Numerical Simulation on Shear Capacity and Post-Peak Ductility of Reinforced High-Strength Concrete Coupled with Autogenous Shrinkage
Numerical Simulation on Shear Capacity and Post-Peak Ductility of Reinforced High-Strength Concrete Coupled with Autogenous Shrinkage
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DOI：
10.3151/jact.9.73
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发表时间：
2011-02
影响因子：
2
通讯作者：
Esayas Gebreyouhannes;K. Maekawa
中科院分区：
文献类型：
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作者：
Esayas Gebreyouhannes;K. Maekawa
采用非线性有限元方法对钢筋高强混凝土梁的抗剪承载力和峰后延性进行了数值模拟，结果表明，高强混凝土梁的抗剪承载力和峰后延性受自收缩和沿高强混凝土裂纹面剪切传递显著降低的影响较大。通过引入与钢筋中产生的初始应力相关的有效收缩应变，将自收缩引起的体积变化合并到分析中。计算的承载力、加载/卸载刚度、裂纹模式和破坏模式复制了从系统实验中获得的数据。约50%的素混凝土早期收缩与结构混凝土中的自诱发应力一致。在评估剪切性能时，进一步强调了自收缩的影响，同时减少了裂缝的剪切转移。收缩改变了应力传递路径，也可能改变失效模式。验证了多向固裂方法在大自收缩情况下是一种可靠的结构混凝土模型。
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.