Abstract
In this study, the post-yield load-displacement relationships of precast composite beams with various boundary conditions were predicted based on strength degradation data. The aim of this study was to explore the post-yield hysteretic structural behavior of precast composite concrete beams based on stiffness degradation, which was calculated by normalizing effective stiffness with respect to stiffness at the yield limit state. The influence of degradation of the effective stiffness on the post-yield behavior of the specimens was investigated with extensive test data gathered using gauge measurements. The hysteresis behavior, determined from cyclic tests of full-scale composite specimens under the various boundary conditions, was used to predict the post-yield deflection of the composite beams. This paper collected post-yield test data for 13 specimens, including five pre-stressed specimens, to investigate the influence of pre-stressing forces on the post-yield characteristics of steel-concrete composite beams. The prediction of post-yield load-displacement relationships of the composite beams was based on six steps and matched well with test data, verifying the proposed analytical procedures for estimating post-yield performance. The post-yield load-displacement relationships of precast composite concrete beams were satisfactorily predicted by the simplified but convenient method.
Highlights
Steel-reinforced precast concrete frames (SRCs) have been widely used in the construction industry due to their favorable characteristics, which include high load-bearing capacity, energy dissipation, stiffness, and ductility [1,2,3]
Hong et al [5] presented an analytical method for predicting the ductility and post-yield deflection of four steel-concrete precast beams based on the stiffness degradation obtained from hysteretic load–displacement relationships
This study provided a simplified, but accurate strength degradation-based inelastic structural behavior analysis of steel-concrete composite beams loaded under various boundary conditions
Summary
Steel-reinforced precast concrete frames (SRCs) have been widely used in the construction industry due to their favorable characteristics, which include high load-bearing capacity, energy dissipation, stiffness, and ductility [1,2,3]. The use of precast steel-concrete components has increased recently for various reasons, including the efficiency and high quality of these structural members and the reduction in wasted resources for on-site activities [4]. A significant number of analytical and numerical investigations have been undertaken to assess the flexural behavior of steel-concrete composite beams under various types of loading [5,6,7]. Hong et al [5] presented an analytical method for predicting the ductility and post-yield deflection of four steel-concrete precast beams based on the stiffness degradation obtained from hysteretic load–displacement relationships. Nie et al [8] performed an analytical investigation on the stiffness and capacity of steel-concrete composite beams. A formula for the ultimate flexural capacity of steel-concrete beams was developed and verified by experimental investigations of five test specimens
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