摘要
为研究型钢混凝土十形柱与型钢混凝土十形柱框架节点在抗震性能方面的演变规律,通过13个型钢混凝土十形柱及其框架节点的反复荷载试验,揭示了型钢混凝土十形柱、十形柱平面节点、十形柱空间节点的震损机理及性能差异,深入分析了配钢形式、加载方向、剪跨比以及轴压比等关键参数对此类构件抗震性能的影响;考虑荷载加载方向对双向受剪性能的影响,提出了型钢混凝土十形柱及其节点的受剪承载力统一预测模型;采用Open SEEs零长单元并引入荷载加载角对弯曲型破坏的型钢混凝土十形柱双向压弯承载力进行了全过程受力性能模拟并证实其可行性。结果表明:型钢混凝土十形柱及其节点由平面受力转变至空间受力时,其受剪承载力和耗能能力也随之提高;十形柱的位移延性系数最大,而平面节点的位移延性系数最小。试验轴压比在0.5范围内时,提高轴压比有利于构件和节点受剪承载力及耗能能力的增长;试验轴压比小于0.3时,随着轴压比的增大,十形柱及其节点的延性随之提高,而试验轴压比大于0.3时则随之降低。型钢混凝土十形柱及其框架节点的弹性及弹塑性层间变形能力均大于规范规定的要求。基于综合性能研究成果,给出了型钢混凝土十形柱合理配钢形式的设计建议、轴压比控制原理、最不利地震作用验算方向等结构设计理念。
In order to investigate the seismic performance evolution from steel reinforced concrete(SRC) columns to their joints, thirteen cross-shaped SRC columns and the corresponding joints were tested under the cyclic reversed loading to study the seismic failure mechanism and performance difference of the specimens. The effect of steel form, loading direction, shear-span ratio and axial compression ratio on the seismic performance of cross-shaped SRC columns, planar joints and 3 D joints were deeply analyzed. The generalized prediction model of bi-directional shear carrying capacity of cross-shaped SRC columns and the corresponding joints was proposed considering the loading direction. The bi-compression-bending capacity of cross-shaped SRC columns was calculated and verified by using Zero Length Element in Open SEEs and by introducing the loading angle. The results show that when loading direction changes from 2 D to 3 D, the shear capacity and energy-dissipation capacity of cross-shaped SRC columns and the corresponding joints were enhanced accordingly. The displacement ductility coefficients in cross-shaped columns were the maximum, but those for planar joints were the minimum. When the test axial compression ratio is in the range of 0.5, the larger axial compression ratio may lead to higher shear capacity and energy-dissipating capacity of cross-shaped SRC columns and the corresponding joints. The ductility of cross-shaped SRC columns and the corresponding joints increases with the growth of axial compression ratio, when the test axial compression ratio is lower than 0.3; while the test axial compression ratio is over 0.3, the ductility of cross-shaped SRC columns and the corresponding joints decreases with the growth of axial compression ratio. The elastic and elastoplastic drifts of cross-shaped SRC columns and the corresponding joints are much larger than the requirement in Chinese Code. Finally, the design suggestion of reasonable steel form, the principle of axial compression ratio and the calculation direction of the most unfavorable earthquake action were proposed based on the comprehensive performance studies.
引文
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