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（1 河北工業(yè)大學(xué)土木與交通學(xué)院， 天津 300401； 2 天津市華水自來水建設(shè)有限公司， 天津 300122）
［摘要］受彎狀態(tài)下植筋結(jié)構(gòu)疲勞損傷影響其失效機(jī)理的研究相比于靜載拉拔試驗(yàn)方面的研究明顯不足。通過比較3組不同植筋深度的受彎植筋梁疲勞試驗(yàn)結(jié)果，分析了疲勞與靜載試驗(yàn)現(xiàn)象的異同。疲勞試驗(yàn)采用的應(yīng)力比為0-56，試件經(jīng)200萬次循環(huán)加載后靜力加載至破壞。分析疲勞試件撓度與循環(huán)加載次數(shù)的關(guān)系，得出不同錨固深度試件的疲勞變形計(jì)算式。研究試件應(yīng)力-循環(huán)加載次數(shù)曲線，得到不同錨固深度試件經(jīng)疲勞加載后的應(yīng)力計(jì)算式。結(jié)果表明：隨植筋深度增加，疲勞加載對試件變形、應(yīng)力的不利影響在逐漸減?。黄诩虞d對植筋梁造成的損傷集中在前50萬次循環(huán)加載。與靜載試驗(yàn)相比，疲勞加載會使試件破壞形態(tài)發(fā)生改變，疲勞荷載使得植筋端頭處成為新的薄弱位置。疲勞加載時(shí)，植筋深度達(dá)到25d時(shí)鋼筋才會屈服，試件發(fā)生塑性破壞。
［關(guān)鍵詞］植筋； 疲勞損傷； 錨固深度
中圖分類號：TU375文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2018)01-0058-04
Experimental study on fatigue damage of flexural rebar-planting beams
Yan Xikang1, Liang Linxiao1, Zhang Yucong2, Wei Xinglei1, Tao Jianwei
(1 School of Civil and Transportation Engineering， Hebei University of Technology， Tianjin 300401，China; 2 Tianjin Huashui Water Supply Construction Co.， Ltd.， Tianjin 300122， China)
Abstract:The study on the failure mechanism of rebar-planting structure impacted by fatigue damage under the bending condition is obviously less than that under the static load pullout test. By comparing the fatigue test results of 3 groups of rebar-planting beams under different planting depths, the similarities and differences between fatigue and static loading tests were analyzed. The stress ratio of fatigue test was 0-56, and the specimens were subjected to static loading to failure after 2 million cycles. The relationship between the deflection of fatigue specimens and the number of cyclic loading was analyzed, and the formulas for calculating the fatigue deformation of specimens with different anchorage depths were obtained. The stress-cyclic loading frequency curve of specimens was studied, and the fatigue stress calculation formula of specimen by fatigue loading with different anchorage depths was obtained. The results show that the adverse effects of fatigue loading on the deformation and stress of the specimens decrease gradually with the increase of the depth of the rebar-planting; the damage caused by fatigue loading on the rebar-planting beams is concentrated in the first 500 thousand cycles. Compared with the static load test, the fatigue loading changes the failure mode of the specimens, and the fatigue load makes the end of the planting rebar become a new weak position. When the rebar-planting depth reaches 25d, the rebar yields and the specimen has plastic failure under fatigue loading.
Keywords:rebar-planting; fatigue damage; anchorage depth
*河北省建設(shè)科學(xué)技術(shù)研究計(jì)劃（2014-124）。
作者簡介：閻西康，博士，教授，博士生導(dǎo)師，Email:tjsyxk@163.com。
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