In this study, seven steel and concrete composite beams (SCCBs) connected by T-shaped perfobond rib (PBL) shear connectors were tested to evaluate cracking performance in the hogging moment area. The selected parameters included the type of shear connectors, T-shaped PBL flange widths, and reinforcement ratios. The impact of these parameters on the crack distribution and load-crack width relationship was emphasized in this study. Finally, a modified method was developed that accounts for the T-shaped PBLs to estimate the average crack spacing and maximum crack width in the hogging moment regions of the composite beams. It was found that the flange enhances the cracking performance of the T-shaped PBL connectors. Compared with the composite beam with a flange width of 70 mm, the average crack spacing of 100 mm- and 130 mm-width decreased by 22% and 24%. The reinforcement ratio was a crucial factor affecting the cracking performance of the composite beam. The modified equations provided accurate predictions for the maximum crack width and mean crack spacing, with average calculated-to-test ratios of 0.92 and 1.00, respectively, and standard deviations of 0.11 and 0.09. This research could improve understanding of the cracking performance of SCCBs connected with T-shaped PBLs and provides guidance for crack control design.
Wenfeng Huang — Department of Bridge Engineering, Southwest Jiaotong University, Chengdu 610031, China
Yulin Zhan — 1)Department of Bridge Engineering, Southwest Jiaotong University, Chengdu 610031, China 2)Institute of Civil Engineering Materials, Southwest Jiaotong University, Chengdu 610031, China
Wenting Lyu — Department of Bridge Engineering, Southwest Jiaotong University, Chengdu 610031, China
Hengjia Zhang — Department of Bridge Engineering, Southwest Jiaotong University, Chengdu 610031, China
Haijun Jiang — Qingdao Municipal Engineering Design and Research Institute Ltd, Qingdao, 266000, China
Junhu Shao — 1)Department of Bridge Engineering, Southwest Jiaotong University, Chengdu 610031, China 2)School of Architecture and Civil Engineering, Chengdu University, Chengdu 610106, China
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