Abstract
This study presents experimental and numerical study on cyclic behavior of SRC composite columns-steel beam joints. The pseudostatic experiments were carried out on four samples with different axial loads. X-shaped shear reinforcement was added in the sample no. 4 in order to investigate its effect on the crack resistance in the joint core area. Low-frequency cyclic load was applied at beam ends to simulate the earthquake action. The failure characteristics, hysteretic behavior, stiffness degradation, shear resistance, and displacement ductility were investigated. Experimental results indicated that the failure mode of the joints was mainly shear failure, and the composite joints showed excellent seismic behavior with higher capacity and good ductility and energy dissipation ability. X-shaped shear reinforcement performed well to increase the concrete crack resistance. Shear forces from both experimental test and theoretical analysis were compared, and suggestions were given on modification of theoretical formulas. Simulation using the ABAQUS model showed good results that agreed well with the test results. Steel stress distribution and damage development were analyzed in the model. More parameters of web thickness, stiffener thickness, concrete strength, and stirrups and their influence on shear resistance were studied.
Highlights
SRC composite columns, a typical type of composite columns with structural steel and reinforcing steel bars embedded in reinforced concrete, having both advantageous properties of structure steel and reinforced concrete, have become widely used in high-rise buildings, large-span bridges, and transmission towers [1,2,3,4]
Xiang et al [9] conducted tests on seismic performance on SRC joints with composite columns consisting of T-shaped structural steel section and results showed satisfying shear resistance, ductility, and overall seismic capacity
From the Finite Element Model (FEM) results on parameter study, it can be concluded that those factors showed positive influence on improving joint shear resistance; in the order from the most obvious to the least obvious, they are web thickness, concrete strength, stirrup ratio, and stiffener thickness
Summary
SRC composite columns, a typical type of composite columns with structural steel and reinforcing steel bars embedded in reinforced concrete, having both advantageous properties of structure steel and reinforced concrete, have become widely used in high-rise buildings, large-span bridges, and transmission towers [1,2,3,4]. SRC composite columns showed enhanced stiffness, stronger energy-absorption capacity, and better ductility than traditional reinforced concrete structures and steel structures. How to improve seismic performance and design procedure of column-beam joints has attracted great attention in current research In these composite columns-steel-beam joints, the property difference between beams and columns has made the analysis more complicated. Xiang et al [9] conducted tests on seismic performance on SRC joints with composite columns consisting of T-shaped structural steel section and results showed satisfying shear resistance, ductility, and overall seismic capacity. Tao et al [11] carried out tests on four joints specimens and, based on results from load-deflection curves, shear capacity in joint core area, strength, and stiffness degradation and ductility, they reported that seismic capacity can be improved through proper control of design to obtain better failure modes. En FEM simulation was carried out using ABAQUS model and, through comparison between experimental results and simulation data, suggestions on shear capacity formulas were given
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