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Study on composite beams with prefabricated steel bar truss concrete slabs and demountable shear connectors

机译：预制钢筋桁架混凝土板与可拆卸剪力连接件组合梁的研究

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In the conventional steel-concrete composite beams, the composite action is achieved by welded stud connectors which are encased into the cast-in-place concrete slab. This makes the deconstruction and reuse of the structural components almost impossible. A sustainable and prefabricated composite structural system was developed in this study wherein the steel beam is attached to the prefabricated steel-bars truss concrete slab using the demountable bolted connectors. Twelve push-out specimens were designed and tested to assess the shear behavior of the bolted connectors. The test results showed that the shear bearing capacity of the bolted connectors with the prefabricated steel-bars truss concrete slab increased 7.0% over that of the bolted connectors with the prefabricated normal concrete slab. Three full-scale composite beams with various shear connection ratios were constructed and loaded to failure. For direct comparison, a similar composite beam was constructed with the same section size and shear connectors, but using the cast-in-place concrete slab. The flexural capacity of the composite beams with 68% shear connection and full shear connection increased 9.8% and 15.8% compared to the composite beam with 46% shear connection, respectively. The mechanical behavior of the composite beam with the prefabricated concrete slab was comparable with that of the composite beam with cast-in-place concrete slab. The load carrying capacity of the composite beam can be predicted by the simplified model in Eurocode 4 and the plastic model.
机译：在传统的钢-混凝土复合梁中，复合作用是通过将焊接的螺柱连接器封装到现浇混凝土板中来实现的。这使得结构部件的解构和重用几乎是不可能的。在这项研究中，开发了一种可持续的预制复合结构系统，其中，钢梁通过可拆卸的螺栓连接器连接到预制的钢筋桁架混凝土板上。设计并测试了十二个推出样本，以评估螺栓连接器的剪切性能。试验结果表明，预制钢筋-桁架混凝土板的螺栓连接器的抗剪承载力比预制普通混凝土板的螺栓连接器的抗剪承载力提高了7.0％。构造了三个具有各种剪切连接比的全尺寸组合梁，并将其加载至破坏。为了直接比较，使用截面尺寸和剪力连接器相同但使用现浇混凝土板建造的类似复合梁。与具有46％剪力连接的组合梁相比，具有68％剪力连接和全剪力连接的组合梁的抗弯承载力分别增加了9.8％和15.8％。预制混凝土板的复合梁的力学性能与现浇混凝土板的复合梁的力学性能相当。复合梁的承载能力可以通过Eurocode 4中的简化模型和塑性模型来预测。

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