焊接应力对开洞钢板剪力墙极限承载力的影响

Influence of Welding Stress on the Ultimate Bearing Capacity of Steel Plane Shearing Wall(SPSW)with Opening

钢板剪力墙在施工过程中,为保证安装精度及避免受力后产生的噪声问题,多选用焊接连接的方式,这将导致内填板存在较大的焊接应力与变形。通过建立精细有限元模型,研究了焊接对钢板墙受力性能的影响。计算结果表明焊接应力与焊接变形在设计中不可忽略。首先,以开边洞钢板墙为例具体分析了施焊顺序的影响。在得到最佳施焊方案后对有、无焊接作用下开边洞钢板墙进行比较发现,考虑焊接影响时钢板墙的极限抗剪承载力与结构延性均有所降低。最后通过分析开边洞钢板墙的滞回曲线与能量耗散系数指出,钢板墙在进入弹塑性阶段后具有较好的耗能能力。

Welding is a common method during the construction of steel plane shear wall （SPSW） to ensure fixing precision and avoid the noise after loading. Meanwhile, welding leads to large stress and distortion in filling plates. The authors build exquisite finite element models to study the welding effects on the behavior of SPSW. It indicates that the welding stress and welding distortion can not be omitted in design. Firstly, taking for SPSW with opening as example, the influence of different welding sequences is analyzed and compared to obtain the optimum one. By comparing SPSW with opening and that without, it is found that the ultimate bearing capacity and ductility of the former decrease. Then with the analysis of the hysteretic curve and coefficient of energy expenditure, it shows that SPSW with opening has excellent energy dissipation ability after entering elasto-plastic stage.