深度銹蝕的無腹筋鋼筋混凝土梁承載機理分析*
董衛(wèi)1，村上祐貴2，大下英吉3，鈴木修一4，堤知明5
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（1 昆明理工大學, 昆明 650500；2 國立長岡工業(yè)高等專門學校, 新潟 940-8532；3 中央大學, 東京 112-8551；4 東電設計株式會社，東京 112-0015；5 東京電力株式會社, 橫濱 230-8510）［摘要］以位移控制加載，進行了深度銹蝕的無腹筋鋼筋混凝土梁的四點受彎加載試驗。通過銹蝕梁的縱筋的應變分布，計算各加載水平下縱筋與混凝土之間的粘結(jié)應力。試驗表明，深度銹蝕梁和非銹蝕梁的應變分布和應力歷程有著明顯的差異；加載初期階段，剪跨區(qū)域的平均粘結(jié)應力逐步增加至峰值，錨固區(qū)域的平均粘結(jié)應力無明顯增加；加載后期階段，剪跨區(qū)域的平均粘結(jié)應力逐步降低，而錨固區(qū)域的平均粘結(jié)應力顯著增加；隨著荷載的增加，深度銹蝕梁的承載機理由“梁效應”向“拱效應”轉(zhuǎn)變。基于“拱效應”的受力特征，提出了深度銹蝕梁極限荷載的計算方法。［關(guān)鍵詞］深度銹蝕鋼筋混凝土梁; 承載機理; 極限承載力; 粘結(jié)應力; 梁效應; 拱效應中圖分類號：TU375.1 文獻標識碼：A 文章編號：1002-848X(2014)05-0034-06Study on load resisting mechanism of seriously corroded reinforced concrete beam without stirrups in shear spanDong Wei1, Murakami Yuki2, Oshita Hideki3, Suzuki Shuichi4, Tsutsumi Tomoaki5(1 Kunming University of Science and Technology, Kunming 650500, China; 2 Nagaoka National College of Technology, Niigata 940-8532, Japan; 3 Chuo University, Tokyo 112-8551, Japan; 4 Tokyo Electric Power Services Co., Ltd., Tokyo 112-0015, Japan; 5 Tokyo Electric Power Co., Ltd., Yokohama 230-8510, Japan)Abstract: Four-point static bending tests of the seriously corroded reinforced concrete beam were conducted under displacement control. The bond stress between the main rebar and the concrete at any load level was computed, based on the longitudinal strain of the main rebar. It can be concluded that the strain distribution and the bond stress history of the seriously corroded reinforced concrete beam are different from that of non-corroded beam. The bond stress in the shear span increases to peak value and the bond stress in the anchorage region dose not increase significantly at the early loading stage. But the bond stress in the shear span decreases and the bond stress in the anchorage region is extremely higher at the later loading stage. With the increase of the applied load, arch action, instead of beam action, has achieved a dominant position in the seriously corroded reinforced concrete beam. The calculating method of the ultimate strength for the seriously corroded reinforced concrete beam was proposed based on the arch action.Keywords: seriously corroded reinforced concrete beam; load resisting mechanism; ultimate strength; bond stress; beam action; arch action*云南省級昆明理工大學人才培養(yǎng)項目（KKSY201204157）。作者簡介：董衛(wèi)，博士，講師，Email：touicn@163.com。參考文獻［1］牛荻濤, 翟彬, 王林科, 等. 銹蝕鋼筋混凝土梁的承載力分析［J］. 建筑結(jié)構(gòu), 1999, 29(8): 23-25.［2］袁迎曙, 賈福萍, 蔡躍. 銹蝕鋼筋混凝土梁的承載力分析［J］. 土木工程學報, 2001 (3): 49-54，98.［3］顏桂云, 孫炳楠, 王澤軍, 等. 銹蝕鋼筋混凝土壓彎構(gòu)件抗震性能的試驗研究［J］. 建筑結(jié)構(gòu), 2003, 33(2): 16-18，50.［4］牛荻濤, 陳新孝, 王學民. 銹蝕鋼筋混凝土壓彎構(gòu)件抗震性能試驗研究［J］. 建筑結(jié)構(gòu), 2004, 34(10): 36-45.［5］KAYSER J, NOWAK A. Capacity loss due to corrosion in steel-girder bridges［J］. ASCE, 1989, 115(6): 1525-1537.［6］孫彬, 牛荻濤, 王慶霖. 銹蝕鋼筋混凝土梁抗彎剛度分析與計算［J］. 建筑結(jié)構(gòu), 2004, 34(10): 42-45.［7］徐善華, 曾柯, 擰慷濤. 銹蝕鋼筋混凝土受彎構(gòu)件正截面承載力計算模型［J］. 建筑結(jié)構(gòu), 2006, 36(10): 79-81，97.［8］VAL D，CHERNIN L. Serviceability reliability of reinforced concrete beams with corroded reinforcement［J］. Journal of Structural Engineering, 2009, 135(8) : 896-905.［9］大即信明, 鈴木慎也. 耐久性に優(yōu)れたコンクリート構(gòu)造物—港灣構(gòu)造物［J］. 土木學會論文集, 1986, 372: 29-39.［10］苗吉軍, 李烏江, 劉延春, 等. 沿海某混凝土框架結(jié)構(gòu)鋼筋銹蝕原因分析與修復加固對策［J］. 建筑結(jié)構(gòu), 2010, 40(2): 81-83，80.［11］SCOTT R H. Intrinsic mechanisms in reinforced concrete beam-column connection behaviour［J］. ACI Structural Journal, 1996, 93(3): 336-346.［12］村上祐貴, 木下哲秀, 鈴木修一, など. 鉄筋腐食を生じたRC梁部材の殘存曲げ耐力性狀に関する研究［J］. コンクリート工學論文集, 2006, 17(1):61-74.
