Hysteretic performance of RC double-column bridge piers with self-centering buckling-restrained braces
Hysteretic performance of RC double-column bridge piers with self-centering buckling-restrained braces
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自定心屈曲约束支撑RC双柱桥墩的滞回性能
DOI：
10.1007/s10518-019-00586-4
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发表时间：
2019-06-01
影响因子：
4.6
通讯作者：
Hao, Hong
中科院分区：
文献类型：
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作者：
Dong, Huihui;Du, Xiuli;Hao, Hong
桥梁是生命线结构。强震后桥梁结构的残余位移较大，严重影响了震后救援工作的开展。为了减小桥墩的残余变形，在钢筋混凝土（RC）双柱桥墩上安装了由自定心（SC）构件和传统防屈曲支撑（BRB）组成的自定心防屈曲支撑（SC-BRB）。首先对SC-BRB的滞回性能进行了试验研究，并与传统BRB和自定心支撑（SCB）的滞回性能进行了比较。然后，将SC-BRB、BRB和SCB安装到RC双柱桥墩上，并进行大比例拟静力循环加载试验，以评估这些桥墩的滞回性能。为了比较，还对无支撑桥墩进行了试验。系统地分析比较了有、无支撑桥墩的损伤形态、滞回响应、残余位移和耗能能力。试验结果表明，SC-BRB在提高桥柱强度和减小残余变形方面具有明显的优势。最后，为了便于使用，建立了一个简化的滞回恢复力模型，用于评价SC-BRB桥墩的滞回性能。分析结果与实验数据的对比验证了分析模型的准确性。
Bridges are lifeline structures. The large residual displacement of a bridge structure after a severe earthquake can significantly impede the post-quake rescue activities. The self-centering buckling-restrained brace (SC-BRB) consisting of a self-centering (SC) component and a traditional buckling-restrained brace (BRB) is installed on the reinforced concrete (RC) double-column bridge piers to minimize the residual deformation of the bridge pier in the present study. The hysteretic behavior of the SC-BRB is experimentally investigated firstly, and compared with those of a traditional BRB and a self-centering brace (SCB). SC-BRB, BRB and SCB are then installed onto the RC double-column bridge piers, and large-scale quasi-static cyclic loading tests are performed to evaluate the hysteretic performances of these bridge piers. For comparison, the bridge pier without any brace is also tested. The damage patterns, hysteretic responses, residual displacements and energy dissipation capacities of the piers without and with different braces are analyzed and compared systematically. Experimental results demonstrate the obvious advantages of SC-BRB in increasing the strength and minimizing the residual deformation of the bridge column. Finally, a simplified hysteretic restoring force model for evaluating the hysteretic behavior of the pier with SC-BRB is developed for easy use. The comparisons between the analytical results and experimental data demonstrate the accuracy of the analytical model.