论文部分内容阅读
基于响应面法对预应力混凝土桥墩延性能力展开研究。主要分析了纵向钢筋配筋率、箍筋配筋率、预应力钢束的数量和混凝土强度对预应力混凝土桥墩曲率延性系数的影响。参考以往的混凝土桥墩的设计参数,采用Box-Behnken试验设计法,利用数值分析,计算25个预应力混凝土桥墩的延性系数,通过响应面法得到延性系数的回归方程。从计算结果可以看出:预应力钢束的数量对桥墩延性系数影响显著,随着预应力钢束数量的增加,桥墩延性系数曲线减小;随着箍筋配筋率和混凝土强度提高,桥墩延性系数线性增加;随着纵向钢筋配筋率提高,桥墩延性系数略有增加。
Research on Ductility of Prestressed Concrete Pier Based on Response Surface Methodology. The effects of longitudinal reinforcement ratio, stirrup reinforcement ratio, the number of prestressed steel strands and concrete strength on the ductility coefficient of curving of prestressed concrete piers are mainly analyzed. With reference to the design parameters of the concrete piers, the Box-Behnken test design method was adopted. The ductility coefficients of 25 prestressed concrete piers were calculated by numerical analysis. The regression equation of ductility coefficient was obtained by response surface method. It can be seen from the calculation results that the number of prestressing steel strands has a significant effect on the ductility coefficient of bridge piers. With the increase of prestressing steel strands, the ductility coefficient curve of bridge pier decreases. With the increase of the ratio of hoop reinforcement and concrete strength, The ductility coefficient increases linearly; as the longitudinal reinforcement ratio increases, the ductility coefficient of the pier slightly increases.