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張志國¹ ,  李浩然^{1 ,2} ,  潘冀蒙¹  ,  郭文濤¹  ,  蘇靖海³

( 1 .  石家莊鐵道大學 土木工程學院 ，石家莊 050043 ;  2.  山西建筑工程集團有限公司 ，太原 030000 ;

3 .  石家莊市住建集團建筑工程檢測服務有限公司 ，石家莊 050000)

摘   要 ：雙摻細粉料摻加到預應力混凝土在橋梁的應用較為廣泛，但對其力學性能存在一些疑慮。基于相 似理論，制作縮尺比例 1 ∶5 的模型梁，混凝土強度等級為 C50 ,   以 5 Hz 頻率的半正弦波恒定應力加載，進行 200 萬次疲勞加載循環(huán)，分析不同摻量雙摻細粉料模型梁的彎曲疲勞性能。結果表明，在 200 萬次疲勞加載后模型 梁沒有疲勞裂縫，疲勞性能穩(wěn)定，疲勞試驗后破壞試驗強度沒有明顯的降低，疲勞后靜力受力性能穩(wěn)定，摻加 細粉料對混凝土梁有明顯的改善作用。其中，在 20 萬次循環(huán)以下，雙摻細粉料混凝土梁的應變迅速增加，彎曲 剛度迅速減小；超過 20 萬次循環(huán)后，應變增加的速度和彎曲剛度減小的速度顯著減慢。綜合分析表明，所有雙 摻細粉料混凝土梁都表現出良好的彎曲疲勞性能，值得在工程中推廣。

關鍵詞：高性能混凝土 ；疲勞性能 ；等幅疲勞試驗

中圖分類號：U24           

文獻標志碼：A           

文章編號： 1005- 8249   (2025)  01- 0119- 06 

DOI:10. 19860/j.cnki.issn1005 - 8249.2025 .01 .022

 

ZHANG Zhiguo¹  ,  LI Haoran^{1 , 2}  ,  PAN Jimeng¹  ,   GUO Wentao1 ,  SU Jinghai3

( 1 . Shool of Civil Engineering ,   Shijiazhuang Tiedao University ,   Shijiazhuang 050043 ,   China;

2. Shanxi Construction Engineering Group Co. ，Ltd. ，Taiyuan 030000 ,  China;  3 . Shijiazhuang City

Construction Group Constructional Engineering Testing Service Co. ，Ltd. ，Shijiazhuang 050000 ,   China)

Abstract: Double-mixed fine powder admixture to prestressed concrete is more widely used in bridges, but there are some doubts about its mechanical properties. Based on the similarity theory, a scaled-down model girder of 1:5 was made, and the concrete strength grade was C50, loaded with a half-sine wave constant stress at a frequency of 5 Hz, and 2 million fatigue loading cycles were carried out, to analyze the bending fatigue performance of the model girder with double-doped fine powder. The results show that there is no fatigue crack in the model beam after 2 million fatigue loading cycles, the fatigue performance is stable, the destructive test strength does not decrease significantly after the fatigue test, the static stress performance is stable after fatigue, and the doping of fine powder has an obvious improvement effect on the concrete beam. Among them, below 200,000 cycles, the strain of double-doped fine powder concrete beams increased rapidly, and the bending stiffness decreased rapidly. After more than 200,000 cycles, the rate of strain increases, and the rate of bending stiffness reduction slows down significantly. Comprehensive analyses show that all double-mixed fine powder concrete beams exhibit good flexural fatigue performance, which is worth promoting in engineering.

Key words: high performance concrete beam; fatigue performance; constant amplitude fatigue test

基金項目：河北省交通運輸廳重點項目  (Y- 2010024) 。

作者簡介： 張志國  (1971 —) ,  男，博士，教授，研究方向：橋梁與結構工程。

通信作者：蘇靖海  (1987—) ,  男，碩士研究生，高級工程師 ，研究方向： 結構工程。

收稿日期：2024 - 04 - 08