四邊簡支單向預(yù)應(yīng)力雙向配筋混凝土疊合樓板試驗(yàn)研究*
吳方伯1，鄧?yán)?,2，劉彪1，李鈞1，陳賽國3
- 摘 要
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（1 湖南大學(xué)土木工程學(xué)院，長沙 410082；2 湖南高嶺建設(shè)集團(tuán)股份有限公司，長沙 410153；3 中機(jī)國際工程設(shè)計(jì)研究院有限責(zé)任公司，長沙 410007）［摘要］對(duì)一個(gè)四邊簡支單向預(yù)應(yīng)力雙向配筋混凝土疊合樓板的大比例模型進(jìn)行了試驗(yàn)，并對(duì)其變形特征、裂縫分布、破壞形態(tài)和極限承載力等進(jìn)行了研究。試驗(yàn)研究結(jié)果表明：均布荷載-撓度曲線近似為兩折線，當(dāng)拼縫之外的裂縫(垂直預(yù)應(yīng)力方向裂縫和斜向裂縫等)出現(xiàn)時(shí)，曲線發(fā)生明顯轉(zhuǎn)折，樓板剛度迅速降低，因此，樓板的開裂荷載應(yīng)取拼縫之外的裂縫出現(xiàn)時(shí)所對(duì)應(yīng)的荷載；樓板開裂前，荷載主要由預(yù)應(yīng)力方向承擔(dān)，預(yù)應(yīng)力的存在提高了樓板的開裂荷載，但降低了樓板的延性，樓板首次開裂便出現(xiàn)了大量斜裂縫；樓板破壞時(shí)的裂縫分布和破壞形態(tài)具有典型的塑性鉸線特征。基于塑性絞線理論，推導(dǎo)了均布荷載作用下四邊簡支單向預(yù)應(yīng)力雙向配筋混凝土疊合樓板的極限承載力公式與塑性絞線形成位置，計(jì)算結(jié)果與試驗(yàn)結(jié)果吻合良好。［關(guān)鍵詞］預(yù)應(yīng)力混凝土; 疊合樓板; 試驗(yàn); 破壞模式; 塑性鉸線中圖分類號(hào)：TU378.5 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1002-848X(2014)05-0006-06Experimental study on four-sides simply supported single-direction-prestress double-direction-tendon concrete composite floorslabWu Fangbo1, Deng Libin1,2, Liu Biao1, Li Jun1, Chen Saiguo3(1 College of Civil Engineering, Hunan University, Changsha 410082, China; 2 Hunan Gaoling Construction Group Stock Limited Company, Changsha 410153, China; 3 China Machinery International Engineering Design & Research Institute Co., Ltd., Changsha 410007, China)Abstract: A large-scale model of four-sides simply supported single-direction-prestress double-direction-tendon concrete composite floorslab was tested. Deformation behavior, crack distribution, failure pattern and ultimate bearing capacity were studied. The test results are as follows.The uniform load-displacement curve is approximate a double-straight line. When cracks beyond gap (such as crack perpendicular to the prestress direction and diagonal crack, etc) appear, the curve marks significant turnaround and floorslab stiffness drops rapidly. So the cracking load of floorslab should adopt the corresponding load when cracks beyond gap appear. Before cracking, load is mainly bore by the prestress direction of floorslab. The prestress increases the cracking load of floorslab, but reduces the floorslab ductility. The floorslab appears a lot of diagonal cracks during the first time of cracking. The crack distribution and failure pattern of floorslab show typical yield-line characteristics. Based on the yield-line theory, equations for the ultimate bearing capacity formative locations for yield line of four-sides simply supported single-direction-prestress double-direction-tendon concrete composite floorslab under uniform loads were developed and the calculation results showed good agreement with the experimental data.Keywords: prestressed concrete; composite floorslab; test; failure pattern; yield-line*國家自然科學(xué)基金面上項(xiàng)目(51278179)，長沙市科技計(jì)劃項(xiàng)目（K1205229-11）。作者簡介：吳方伯，碩士，教授，博士生導(dǎo)師， Email：wfbprof@163.com。參考文獻(xiàn)［1］曾垂軍，吳方伯，劉錫軍，等. 新型疊合結(jié)構(gòu)體系的設(shè)計(jì)與施工［J］. 建筑科學(xué), 2006, 22(4): 67-71.［2］田安國. 冷軋帶肋鋼筋混凝土疊合板試驗(yàn)研究［J］. 建筑結(jié)構(gòu), 2000, 30(1): 35-37.［3］GB 50010—2010 混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范［S］. 北京: 中國建筑工業(yè)出版社, 2011.［4］GB/T 16727—2007 疊合板用預(yù)應(yīng)力混凝土底板［S］. 北京: 中國標(biāo)準(zhǔn)出版社, 2007.［5］王曉鋒. 單向預(yù)應(yīng)力雙向疊合板樓蓋試驗(yàn)研究［D］. 北京：中國建筑科學(xué)研究院, 2003.［6］胡肇滋，錢寅泉. 正交構(gòu)造異性板剛度計(jì)算的探討［J］. 土木工程學(xué)報(bào)，1987, 20(4): 49-61.［7］安海玉，賈莉，丁永君. 預(yù)應(yīng)力混凝土雙向疊合板力學(xué)性能試驗(yàn)研究及應(yīng)用［J］. 建筑結(jié)構(gòu), 2012, 42(12): 90-93.［8］吳方伯, 黃海林, 陳偉, 等. 預(yù)制帶肋薄板混凝土疊合板件受力性能試驗(yàn)研究［J］. 土木建筑與環(huán)境工程, 2011, 33(4): 7-12.［9］GB/T 50152—2012 混凝土結(jié)構(gòu)試驗(yàn)方法標(biāo)準(zhǔn)［S］. 北京: 中國建筑工業(yè)出版社, 2012.
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