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首页> 外文期刊>Journal of advanced concrete technology >Numerical Simulation on Shear Capacity and Post-Peak Ductility of Reinforced High-Strength Concrete Coupled with Autogenous Shrinkage
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Numerical Simulation on Shear Capacity and Post-Peak Ductility of Reinforced High-Strength Concrete Coupled with Autogenous Shrinkage

机译：配筋自收缩的高强混凝土抗剪承载力和峰后延性的数值模拟

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摘要

The shear capacity and post-peak ductility of reinforced high-strength concrete (HSC) beams, which are greatly affected by both autogenous shrinkage and a notable reduction in shear transfer along HSC crack planes, are simulated using nonlinear finite element (FE) analysis. The volumetric change caused by autogenous shrinkage is incorporated into the analysis by introducing an effective shrinkage strain related to the initial stress that develops in the reinforcement. The computed capacity, loading/unloading stiffness, crack pattern, and mode of failure replicate data obtained from systematic experiments. Approximately 50% of the plain concrete early-age shrinkage is observed to be consistent with self-induced stresses in structural concrete. The impact of autogenous shrinkage is further emphasized in assessing shear performance together with reduced crack shear transfer. Shrinkage changes the stress transfer path and may also alter the failure mode. The multi-directional fixed crack approach is verified as a reliable structural concrete model in the case of high autogenous shrinkage as well.
机译：使用非线性有限元（FE）分析模拟了受自生收缩和沿HSC裂缝平面的剪切传递显着减少影响很大的增强高强度混凝土（HSC）梁的抗剪能力和峰后延性。通过引入与钢筋中产生的初始应力相关的有效收缩应变，将自发收缩引起的体积变化纳入分析。计算出的容量，加载/卸载刚度，裂纹模式和破坏模式将复制从系统实验中获得的数据。观察到大约50％的普通混凝土早期收缩与结构混凝土中的自生应力一致。在评估剪切性能以及减少裂纹剪切传递的过程中，进一步强调了自发收缩的影响。收缩会改变应力传递路径，也可能会改变失效模式。在高自收缩率的情况下，多方向固定裂缝方法也被证明是可靠的结构混凝土模型。

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