带肋箱板式钢结构住宅底部加强区墙体抗震性能有限元分析

FINITE ELEMENT ANALYSIS OF SEISMIC BEHAVIOR OF THE WALL AT THE BOTTOM REINFORCED AREA OF BOX-TYPE STEEL STRUCTURE RESIDENTIAL BUILDINGS WITH STIFFENING RIBS

为了深入研究带肋箱板式钢结构住宅底部加强区墙体的抗震性能，基于前期试验研究结果，对底部加强区组合钢板墙进行有限元建模。设计了32个有限元模型试件，对影响组合钢板墙混凝土面板约束效果的关键参数进行了分析，探讨了螺栓纵、横向间距，轴压比对组合钢板墙抗震性能的影响规律，分析了模型试件的破坏模式、滞回曲线、骨架曲线、耗能能力、刚度退化和各特征阶段的荷载、位移值。结果表明：厚钢板墙承载力高、后期降低明显，最终发生屈服破坏，而薄钢板墙承载力较低，但后期承载力较稳定，最终发生屈曲破坏；螺栓纵向间距越大，滞回曲线越早出现捏缩、耗能能力减弱；轴压比对墙体承载力和耗能能力影响不大。基于分析结果，给出了组合钢板墙螺栓间距和轴压比的设计建议值。

In order to study the seismic behavior of the wall of reinforced area at the bottom of box-type steel structure residential buildings with stiffening ribs, the finite element modeling of the composite steel plate wall at the bottom reinforced area was carried out on the basis of the previous test results. 32 finite element model specimens were designed, and the key parameters affecting the binding effect of the composite steel plate concrete slab were analyzed. The influence rules of the bolt longitudinal and lateral spacing and axial compression ratio on the seismic behavior of the composite steel plate wall were discussed. The failure mode, hysteresis curve, skeleton curve, energy dissipation capacity, stiffness degradation of the model specimens were analyzed, as well as the load and displacement values at various characteristic stages. The results showed that the thick steel plate wall had high bearing capacity and an obvious reduction in the later stage, and finally the yield failure occurred; the thin steel plate wall had lower bearing capacity, but the bearing capacity was stable in the later stage, and finally the buckling failure occurred. The greater the distance between longitudinal bolts was, the earlier the pinching effect of hysteretic curve appeared, the energy dissipation capacity was weakened, the axial compression ratio had little effect on the bearing capacity and energy dissipation capacity of the wall. Based on the analysis results, the recommended design values of bolt spacing and axial compression ratio of composite steel plate wall were given.