Analytical approach and design method for evaluation of compressive arch action of precast concrete beams. (1st April 2023)

• Record Type: Journal Article
• Authors: Bao, Yintong; Tan, Kang Hai
• Is Part Of: Engineering structures. Volume 280(2023)
• Publication Date: 2023-04-01
• Subjects: Analytical approach -- Compressive arch action -- Precast concrete structure -- l-shaped precast interface -- Precast interface location -- Progressive collapse -- Simplified design method; Structural engineering -- Periodicals; Structural analysis (Engineering) -- Periodicals; Construction, Technique de la -- Périodiques; Génie parasismique -- Périodiques; Pression du vent -- Périodiques; Earthquake engineering; Structural engineering; Wind-pressure; Periodicals; 624.105
• DOI: 10.1016/j.engstruct.2023.115603
• Languages: English
• ISSNs: 0141-0296

Abstract

Highlights: Analytical approach to predict compressive arch action of precast concrete beam under middle column removal scenarios. Effect of the plastic hinge at the precast beam-column joint interface can be considered. An easy-to-use design method is proposed and verified. Three different mechanisms of compressive arch action influenced by the varying precast interface locations are studied. Abstract: This paper proposes an analytical approach to predict compressive arch action (CAA) of precast reinforced concrete (PC) beams subjected to middle column removal scenario (MCRS). A beam-column joint with non-seismic detailing is employed in the prototype PC structures, which is a typical joint widely applied in low seismic-risk countries. However, under MCRS, a weaker sagging moment resistance of the precast interface near the removed middle column casts doubts on its structural performance. Based on particular details of the PC beams, the analytical approach is proposed to consider the influences of a potential plastic hinge at the PC interface, various precast interface locations, special precast reinforcing details and horizontal restraint conditions on the mobilisation of CAA. Furthermore, an easy-to-apply design method is developed by assuming linear relationships between bending moment, neutral axis depth and compression force of the PC beam. Reliability of the analytical approach and the design method is verified through comparisons between predictions and FEM simulations of typical two-span PC sub-assemblages with various design details. The comparison study suggests that both the analytical approach and design method can accurately predict the CAA capacity and corresponding displacement, as well as the maximum compression force and bending moment at PC beam ends. Finally, a parametric study is carried out to shed light on the effects of different precast interface locations and various common design details on CAA peak resistance. It is found that when the distance ( L 3 ) between the precast interface and the beam end interface does not exceed a threshold value ( L 3_c ), increasing L 3 can significantly enhance CAA capacity. However, when L 3 exceeds L 3_c, CAA cannot be further enhanced due to transformation of CAA mechanism. It also finds that the threshold value L 3_c is highly influenced by reinforcement details, span-over-depth ratio and horizontal stiffness of the beam.