Structural Engineering and Mechanics

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Bond-slip constitutive model of concrete to cement-asphalt mortar interface for slab track structure

  • Su, Miao (School of Civil Engineering, Changsha University of Science and Technology) ;
  • Dai, Gonglian (School of Civil Engineering, Central South University) ;
  • Peng, Hui (School of Civil Engineering, Changsha University of Science and Technology)
  • Received : 2019.01.17
  • Accepted : 2020.01.10
  • Published : 2020.06.10
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Abstract

The bonding interface of the concrete slab track and cement-asphalt mortar layer plays an important role in transferring load and restraining the track slab's deformation for slab track structures without concrete bollards in high-speed railway. However, the interfacial bond-slip behavior is seldom considered in the structural analysis; no credible constitutive model has been presented until now. Elaborating the field tests of concrete to cement-asphalt mortar interface subjected to longitudinal and transverse shear loads, this paper revealed its bond capacity and failure characteristics. Interfacial fractures all happen on the contact surface of the concrete track slab and mortar-layer in the experiments. Aiming at this failure mechanism, an interfacial mechanical model that employed the bilinear local bond-slip law was established. Then, the interfacial shear stresses of different loading stages and the load-displacement response were derived. By ensuring that the theoretical load-displacement curve is consistent with the experiment result, an interfacial bond-slip constitutive model including its the corresponding parameters was proposed in this paper. Additionally, a finite element model was used to validate this constitutive model further. The constitutive model presented in this paper can be used to describe the real interfacial bonding effect of slab track structures with similar materials under shear loads.

Keywords

Acknowledgement

The research described in this paper was financially supported by the National Natural Science Foundation of China (grant number 51808056), Research Project of Hunan Provincial Department of Education (grant number 19B012), Open Fund of National-Local Joint Laboratory of Engineering Technology for Long-term Performance enhancement of Bridges in Southern District (grant number 18KB02), and the China Scholarship Council (Grant No.201808430232).

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