Feasibility of Cu–Al–Mn superelastic alloy bars as reinforcement elements in concrete beams
Feasibility of Cu–Al–Mn superelastic alloy bars as reinforcement elements in concrete beams
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DOI：
10.1088/0964-1726/22/2/025025
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发表时间：
2013-01
影响因子：
4.1
通讯作者：
K. Shrestha;Y. Araki;T. Nagae;Y. Koetaka;Yusuke Suzuki;T. Omori;Y. Sutou;R. Kainuma;K. Ishida
中科院分区：
文献类型：
--
作者：
K. Shrestha;Y. Araki;T. Nagae;Y. Koetaka;Yusuke Suzuki;T. Omori;Y. Sutou;R. Kainuma;K. Ishida
对超弹性合金(SEA)筋混凝土梁的循环响应进行了试验和数值研究。研究了以恢复应变大、材料成本低、可加工性好为特征的新开发的铜铝锰钢筋作为传统钢筋的部分替代材料的可行性，以减少结构在强烈地震中和地震后的残余裂缝。对1/3比例的普通型钢混凝土、海工钢筋混凝土和先张法海工钢筋混凝土(RC)三种不同的试件进行了四点反复弯曲试验。结果表明，与型钢混凝土梁相比，海工钢筋混凝土梁具有较强的重心能力和明显的裂缝恢复能力。此外，还建立了相应的有限元模型来模拟实验观测。试验观测和有限元计算均表明，在为钢筋混凝土梁试件提供重定心和裂缝恢复能力方面，海筋优于传统钢筋。
Experimental and numerical works are reported to assess the cyclic response of concrete beams reinforced with superelastic alloy (SEA) bars. The feasibility of newly developed Cu–Al–Mn SEA bars, characterized by large recovery strain, low material cost and high machinability, is examined as partial replacements for conventional steel bars, in order to reduce residual cracks in structures during and after intense earthquakes. Four-point reverse cyclic bending tests were done on one-third scale concrete beams comprising three different types of specimens—conventional steel reinforced concrete, SEA reinforced concrete and SEA reinforced concrete (RC) with pre-tensioning. The results showed that SEA reinforced concrete beams demonstrated strong recentering capability and significant enhancement in crack recovery capacity, in comparison to steel reinforced beams. Furthermore, corresponding finite element models were generated to simulate the experimental observations. Both the experimental observations and finite element computations illustrated the superiority of SEA bars to conventional steel bars in providing RC beam specimens with recentering and crack recovery capabilities.