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设计了一榀应用H型钢锚固型连接节点的屈曲约束支撑-混凝土框架(BRBCF)并进行拟静力试验研究,通过ABAQUS软件进行有限元模拟,有限元分析结果与试验结果滞回曲线饱满,吻合度良好。在此基础上,为研究轴压比和屈曲约束支撑芯材厚度对框架抗震性能的影响,分别建立轴压比为0.35~0.75的4个有限元模型和芯材截面积从1 000~6 250 mm~2的7个有限元模型。研究结果表明:轴压比对BRBCF受力影响较小,随着轴压比的提高,承载力会有轻微下降;支撑芯材截面积对框架抗震性能的影响较大,随着截面积的增加,承载力会明显提高,连接节点位置的不平衡内力明显增大,造成该区域的破坏相对严重。
The design of a buckling-restrained brace-concrete frame (BRBCF) with H-beam anchorage connection and pseudo-static test were studied. The finite element simulation was carried out by ABAQUS software. The FEA results were in good agreement with the experimental results. Degree is good. Based on this, in order to study the influence of the axial compression ratio and the buckling-restrained core thickness on the seismic performance of the frame, four finite element models with axial compression ratio of 0.35-0.75 and the cross-sectional area of the core material from 1000 to 6 250 mm ~ 2 7 finite element models. The results show that the axial compression ratio has little effect on the BRBCF stress, and the bearing capacity decreases slightly with the increase of the axial compression ratio. The cross-sectional area of the support core greatly affects the seismic performance of the frame. With the increase of cross-sectional area , The bearing capacity will be obviously increased, the unbalanced internal force at the connecting node will obviously increase, resulting in the relatively serious damage in this area.