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新型抗拔不抗剪T型连接件能有效改善组合梁负弯矩区受力性能,该连接件可以保证钢构件与混凝土板不发生分离,允许两部分产生滑移从而降低传递至混凝土板的剪力,避免混凝土开裂。为研究该新型连接件的滑移性能,对6个试件进行了拟静力推出试验。试验结果表明该连接件在较低荷载作用下可以产生较好的滑移效果,连接件外包泡沫塑料的尺寸对滑移特征影响显著。试验的荷载-位移曲线反映出试件的刚度随加载历史发生了明显变化,滑移作用引起了曲线的捏拢现象。该文基于Richard-Abbott曲线提出了针对该新型连接件的滑移滞回模型,模型参数物理意义明确,并通过试验结果验证了该滞回模型的合理性。
The new anti-shear and anti-shear T-type connector can effectively improve the mechanical properties of composite beams in the negative bending moment zone, which can ensure the steel members and concrete slab separation, allowing the two parts slip and thus reduce the transmission to the concrete slab Shear, to prevent concrete cracking. In order to study the sliding properties of the new connector, six specimens were tested by pseudo-static method. The test results show that the connector can produce better slip effect under the low load, and the size of the connector plastic bag has a significant effect on the slip characteristics. The load-displacement curve of the test shows that the stiffness of the specimen changes obviously with the loading history, and the sliding effect causes the curve to be pinched. Based on the Richard-Abbott curve, this paper presents a sliding hysteresis model for the new connector. The physical meaning of the model parameters is clear. The rationality of the hysteretic model is verified by the experimental results.