UHPC加固箱梁頂板受彎性能試驗研究
[Abstract]:A method of strengthening reinforced concrete box girder roof with dense reinforced UHPC (ultra-high performance concrete) is presented in order to eliminate two kinds of diseases, such as structural bearing capacity and durability reduction caused by cracking of concrete box girder roof. In order to investigate the transverse bending behavior of the roof of the box girder under concentrated load, the local model of the roof of three full-scale box girders was tested and studied. The experimental results show that the tensile UHPC layer significantly improves the crack resistance and stiffness of the strengthened plate under negative bending moment, and the cracking strength of the strengthened plate depends on the elastic tensile property of UHPC. When the crack width is 0.2mm, the load holding level is 255.88.When the crack width is smaller than 0.27mm, the relationship between the load and the maximum crack width is approximately linear. Under the action of positive bending moment, the cracking strength of the test plate strengthened by UHPC layer depends on the tensile strength of the adhesive used to seal the crack. Because the cracks appeared earlier in the common concrete area, the positive bending moment strengthened slab showed slightly larger deflection in the early stage, but the growth speed of the deflection and crack width in the later stage was obviously lower than that of the unstrengthened slab. The compact UHPC layer provides a good waterproof performance for the box girder roof, and the strengthened layer can improve the stiffness of the positive bending moment test plate and control the crack development obviously. The failure pattern is in line with the expectation, and the failure load is in good agreement with the theoretical calculation results.
【作者單位】: 湖南大學風工程與橋梁工程湖南省重點實驗室;湖南省交通規(guī)劃勘察設(shè)計院;
【基金】:國家自然科學基金資助項目(751201208) 湖南省交通運輸廳科技進步與創(chuàng)新項目(201425)~~
【分類號】:U445.72
【參考文獻】
相關(guān)期刊論文 前5條
1 李文光;邵旭東;方恒;張哲;;鋼-UHPC組合板受彎性能的試驗研究[J];土木工程學報;2015年11期
2 尚守平;狄國偉;劉君;王草原;;噴射高性能水泥復合混凝土加固石拱橋試驗研究[J];湖南大學學報(自然科學版);2014年09期
3 卜良桃;萬長勝;尹鵬;;PVA-ECC加固RC足尺梁受彎性能試驗研究[J];湖南大學學報(自然科學版);2010年01期
4 聶建國,王寒冰,張?zhí)焐?蔡奇,秦凱;高強不銹鋼絞線網(wǎng)-滲透性聚合砂漿抗彎加固的試驗研究[J];建筑結(jié)構(gòu)學報;2005年02期
5 朱伯龍 ,吳明舜 ,張琨聯(lián);在周期荷載作用下,鋼筋混凝土構(gòu)件滯回曲線考慮裂面接觸效應(yīng)的研究[J];同濟大學學報;1980年01期
相關(guān)博士學位論文 前1條
1 卜良桃;高性能復合砂漿鋼筋網(wǎng)加固RC梁的性能研究[D];湖南大學;2006年
【共引文獻】
相關(guān)期刊論文 前7條
1 廖買利;謝東;丁偉;劉金芝;田伶;;輻射供冷空調(diào)系統(tǒng)的研究綜述[J];湖南工業(yè)大學學報;2017年02期
2 李念平;潘楚陽;黃小君;顧昭陽;蘇林;常麗娜;;基于RC簡化傳熱模型的混凝土輻射頂板傳熱及供冷能力研究[J];湖南大學學報(自然科學版);2017年03期
3 明錦;李燦;;微孔金屬輻射頂板空調(diào)冬季熱舒適性實驗研究[J];建筑熱能通風空調(diào);2016年04期
4 李念平;孫燁瑤;錢佳煒;蘇林;張絮涵;;貼附射流輻射冷頂板復合空調(diào)系統(tǒng)的性能研究[J];湖南大學學報(自然科學版);2015年11期
5 陳遠平;李燦;明錦;;金屬微孔頂板輻射空調(diào)系統(tǒng)運行測試與分析[J];建筑熱能通風空調(diào);2015年06期
6 田U,
本文編號:2344304
本文鏈接:http://sikaile.net/kejilunwen/daoluqiaoliang/2344304.html