- 摘 要
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（1 河北工業(yè)大學(xué)土木工程學(xué)院， 天津 300401； 2 河北省土木工程技術(shù)研究中心， 天津 300401；3 唐山學(xué)院土木工程系， 唐山 063000）
［摘要］對5根配置600MPa鋼筋有粘結(jié)部分預(yù)應(yīng)力混凝土梁進行靜力加載試驗，對試驗梁的受彎承載力、混凝土應(yīng)變、裂縫分布及延性等進行了分析，研究了混凝土強度及非預(yù)應(yīng)力鋼筋配筋率對試驗梁抗彎性能的影響。結(jié)果表明：試驗梁達(dá)到受彎極限狀態(tài)時，盡管鋼絞線未屈服，但600MPa鋼筋可屈服，且梁的破壞仍具有一定的延性；試驗梁跨中截面混凝土應(yīng)變基本符合平截面假定，極限承載力可按照橋涵設(shè)計規(guī)范中抗彎理論公式計算；提出600MPa鋼筋在預(yù)應(yīng)力混凝土梁中抗拉強度設(shè)計值取500MPa，為600MPa鋼筋在預(yù)應(yīng)力混凝土結(jié)構(gòu)中的應(yīng)用提供參考依據(jù)。
［關(guān)鍵詞］600MPa鋼筋； 預(yù)應(yīng)力混凝土梁； 受彎承載力； 延性
中圖分類號：TU378-2文獻標(biāo)識碼：A文章編號：1002-848X(2017)06-0050-05
Study on flexural behavior of bonded partially pre-stressed concrete beams with 600MPa reinforced bars
Li Yanyan1, 2, Li Zegao1, Li Qiang3
(1 School of Civil Engineering, Hebei University of Technology, Tianjin 300401, China;
2 Civil Engineering Technology Research Center of Hebei Province, Tianjin 300401, China;
3 Department of Civil Engineering, Tangshan College, Tangshan 063000, China)
Abstract:A static loading test was conducted on five bonded partially pre-stressed concrete beams with 600MPa reinforced bars. The flexural strength, concrete strain, crack distribution and ductility of test beams were analyzed, and influences of concrete strength and the non-pre-stressed reinforcement ratio on the flexural properties of test beams were studied. The results show that although the steel strand does not yield, 600MPa reinforced bars can yield and the failure of the beams still has a certain degree of ductility when the test beam reaches the flexural ultimate state. The concrete strain of cross section of test beam basically obeys the plain section assumption and ultimate bearing capacity cab be calculated according to the theoretical flexural formula in bridge design specifications. It′s suggested that design tensile strength value of 600MPa reinforced bar in pre-stressed concrete beams is 500MPa, which provides the reference for the application of 600MPa reinforced bar in pre-stressed concrete structures.
Keywords:600MPa reinforced bar; pre-stressed concrete beam; bending capacity; ductility
*河北省高等學(xué)?？茖W(xué)技術(shù)研究重點項目（ZD2010123），河北省交通運輸廳科技計劃項目（Y-2011052），河北省交通運輸廳科技計劃項目（Y-2012041），河北省建設(shè)科學(xué)技術(shù)研究計劃（2014-123），河北省自然科學(xué)基金資助項目（E2015202035）。
作者簡介：李艷艷，博士，教授，Email: nicole_820@163.com。
