Seismic experiment and performance index studies on recycled aggregate concrete filled steel tube frames infilled with recycled hollow block filler walls

2020 ◽  
Author(s):  
Ercong Meng ◽  
Yalin Yu ◽  
Xianggang Zhang ◽  
Yisheng Su
Keyword(s):  
Performance Index ◽  
Steel Tube ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Aggregate Concrete ◽  
Concrete Filled Steel Tube ◽  
Seismic Experiment ◽  
Hollow Block ◽  
And Performance

Reliability Analysis on Load-Bearing Capacity of Axially Loaded of Recycled Aggregate Concrete-Filled Steel Tube

2014 ◽  
Vol 711 ◽  
pp. 438-443
Author(s):  
Rong Hua Yang ◽  
Gao Bo Mai
Keyword(s):  
Reliability Index ◽  
Coarse Aggregate ◽  
Great Influence ◽  
Steel Tube ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Order Moment ◽  
Aggregate Concrete ◽  
Concrete Filled Steel Tube ◽  
Recycled Coarse Aggregate

The first degree second order moment method (JC method) is applied to analyze the reliability of recycled aggregate concrete-filled steel tube (RACFST). Several performances are studies, which are the influences of different load combinations, specific values of loads,confinement coefficients and recycled coarse aggregate replacement percentage on the reliability of the column. It is found that the reliability index varied with the load combination and specific value of loads. The analytical results indicate that the reliability index of the round steel tube is higher than square steel tube and the influence of recycled coarse aggregate replacement percentage can almost be ignored It can be concluded that the formula had great influence on reliability index and the revised formula can meet the requirements of the ductility of structure reliability.

Axial behavior of carbon fiber-reinforced polymer–confined recycled aggregate concrete-filled steel tube slender square columns

2021 ◽  
pp. 136943322110339
Author(s):  
Jiongfeng Liang ◽  
Siqi Lin ◽  
Mizan Ahmed
Keyword(s):  
Steel Tube ◽  
Recycled Aggregate Concrete ◽  
Fiber Reinforced Polymer ◽  
Recycled Aggregate ◽  
Fiber Reinforced ◽  
Replacement Ratio ◽  
Aggregate Concrete ◽  
Concrete Filled Steel Tube ◽  
Reinforced Polymer ◽  
Axial Behavior

The behavior of fiber-reinforced polymer (FRP)–confined recycled aggregate concrete-filled steel tube (RACFT) columns is barely studied. Especially, that of slender specimens has not been investigated so far. In this article, an experimental test of FRP-confined RACFT slender square columns was conducted to study the influences of recycled aggregate (RA) replacement ratios, FRP thicknesses, and wrapping schemes on their axial behavior. Results in this article suggest that the RA replacement ratio barely affects the initial stiffness of load-deflection curves of specimens. Moreover, the specimen with a higher RA replacement ratio has a lower axial stress but larger strain at the peak point. The external FRP jackets (either partial or full wrap) can effectively improve the performance of axially loaded RACFT columns, and the improvement of ductility due to the increase of the FRP thickness is more significant than that of axial compressive strength. Additionally, it was found that the axial strength and ultimate axial strain decrease with increasing slenderness ratios. Furthermore, the influences of slenderness ratios on the behavior of such columns are more significant for the column with a larger length-to-width ratio. Finally, a design model for FRP-confined RACFT slender square columns is developed, which can predict the results of the present test accurately.

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