Development of P-I diagrams for FRP strengthened RC columns
Development of P-I diagrams for FRP strengthened RC columns
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DOI：
10.1016/j.ijimpeng.2010.10.029
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发表时间：
2011-05
影响因子：
5.1
通讯作者：
A. Mutalib;H. Hao
中科院分区：
文献类型：
--
作者：
A. Mutalib;H. Hao
在这项研究中，通过数值模拟建立了FRP加固的RC柱的压力-脉冲(P-I)图，以提供FRP加固的RC柱的破坏程度与爆炸荷载之间的关系。利用LS-DYNA建立了FRP加固前后钢筋混凝土柱的数值模型。通过将数值模拟结果与文献中的试验结果进行比较，验证了模型模拟钢筋混凝土柱对爆炸荷载反应的准确性。然后利用所建立的数值模型计算了不同FRP加固措施的RC柱的动力响应和损伤。由于柱的主要设计目的是承载轴向荷载，因此利用剩余轴向承载能力来量化破坏程度。对柱尺寸、混凝土强度、配筋率、FRP厚度和FRP强度对P-I图的影响进行了参数研究。根据数值计算结果，导出了预测P-I图冲量和压力渐近线的经验公式。这些经验公式可以直接用于构建评估不同FRP加固措施的RC柱的抗爆承载能力的P-I图。
In this study, numerical simulations are performed to construct the Pressure-Impulse (P-I) diagrams for FRP strengthened RC columns to provide correlations between the damage levels of FRP strengthened RC columns and blast loadings. Numerical model of RC columns without or with FRP strengthening is developed using LS-DYNA. The accuracy of the model to simulate RC column responses to blast loads is verified by comparing the numerical simulation results with the tests results available in the literature. Dynamic response and damage of RC columns with different FRP strengthening measures are then calculated using the developed numerical model. The residual axial-load carrying capacity is utilized to quantify the damage level since the columns are primarily designed to carry the axial loads. Parametric studies are performed to examine the influence of column dimension, concrete strength, steel reinforcement ratios, FRP thickness and FRP strength on the P-I diagrams. The empirical formulae are derived based on numerical results to predict the impulse and pressure asymptote of P-I diagrams. These empirical formulae can be straightforwardly used to construct P-I diagrams for assessment of blast loading resistance capacities of RC columns with different FRP strengthening measures.