全尺寸钢筋混凝土桥墩柱ABAQUS动力分析

Dynamic Analysis of a Full-Scale Bridge Reinforced Concrete Column Using ABAQUS

摘要: 本文提出两个纤维梁单元混凝土模型。模型由拉压骨架曲线和加载卸载路径组成，其中，受拉骨架曲线由弹性和线性软化两段组成；受压骨架曲线由线性弹性和随后EN 1992版欧盟混凝土规范建议公式结合KENT-PARK模型组成，其混凝土峰值压应力，对于非约束混凝土采用圆柱体抗压强度，对于约束混凝土采用KENT-PARK模型计算。加载卸载路径分别采用OpenSees的CONCRETE01和CONCRETE02模型路径。依据ABAQUS平台的用户材料接口UMAT，开发了两个适用于纤维梁单元的混凝土模型用户子程序，F1-CON和F2-CON。通过对比全尺寸振动台试验各项结果，本文开发用户子程序与模拟方法的可靠性得到验证，结果表明用户子程序能很好地反映受地震荷载作用的钢筋混凝土柱强度与刚度的退化，模型可以广泛用于精细化模拟钢筋混凝土柱及其它弯曲构件。

Abstract: Two fiber-beam-element concrete models are presented. The models are comprised of a tension/compression envelope and unload/reload path. The tension envelope contains an elastic range and a linear soft zone. The compression envelope also includes a linear elastic range followed by the formulation of Eurocode No. EN 1992 and KENT-PARK model, whose peak stress is the concrete cylinder compressive strength for the unconfined concrete and is calculated by the KENT-PARK model for the confined concrete. The unload/reload paths of OpenSees CONCRETE01 and CONCRETE02 are used. According to UMAT interface provided by ABAQUS platform, two user subroutines of concrete, F1-CON and F2-CON, are developed for fiber beam element. By means of comparison with the results of a full scale shaking table test, reliabilities of the user subroutines and modeling methods were validated. The results show that the subroutines can well reflect strength and stiffness degradation of reinforced concrete columns produced by earthquake loading. The subroutines are widely applicable to refined simulation of concrete columns or other flexural members widely.