后张有黏结预应力混凝土连续梁弯矩调幅分析

Moment modification analysis on bonded post-tensioned prestressed concrete continuous beam

弯矩调幅可以减小结构构件的截面积,提高工程的经济性。为研究预应力度对高受压区预应力混凝土连续梁弯矩调幅的影响,采用有限元软件对12根后张有黏结预应力混凝土连续梁进行静力分析,获得预应力度对连续梁性能的影响规律。计算预应力混凝土连续梁的弯矩调幅值,分析预应力度对弯矩调幅的影响,提出合适的预应力混凝土连续梁弯矩调幅建议值。结果表明:随着预应力度的降低,次弯矩调幅明显减小,荷载调幅增大,弯矩总调幅值呈现下降的趋势。该研究为预应力混凝土连续梁在工程中的应用提供参考依据。

This paper is focused on bending moment modification capable of reducing the cross-sectional area of structure component with an improved economy. The study working toward identifying the influence of prestressing degree on prestressed concrete continuous beams high compression zone bending moment modification is performed by a static analysis of 12 bonded post-tensioned prestressed concrete continuous beams using finite element software and an investigation into the law behind the influence of prestressing degree on continuous beam performance. The research is unique due to the calculation of the bending moment modification values of prestressed concrete continuous beams; analysis of the effects of prestressing degree of the bending moment modification; and above all,the production of appropriate recommendation values of bending moment modification of prestressed concrete continuous beams. Results show that an decrease in prestressing degree is followed by an obvious decrease in secondary bending moment modification,enabling an increase in load modification,hence a downward trend in bending moment of total amplitude values. The research may provide a reference for prestressed concrete continuous beams in engineering applications.