改进的Park-Ang再生混凝土柱地震破坏模型的试验研究

Experimental Study of Seismic Damage Model for Improved Park-Ang RAC Columns

通过对不同配比的6根再生混凝土(RAC)柱进行低周反复加载试验。由于现有普通混凝土结构地震破坏损伤模型均为基于普通混凝土结构所构建的,是否适用于RAC结构的地震损伤破坏计算仍不明确;为能够有效考虑RAC中再生骨料取代率及混杂纤维掺量等因素所造成的普通混凝土结构地震破坏损伤模型中循环荷载系数β的不确定性及其对损伤指数计算结果的影响,同时提高计算模型的预见性与可靠性,本文提出了一种适用于RAC结构的改进的双参数损伤模型。通过模型的计算结果与实际结构各震害破损度Dc的对比,确定了适用于RAC结构的双参数损伤模型中循环荷载系数β的值。

Low-cyclic loading tests for six recycled aggregate concrete （RAC） columns with different proportions were carried out. Since the existing earthquake damage models are established based on ordinary concrete structure, so its applicability for RAC structure is still not clear. In this paper, an improved two-parameter damage model for RAC structures is proposed, which effectively takes into account the cyclic loading coefficient/~ uncertainty due to recycled aggregate replacement rate, hybrid fiber content and other factors. Meanwhile, the predictability and reliability for the calculation model is improved. Comparison between the calculated results of improved model and damaged degrees Dc for actual earthquake damage structures, the cyclic loading coefficient t？ suitable for RAC columns in above mentioned improved model is finally determined.