钢筋混凝土桥墩延性影响因素理论研究
黄
(1.新疆交通规划勘察设计研究院上海分院
峥 ,白植舟
,上海200092;2.同济大学桥梁工程系,上海200092)
摘要: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。
关键词:桥墩;曲率延性系数;结构参数;影响;理论分析
中图分类号:U443.22 文献标志码:A
Theoretical Study of Factors Affecting Ductility of RC Piers
H UANG Zheng .BAI Zhi—zhou。
(1。Shanghai Branch Office,Xinjiang Transport Planning,Survey,Design and Research Institute,Shanghai
200092,China;2.Department of Bridge Engineering,Tongji University,Shanghai 200092,China)
Abstract: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 rectangu—
lar and circular sections were analyzed.The effect of the param eters 1ike the axial com pression ra—
tio,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 see—
tions was compared. The results of the analysis and study dem onstrate 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 com pression ratio,the increase of the longitudinal reinforcem ent ra—
tio 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 sam e axial compression ratio,the ductility
of the piers decreases with the increase of the concrete strength。however,under the sam e axial
force,the ductility increases with the increase of the concrete strength and the ductility perform
ance of the pier of the rectangular section is superior to that of the pier of the circular section.
Key words:pier;curvature ductility factor;structural parameter;effect;theoretic analysis
1 前言
延性是钢筋混凝土桥墩抗震性能的一个重要指
标。自1976年唐山大地震之后,国内学者对钢筋混
凝土墩柱的延性开展了大量试验研究 。早期的
这类研究主要针对普通混凝土类型的墩柱,研究内
收稿日期:
基金项目:
作者简介:
容主要集中在滞回曲线和延性方面。随着延性较差
的高强混凝土得到越来越多的应用 ,采用该类
材料制作的钢筋混凝土构件(如梁、墩柱)的延性性
能也得到了越来越多的重视和研究。钢筋混凝土构
件的延性以曲率延性系数为重要指标。分析曲率延
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