Study on Seismic Performance Optimization of Assembly Concrete-Filled Steel Tubular (CFST)-Laced Piers

Abstract

This study aims to investigate the seismic behavior of concrete-filled steel tubular (CFST)-laced piers; after verifying the model through engineering tests, the simplified finite element models (S-FEM) and refined ones (R-FEM) with CFST-laced piers are developed in this manuscript, respectively. Through comparison, it is found that the S-FEM can effectively improve analyzing efficiency while meeting the requirements of engineering analysis accuracy. In addition, the seismic response of assembled flange-connected CFST-laced piers bridge was studied based on the S-FEM, and different structural parameters, including pier height, axial compression ratios, steel ratios of CFST columns, steel lacing tube arrangement, and longitudinal slope, are considered to optimize the bridge design scheme. Results indicate that the parameters of 0.1 axial pressure ratios and 1:30 longitudinal slope show superior seismic performance. Meanwhile, the peak axial force and peak bending moment of CFST column limbs occur at the pier bottom, and the flanges, which are subject to larger bending moments, are generally located at the two connection positions above the pier bottom.

Behavior of Two-Chord Steel–Concrete Composite Columns under Axial Compression

“…The results indicated that the deformability and load-bearing capacity of composite member were significantly better than those of the equivalent steel member owing to the presence of the concrete fill in the chord elements. Over time, researchers successively investigated the behavior of three-and four-legged CFST latticed member [7][8][9][10][11][12][13]. The factors considered in the investigations included axial capacities, the strength of the concrete in the chords, slenderness ratios, diameter-tothickness ratios in the tubular battens and chords, the arrangement of the battens or braces, and seismic excitations.…”