新型混合连接件双钢板混凝土夹层梁抗弯性能数值模拟

Numerical Simulation of Flexural Behavior of Double Steel Plate Concrete Sandwich Beams with New Type of Composite Connectors

对一种具有新型混合连接件的双钢板混凝土夹层梁(SCS夹层梁)的四点弯曲试验进行了数值模拟。考虑了材料和几何的非线性行为,采用实体单元对结构中的剪力钉、高强螺栓、钢面板、混凝土芯等元件建模,同时考虑剪力钉连接件、高强螺栓以及钢面板和混凝土芯之间的复杂相互作用,建立了双钢板混凝土夹层梁的三维有限元模型,并将有限元计算结果与试验梁的跨中荷载-位移曲线、破坏模式、跨中荷载-应变曲线进行对比,对三维有限元模型的准确性进行了验证。进一步探究了夹层梁的混凝土芯强度、钢面板材料特性对梁抗折性能的影响。结果表明,提升混凝土强度对梁的弹性刚度和承载能力的影响不明显;钢面板特性对梁的弹性刚度影响不大,但可显著提高梁的承载能力。

In this paper,a four-point bending test of a double steel plate concrete sandwich beam(SCS sandwich beam)with a new hybrid connector was numerically simulated.The nonlinear behavior of material and geometry were considered,and solid cells were used to model the elements of the structure such as shear nails,high-strength bolts,steel panels,and concrete cores,and the complex interactions between shear nail connectors,high-strength bolts,steel panels and concrete cores were also considered to establish a three-dimensional finite element model of the double-plate concrete sandwich beam,and the finite element calculation results were compared with the mid-span load-displacement curves of the test beam.The accuracy of the three-dimensional finite element model was verified by comparing the finite element calculation results with the mid-span load-displacement curve,damage mode,and mid-span load-strain curve of the test beam.The effects of concrete core strength and steel panel material properties of the sandwich beam on the flexural performance of the beam were further investigated.The results show that:the effect of enhancing the concrete strength on the elastic stiffness and load carrying capacity of the beam is not obvious;the steel panel properties have little effect on the elastic stiffness of the beam,but can significantly improve the load carrying capacity of the beam.