X形配筋增强高强钢筋异形柱边节点抗震性能数值模拟

为研究X形配筋增强高强钢筋混凝土异形柱边节点抗震性能,采用Abaqus有限元方法分别模拟不同轴压比、梁筋直径、混凝土强度、钢筋强度试件在低周往复作用下的受力过程。对比分析各试件的承载能力、变形能力、滞回性能和刚度退化。考察各参数对X形配筋增强高强钢筋混凝土异形柱边节点抗震性能的影响。结果表明:轴压比0.28下试件滞回性能最好;梁筋直径的增加可以延缓刚度退化,承载能力、变形能力增强,但滞回性能变差;600 MPa级高强钢筋与C60强度混凝土结合的试件及HRB 500高强钢筋与C50强度混凝土结合的试件抗震性能相对较好。

Numerical Simulation on Seismic Behavior of Specially Shaped Columns Exterior Joints with High-Strength Reinforcement and X-Shaped Reinforcement

The seismic behavior of specially shaped columns exterior joints with high-strength reinforcement and X-shaped reinforcement were analyzed by abaqus finite element model through low cyclic loading experiments with various axial compression ratios, beam bar diameters, concrete strength and steel bar strength. The bearing capacity, deformability, hysteretic characteristic and rigidity degradation were also analyzed to examine the influence of various parameters on the specimen. The results show that the hysteretic characteristic with various axial compression ratio 0.28 is better; the stiffness degradation is postponed, the bearing capacity and deformability are increased and the hysteretic characteristic becomes poor when the beam bar diameter is increased; the seismic behavior of specimen is improved significantly when the 600MPa reinforcement is combined with C60 concrete or the HRB500 reinforcement is combined with C50 concrete.