Numerical Analysis on the Seismic Resistance of Steel Tube Columns Filled with Recycled Aggregate Concrete

2013 ◽  
Vol 446-447 ◽  
pp. 1472-1476
Author(s):  
Xu Xiang Wang ◽  
Feng Liu ◽  
Wen Xian Feng ◽  
Lan Zeng
Keyword(s):  
Finite Element ◽  
Yield Strength ◽  
Compression Ratio ◽  
Steel Tube ◽  
Nonlinear Finite Element ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Seismic Resistance ◽  
Aggregate Concrete ◽  
Axial Compression Ratio

Horizontal bearing capacity and seismic resistance of Recycled aggregate Concrete Filled Steel Tube (RCFST) columns under low cyclic loads have been analyzed by nonlinear finite element software in this paper. A three-dimensional nonlinear finite element (FE) model was developed, and some parameters that affect the restoring force model of RCFST columns were studied, including axial compression ratio, steel ratio, steel yield strength, strength of core recycled aggregate concrete and recycled aggregate substitution rate. Analysis results show that, along with steel ratio, steel yield strength and recycled aggregate substitution rate increasing, seismic resistance of RCFST becomes better. However, the increase of core recycled aggregate concrete and axial compression ratio will weaken seismic resistance of RCFST columns.

Study on Recycled Aggregate Concrete Frame Joints with Method of Nonlinear Finite Element

2009 ◽  
Vol 417-418 ◽  
pp. 745-748
Author(s):  
Jian Zhuang Xiao ◽  
M.M. Tawana ◽  
Xiao Hui Zhu
Keyword(s):  
Finite Element ◽  
Seismic Behavior ◽  
Low Frequency ◽  
Nonlinear Finite Element ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Displacement Curve ◽  
Element Analysis ◽  
Aggregate Concrete ◽  
Concrete Frame

With the achievements made in the research of mechanical properties for recycled aggregate concrete, this paper adopts the method of nonlinear finite element to analyze the seismic behavior of frame joints. The frame joints are made of recycled aggregate concrete. It also takes into account the bond behavior between steel bars and recycled aggregate concrete in the core area of the joints, and the force-displacement curve of the joints is calculated. Nonlinear finite element analysis shows that the results of the calculations are in accordance with the test results. It is concluded in this paper that, built models with nonlinear finite element method can be applied in simulating exactly the same seismic behavior of frame joints under low frequency reversed lateral loading.

scholarly journals Numerical Study on Confinement Effect and Efficiency of Concentrically Loaded RACFRST Stub Columns

2021 ◽  
Vol 8 ◽  
Author(s):  
Yicen Liu ◽  
Fei Lyu ◽  
Faxing Ding ◽  
En Wang ◽  
Yunlong Xu ◽  
...  
Keyword(s):  
Finite Element ◽  
Bearing Capacity ◽  
Steel Tube ◽  
Recycled Aggregate Concrete ◽  
Confinement Effect ◽  
Recycled Aggregate ◽  
Recycled Aggregates ◽  
Superposition Method ◽  
Aggregate Concrete ◽  
Stub Columns

The mechanical behaviors of recycled aggregate concrete (RAC) are upgraded by outer steel tube confinement, and the performance of recycled aggregate concrete-filled steel tubular (RACFST) columns is similar to that of the traditional concrete-filled steel tube (CFST) columns. The purpose of this study is to investigate the behaviors of recycled aggregate concrete-filled rectangular steel tubular (RACFRST) stub columns under axial loading. Three-dimensional finite element (FE) models were established, which utilized a triaxial plastic-damage constitutive RAC model considering the replacement ratio of recycled aggregates. The finite element analysis results indicated that the lessened ultimate bearing capacity of RACFRST stub columns compared with their traditional concrete infilled counterparts was mainly due to the weakened confinement effect and confinement efficiency. A simplified formula of the bearing capacity of concentrically loaded RACFRST stub columns was proposed. The cross-sectional stress nephogram was reasonably simplified by the limited state of infilled concrete. The basics of proposed formula were the equilibrium condition and the superposition method. Finally, the formula for the bearing capacity of RACFRST stub columns was evaluated by comparing its accuracy and feasibility to some design formulae proposed by specialists and some design codes of different regions.

Mechanical Research on Bond-Slip Behaviors of Recycled Aggregate Concrete-Filled Square Steel Tubes

2012 ◽  
Vol 166-169 ◽  
pp. 3233-3236 ◽  
Author(s):  
Jun Tao Li ◽  
Jin Jun Xu ◽  
Zong Ping Chen ◽  
Yi Li ◽  
Ying Liang
Keyword(s):  
Bond Strength ◽  
Concrete Strength ◽  
Steel Tube ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Replacement Rate ◽  
Steel Tubes ◽  
Aggregate Concrete ◽  
Bond Slip ◽  
Ultimate Bond Strength

In order to research the interface bond-slip behaviors of recycled aggregate concrete-filled square steel tube (RACFSST), ten specimens using waste concrete were designed for launch test. The three changing parameters were concrete strength grade, embedded length and recycled coarse aggregate replacement rate. The load–slip curves of square steel tubes and recycled aggregate concrete were obtained, and starting bond strength and ultimate bond strength influenced by each changing parameter were analyzed. The results show that the replacement rate had a slight influence on the starting bond strength and ultimate bond strength, while the embedded length had the opposite effect. The shorter embedded length specimens had larger bond strength. The concrete strength had a relatively large influence on them.

Microstructure and Finite Element Analysis of Recycled Aggregate Concrete

2013 ◽  
Vol 357-360 ◽  
pp. 1383-1388 ◽  
Author(s):  
Hai Feng Yang ◽  
Zhi Heng Deng ◽  
Yue Feng Hu
Keyword(s):  
Finite Element ◽  
Transition Zone ◽  
Weak Link ◽  
Recycled Aggregate Concrete ◽  
Interfacial Structure ◽  
Recycled Aggregate ◽  
Element Analysis ◽  
Aggregate Concrete ◽  
Finite Element Software ◽  
Structure And Microstructure

In order to study the mechanistic differences between recycled aggregate concrete (RAC)and normal aggregate concrete(NAC), the magnifier and scanning electron microscope were used to observe the meso-interfacial structure and microstructure of interfacial transition zone morphology of the RAC respectively, and analysed differences between RAC and NAC; Secondly, the finite element software ABAQUS was used to simulation the simplified model of RAC. The above analysis results show that, there existe a transition zone in the interface, the aggregate-new mortar interface as well as the new-old mortar interface has been obvious cracks before loading, this part is the weak link of RAC ;After loading, the crack occurs first in the old interface, then appeared at the new interface, and then develop to the old mortar, finally, there formed a through crack.

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