Reduction mechanism of the compressive properties of concrete with primary crack of different widths and angles evaluated by 3D-RBSM
Reduction mechanism of the compressive properties of concrete with primary crack of different widths and angles evaluated by 3D-RBSM
复制标题
3D-RBSM评价不同宽度和角度初生裂缝混凝土压缩性能的降低机理
DOI：
10.1016/j.engfracmech.2022.108877
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发表时间：
2022
影响因子：
5.4
通讯作者：
Yamamoto Yoshihito
中科院分区：
文献类型：
--
作者：
Miura Taito;Nakamura Hikaru;Yamamoto Yoshihito
在这项研究中，混凝土的压缩性能的降低机制与机械诱导裂缝的不同宽度和角度进行了评估，使用一个离散的力学模型。分析研究进行了沿着与实验可视化的变化，在应力传递的横截面中，由于一个主裂纹的存在。基于刚体弹簧模型（RBSM）对横截面应力分布的可视化，阐明了主裂纹在压应力作用下的力学响应以及抗压强度和弹性模量的降低机理。结果表明，RBSM可以再现不同裂缝宽度和角度的开裂混凝土的抗压强度和最大切向刚度的降低。此外，考虑到裂纹角度的影响，新阐明了由于初始裂纹的存在而导致的强度和刚度的降低机制。
In this study, the reduction mechanism of the compressive properties of concrete with mechanically induced crack of different widths and angles was evaluated using a discrete mechanical model. Analytical investigations were conducted along with experiments to visualize the change in the stress transfer in a cross-section due to the presence of a primary crack. Based on the visualization of the stress distribution in the cross-section using a rigid body spring model (RBSM), the mechanical response of the primary crack under compressive stress and the reduction mechanism of compressive strength and elastic modulus were elucidated. Based on the results, it was concluded that the RBSM could reproduce the reduction in compressive strength and maximum tangential stiffness of cracked concrete with different crack widths and angles. Furthermore, the reduction mechanism of strength and stiffness due to the presence of a primary crack was newly elucidated considering the influence of the angle of the crack.