底板厚度对U型预制ECC-RAC组合梁抗弯性能影响分析

Effect of Base Plate Thickness on Flexural Performance of U-Shaped Prefabricated ECC-RAC Composite Beams

摘要: 为了改善再生混凝土构件在延性和能量耗散方面的不足，本文引入U型预制ECC-RAC组合梁作为优化方案，并借助ABAQUS有限元平台建立数值仿真分析模型并基于已有试验结果验证。在此基础上，探究了底板厚度对组合梁峰值荷载、延性表现和耗能能力的影响规律。结果显示，底板适当加厚有助于提高承载性能、延性性能和能量耗散能力。此外，与同等条件下的纯RAC梁及纯ECC梁相比，组合梁在整体性能上展现出更优的综合表现。相关分析为该类新型组合构件的低碳化设计及工程推广提供了参考依据。

Abstract: To mitigate the ductility limitations and energy dissipation deficiencies in recycled aggregate concrete (RAC) structural systems, this research introduces a novel U-shaped prefabricated composite beam configuration integrating engineered cementitious composites (ECC) with RAC. A finite element model was developed and validated through the ABAQUS platform, benchmarked against experimental datasets. Parametric analysis was conducted to evaluate the effects of base plate thickness variations on three critical mechanical properties: ultimate load capacity, deformation ductility, and energy absorption efficiency. The findings demonstrate that strategic dimensional optimization of the base plate significantly improves structural bearing capacity while concurrently enhancing both ductility indices and energy dissipation performance. Comparative assessments against conventional RAC monolithic beams and ECC-only specimens under identical loading regimes confirm the hybrid system’s enhanced multifunctional performance. This work establishes technical guidelines for sustainable engineering practices and supports the development of low-carbon composite structures in civil infrastructure applications.