摘要
采用ABAQUS通用有限元软件对装配式方钢管约束混凝土桥墩进行建模,计算了桥墩试件荷载-位移滞回曲线与骨架曲线特征值;以轴压比、长细比、约束系数、方钢管屈服强度、混凝土强度、钢管嵌入深度与桥墩边长比、嵌套钢管直径与桥墩边长比、嵌套钢管厚度与桥墩边长比为拓展参数,研究各参数对装配式方钢管约束混凝土桥墩荷载-位移骨架曲线的影响规律;借鉴钢管约束钢筋混凝土柱的计算框架,拟合得出装配式方钢管约束混凝土桥墩各特征值(弹性刚度、水平荷载峰值、峰值荷载位移与下降段刚度)的计算公式;该计算公式与有限元分析结果吻合良好,有限元分析值与公式计算值之比的平均值为1.004~1.035,均方差为0.133~0.162;选取实际工程对算法进行实例验证,计算结果与有限元数值吻合良好。
The ABAQUS general finite element software is used to model concrete bridge piers constrained by assembled square steel tubes and calculate the load-displacement hysteresis curve and skeleton curve characteristics of the bridge piers.Axial compression ratio,slenderness ratio,confinement coefficient,yield strength of square steel tube,concrete strength,ratio of embedded depth of steel tube to side length of pier,and ratio of diameter of nested steel tube to side length of pier,and ratio of thickness of nested steel tube to side length of pier are taken as extended parameters.The influences of various parameters on the load-displacement skeleton curve of the concrete bridge piers confined by assembled square steel tubes are studied.Referring to the calculation framework of steel tube confined reinforced concrete column,the calculation formula of each characteristic value(elastic stiffness,horizontal load peak,peak load displacement and descending segment stiffness)of concrete piers confined by prefabricated square steel tubes is fitted.The calculation formula is in good agreement with the results of finite element analysis.The average value of the ratio between the finite element analysis value and the calculated value of the formula is 1.004~1.035,and the mean square error is 0.133~0.162.The actual project is selected to verify the algorithm.The calculation results are in good agreement with the finite element value.
作者
欧智菁
曹磊
林上顺
薛文浩
陈治雄
OU Zhijing;CAO Lei;LIN Shangshun;XUE Wenhao;CHEN Zhixiong(Fujian Provincial Key Laboratory of Advanced Technology and Informatization in Civil Engineering,Fujian University of Technology,350118 Fuzhou,China;Fujian Rongsheng Municipal Engineering Co.,Ltd.,350011 Fuzhou,China)
出处
《应用力学学报》
CAS
CSCD
北大核心
2024年第3期612-620,共9页
Chinese Journal of Applied Mechanics
基金
国家自然科学基金资助项目(No.514083128)
福建省自然科学基金资助项目(No.201701471)
福建省交通运输科技资助项目(No.202003)。
关键词
装配式混凝土桥墩
方钢管约束
特征值
骨架曲线
恢复力模型
prefabricated concrete pier
square steel tube confined
eigenvalue
skeleton curve
restoring force model
