Development of fully dry-connection for prefabricated hollow section CA-RPC pier

Article Engineering, Civil

Experimental and analytical study on crack resistance of fully prefabricated steel-UHPC composite deck using PBL connectors

Kailai Deng et al.

Summary: To enhance the crack resistance of a fully prefabricated composite deck, this study utilized perfobond rib (PBL) connectors as anti-cracking structure at the steel-ultra-high-performance concrete (UHPC) interface. The performance was evaluated through four-point bending tests on eight specimens, observing crack development, failure pattern, and load-deflection response. Results showed satisfactory crack resistance of the PBL connectors at the interface, even outperforming the cast-on-site reinforced UHPC section. The number and size of holes in the PBL connectors, as well as their placement direction, significantly affected the crack resistance. An analytical model was proposed to describe the cracking mechanism at the steel-UHPC interface, demonstrating satisfactory accuracy when compared with test results. Sensitivity analyses revealed that the initial cracking strength of the interface was most sensitive to the height of the PBL connectors.

ENGINEERING STRUCTURES (2023)

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Article Construction & Building Technology

Cyclic Response of Precast, Hollow Bridge Columns with Postpour Section and Socket Connection

Zhibin Jin et al.

Summary: Accelerated bridge construction (ABC) is widely used to achieve rapid construction, reduce traffic congestion and environmental impacts, and ensure reliable quality control. This study proposes an alternative solution using hollow section columns and shallow socket foundations to reduce the weight of precast columns and foundations. Experimental results show that utilizing postpour concrete can enhance the shear capacity of precast columns, and deeper postpour concrete sections can improve the energy dissipating capacity of precast columns.

JOURNAL OF STRUCTURAL ENGINEERING (2022)

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Article Engineering, Civil

Load transfer mechanism of precast concrete piers with demountable connections

Qiang Zhou et al.

Summary: A novel demountable steel-concrete composite connection for pier-pile cap joint was proposed, and its performance was verified through experiments and numerical analysis. The proposed connection enables rapid assembly and disassembly, and exhibits good stiffness and load-carrying capacity.

ENGINEERING STRUCTURES (2022)

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Article Engineering, Civil

Experimental investigation on the flexural behavior of coarse aggregate reactive powder concrete (CA-RPC) bridge deck

Zhao Liu et al.

Summary: The high mechanical characteristics of reactive powder/ultrahigh performance concrete have prompted its application in bridges, but its use as full structural components is limited by cost and design guideline inconsistencies. This paper introduces an innovative use of coarse aggregate reactive powder concrete (CA-RPC) and presents experiments on the flexural behavior of a full-size prefabricated slab. The results validate the sustained performance of RPC with coarse aggregate, demonstrating high capacity and excellent ductility.

ENGINEERING STRUCTURES (2022)

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Article Construction & Building Technology

Experimental and numerical investigations on cyclic behaviors of precast segmental bridge piers with the hybrid of high-strength bars and unbonded prestressing tendons

Teng Tong et al.

Summary: This paper investigated the cyclic behaviors of precast segmental piers reinforced with high-strength energy dissipation (H ED) bars and unbonded tendons, finding that tendons improved lateral strength and mitigated residual drift but also made concrete prone to damage. Additionally, a finite element model accurately reflected the piers' seismic behaviors, highlighting the importance of considering bond-slip behavior for H ED bars in numerical modeling.

ADVANCES IN STRUCTURAL ENGINEERING (2021)

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Article Construction & Building Technology

Dynamic splitting tensile bond behavior of new-to-old concrete interfaces

Bo Hu et al.

Summary: The study found that strain rate has a significant influence on the failure modes, compressive load-deformation curves, absorption energy, and splitting tensile bond strength of concrete interfaces, while surface roughness and interface age have minimal effects on the splitting tensile bond strength. Existing formulas for the dynamic increase factor of tensile strength of concrete-like materials cannot be applied to concrete interfaces, leading to the proposal of a new formula for the dynamic increase factor of the splitting tensile bond strength of concrete interfaces.

CONSTRUCTION AND BUILDING MATERIALS (2021)

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Article Engineering, Civil