钢筋混凝土桥墩延性影响因素理论研究

Theoretical Study of Factors Affecting Ductility of RC Piers

为研究结构设计参数对钢筋混凝土桥墩延性的影响,对矩形和圆形钢筋混凝土桥墩的全过程弯矩～曲率曲线进行分析,从理论上研究轴压比、混凝土强度、配筋率、混凝土保护层厚度等参数对桥墩延性的影响,并对2种截面桥墩的延性性能进行比较。分析结果表明:不管矩形还是圆形截面桥墩,其延性总是随轴压比增加而降低;整体增加纵向钢筋率对桥墩延性略有不利影响;保护层厚度对桥墩延性影响相对较小;相同轴压比下,桥墩延性随混凝土强度提高而降低,相同轴力下,桥墩延性随混凝土强度提高而提高;矩形墩的延性性能优于圆形墩。

To study the effect of the related structural design parameters on the ductility of reinforced concrete （RC） piers, the full-range moment-curvature curves of the piers of rectangular and circular sections were analyzed. The effect of the parameters like the axial compression ratio, concrete strength, reinforcement ratio and concrete cover thickness on the ductility of the piers was theoretically studied and the ductility performance of the piers of two kinds of the sections was compared. The results of the analysis and study demonstrate that no matter whether the piers are of the rectangular or circular sections, the ductility of the piers always decreases with the increase of the axial compression ratio, the increase of the longitudinal reinforcement ratio in integrity has slightly adverse effect on the ductility and the effect of the concrete cover thickness on the ductility is relatively little. Under the same axial compression ratio, the ductility of the piers decreases with the increase of the concrete strength, however, under the same axial force, the ductility increases with the increase of the concrete strength and the ductility perform ante of the pier of the rectangular section is superior to that of the pier of the circular section.