- 摘 要
-
余芳，賈金青，宋玉普（大連理工大學(xué)海岸和近海工程國家重點實驗室，大連 116024）
［摘要］對不同鋼絞線腐蝕率下的部分預(yù)應(yīng)力混凝土梁進(jìn)行了靜力和疲勞試驗，通過分析開裂彎矩、跨中撓度、受拉區(qū)鋼筋應(yīng)變以及梁裂縫的發(fā)展規(guī)律，研究了鋼絞線腐蝕率對部分預(yù)應(yīng)力混凝土梁疲勞性能的影響。研究表明：鋼絞線腐蝕會顯著降低梁的疲勞壽命，是影響梁疲勞破壞形態(tài)的主要因素；腐蝕梁的撓度、應(yīng)變和裂縫發(fā)展同樣遵循無腐蝕梁的“三階段”規(guī)律；在相同疲勞次數(shù)下，腐蝕率越大，受拉區(qū)非預(yù)應(yīng)力鋼筋的應(yīng)變和梁的裂縫寬度越大，但梁跨中撓度受腐蝕率影響不顯著。
［關(guān)鍵詞］鋼絞線腐蝕； 預(yù)應(yīng)力混凝土梁； 疲勞性能
中圖分類號：TU378-2文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2012)01-0097-04
Experimental research on fatigue behavior of prestressed concrete beams with corroded steel strands
Yu Fang, Jia Jinqing, Song Yupu(State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China)
Abstract:The crackingmoment, midspan deflection, strain of steel in the tension region and the law of crack development were analyzed from the experiment of partly prestressed concrete beams, with different corrosion rates and under static and fatigue loads. On this basis, the effects, which corrosion rates of the steel strands have on the fatigue behavior, were studied. The results indicate that corrosion of steel strands,as a major factor to effect the failure mode of testing beams, can remarkably reduce the fatigue life of the beams. The deflection, strain and crack development of testing beams with corrosion, likewise, follow the regulation of “3-step” in the beams with non-corrosion. More the corrosion rate is, more the strain of normal steel in the tension region and the crack width of the beams are, with the same corrosion cycle, but the corrosion rate has a little influence on the midspan deflection.
Keywords:corrosion of steel strands； prestressed concrete beam； fatigue behavior
*科技部“863”計劃重大交通基礎(chǔ)設(shè)施核心技術(shù)項目（2007AA11Z133）。
作者簡介：余芳，博士研究生，Email：xn_yufang@yahoo.com.cn。
參考文獻(xiàn)
［1］SCHUPACK M A. Survey of the durability performance of post-tensioning tendons［J］. ACI Journal，1978，75(10)：501-510
［2］NGOC ANH VU,ARNAUD CASTEL,RAOUL FRANCOIS. Effect of stress corrosion cracking on stress-strain response of steel wires used in prestressed concrete beams［J］. Corrosion Science. 2009，51(6):1453-1459
［3］李富民，袁迎曙. 腐蝕鋼絞線預(yù)應(yīng)力混凝土梁的受彎性能試驗研究［J］. 建筑結(jié)構(gòu)學(xué)報，2010，31(2)：78-84
［4］劉椿，朱爾玉，朱曉偉. 受腐蝕預(yù)應(yīng)力混凝土橋梁受力檢算和試驗驗證［J］. 鐵道建筑，2005(12)：1-3
［5］藺恩超. 預(yù)應(yīng)力筋應(yīng)力腐蝕后預(yù)應(yīng)力混凝土梁的受力性能研究［D］. 揚州：揚州大學(xué)，2006
