預(yù)應(yīng)力混凝土梁的消壓彎矩試驗方法研究
周正茂，王素娟
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周正茂，王素娟（上海同豪土木工程咨詢有限公司，上海 200092）［摘要］通過消壓彎矩可以求得預(yù)應(yīng)力混凝土梁截面下緣混凝土的有效預(yù)壓應(yīng)力、混凝土的抗拉強度、預(yù)應(yīng)力筋的有效拉力和有效拉應(yīng)力。提出通過加載至開裂并卸載再加載的方法，獲得消壓彎矩試驗值及其他相關(guān)參數(shù)，所得試驗結(jié)果與計算結(jié)果相吻合。研究表明：提出的消壓彎矩試驗方法是可行的，截面非對稱的預(yù)應(yīng)力混凝土梁在加載彎矩作用下的開裂是一個過程，可以通過應(yīng)變與加載彎矩的關(guān)系曲線推求得到初裂彎矩、全截面的開裂彎矩和消壓彎矩，通過布置連續(xù)應(yīng)變片可以找出開裂的具體位置。［關(guān)鍵詞］消壓彎矩；預(yù)應(yīng)力混凝土梁；有效預(yù)壓應(yīng)力；開裂彎矩中圖分類號：TU317-2，U446-1文獻標(biāo)識碼：A文章編號：1002-848X(2012)07-0064-04Research on the testing method for decompression moment of the pre-stressed concrete beamZhou Zhengmao, Wang Sujuan(Shanghai Tonghao Civil Engineering Consulting Co., Ltd., Shanghai 200092, China)Abstract: The effective pre-compression stress, tensile strength of bottom concrete and the effective tensile force, effective tensile stress of pre-stressed bar can be obtained from decompression moment of the pre-stressed concrete beam. A method of loading to cracking then unloading and reloading was presented to obtain the decompression moment and other relevant parameters. The experimental results agree reasonably well with the theoretical results. The investigation shows that the presented method for decompression moment is feasible, and the cracking of the pre-stressed concrete beam with asymmetric section under loading moment is a procedure. The initial cracking moment, cracking moment of the full section and the decompression moment can be obtained from the relationship of strain and loading moment. The position of cracking can be found with the help of continuously arranged strain gauge.Keywords: decompression moment; pre-stressed concrete beam; effective pre-compression stress; cracking moment作者簡介：周正茂，博士，高級工程師， Email: zm_zhou@hotmail.com。參考文獻［1］張建玲，宋玉普，劉毅. 緩粘結(jié)預(yù)應(yīng)力混凝土梁抗裂和裂縫閉合性能［J］.哈爾濱工業(yè)大學(xué)學(xué)報,2009,41(12):128-132.［2］王俊，劉立新. 折線先張全預(yù)應(yīng)力混凝土梁徐變曲率試驗研究［J］.公路交通科技,2009,26(12):39-43.［3］胡宏彬. 預(yù)制小箱梁單片梁極限承載能力臺座試驗［J］. 施工技術(shù),2008,37(S2):302-306.［4］傅傳國，李玉瑩，梁書亭. 預(yù)應(yīng)力型鋼混凝土簡支梁受彎性能試驗研究［J］.建筑結(jié)構(gòu)學(xué)報,2007,28(3):62-73.［5］彭暉，尚守平，金勇俊，等. 預(yù)應(yīng)力碳纖維板加固受彎構(gòu)件的試驗研究［J］.工程力學(xué),2008,25(5):142-151.［6］張建偉，杜修力，鄧宗才，等. 預(yù)應(yīng)力芳綸纖維布加固混凝土梁的受彎性能研究［J］.建筑結(jié)構(gòu)學(xué)報,2006,27(5):101-109.［7］吳剛，吳智深，魏洋，等. 預(yù)應(yīng)力高強鋼絲繩抗彎加固鋼筋混凝土梁的理論分析［J］.土木工程學(xué)報,2007,40(12):28-37.［8］孟履祥，陶學(xué)康，關(guān)建光，等. 芳綸纖維筋有粘結(jié)部分預(yù)應(yīng)力混凝土梁受彎性能研究［J］.土木工程學(xué)報,2006,39(3):10-18,36.［9］楊劍，方志. CFRP預(yù)應(yīng)力筋超高性能混凝土T梁的受彎性能［J］.鐵道學(xué)報,2009,31(2):94-103.［10］JTG D62—2004公路鋼筋混凝土及預(yù)應(yīng)力混凝土橋涵設(shè)計規(guī)范［S］. 北京：人民交通出版社，2004.
