Response of RPC‐Filled Circular Steel Tube Columns under Monotonic and Cyclic Axial Loading

Rong, Qin; Zeng, Yusheng; Guo, Lanhui; Hou, Xuyan; Zheng, Wenzhong

doi:10.1155/2019/9141592

Cited by 3 publications

(2 citation statements)

References 29 publications

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“…Wang et al [ 10 ] analyzed the failure process of tubular columns filled with RPC under axial loading and studied the effects of loading mode, diameter‐to‐thickness ratio of steel tubes, and concrete strength on axial compression performance. Rong et al [ 11 ] obtained the load–deformation curves of circular tubular columns filled with RPC under monotonic and cyclic loading, respectively. They verified the accuracy of the compressive strength formula based on the Mander model and developed a new formula for calculating the compressive strength of circular steel tubular RPC columns.…”

Section: Introductionmentioning

confidence: 99%

Restoring force model of square tubular columns filled with extra‐high‐performance reactive powder concrete

Hao

Wei

et al. 2022

Structural Design Tall Build

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Square tubular column filled with extra-high-performance reactive powder concrete (RPC) is a novel composite structure that takes advantage of strong bending resistance of steel tubes and high compressive strength and toughness of RPC. To study the seismic performance of square tubular columns filled with RPC, a series of lowcycle lateral loading tests were performed on four square tubular columns filled with RPC. The steel content and steel fiber content were selected as test parameters.Experimental results show that a higher steel content and 1% steel fiber result in good energy dissipation and deformation performance of specimens. To establish the restoring force model of square tubular columns filled with RPC, 18 column models with different steel content, axial compression ratio, and slenderness ratio were simulated and analyzed using ABAQUS. The simulation results show that a larger steel content and smaller slenderness ratio can improve the column bearing capacity, but the influence of axial compression ratio is negligible. A restoring force model considering stiffness degradation is proposed using a regression analysis method, which is in good agreement with the experimental results.composite column, finite element method, hysteresis curve, reactive powder concrete, restoring force model, square steel tube | INTRODUCTIONConcrete filled steel tubular (CFST) columns are superior in bearing capacity, toughness, constructibility, fire resistance, and cost effectiveness. As a result, CFST columns have been widely used in industrial plants, bridges, and buildings. However, with the vigorous development of high-rise buildings, higher performance of CFST columns is required in component size, bearing capacity, and lateral stiffness. In addition to increasing the steel content and improving the section configurations, reactive powder concrete (RPC) can be filled internally to meet these requirements. Compared to high-strength concrete (HSC), RPC has excellent mechanical properties such as higher strength, toughness, and durability. [1,2] Its compressive strength is two to four times, fracture energy is 200 times, and the chloride ion permeability coefficient is 1/60 of HSC. However, the disadvantages of RPC, such as its brittleness and poor ductility, limit its development in the engineering field. The compressive strength and deformation performance of RPC can be significantly improved with the confinement of steel tubes. Therefore, the combination of steel tubes and RPC has great advantages.CFST structures include composite structures of different steel tubes and different types of concrete. The seismic performance of CFST structures was studied with different concrete strength, steel strength, restraint coefficient, axial compression ratio, and diameter-to-thickness ratio as parameters. [3][4][5][6] Fam et al. [7] and Ge and Usami [8] studied the seismic performance of CFST specimens under the combined action of axial compression and lateral cyclic loading and concluded that CFST has high strength and good duct...

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Section: Introductionmentioning

confidence: 99%

Restoring force model of square tubular columns filled with extra‐high‐performance reactive powder concrete

Hao

Wei

et al. 2022

Structural Design Tall Build

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“…Recently, our research group conducted seismic behavior tests on steel plate shear walls (SPSWs) and concrete filled steel tube (CFST) columns [26,27].…”

Section: Introductionmentioning

confidence: 99%

Seismic Performance of CFST Frame‐Steel Plate Shear Walls Connected to Beams Only

Rong

Zhao

Guo

et al. 2021

Shock and Vibration

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The safety and cost of structures composed of concrete-filled steel tube (CFST) frame-steel plate shear walls (SPSWs) with two-side connections are governed by the seismic performance. The response modification factor R and displacement amplification factor Cd are important seismic performance factors. In this paper, nonlinear seismic responses of 10-story, 15-story, and 20-story CFST frame-SPSWs (CFST-SPSWs) are studied. A nonlinear finite element model which includes both material and geometric nonlinearities is developed using the finite element software OpenSees for this study. The accuracy of model was validated by comparing with experimental results. Nonlinear seismic analysis shows that CFST-SPSWs, in high seismic region, behave in a stable and ductile manner. Also, R and Cd of CFST-SPSWs were evaluated for the structure models using incremental dynamic analysis (IDA), and the average values of 3.17 and 3.05 are recommended, respectively. The recommended R value is greater than the value (2.8) in the “Chinese Code for seismic design of buildings” for composite structures, indicating the code is conservative. The structural periods provided by current code are generally lower than the periods calculated by finite element analysis. Research results show that R and Cd increase with increasing story number, span number, and structural period. Ductility reduction factor Rμ increases with increasing span number and decreasing story number. Overstrength factor Rs increases with increasing story number and decreasing span number.

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Experimental Study on Bearing Capacity of Compression Members of Space Grid Structures Reinforced by RPC

et al. 2022

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Insufficient bearing capacity of compression bars in space grid structures can significantly reduce the collapse resistance of structures and cause immeasurable losses. Reactive powder concrete (RPC) with high strength, micro-expansion, and good ductility is used to reinforce the compression members of grid structures by infilling steel tubes. Axial compression tests on five types of high-frequency welded pipes with different section sizes and initial stresses were carried out. The results showed that compared to steel tubes alone, the bearing capacity of steel tubes reinforced by RPC could be increased by 75.77 to 218.34%. With a decrease of either the initial stress or confinement coefficient, the contribution of the material reinforcement increased. The failure mode of the specimen after RPC grouting was the same as that of the non-reinforced steel pipe, which was dominated by elastic-plastic buckling. The grouting hole after reinforcement did not fail prior to the instability of the member, which suggests that necessary measures to repair the hole should be taken. Based on the design method of axial compression bearing capacity of concrete-filled steel tubular members in six codes in China and abroad, the test results of this paper and 242 RPC-filled steel tubes were compared and analyzed. Finally, an equation of nominal bearing capacity, which estimates the ultimate bearing capacity of compressive members strengthened by filled RPC in grid structures, was proposed.

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Response of RPC‐Filled Circular Steel Tube Columns under Monotonic and Cyclic Axial Loading

Cited by 3 publications

References 29 publications

Restoring force model of square tubular columns filled with extra‐high‐performance reactive powder concrete

Restoring force model of square tubular columns filled with extra‐high‐performance reactive powder concrete

Seismic Performance of CFST Frame‐Steel Plate Shear Walls Connected to Beams Only

Experimental Study on Bearing Capacity of Compression Members of Space Grid Structures Reinforced by RPC

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