得到較高的成活率和測(cè)試精度。試驗(yàn)結(jié)果詳細(xì)分析了兩種錨桿工作狀態(tài)下軸力和剪應(yīng)力分布規(guī)律方面的異同點(diǎn)，并對(duì)應(yīng)力分布曲線的不同之處進(jìn)行了分析。 （3）在GFRP錨桿外錨固試驗(yàn)中，對(duì)拉試件的試驗(yàn)方式避免了傳統(tǒng)錨桿試驗(yàn)中夾具對(duì)GFRP筋體的破壞，省去了對(duì)筋體的復(fù)雜處理和保護(hù)措施，有效的進(jìn)行了拉拔試驗(yàn)。試驗(yàn)過程簡(jiǎn)單流暢，試驗(yàn)效率大大提高。對(duì)GFRP在混凝土中的臨界錨固長(zhǎng)度進(jìn)行了試驗(yàn)分析，兩種不同錨固長(zhǎng)度的純筋錨固試件發(fā)生了兩種不同的破壞形式，確定了臨界錨固長(zhǎng)度的取值范圍。對(duì)新型玻璃纖維材料錨具的錨固效果和錨固效率進(jìn)行了分析，并提出了錨具進(jìn)一步改進(jìn)的建議。 （4）本文通過試驗(yàn)分析得出了GFRP筋在混凝土中的荷載-滑移曲線，并用ANSYS進(jìn)行了外錨固端的模擬分析。文章認(rèn)為在相應(yīng)的極限荷載作用下，內(nèi)錨固端和外錨固端變形均較小，錨桿的內(nèi)外錨固端變形之和在工程允許范圍內(nèi)。
[Abstract]:The underground structures , such as subway , underground mall and underground parking lot , are faced with anti - floating problems due to the existence of underground water . Generally , anti - floating anchor rods are used as anti - floating measures in general construction projects , and the anti - floating measures of subway engineering are often adopted as anti - uplift measures . The traditional metal anchor rod has high hole efficiency , but it is difficult to meet the permanent anti - floating requirement due to the small diameter of anchor solid and limited thickness of the protective layer of the anchor bar . The glass fiber reinforced polymer ( Glass Fiber Reinforced Polymer ) anchor rod has the characteristics of high tensile strength , light structure , corrosion resistance and no influence on stray current , and the like , and the glass fiber reinforced polymer ( glass fiber reinforced polymer ) anchor rod has unique advantages in the anti - floating engineering of the subway .

At present , there is little research on the anti - floating anchor rod in the present invention , and there is no systematic comparative analysis on the anchoring mechanism and stress distribution law of the anchor end , including the anti - floating anchor rod and the anti - floating anchor rod of the steel bar .
The theory of the deformation characteristics and the new fiber - reinforced plastic anchorage for the anchorage end of the anti - floating anchor rod is not perfect .

In order to study the feasibility of the anti - floating bolt for metro and the application range of it , the bearing characteristics of two kinds of anchor rods are compared and analyzed , and the similarities and differences of the two kinds of anchor rods in the first interface stress distribution law are obtained , and the anchoring capacity of the anchor ends and the failure mechanism are obtained .

In this paper , the load - slip characteristic and a new type of tray nut anchorage are studied by using finite element program ANSYS .

( 1 ) In this paper , the bearing mechanism and the bearing capacity are analyzed in detail . The different damage form and failure mechanism of two kinds of anchor rods are analyzed based on their respective characteristics .

( 2 ) The anchor bolt can be tested by implanting the fiber grating sensor to test the internal force of the anchor rod , and the higher survival rate and the test precision can be obtained through the way of implanting the rib body . The test results provide a detailed analysis of the similarities and differences between the axial force and the shear stress distribution law in the working state of the two anchor rods , and the difference of the stress distribution curve is analyzed .

( 3 ) In the experiment of anchor bolt external anchoring , the failure of the fixture in the traditional anchor rod test is avoided , the complicated treatment and protection measures of the bar body are omitted , and the drawing test is carried out effectively . The experimental results show that the critical anchorage length in the concrete is greatly improved . The anchoring effect and the anchoring efficiency of the new type glass fiber material anchorage are analyzed , and the suggestion of further improvement of the anchorage device is proposed .

( 4 ) In this paper , the load - slip curve in concrete is obtained by means of experimental analysis , and the simulation analysis of the external anchoring end is carried out by ANSYS . It is concluded that the deformation of the inner and outer anchoring ends of the anchor rod is small under the action of the corresponding ultimate load , and the inner and outer anchoring ends of the anchor rod are deformed and are within the allowable range of the project .
【學(xué)位授予單位】：青島理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU476

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