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（1 昆明理工大學(xué), 昆明 650500； 2 國立長岡工業(yè)高等專門學(xué)校, 新潟 9408532； 3 中央大學(xué),東京 1128551； 4 東電設(shè)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(jìn)行了具有不同銹蝕率和不同剪跨比的銹蝕無腹筋鋼筋混凝土梁的四點受彎加載試驗。試驗中，以人工和電化加速銹蝕兩種方法除去支座間鋼筋和混凝土之間的粘結(jié)應(yīng)力。通過銹蝕無腹筋鋼筋混凝土梁的縱筋應(yīng)變分布，計算各加載水平下的縱筋與混凝土之間的粘結(jié)應(yīng)力分布。試驗表明，剪跨比較小的銹蝕無腹筋鋼筋混凝土梁中的拱效應(yīng)較強(qiáng)，剪跨比較大的拱效應(yīng)較弱；加載后期階段，錨固區(qū)域的平均粘結(jié)應(yīng)力顯著增大，當(dāng)錨固區(qū)域的粘結(jié)性能不能維持拱肋的平衡時，銹蝕無腹筋鋼筋混凝土梁即發(fā)生破壞。對于承載機(jī)理為拱效應(yīng)的銹蝕無腹筋鋼筋混凝土梁，剪跨比和錨固區(qū)域的粘結(jié)性能是影響其極限承載力的重要因素。根據(jù)試驗結(jié)果，擬合出了極限承載力與兩因素之間的關(guān)系，且具有良好的適用性。

［關(guān)鍵詞］極限承載力； 承載機(jī)理； 拱效應(yīng)； 剪跨比

中圖分類號：TU3751     文獻(xiàn)標(biāo)識碼：A       文章編號：1002-848X(2015)02-0041-06

Calculation method for the ultimate bearing capacity of corroded reinforced concrete beam without web reinforcement based on the arch effect bearing mechanism

Dong 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,ata 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 corroded reinforced concrete beams without web reinforcement were carried out under displacement control with different corrosion ratio and spantodepth ratio. In the experiment, the bond stress between the main rebar and the concrete in supporting was removed by two kinds of methods of artificial and electrochemical accelerated corrosion.   The bond stress distribution between longitudinal bars and concrete under various loading levels was calculated by the strain distribution of the longitudinal reinforcement in corroded reinforced concrete beams without web reinforcement was studied. Experiments show that corroded reinforced concrete beams without web reinforcement with the small spantodepth ratio have strong arch effects, while the arch effect is weak if the spantodepth ratio is large. In the late stage of loading, the average bond stress increases significantly in anchorage zone. When the bond performance of anchorage zone  can not maintain balance of arch rib, corroded reinforced concrete beam without web reinforcement is destroyed. For the corroded reinforced concrete beams without web reinforcement with bearing mechanism of the arch effect, spantodepth ratio and performance of anchorage zone are important factors affecting the ultimate bearing capacity. According to the test results, the relationship between the ultimate bearing capacity and the two factors is fitted, which has good applicability.

Keywords:ultimate bearing capacity; bearing mechanism; arch effect; spantodepth ratio

*云南省級人才培養(yǎng)項目（KKSY201204157）。

作者簡介：董衛(wèi)，博士，講師，Email：touicn@163.com。

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