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| Experimental Research on the Side Shear Strength of Novel Composite Pier with Socket Connections |
| LIU Baodong1, FENG Mingyang1, ZHANG Linlin1, SUN Haibo2, DOU Kangjian1 |
1. Beijing Jiaotong University, Beijing 100044, China;
2. Shandong Provincial Communications Planning and Design Institute Group Co. Ltd, Jinan, Shandong 250031, China |
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Abstract Research purposes: In order to meet the demand of green construction and rapid construction of bridge substructure, this paper carried out vertical loading tests and finite element numerical simulations on 7 novel corrugated steel-rubberized concrete composite pier-foundation specimens with socket connections to explore how connection types, embedment depths, shear studs, and end-bearing concrete affect their connect strength. Also, we studied the failure mechanism and side shear capacity of the proposed pier-foundation connections.
Research conclusions: (1) Socket connections have a 36% higher side shear capacity than integrated connections with the same embedding depths. Side shear capacity is increased by increasing embedding depths and adding end-bearing concrete. Similarly, shear studs in joint areas may strengthen circumferential shear zones even more. (2) When subjected to vertical loads, the "quasi-three-direction" compression state greatly improves the joint's side shear strength, which is achieved through the "strong physical interlock" of concrete and steel corrugates. (3) The coefficient K, named as the corrugation enhancement coefficient, is proposed to assess the contribution of "strong physical interlock" to side shear strength. K's value ranges from 0.12 to 0.18, and the waveform is the primary indicator that influences K. Based on the stress state of the joints, a formula for shear capacity is proposed, and the calculation results agree well with the experiment and simulation analysis. (4) A formula for the minimum thickness of end-bearing concrete is proposed, based on the plastic stress distribution method and taking lateral load into account, which can provide technical support for the design and application of corrugated steel composite pier with socket connections.
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Received: 17 September 2021
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2022, Vol. 39 
