無黏結預應力高性能粉煤灰混凝土橋梁疲勞損傷計算方法的研究
發布時間: 2012-09-15 11:02 查看: 1939次
高性能粉煤灰 無黏結預應力 疲勞損傷 非線性
摘要：結合洛湛線工程項目,以不同摻量的高性能粉煤灰混凝土無黏結預應力橋梁的疲勞試驗為基礎和基于結構變形的方法計算無黏結預應力筋增量,提出一種考慮鋼筋和混凝土兩種材料耦合作用的非線性疲勞損傷過程分析方法.該方法可以考慮由于組成材料損傷機制不同而造成的疲勞損傷過程中的應力重分布現象,通過分段線性的方法進行混凝土構件的非線性損傷過程分析.理論分析與試驗結果比較表明,該方法能夠較好地描述無黏結預應力混凝土梁疲勞損傷的全過程,并能給出更符合實際情況的疲勞壽命.
Abstract： Construction of the Luoyang-Zhanjiang Railway is applied in study.On the basis of the results of fatigue experiments of unbonded prestressed concrete beams with different mixture ratios of high-performance fly ash and the unbonded prestressed reinforcement increments calculated by the method of structural deformation,the nonlinear analysis method of fatigue damage processes of unbonded prestressed concrete beams is proposed,which takes into account the coupling action between concrete and reinforcement. The method covers stress redistribution in the fatigue damage process caused by different damaging mechanisms of constituent materials. The nonlinear damage process analysis of concrete members is achieved by means of piecewise linearity. Comparing theoretical analysis with experimental results,it is seen that the proposed method is able to well depict the whole fatigue damage process of unbonded prestressed concrete beams and predict the fatigue life more realistically
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