Recent research on composite beams with demountable shear connectors
Recent research on composite beams with demountable shear connectors
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DOI：
10.1002/stco.201710016
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发表时间：
2017-05
期刊：
影响因子：
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通讯作者：
D. Lam;X. Dai;A. Ashour;Naveed Rehman
中科院分区：
文献类型：
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作者：
D. Lam;X. Dai;A. Ashour;Naveed Rehman
本文对一种新型的可解构复合楼盖体系进行了实验和数值研究。在该体系中，使用可拆卸的剪力连接件将由金属压型面板形成的组合板连接到钢梁。进行了一系列推力试验，以研究这种形式的剪力连接件的性能。除了推力试验外，还在实验室对一根足尺组合梁在多次单调加载下进行了破坏试验。为了进行直接比较，进行了类似的组合梁试验，使用相同的截面尺寸和混凝土强度，但使用传统的焊接头部螺栓连接件。试验结果表明，带可拆卸剪力连接件的组合梁的受力性能与带焊接剪力连接件的试件相当。试验结束后，可拆卸的剪力连接件被松开，组合楼板可以很容易地从钢梁上剥离。试验结果表明，与等效的焊接剪力连接件相比，可拆卸式剪力连接件具有更高的延性。提出了目前用于焊接剪切连接的欧洲规范4和用于螺栓的欧洲规范3中的简单设计准则，以预测这种形式的可拆卸剪切连接件的抗剪强度。
This paper presents the experimental and numerical investigations of an innovative composite floor system with deconstructability. In this system, a composite slab formed with metal profiled decking is connected to a steel beam using demountable shear connectors. A series of push tests was conducted to investigate the behaviour of this form of shear connector. In addition to the push tests, a full‐scale composite beam was tested to failure in the laboratory under a number of cycles of monotonic loading. For direct comparison, a similar composite beam test was conducted using the same section size and concrete strength, but using conventional welded headed stud connectors. Test results showed that the behaviour of the composite beam with demountable shear connectors is comparable with that of the specimen with welded shear connectors. After the test was terminated, the demountable shear connectors were unfastened and the composite floor could be easily lifted off from the steel beam. Test results showed that these demountable shear connectors possess high ductility in comparison to the equivalent welded shear connectors. Simple design rules currently use in Eurocode 4 for welded shear connections and Eurocode 3 for bolts are proposed to predict the shear resistance of this form of demountable shear connector.