材料科学
剪切(地质)
有限元法
桁架
开裂
结构工程
复合材料
延展性(地球科学)
剪应力
蠕动
工程类
作者
Pengcheng Zhang,Bin Peng
出处
期刊:Lecture notes in civil engineering
日期:2024-01-01
卷期号:: 345-358
标识
DOI:10.1007/978-981-99-3362-4_28
摘要
The ultra-high performance concrete (UHPC) has good ductility and can improve the beams’ shear performance potentially. To investigate the possible improvement, the shear performance of UHPC beams is simulated using the extended finite element method (XFEM). First, the embedded steel fibers are modeled using truss elements, and the UHPC matrix is modeled using solid elements. A program is developed to realize the random distribution of steel fibers in UHPC matrix. Second, the numerical model for UHPC specimen is established using XFEM and calibrated using experimental results. Finally, the shear failure of UHPC beams is simulated using the calibrated models. The simulation results show that: The embedded steel fibers relieve the (tensile) stress concentration in UHPC and then delay the cracking significantly, which improves the UHPC beams’ shear resistance. The shear resistance increases significantly when the steel fiber volume ratio is 2%. The steel fibers can weaken the phenomenon that the shear resistance decreases along with the increase of the shear-span ratio. Based on the material parameters in this paper, the stirrups can obviously improve the shear resistance of UHPC beams only if the shear-span ratio is between 1.6 and 2.6.
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