【摘要】：碳纖維增強(qiáng)塑料(Carbon Fiber Reinforced Plastics簡(jiǎn)稱CFRP),具有輕質(zhì)、高強(qiáng)、耐腐蝕等優(yōu)點(diǎn),在國(guó)內(nèi)外工程結(jié)構(gòu)加固中得到了越來(lái)越廣泛的應(yīng)用。碳纖維板和碳纖維布在結(jié)構(gòu)加固中比較常用,用量遠(yuǎn)大于其它類型的纖維材料。與碳纖維布相比,碳纖維板材具有質(zhì)量好、性能穩(wěn)定、施工便捷等優(yōu)點(diǎn),碳纖維布在結(jié)構(gòu)加固中總是需要進(jìn)行浸漬樹(shù)脂的施工環(huán)節(jié),而現(xiàn)場(chǎng)浸漬樹(shù)脂的方法存在質(zhì)量不穩(wěn)定,缺陷較多的問(wèn)題,故在預(yù)應(yīng)力CFRP加固技術(shù)中,預(yù)應(yīng)力碳纖維板是主要的研究對(duì)象。在預(yù)應(yīng)力碳纖維板加固技術(shù)中,錨夾具的可靠性是該技術(shù)性能優(yōu)劣或成敗的關(guān)鍵�？煽康亩瞬垮^固是預(yù)應(yīng)力碳纖維板加固方法的前提條件,也是提高碳纖維板材強(qiáng)度利用率必須首先解決的問(wèn)題。不可靠的錨夾具由于不能實(shí)現(xiàn)對(duì)碳纖維板的可靠夾持和錨固,預(yù)應(yīng)力張拉水平就很低,且碳纖維板的使用應(yīng)力水平也不易達(dá)到較高的水平,或者因?yàn)樘祭w維板在錨夾具內(nèi)發(fā)生滑移而使碳纖維板剝離或者產(chǎn)生較大的預(yù)應(yīng)力損失。預(yù)應(yīng)力碳纖維板加固技術(shù)發(fā)展到如今,其錨夾具的種類有多種,但在我國(guó)橋梁加固工程中常用主要是楔形夾片式錨具(以下簡(jiǎn)稱夾片錨)、平板類型錨夾具(以下簡(jiǎn)稱平板錨)、波形齒夾具錨(以下簡(jiǎn)稱波形錨),其中夾片錨和波形錨的性能比較穩(wěn)定,本文針對(duì)這兩種錨夾具進(jìn)行了對(duì)比試驗(yàn)研究,對(duì)兩種錨夾具的各項(xiàng)力學(xué)性能指標(biāo)進(jìn)行測(cè)試和對(duì)比,找出兩種錨夾具的的性能的異同,為工程應(yīng)用及選擇提供依據(jù)。在本文中,參照《預(yù)應(yīng)力筋用錨具、夾具和連接器GB/T14370-2007》對(duì)傳統(tǒng)預(yù)應(yīng)力筋的錨夾具性能檢測(cè)方法,專門設(shè)計(jì)了波形錨-碳纖維板組裝件、夾片錨-碳纖維板組裝件進(jìn)行靜力破斷試驗(yàn),針對(duì)兩種不同形式錨具的各項(xiàng)實(shí)測(cè)數(shù)據(jù)進(jìn)行性能對(duì)比,得到了如下主要成果:①夾片錨從設(shè)計(jì)原理上是一種“越拉越緊”的結(jié)構(gòu),為避免產(chǎn)生過(guò)大的擠壓應(yīng)力(碳纖維板的抗擠壓能力較弱),那么夾片設(shè)計(jì)角度不宜大,且?jiàn)A片與錨杯之間存在角度差,故在“夾片錨-碳纖維板組裝件”的靜力拉伸中,實(shí)測(cè)滑移量大大高于“波形錨-碳纖維板組裝件”。而滑移量小,對(duì)控制預(yù)應(yīng)力張拉精度和控制預(yù)應(yīng)力損失較為有利。②基于文獻(xiàn)資料設(shè)計(jì)的夾片錨對(duì)低強(qiáng)度碳纖維板能提供較好的錨固,但對(duì)較高強(qiáng)度的碳纖維板不能提供可靠的錨固。③在組裝件破斷試驗(yàn)中,兩種錨夾具在碳纖維板的最終破壞形態(tài)方面差異較大,“波形錨-碳纖維板組裝件”中的碳纖維板都能出現(xiàn)“發(fā)絲狀”的破斷形式,沒(méi)有局部或整體的碳纖維板滑移,而“夾片錨-碳纖維板組裝件”主要是滑移和局部斷絲。
[Abstract]:Carbon fiber reinforced plastic (Carbon Fiber Reinforced Plastics), referred to as CFRP), has been more and more widely used in strengthening engineering structures at home and abroad because of its advantages of light weight, high strength and corrosion resistance. Carbon fiber sheet and carbon fiber cloth are commonly used in structural strengthening, and the amount of carbon fiber sheet is much larger than that of other kinds of fiber materials. Compared with carbon fiber sheet, carbon fiber sheet has the advantages of good quality, stable performance, convenient construction, etc. In structural strengthening, carbon fiber sheet always needs the construction link of impregnated resin, but the method of field impregnating resin is unstable in quality. There are many defects, so the prestressed carbon fiber slab is the main research object in the prestressed CFRP reinforcement technology. The reliability of anchor fixture is the key to the performance of prestressed carbon fiber slab. Reliable end Anchorage is a prerequisite for the reinforcement of prestressed carbon fiber sheet, and it is also a problem that must be solved in order to improve the strength utilization ratio of carbon fiber sheet. Because the unreliable anchor fixture can not realize the reliable clamping and anchoring to the carbon fiber sheet, the prestressing tension level is very low, and the use stress level of the carbon fiber plate is not easy to reach a higher level. Or because carbon fiber sheet slips in the anchor fixture, the carbon fiber sheet is peeled off or has a large loss of prestress. With the development of prestressed carbon fiber sheet reinforcement technology, there are many kinds of anchors and clamps, but the wedge-shaped clamped anchors (hereinafter referred to as clamped anchors) are commonly used in bridge strengthening projects in China. The performance of plate type anchor fixture (hereinafter referred to as flat anchor), waveform tooth clamp anchor (hereinafter referred to as waveform anchor) is relatively stable. The mechanical properties of the two anchors are tested and compared to find out the similarities and differences of the two anchors, and to provide the basis for engineering application and selection. In this paper, the corrugated anchorage-carbon fiber plate assembly is specially designed with reference to the test method for the performance of traditional prestressed tendons anchors, clamps and connectors, which are called "Anchorage for prestressed tendons, fixtures and connectors". The static breaking test of clamped anchor and carbon fiber sheet assembly is carried out. The performance comparison of the measured data of two different kinds of anchors is carried out. The main results are as follows: (1) the clamping anchor is a kind of structure which is "more and more tight" in design principle. In order to avoid the excessive extrusion stress (the anti-extrusion ability of the carbon fiber sheet is weak), the design angle of the clamp should not be large, and the angle between the clip and the anchor cup is different, so in the static tension of the "clip anchor-carbon fiber plate assembly", The measured slippage is much higher than the "corrugated Anchor-carbon Fiber Plate Assembly". The slippage is small, which is beneficial to control the precision of prestress tensioning and controlling the loss of prestress. (2) the sandwich anchors designed based on literature data can provide better anchoring for low strength carbon fiber sheets. But the high strength carbon fiber sheet can not provide reliable Anchorage. 3 in the breaking test of the assembly, the difference between the two kinds of anchoring fixture in the final failure form of the carbon fiber sheet is great. In "corrugated Anchor-carbon Fiber Plate Assembly", there is "hair-like" broken form of carbon fiber sheet, and there is no partial or integral slippage of carbon fiber plate, while "clip anchor-carbon fiber board assembly" mainly consists of slippage and partial broken wire.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U445.72

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本文編號(hào)：2405450