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利用有限元软件ABAQUS,研究梁转动对屈曲约束开缝钢板剪力墙受力性能的影响,并以钢板与两侧约束部件的间隙Δc为参数,针对开缝墙面外约束条件进行分析。结果表明:在其它条件不变的情况下,开缝墙初始刚度以及耗能能力均与梁转动刚度成正比,与梁转动影响系数λ(λ为开缝墙屈服时刻梁转角与屈服层间位移角的比值)成反比,当λ<0.18时,初始刚度可达到理想条件下的85%,而当λ>2.00时,能量耗散系数至少下降25%;开缝墙滞回曲线饱满程度以及屈服荷载均与面外约束缺陷因子η成反比,η为Δc与两侧约束部件(钢筋混凝土板)所需最小厚度tc,min的比值,当η<0.22时,开缝墙能够先于屈曲达到屈服,滞回曲线饱满,屈服荷载没有降低,而当η≥1.30时,开缝墙则较早发生面外屈曲,导致滞回曲线捏拢严重,屈服荷载下降25%。根据上述分析结果,由试验结果算得λ及η(分别取λ=0.40,η=0.30和λ=1.00,η=0.23),得到的有限元曲线与试验曲线吻合较好。
The finite element software ABAQUS was used to study the influence of beam rotation on the mechanical behavior of buckling-restrained steel plate shear walls. The constraint condition of the open-faced wall was analyzed based on the gap Δc between the steel and the restraining components on both sides. The results show that the initial stiffness and energy dissipation capacity of the slotted wall are all proportional to the rotational stiffness of the beam under the same conditions and the influence coefficient λ (λ is the displacement between the beam and the yielding layer at the moment of yielding of the slotted wall Angle ratio), the initial stiffness can reach 85% under ideal conditions for λ <0.18 and at least 25% for λ> 2.00; the fullness of the hysteretic curve of the slotted wall and the yield The load is inversely proportional to the out-of-plane restraint defect factor η, which is the ratio of Δc to the minimum required thickness tc, min for the restraining members (reinforced concrete slabs) on both sides. When η <0.22, , The hysteretic curve is full, and the yield load does not decrease. When η≥1.30, the open wall buckling occurs sooner than before, resulting in severe pinch-off of hysteretic curve and a 25% drop in yield load. According to the above analysis results, calculated from the test results λ and η (λ = 0.40, η = 0.30 and λ = 1.00, η = 0.23), the finite element curve obtained is in good agreement with the experimental curve.