發(fā)布時間：2018-08-26 10:55

【摘要】：纖維增強復合材料(FRP)具有輕質(zhì)、高強、耐腐蝕等優(yōu)點,在工程領(lǐng)域中有著較為廣泛的應用。FRP網(wǎng)格具有輕質(zhì)、高強、雙向受力、施工方便、可用于惡劣環(huán)境的施工等優(yōu)點,目前纖維增強復合材料網(wǎng)格在新建結(jié)構(gòu)中應用較少,其在新建結(jié)構(gòu)中應用的研究亦較少,制約其應用的一個重大因素是網(wǎng)格質(zhì)量穩(wěn)定性較差,因而不利于在結(jié)構(gòu)中推廣應用。本文將重點研究高性能玄武巖纖維網(wǎng)格高效穩(wěn)定的制備技術(shù)、網(wǎng)格短長期力學性能的評價方法、FRP網(wǎng)格-鋼筋混凝土組合柱基本受壓性能三個方面,為FRP-鋼筋混凝土組合柱的應用提供設(shè)計基礎(chǔ)。本文對以上問題,研究內(nèi)容如下：1.本文對FRP網(wǎng)格生產(chǎn)工藝進行了設(shè)計與優(yōu)化,通過網(wǎng)格模具的選擇、纖維種類、樹脂種類、成型方式等影響網(wǎng)格因素的嘗試,最終生產(chǎn)出外觀合格、抗拉強度高達900MPa、易彎曲的FRP網(wǎng)格產(chǎn)品；2.通過試驗制定出適用于BFRP網(wǎng)格的測試方法；針對網(wǎng)格厚度提出不同的錨固方法以及錨固步驟,即：網(wǎng)格厚度≤1mm,可不制作加強片,直接用砂紙包裹端口即可進行拉伸試驗；1mm網(wǎng)格厚度≤2mm,需使用鋁片作為加強片：網(wǎng)格厚度2mm,需采用鋼管進行錨固；針對不同厚度的BFRP網(wǎng)格拉伸試驗,發(fā)現(xiàn)隨著網(wǎng)格厚度的增長,網(wǎng)格強度逐漸降低；3.通過40℃堿環(huán)境下的吸濕稱重試驗和拉伸強度試驗探討了BFRP網(wǎng)格腐蝕規(guī)律,根據(jù)試驗結(jié)果得出了Fick曲線及強度退化公式,較好的預測了BFRP網(wǎng)格在40℃堿環(huán)境下的腐蝕退化規(guī)律；4.根據(jù)纖維復合材料腐蝕原理,將纖維復合材料的強度分為三個階段：Fick階段,非Fick階段1、非Fick階段2。Fick階段的腐蝕機理是纖維復合材料樹脂吸收腐蝕溶液中OH-而強度退化,退化速率為v1;非Fick階段1,腐蝕原理為樹脂開裂,腐蝕溶液侵蝕內(nèi)部纖維而強度退化,退化速率為v2;非Fick階段2,腐蝕原理為纖維與樹脂均已發(fā)生嚴重侵蝕,強度基本穩(wěn)定,退化速率為v3。其中V1v2v3；5.在網(wǎng)格能夠滿足強度和耐久性的前提下,研制出一種彎曲性能好的網(wǎng)格,該網(wǎng)格可以包裹在新建柱子內(nèi)部,起到良好的抗裂縫能力,從而保證試件在腐蝕環(huán)境中減少裂紋的寬度,延緩腐蝕溶液浸漬內(nèi)部筋材,起到了良好的耐腐作用。6. 通過48根FRP網(wǎng)格組合柱軸心受壓試驗,根據(jù)試驗數(shù)據(jù)分析纖維網(wǎng)格在組合柱中發(fā)揮的作用。通過網(wǎng)格厚度、網(wǎng)格層數(shù)、網(wǎng)格包裹柱的高度、網(wǎng)格所在位置、鋼筋所在位置、鋼筋配筋率等變量參數(shù)進行軸壓試驗,分析各個參量的影響量。從FRP網(wǎng)格組合柱承載能力、延性兩個角度分析FRP網(wǎng)格組合柱基本特性。7.基于試驗數(shù)據(jù)擬合出的BFRP網(wǎng)格-鋼筋混凝土組合柱極限應力公式,該公式可以為實際工程中FRP網(wǎng)格-鋼筋混凝土組合柱提供計算和設(shè)計基礎(chǔ)。
[Abstract]:Fiber reinforced composite (FRP) has the advantages of light weight, high strength, corrosion resistance and so on. It has been widely used in engineering field. It has the advantages of light weight, high strength, bidirectional force, convenient construction, and can be used in the construction of harsh environment, etc. At present, fiber reinforced composite meshes are seldom used in new structures, and their applications in new structures are also less studied. One of the major factors restricting the application of fiber reinforced composite meshes is the poor stability of mesh quality, which is not conducive to the popularization and application of new structures. In this paper, the preparation technology of high performance basalt fiber mesh with high efficiency and stability, the evaluation method of short and long term mechanical properties of the mesh and the basic compressive performance of FRP mesh-reinforced concrete composite column are studied. It provides a design basis for the application of FRP- reinforced concrete composite columns. In this paper, the contents of the above problems are as follows: 1. In this paper, the design and optimization of FRP mesh production process are carried out. Through the selection of grid mould, fiber type, resin type, molding method and other factors affecting the mesh, the appearance of the mesh is qualified. Tensile strength up to 900MPA, easy to bend the FRP mesh products. Different anchoring methods and anchoring steps are put forward according to the mesh thickness, that is, if the mesh thickness is less than 1mm, the tensile test can be carried out directly by wrapping the port with sandpaper without making the reinforcing plate. When the thickness of 1mm mesh is less than 2 mm, aluminum sheet is used as reinforcing plate, and steel tube is used for anchoring with 2mm mesh thickness. For BFRP mesh tensile test with different thickness, it is found that the mesh strength decreases gradually with the increase of mesh thickness. The corrosion law of BFRP mesh was discussed by the wet gravimetric test and tensile strength test under 40 鈩，

本文編號：2204653