- 摘 要
-
（遼寧省交通規(guī)劃設(shè)計院有限責(zé)任公司 公路橋梁診治技術(shù)交通運輸行業(yè)研發(fā)中心， 沈陽 110166）
［摘要］為研究部分預(yù)應(yīng)力混凝土（PPC）梁在疲勞荷載作用后的殘余性能，制作8根試驗梁（分為H1和H2組，各4根），每組選取1根作為參考梁開展靜載試驗，其余進行等幅疲勞試驗，重點分析梁體累積殘余變形和非預(yù)應(yīng)力鋼筋殘余應(yīng)變的演化規(guī)律及影響因素。試驗結(jié)果表明：所有疲勞試驗梁的破壞模式為非預(yù)應(yīng)力鋼筋的疲勞斷裂；在疲勞荷載作用下，梁體殘余變形、非預(yù)應(yīng)力鋼筋殘余應(yīng)變均呈現(xiàn)出“三階段”變化規(guī)律，其中殘余變形大小與荷載水平和配筋率密切相關(guān)，而殘余應(yīng)變受其影響并不顯著，主要受鋼筋周圍混凝土微裂縫閉合狀態(tài)及受壓區(qū)混凝土疲勞損傷程度影響較大。
［關(guān)鍵詞］部分預(yù)應(yīng)力；疲勞荷載；殘余變形；非預(yù)應(yīng)力鋼筋；殘余應(yīng)變
中圖分類號：TU378-8， U446-1文獻標識碼：A文章編號：1002-848X(2021)04-0096-05
Experimental study on the residual performance of partially prestressed concrete beams under fatigue loading
HAN Jigang
( Research and Development Center on Road and Bridge Diagnosis & Maintenance Technology Ministry of Transport，Liaoning Provincial Transportation Planning and Design Institute Co., Ltd., Shenyang 110166， China)
Abstract:An experimental study was conducted to investigate the residual performance of partially prestressed concrete (PPC) beam. Eight PPC beams were made and divided into H1 and H2 groups, each group containing one control beam under static loading and three beams under constant amplitude fatigue loading. The evolution law and its influencing factors of cumulative residual deformation of beams and residual strain of the non-prestressed reinforcement have been analyzed. The results of the study indicate that the failure modes for all of the beams fatigue testing are fatigue fracture of the non\|prestressed reinforcement；under the fatigue loading, the growth processes of residual deformation and residual strain of the non-prestressed reinforcement are characterized by three stages. The residual deformation is closely related to the load level and reinforcement ratio, but it has less effect on the residual strain. This strain is more affected by the closed state of microcracks in concrete around the reinforcement and fatigue damage degree in the concrete compressive zone.
Keywords:partially prestressed;fatigue loading;residual deformation;non-prestressed reinforcement;residual strain
*遼寧省交通廳科技計劃項目（201913）,浙江省交通廳科技計劃項目（2020039）。
作者簡介：韓基剛，博士，高級工程師，Email:hanjigang_1982@163.com。
