Influence of non-persistent joint sets on the failure behaviour of concrete under uniaxial compression test

IF 2.9 4区 工程技术 Q2 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Computers and Concrete Pub Date : 2021-09-01 DOI:10.12989/CAC.2021.28.3.289
Mohammad Saeed Amini, V. Sarfarazi, N. Babanouri
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引用次数: 1

Abstract

Discrete element and experimental approaches were utilized for investigating the effects of non-persistent joint sets on the failure behaviour of concrete under uniaxial compressive test. concrete specimens (100 mmx120 mmx50 mm dimension) were prepared. Tensile strength of concrete was 1 MPa. Two sets of specimens consisting three and five joints were prepared. These joint have two different parallel and intersecting configurations. In samples consisting both of the parallel and intersecting configurations with three joints, the length of larger joint was 6 cm and the lengths of two small joints was 3 cm. In samples consisting both of the parallel and intersecting configurations with five joints, The length of two larger joints were 3 cm and the lengths of three small joints was 2 cm. When the notch number was 3, the angle of larger joints were changed from 0o to 90o by increasing the 30o. When the notch number was 5, the angle of smaller joints were changed from 0o to 90o by increasing the 30o. In intersectiong joint configurations, two joint sets were perpendiqular to eachother. Totally, 16 different models were tested under compression test. Cuncurrent with experimental tests, numerical simulation (Particle flow code in two dimension) were performed on the models comprising non-persistent joint sets. joints configurations were similar to experimental one. the results revealed that the failure procedure was governed mostly by both of the joint configuration. The specimens' compressive strengths were associated with the failure mechanism and fracture pattern of the discontinuities. Furthermore it was shown that the discontinuities' compressive behaviour is caused by the number of the induced tensile cracks incremented by decreasing the joint length. Only some AE hits exist in the initial phase of loading, then AE hits grow rapidly prior to reaching the peak applied stress. Moreover, every stress drop was convoyed by numerous AE hits. Finally, the failure strength and pattern are similar in both approaches of the experimental tests and the numerical simulation.
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非持久节点集对混凝土单轴压缩破坏行为的影响
采用离散元法和实验法研究了非持久节点集对混凝土单轴压缩破坏行为的影响。制备尺寸为100mmx120mmx50mm的混凝土试件。混凝土抗拉强度为1 MPa。制备了三节和五节两组试件。这些关节有两种不同的平行和相交结构。在三个节理平行构型和三个节理相交构型的样品中,大节理长度为6 cm,两个小节理长度为3 cm。在包含5个节点的平行构型和相交构型的样品中,两个较大的节点长度为3 cm,三个较小的节点长度为2 cm。当缺口数为3时,通过增加缺口数300,较大节点的角度由0°变为90°。当缺口数为5时,通过增加缺口数300,小节点的角度由0°变为90°。在相交关节构型中,两个关节组相互垂直。共对16种不同的模型进行了压缩试验。在进行试验的同时,对包含非持久关节集的模型进行了数值模拟(二维粒子流代码)。关节构型与实验相似。结果表明,破坏过程主要受两种接头形态的控制。试件的抗压强度与结构面破坏机制和断裂模式有关。结果表明,随着节理长度的减小,裂缝数量的增加导致了裂缝的压缩特性。加载初期仅有部分声发射命中,加载后声发射命中在达到峰值前迅速增长。此外,每一次应力下降都是由无数声发射命中传递的。最后,试验试验和数值模拟的破坏强度和破坏形态相似。
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来源期刊
Computers and Concrete
Computers and Concrete 工程技术-材料科学:表征与测试
CiteScore
8.60
自引率
7.30%
发文量
0
审稿时长
13.5 months
期刊介绍: Computers and Concrete is An International Journal that focuses on the computer applications in be considered suitable for publication in the journal. The journal covers the topics related to computational mechanics of concrete and modeling of concrete structures including plasticity fracture mechanics creep thermo-mechanics dynamic effects reliability and safety concepts automated design procedures stochastic mechanics performance under extreme conditions.
期刊最新文献
Numerical investigation on RC T-beams strengthened in the negative moment region using NSM FRP rods at various depth of embedment Forced vibration analysis of a micro sandwich plate with an isotropic/orthotropic cores and polymeric nanocomposite face sheets Influence of non-persistent joint sets on the failure behaviour of concrete under uniaxial compression test Nonlinear vibration behavior of hybrid multi-scale cylindrical panels via semi numerical method Improving the seismic performance of reinforced concrete frames using an innovative metallic-shear damper
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