精细化纤维梁柱单元模拟分析平台FENAP的开发

为精细化模拟桥梁结构的非线性行为,在深入分析纤维梁柱单元模型原理的基础上,本文基于ABAQUS建立了钢筋混凝土精细化纤维梁柱单元模拟平台FENAP,开发了与其相适应的材料模型库FENAP/MAT,涵盖了多种材料本构模型,能够有效考虑构件的刚度退化和强度退化等损伤效应,以及模拟轴力和弯矩的多维耦合效应等复杂非线性动力行为,且可考虑箍筋对混凝土的约束作用等。利用该FENAP平台数值模拟了一个钢筋混凝土矩形截面悬臂梁,进行了Pushover分析,考虑了箍筋对核心混凝土约束效应的影响,并与OpenSEES的计算结果进行对比。结果表明:FENAP平台可有效模拟桥梁构件的多种复杂非线性行为,且具有很好的计算效率和求解精度。

Development of Fiber Beam-Column Element Numerical Analysis Platform FENAP

To analyze nonlinear hysteretic behavior of structure, the principle of fiber model is discussed and reinforced concrete elaborate fiber beam-column element numerical analysis platform (FENAP) is constructed which is based on ABAQUS. The proposed FENAP platform contains several uni-axial material models, it is capable of analyzing hysteretic behavior of RC structure or members including damage effects of degradation of stiffness and strength or coupling of moment and axial force precisely. The effect of concrete confinement by stirrups is also considered carefully. Hysteretic cyclic behavior of a RC rectangular cantilever beam considering confined concrete effect are modeled and analyzed respectively using FENAP and Opensees method. The results from comparison show that FENAP could accurately simulate complicated nonlinear behavior of bridge members, and it has a good efficiency and precision, The proposed FENAP provides a better practical and convenient analysis method of bridge collapse process in the future.