钢筋混凝土柱Park-Ang损伤模型的尺寸效应修正
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摘要
通过18个不同截面尺寸的钢筋混凝土柱的单调和低周反复加载试验,发现基于Park-Ang损伤模型得到的损伤指标随截面尺寸的增大而降低,存在尺寸效应;构件损伤越严重,尺寸效应越明显,且位移项与能量项所表现的尺寸效应也不相同。在试验研究的基础上,提出了考虑截面尺寸影响系数的Park-Ang损伤模型修正公式。结果表明,Park-Ang损伤模型的尺寸效应修正公式能够改善预测结果与试验结果的符合程度。
The experiment results of 18 reinforced concrete columns under low cycle reversed loading and monotonic horizontal loading show that the damage index based on Park-Ang damage model decreases as section size increases,which exists size effect. The more serious the component damages,the more obvious the size effect shows,and size effects of energy and displacement are dissimilar. Then on the basis of experiment,a modified formula of Park-Ang damage model considering section size effect coefficient was proposed. The results indicate that the modified formula of size effect of the Park-Ang damage model can improve the degree of coincidence between prediction results and test results.
引文
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