梁转动对屈曲约束开缝钢板剪力墙受力性能影响有限元分析

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Δ_c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Δ_c与两侧约束部件（钢筋混凝土板）所需最小厚度t_c,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。

FEA on influence of in-plane rotation of boundary beams on behavior of buckling-restrained steel plate shear wall with slits

Parametric study was accomplished by using software ABAQUS, which focused on relationship between rotational stiffness of boundary beams and initial stiffness. The buckling-restraining efficiency in terms of gap between steel plate and buckling restrainer was also studied. The analysis indicates that initial stiffness and energy-absorbing capacity are both proportional to rotational stiffness of boundary beams and inversely proportional to boundary-beams-rotation factor, defined by ratio of in-plane rotation when the wall yields to yielding drift ratio. Initial stiffness achieves 85% of that boundary beams are kept horizontal when above-mentioned factor is no more than 0.18. When it is more than 2.0, energy dissipating factor drops by 25% at least. Meanwhile, hysteretic performance and yielding load are also inversely proportional to efficiency factor of the buckling restraining, defined by ratio of gap between steel plate and buckling restrainer to the minimum thickness of buckling restrainer (using reinforced concrete panel) that required. In the case of that efficiency factor is less than 0.22, steel plate is capable of yielding before its buckling, which makes hysteretic curves plump and yielding load coincides with theoretical result. However, steel plate buckles first and yielding load is only 75% of theoretical one when efficiency factor is no more than 1.30, which also results in severe pinching problem. Finite element analysis results agree with test results well, given necessary parameters that have been studied thoroughly.