十字带侧板型抗剪连接件力学性能试验及有限元研究

Experimental and finite element method research on the mechanical properties of cross-bilinear-type shear connectors

提出一种应用于装配式混凝土梁与耗能段之间的十字带侧板型抗剪连接件,以提高两者之间的受剪性能。设计3个考虑混凝土强度和抗剪连接件长度的试验模型,开展往复荷载下的力学性能研究。随后采用ABAQUS软件进行有限元分析验正,并设计21个考虑混凝土梁强度、抗剪连接件长度、侧板高度、中间竖板高度和端板厚度影响的有限元模型,进而对各模型开展有限元模拟分析。结果表明:3个试件的破坏形态基本一致,且滞回曲线走势基本相同。增大混凝土强度、长度、侧板高度和中间竖板高度可提高抗剪连接件的承载力并减小其位移值,但设计时长度不宜超过180 mm,且宜尽量提高侧板和中间板高度;改变端板厚度对抗剪连接件性能无明显影响,设计时仅需满足规范要求。

An innovative cross-bilinear-type(CBT)shear connector was proposed to improve the shear capacity between structural shear link and prefabricated concrete beam. Three pieces of CBT shear connectors were designed to carry out the mechanical research under cyclic loading,considering the effect of concrete strength and shear connector length. Using the finite element method(FEM)software ABAQUS to analyze and verify,then 21 pieces of models were simulated,considering the influence factors of concrete beam strength,CBT shear connector length,side plate height,middle plate height and end plate thickness. The test results show that the three CBT specimens represent the similar failure modes and hysteresis curves. By increasing of the concrete beam strength,CBT shear connector length,side plate height and middle plate height can effectively improve the bearing capacity and decrease the slip value of CBT shear connectors. However,the suggested length should be not greater than 180mm,and it should enlarge the side plate height and middle plate height. Moreover,the endplate thickness has a very limited effect on the mechanical property of CBT shear connector,so it only needs to satisfy the standard requirement.