摘要
为改善圆形截面RC桥墩的抗震、抗撞击设计,以工程中常用的圆柱式桥墩为例,考虑不同轴压比、配筋率和混凝土等级等因素的影响,采用纤维模型对桥墩极限承载力和延性变化规律进行研究。结果表明:轴压比、纵向配筋率、混凝土等级对结构极限承载力的影响单调递增,而当轴压比为0.6、横向配筋率为0.06%时截面延性最佳;截面延性随着混凝土强度增加而降低;纵筋配筋率恒定时,截面的极限弯矩和延性不受纵筋直径变化的影响。
Taking cylindrical piers as an example, the ultimate bearing capacity and ductility changing law of bridge pier with different axial compression ratio, reinforcement rate and concrete grade are analyzed using fiber model method to improve the seismic and anti-impact design of reinforced concrete bridge piers with circular cross section. As the results of the analysis indicates, axial compression ratio, longitudinal reinforcement ratio and concrete grade have monotone increasing influence on ultimate bearing capacity of structure, and when the axial compression ratio is 0.6 and transverse reinforcement ratio is 0.06%, the section ductility is optimal; section ductility reduces with the increases of concrete strength ; the ultimate bending moment and section ductility are not affected by the diameter of the longitudinal bars.
出处
《现代交通技术》
2017年第3期39-43,71,共6页
Modern Transportation Technology
关键词
桥墩
圆形截面
纤维模型
极限承载力
延性
bridge piers
circular section
fiber model
ultimate bearing capacity
ductility