Experimental and numerical study on the tensile behaviours of wet joints in steel-UHPC composite decks using a novel tensile test setup

Gao Xiao-Long; Wang Jun-Yan

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Experimental and numerical study on the tensile behaviours of wet joints in steel-UHPC composite decks using a novel tensile test setup

机译：用新型拉伸试验设置对钢 - UHPC复合甲板湿接缝拉伸行为的实验和数值研究

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摘要

A composite deck system composed of ultrahigh performance concrete (UHPC) and an orthotropic steel deck has been proposed to solve fatigue cracking and corrosion problems in traditional orthotropic steel deck systems. In a prefabricated steel-UHPC composite deck system, a wet joint is usually formed between two adjacent prefabricated UHPC layers. The interface between the prefabricated UHPC layer and cast-in situ UHPC is defined as a wet joint. To investigate the tensile behaviours of the wet joint, a novel tensile specimen configuration simulating the wet joint was initially proposed. The effects of reinforcement diameter and embedment length were experimentally investigated. The test results revealed that increasing the embedment length could enhance the crack resistance at the wet joint, but the influence could be neglected when the embedment length is greater than 10 d(b) (d(b) = diameter of reinforcement). Based on tensile tests, three-dimensional FE models were developed to simulate the tensile behaviours of the wet joint, and their accuracy was confirmed by the test results. With the validated FE model, the effect of UHPC thickness on the tensile behaviours of wet joints was investigated. Finally, specific design parameters were recommended according to the test and numerical results.

机译：已经提出了一种由超高性能混凝土（UHPC）和正交钢甲板组成的复合甲板系统，以解决传统的正交钢甲板系统中的疲劳裂缝和腐蚀问题。在预制的钢 - UHPC复合甲板系统中，通常在两个相邻预制的UHPC层之间形成湿接头。预制的UHPC层和浇注原位UHPC之间的接口定义为湿接头。为了研究湿接头的拉伸行为，最初提出了一种模拟湿接头的新型拉伸样品配置。实验研究了加强直径和嵌入长度的影响。测试结果表明，增加嵌入长度可以提高湿接头处的抗裂性，但是当嵌入长度大于10d（b）（d（b）=增强的直径时，可以忽略影响。基于拉伸试验，开发了三维Fe模型以模拟湿接头的拉伸行为，并通过测试结果证实了它们的准确性。利用验证的Fe模型，研究了UHPC厚度对湿接缝拉伸行为的影响。最后，根据测试和数值结果建议使用特定的设计参数。

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来源
《Materials and structures》 |2021年第2期|93.1-93.16|共16页
作者
Gao Xiao-Long; Wang Jun-Yan;
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作者单位

Tongji Univ Key Lab Adv Civil Engn Mat Minist Educ Shanghai 201804 Peoples R China|Tongji Univ Coll Civil Engn Shanghai 201804 Peoples R China;

Tongji Univ Key Lab Adv Civil Engn Mat Minist Educ Shanghai 201804 Peoples R China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种 eng
中图分类
关键词
UHPC; Wet joint; Composite deck; Tensile test; Finite element analysis;

机译：UHPC;湿联合;复合甲板;拉伸试验;有限元分析;

Experimental and numerical study on the tensile behaviours of wet joints in steel-UHPC composite decks using a novel tensile test setup

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