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（河北工業(yè)大學(xué)土木工程學(xué)院， 天津 300401）

［摘要］通過配置HRB600鋼筋的部分預(yù)應(yīng)力混凝土梁的疲勞試驗(yàn)，分析了部分預(yù)應(yīng)力混凝土梁經(jīng)過疲勞荷載作用后的裂縫開展、混凝土應(yīng)變、HRB600鋼筋和鋼絞線的受力性能、撓度變化特點(diǎn)等。試驗(yàn)結(jié)果表明：經(jīng)過疲勞荷載作用后進(jìn)行靜載破壞的試驗(yàn)梁較對(duì)照靜載試驗(yàn)梁，開裂更早、裂縫數(shù)量更多、變形更大。同時(shí)，HRB600鋼筋和預(yù)應(yīng)力鋼絞線的變形恢復(fù)能力較好，且能夠很好地協(xié)同工作。可知配置HRB600鋼筋的部分預(yù)應(yīng)力混凝土梁具有較好的抗疲勞性能。

［關(guān)鍵詞］HRB600鋼筋； 部分預(yù)應(yīng)力混凝土； 預(yù)應(yīng)力鋼絞線； 疲勞試驗(yàn)

中圖分類號(hào)：TU378.2文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2016)02-0008-04

Experimental study on fatigue behavior of partially prestressed concrete

beams with HRB600 steel bars

Li Qiang， Rong Xian， Li Yanyan

(School of Civil Engineering, Hebei University of Technology, Tianjian 300401, China)

Abstract:According to fatigue test of partially prestressed concrete beams with HRB600 steel bars, the changed characteristics of partially prestressed concrete beams after fatigue loading actions were analyzed including crack development, concrete strain, mechanical performance of HRB600 steel bar and prestressed steel strand, and variation characteristics of  deflection. Experimental results indicate that the number of cracks, cracking time and deformation of beams in static load test after fatigue loading actions are more, earlier and greater than that for beams only in static load test. At the same time, HRB600 steel bars and prestressed steel strands have a good ability of deformation recovery，and they can work cooperatively. Partially prestressed concrete beams with HRB600 steel bars have a good anti-fatigue performance.

Keywords:HRB600 steel bar; partially prestressed concrete; prestressed steel strand; fatigue test

*河北省高等學(xué)?？茖W(xué)技術(shù)研究重點(diǎn)項(xiàng)目（ZD2010123）,河北省交通運(yùn)輸廳科技計(jì)劃項(xiàng)目（Y-2011052）,河北省交通運(yùn)輸廳科技計(jì)劃項(xiàng)目（Y-2012041）。

作者簡介：李強(qiáng)，碩士，講師，Email:l12345q@163.com。