本文選題：FRP筋 + 夾片式錨具��； 參考：《浙江大學(xué)》2013年碩士論文

【摘要】：混凝土與FRP筋的粘結(jié)將直接影響其長期工作性能,現(xiàn)階段相關(guān)試驗研究主要針對FRP筋的類型、FRP筋的粘結(jié)長度、FRP筋的直徑、FRP筋的表面形狀及混凝土強度研究FRP與混凝土長期粘結(jié)性能變化,但是針對外部環(huán)境作用,特別是海水鹽度及潮汐循環(huán)作用對粘結(jié)性能影響卻一直沒有得到重視。近海和沿海區(qū)域的高侵蝕環(huán)境導(dǎo)致鋼筋混凝土耐久性退化嚴重,成為FRP筋代替鋼筋的重要原因之一。盡管現(xiàn)階段針對FRP筋的耐久性試驗考慮了侵蝕環(huán)境的影響,但侵蝕性海洋環(huán)境下FRP筋與混凝土粘結(jié)性能尚未見報道。相對于海洋大氣環(huán)境和海洋水下環(huán)境,海洋潮汐環(huán)境的干濕交替作用將對混凝土孔隙結(jié)構(gòu)和FRP筋的耐久性能和兩者之間的粘結(jié)退化帶來更為顯著的影響。 1.基于FRP筋夾片式錨具試驗研究獲取的極限承載力、滑移值等測試信息建立3D有限元模型,采用數(shù)值模擬方法針對錨固體系開展非線性受力分析,模型分析與基準試驗在滑移動態(tài)演變過程、失效形態(tài)和測試數(shù)值上均具有高度的吻合率和精度。鑒于試驗規(guī)模的局限性,試驗獲取的測試參數(shù)無法滿足FRP筋錨具設(shè)計的需要,利用有限元進行夾片式錨具受力分析,討論了錨環(huán)錐角、夾片與錨環(huán)之間的角度差、鋁套管厚度、夾片預(yù)緊力、夾片與錨環(huán)之間的初始接觸位置、錨具長度等參數(shù)對錨具性能的影響,通過數(shù)值分析確定上述參數(shù)的推薦取值范圍,對FRP筋夾片式錨具設(shè)計及改進提供參考和借鑒。 2.本試驗以工程調(diào)查的海水鹽度制作海水樣本溶液,通過添加不同鹽度的溶液制作了74個FRP筋拉拔試件和36個立方體伴隨試塊,以一定濃度鹽溶液干濕交替對混凝土粘結(jié)構(gòu)件進行海洋潮汐環(huán)境作用模擬,測試經(jīng)歷不同潮汐循環(huán)下的混凝土粘結(jié)試件的拉拔曲線,旨在獲取潮汐環(huán)境下FRP筋與混凝土粘結(jié)退化規(guī)律。 3.在本文試驗以及已有試驗研究的基礎(chǔ)上,提出了BFRP筋與混凝土粘結(jié)滑移退化理論模型,并與試驗所得粘結(jié)滑移曲線進行比較,模型曲線與試驗曲線吻合良好。同時利用ANSYS程序?qū)FRP筋與混凝土拉拔試件進行有限元模擬,并系統(tǒng)總結(jié)出了考慮粘結(jié)滑移的BFRP筋與混凝土構(gòu)件的ANSYS程序有限元分析建模和計算方法。采用ANSYS有限元軟件對試件進行數(shù)值模擬,將試驗曲線與數(shù)值模擬曲線進行對比,并對模型中BFRP筋的應(yīng)力應(yīng)變進行分析研究,驗證ANSYS軟件數(shù)值模擬結(jié)果的正確性。
[Abstract]:The bond between concrete and FRP bars will directly affect its long-term working performance.At present, the research on the long-term bond behavior between FRP and concrete is mainly focused on the bond length and the surface shape of FRP tendons and the strength of concrete, but the effect of external environment on the bond behavior between FRP and concrete is also discussed.In particular, the effect of seawater salinity and tidal cycle on bond properties has been neglected.The durability of reinforced concrete is degraded seriously by high erosion environment in offshore and coastal areas, which is one of the important reasons why FRP bars replace steel bars.Although the effect of erosion environment is taken into account in the durability test of FRP tendons at present, the bond properties between FRP tendons and concrete in erosive marine environment have not been reported.Compared with the marine atmospheric environment and the marine underwater environment, the interaction of dry and wet in the marine tidal environment will have a more significant effect on the durability of concrete pore structure and the durability of FRP bars and the bond degradation between them.1.A 3D finite element model is established based on the testing information of ultimate bearing capacity and slip value obtained from the experimental study of FRP reinforcement clamped Anchorage, and the nonlinear force analysis of the Anchorage system is carried out by numerical simulation method.The model analysis and the benchmark test have a high coincidence rate and precision in the dynamic evolution of slip, failure form and testing value.In view of the limitation of the scale of the test, the test parameters obtained from the test can not meet the needs of the design of the anchor with FRP bars. The stress analysis of the clamped Anchorage is carried out by using finite element method. The cone angle of the anchor ring, the angle difference between the clamp and the anchor ring, and the thickness of the aluminum casing are discussed.The influence of the pretightening force, the initial contact position between the clip and the anchor ring, the length of the anchor and other parameters on the performance of the anchor is obtained. The recommended range of the above parameters is determined by numerical analysis.It provides reference for the design and improvement of FRP clip Anchorage.2.In this experiment, the seawater sample solution was made from the seawater salinity investigated by engineering, and 74 FRP bar drawing specimens and 36 cube concomitant test pieces were made by adding different salinity solutions.The effect of ocean tide on concrete adhesive structure was simulated by alternating dry-wet with a certain concentration of salt solution, and the drawing curves of concrete bonded specimens under different tidal cycles were tested.The purpose of this paper is to obtain the law of bond degradation between FRP bars and concrete in tidal environment.3.On the basis of the experiments in this paper and the existing experimental studies, a theoretical model of bond-slip degradation between BFRP bars and concrete is proposed, and compared with the bond-slip curves obtained from the tests, the model curves are in good agreement with the experimental curves.At the same time, the finite element analysis method of BFRP bar and concrete drawing specimen is simulated by ANSYS program, and the ANSYS program finite element analysis modeling and calculation method of BFRP bar and concrete member considering bond-slip are summarized systematically.The ANSYS finite element software was used to simulate the specimen. The test curve was compared with the numerical simulation curve, and the stress and strain of the BFRP bars in the model were analyzed and studied to verify the correctness of the numerical simulation results of the ANSYS software.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU377

【參考文獻】

相關(guān)期刊論文 前10條

1 張鵬;江世永;熊曄;飛渭;;芳綸纖維塑料筋混凝土的粘結(jié)性能試驗研究[J];四川建筑科學(xué)研究;2007年03期

2 王明超;張佐光;孫志杰;李敏;;連續(xù)玄武巖纖維及其復(fù)合材料耐腐蝕特性[J];北京航空航天大學(xué)學(xué)報;2006年10期

3 薛偉辰;不同試驗方法對GFRP筋粘結(jié)強度的影響研究[J];玻璃鋼/復(fù)合材料;2003年05期

4 李趁趁;黃承逵;高丹盈;;特定環(huán)境下FRP與混凝土正拉黏結(jié)性能試驗研究[J];大連理工大學(xué)學(xué)報;2006年S1期

5 王大強;劉曉麗;汪輝;畢巧巍;;纖維筋與高強纖維混凝土的粘結(jié)性能[J];低溫建筑技術(shù);2011年06期

6 霍文靜;張佐光;王明超;李敏;孫志杰;;復(fù)合材料用玄武巖纖維耐酸堿性實驗研究[J];復(fù)合材料學(xué)報;2007年06期

7 郝慶多;王言磊;侯吉林;歐進萍;;GFRP帶肋筋粘結(jié)性能試驗研究[J];工程力學(xué);2008年10期

8 胡顯奇,羅益鋒,申屠年;玄武巖連續(xù)纖維及其復(fù)合材料[J];高科技纖維與應(yīng)用;2002年02期

9 江朝華;趙輝;陳達;張瑋;;玄武巖纖維及聚丙烯纖維對水泥砂漿性能影響的對比分析[J];硅酸鹽通報;2007年06期

10 李為民;許金余;;玄武巖纖維對混凝土的增強和增韌效應(yīng)[J];硅酸鹽學(xué)報;2008年04期

相關(guān)博士學(xué)位論文 前1條

1 蔣田勇;碳纖維預(yù)應(yīng)力筋及拉索錨固系統(tǒng)的試驗研究和理論分析[D];湖南大學(xué);2008年

，

本文編號：1745589