基于IDA方法的某不规则图书馆抗倒塌分析

Collapse resistance analysis of an irregular library based on IDA method

为研究一般不规则钢筋混凝土框架结构的抗倒塌能力和损伤屈服机制,采用SAUSAGE软件对一扭转不规则、楼板不连续、刚度突变和局部不规则的图书馆建筑进行基于IDA方法的抗倒塌分析,得到结构在不同地震强度下的倒塌概率及梁、柱的损伤情况。结果表明:结构在地震峰值加速度为220gal时倒塌概率为0,满足“大震不倒”的目标要求,当峰值加速度每增加约0.5倍时,结构倒塌概率增加20%;梁、柱在220gal地震动下损伤均较轻,随着地震强度的提高,梁、柱的损伤情况均有所增加,且柱的损伤较梁严重,说明结构尽管满足抗震性能目标的要求,但梁没有充分发挥耗能能力,在结构设计时应更加充分考虑现浇楼板、填充墙、柱的轴压比等因素对实现“强柱弱梁”破坏机制的影响。

In order to study the collapse resistance and damage yield mechanism of a general irregular reinforced concrete frame structure, which is torsion irregularity, floor discontinuity, abrupt stiffness change and local irregularity, the IDA analysis is performed by SAUSAGE software. The collapse probability of the building under different earthquake intensity and the damage of beam and column are obtained. The results show that, the collapse probability of the library is 0 when the peak seismic acceleration is 220 gal, and meets the target requirements of no collapse under strong earthquake. When the peak acceleration increases by about 0.5 times, the structure collapse probability increases by 20%, and the damage of beam and column is light under 220 gal ground motion, With the increase of earthquake intensity, the damage of beam and column increases, and column damage is more serious than beam, which shows that although the structure meets the requirement of seismic performance, the beams are not making full use of his energy dissipation capacity. In the structural design, the influence of the cast-in-place floor, infilled wall, axial compression ratio of column, and other factors on the failure mechanism of strong column and weak beam should be considered more fully.