基于SEA的混凝土桥墩力学性能研究

Mechanical Properties of Concrete Bridge Piers Based on SEA

超弹性合金(super-elastic alloys, SEA)因其独特的超弹性性质,在土木工程结构中有着广泛的应用前景。为研究内置SEA杆的混凝土桥墩在循环荷载作用下的力学性能,利用有限元分析软件ABAQUS建立桥墩的有限元模型。通过ABAQUS内置的超弹性模型和混凝土损伤塑性模型分别定义SEA杆和混凝土的材料本构,在建模过程中引入了普通钢筋的滞回模型,对桥墩的滞回曲线、结构刚度、屈服应力、耗能能力等力学参数进行数值分析。数值分析结果表明:有限元分析可以准确地模拟高性能材料在地震作用下的受力状态,该成果可应用于高性能材料的地震分析以及相应结构的设计和改进。

Super-elastic Alloys(SEA)are widely used in civil engineering because of its special super-elastic properties.In order to research the mechanical properties of concrete pier with built-in sea bar under cyclic load,the finite element model for bridge columns was established by finite element analysis software ABAQUS.The material constitutions of SEA rods and concrete were defined respectively by the built-in super elasticity and concrete damage plastic model of ABAQUS.In the modeling process,the hysteretic model of ordinary reinforcement was introduced,and the mechanical parameters of the pier,such as hysteretic curve,structural stiffness,yield stress and energy dissipation capacity were analyzed numerically.The numerical analysis results show that the finite element analysis can accurately simulate the stress state of high-performance materials under earthquake,which can be applied to the seismic analysis of high-performance materials and the design and improvement of corresponding structures.