ECC-方钢管-再生混凝土叠合柱轴压力学性能及承载力简化计算公式

    Axial Compression Mechanical Properties of ECC-square Steel Tube-recycled Aggregate Concrete Composite Columns and Simplified Calculation Formula of Axial Compression Capacity

    • 摘要: 为了解决方钢管-再生混凝土叠合柱(square steel pipe-recycled aggregated concrete composite-columns,SP-RAC-C)耐久性以及延性差等问题,提出一种纤维混凝土(engineered cementitious composite,ECC)-方钢管-再生混凝土叠合柱(ECC-SP-RAC-C),通过数值仿真分析探究了宽厚比、材料强度和再生骨料取代率等参数对其轴压力学性能的影响规律,提出该型叠合柱的轴压承载力计算公式。结果表明:ECC-SP-RAC-C在延性、耗能和承载力等指标上均优于RAC-SP-RAC叠合柱;宽厚比越小(ECC壳越厚)则试件的延性越高,但承载力和耗能能力降低;随着钢管强度或厚度的增加,试件的承载力、耗能和延性均增加,但钢管强度越高ECC的作用越小,而钢管厚度影响反之;ECC、RAC强度的提高均增加了叠合柱的承载力和耗能能力,低强度的ECC、高强度的核心RAC展现了更好的组合效应和良好的延性;随着再生粗骨料取代率增加,叠合柱承载力下降、延性增加;叠合柱轴压承载力计算公式具有良好的适用性。

       

      Abstract: To address the issues of durability and poor ductility of square steel pipe (SP)-recycled concrete composite column (RAC-SP-RAC-C), this paper introduces an ECC-square steel tube-recycled concrete composite column (ECC-SP-RAC-C), and investigates the influence of parameters such as width-to-thickness ratio, material strength and recycled aggregate replacement rate on its axial compression mechanical properties through numerical simulation analysis. The findings indicates that the axial compressive load capacity of ECC-SP-RAC-C is calculated by the formula. The finding indicates that ECC-SP-RAC-C is better than RAC-SP-RAC composite columns in terms of ductility, energy dissipation and load carrying capacity. A smaller the width-to-thickness ratio (the thicker the ECC shell) the higher the ductility of the specimens, yet reduces load-bearing capacity and energy dissipation capacity. The increase of steel tube strength or thickness increases the bearing capacity, energy dissipation and ductility of the specimen, but the higher the steel tube strength the smaller the effect of ECC, and the opposite effect of steel tube thickness; the increase of ECC and RAC strength increases the bearing capacity and energy dissipation capacity of the composite column, and the low strength ECC and high strength core RAC exhibits a better combination effect and good ductility; the increase of recycled coarse aggregate replacement rate, the composite column The load bearing capacity decreases and ductility increases. The formula of axial compression load bearing capacity of composite columns exhibits good applicability.

       

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