Abstract This paper presents an experimental and analytical study examining the blast load performance of steel reinforced (RC) concrete columns retrofitted with externally bonded carbon fiber reinforced polymer (CFRP) sheets. As part of the experimental program, twelve columns reinforced with different thicknesses and strengthening methods of CFRP sheets were tested under close-in explosions. The performances of the columns are compared to a control set of specimens without CFRP reinforcement. The results demonstrate that the use of CFRP significantly improves the blast performance of RC columns by reducing the maximum and residual displacements, enhancing the damage tolerance and eliminating secondary blast fragments. The results also indicate that increasing the thickness of the CFRP sheet can improve the ductility of a column. However, CFRP reinforcement on both the compressive and tensile faces can affect the failure mode of the columns. As part of the analytical study, the response of the test columns is predicted using an improved nonlinear single-degree-of-freedom (SDOF) analysis method and finite element modeling. Parametric studies were also performed to investigate the effects of the CFRP sheet thickness, bond strength, anchorage system, axial load and strengthening method on the blast performance of RC columns retrofitted with CFRP sheets.

中文翻译：

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CFRP加固钢筋混凝土柱在近爆载荷作用下的试验与数值分析

摘要 本文提出了一项试验和分析研究，研究了用外部粘合碳纤维增强聚合物 (CFRP) 板改装的钢筋 (RC) 混凝土柱的爆炸荷载性能。作为实验计划的一部分，在近距离爆炸下测试了 12 根不同厚度的加固柱和 CFRP 板的加固方法。将柱的性能与没有 CFRP 加固的一组控制试样进行比较。结果表明，CFRP 的使用通过减少最大位移和残余位移、提高损伤容限和消除二次爆炸碎片，显着提高了 RC 柱的爆破性能。结果还表明，增加 CFRP 板的厚度可以提高柱的延展性。然而，受压面和受拉面的 CFRP 钢筋都会影响柱的破坏模式。作为分析研究的一部分，使用改进的非线性单自由度 (SDOF) 分析方法和有限元建模来预测测试柱的响应。还进行了参数研究，以研究 CFRP 板厚度、粘结强度、锚固系统、轴向载荷和加固方法对用 CFRP 板改造的 RC 柱的爆破性能的影响。