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Prediction on the flexural deflection of ultra-high strength rebar reinforced ECC beams at service loads
Structures ( IF 4.1 ) Pub Date : 2021-04-30 , DOI: 10.1016/j.istruc.2021.04.050
Qiao Liao , Lingzhi Li , Bixiong Li , Jiangtao Yu

To reduce the amount of reinforcement and control crack width, ultra-high strength rebar reinforced Engineered Cementitious Composites (UHSRRE) beams are considered a promising choice. A model is developed for predicting the flexure deflection of UHSRRE beams in service stage based on internal force equilibrium and the compatibility of deformation. In this model, the bilinear stress–strain model for Engineered Cementitious Composites (ECC) and ultra-high strength rebar is adopted, and the tensile zone of UHSRRE beams is considered. The flexure tests of seven beams with different reinforcing ratios and matrix materials are carried out for verifying the proposed model. It is observed that the experimental results are basically consistent with the predicted results. This model can provide a useful tool for the calculation of deflection. Additionally, parametric analysis is conducted to analyze the influence of reinforcement bars and matrix materials on the bending deformation of UHSRRE beams. Through comparison of the results, it is found that using higher strength grade bars not only reduces the amount of reinforcement but also maintains excellent bending performance.



中文翻译:

超高强度钢筋增强ECC梁在使用载荷下的挠曲挠度预测

为了减少补强量和控制裂缝宽度,超高强度钢筋增强工程胶结复合材料(UHSRRE)梁被认为是一个有前途的选择。基于内力平衡和变形的相容性,建立了超高强度超高梁在使用阶段的挠度挠度预测模型。在该模型中,采用工程水泥复合材料(ECC)和超高强度钢筋的双线性应力-应变模型,并考虑了UHSRRE梁的拉伸区域。为了验证所提出的模型,进行了七种不同配筋率的梁和基体材料的挠曲测试。观察到实验结果与预测结果基本一致。该模型可以为挠度的计算提供有用的工具。此外,进行了参数分析,以分析钢筋和基体材料对UHSRRE梁弯曲变形的影响。通过比较结果,发现使用更高强度等级的钢筋不仅减少了钢筋数量,而且保持了出色的弯曲性能。

更新日期:2021-04-30
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