Seismic Performance of Post-tensioned Precast Concrete Joints Improved with Curved Steel Braces
Seismic Performance of Post-tensioned Precast Concrete Joints Improved with Curved Steel Braces
复制标题
弯钢支撑改善后张法预制混凝土节点抗震性能
DOI：
10.1080/13632469.2020.1724213
复制
发表时间：
2020-02
影响因子：
2.6
通讯作者：
Yan Weiming
中科院分区：
文献类型：
--
作者：
Chen Shicai;Zheng Luyao;Yan Weiming
摘要由预制混凝土梁和柱组成的无粘结后张预应力框架结构已被提出用于多层建筑。然而，其较低的结构强度和刚度限制了其系统在地震多发地区的适用性。为改善后张法预制钢筋混凝土（RC）梁柱节点的结构性能，提出了在节点中设置曲线钢支撑的方案，对沿着4个不同截面高度和偏心距的曲线钢支撑节点试件进行了低周反复荷载试验，并利用有限元模型进行了参数分析。分析了其破坏形态、强度、刚度和耗能能力。分析结果表明，节点整体受力性能稳定，层间位移角为5%，破坏模式为梁端混凝土破碎，曲撑弯曲屈服。曲线钢支撑可以为预制节点提供良好的强度、刚度和耗能能力，并且随着支撑截面高度的增大和支撑偏心距的减小，节点的这些性能逐渐增强。层间位移角为4%时，节点的等效粘滞阻尼系数为0.12 ~ 0.2，比普通后张预制节点高2 ~ 3倍。当曲线钢支撑偏心距小于0.3时，节点强度受偏心距影响较大，当偏心距大于0.3时，节点强度变化不大。分析结果表明，后张预应力曲线钢支撑框架结构在实际工程中是可行的。
ABSTRACT The moment frames that consisted of prefabricated concrete beams and columns, which were linked by the unbonded post-tensioning, have been proposed for multi-story buildings. However, their lower structural strength and stiffness limited the applicability of their systems in the earthquake-prone areas. Curved steel braces were proposed in this study to improve the structural performance of the post-tensioned precast reinforced concrete (RC) beam-column joints, along with four joint specimens consisting of braces with different cross section height and eccentricity were tested under the reversed cyclic loads while the parametric analysis was also carried out using the finite element analysis (FEA) model. Also, the failure mode, strength, stiffness, and energy dissipation were analyzed. Based on the results, the whole joints have a stable mechanical behavior with an inter-story displacement angle of 5%, concrete crushing at the end of the beam, and a bending yield of curved braces form the failure mode. The curved steel braces could provide good strength, stiffness, and energy dissipation for the precast joints and these features of the joints could gradually increase with the expansion of the brace section height and the reduction of the brace eccentricity. The equivalent viscous damping coefficient at 4% inter-story displacement angle ranged from 0.12 to 0.2, which was two to three times higher than the general post-tensioned precast RC joints. When the eccentricity of the curved steel brace was less than 0.3, the joint strength was greatly impacted by the eccentricity and changed a bit when it was greater than 0.3. The results showed the practical feasibility of the post-tensioned frames with curved steel braces.
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DOI：
10.1061/(asce)st.1943-541x.0000415
发表时间：
2012-02
期刊：
Journal of Structural Engineering-asce
影响因子：
--
作者：
B. Weldon;Y. Kurama
通讯作者：
B. Weldon;Y. Kurama
影响因子：
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影响因子：
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DOI：
10.1061/(asce)st.1943-541x.0000212
发表时间：
2010-09
期刊：
Journal of Structural Engineering-asce
影响因子：
--
作者：
B. Weldon;Y. Kurama
通讯作者：
B. Weldon;Y. Kurama
影响因子：
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通讯作者：
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