摘要
为系统研究多参数组合对圆形钢筋混凝土桥墩延性抗震性能的影响,建立较可靠的数值分析模型,开展了以墩高(剪跨比)、纵筋率、轴压比、配箍率为因素的四因素三水平圆形钢筋混凝土桥墩拟静力弯曲破坏正交试验,并基于OpenSees纤维模型及等效塑性铰模型对试验桥墩的骨架曲线、滞回性能进行数值分析。结果表明:试验桥墩位移延性为5.3~8.4,等效粘滞阻尼比为0.19~0.29,具有良好的抗震性能;在置信度为0.1的水平下,墩高、纵筋率对极限位移有显著影响,剪跨比、纵筋率对最大侧荷载有显著影响,纵筋率对累计耗能有显著影响,剪跨比、轴压比对等效屈服弯曲刚度有显著影响,且除剪跨比与最大侧向荷载呈负相关关系外,其余均呈正相关关系;数值分析结果与试验结果吻合良好,基于等效塑性铰模型的截面层次及构件层次的数值模拟均可作为钢筋混凝土桥墩抗震性能评估的有效方法。
In order to systematically study the influence of multi-parameter combinations on the seismic performance and establish a reliable numerical analysis model of circular reinforced concrete piers,a quasi-static orthogonal test of four-factors and three-level for circular reinforced concrete bridge piers has been carried with pier height(shear span ratio),longitudinal reinforcement ratio,axial compression ratio and stirrup ratio as factors.Then the skeleton curve and hysteretic behavior of specimens were simulated with fiber model and equivalent plastic hinge model using OpenSees platform.The results show that all test piers have good seismic performance,the displacement ductility is between 5.3 and 8.4,and the equivalent viscous damping ratio is between 0.19 and 0.29.At the level of confidence of 0.1,the pier height and longitudinal reinforcement ratio have a greater influence on the ultimate displacement,the aspect ratio and longitudinal reinforcement ratio have a significant effect on the maximum lateral load,the longitudinal reinforcement ratio has a significant impact on the cumulative energy,the aspect ratio and axial load ratio have a greater impact on the equivalent stiffness,and the aspect ratio is negatively correlated with the maximum lateral load,the rest are all positively correlated.The force-displacement relationship curves of bridge piers derived from the fiber element model agree well with experimental results.Both numerical simulation of the section-level and component-level based on equivalent plastic hinge model can be used as an effective method to evaluate the seismic performance of reinforced concrete bridge piers.
作者
李贵乾
唐光武
郑罡
LI Guiqian;TANG Guangwu;ZHENG Gang(Guangxi Vocational and Technical College of Communications, Nanning 530216, P. R. China;State Key Laboratory of Bridge Structural Dynamics, China Merchants Chongqing Communications Technology Research & Design Institute Co., Ltd., Chongqing 400067, P. R. China;School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, P. R. China)
出处
《土木与环境工程学报（中英文）》
CSCD
北大核心
2022年第4期113-123,共11页
Journal of Civil and Environmental Engineering
基金
国家自然科学基金(51978112)。
关键词
桥墩
抗震性能
拟静力试验
正交试验
等效塑性铰模型
数值模拟
bridge piers
seismic performance
quasi-static test
orthogonal test
equivalent plastic hinge model
numerical simulation
