EFFECT OF ASPECT RATIO ON THE BEHAVIOR OF GFRP-RC CIRCULAR COLUMNS UNDER SIMULATED SEISMIC LOADING

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Amr Elsayed Mohammed Abdallah ◽  
Ehab Fathy El-Salakawy
Keyword(s):  
Aspect Ratio ◽  
Axial Load ◽  
Load Capacity ◽  
Load Level ◽  
Experimental Results ◽  
Rc Columns ◽  
Drift Capacity ◽  
Glass Fiber Reinforced ◽  
Axial Load Capacity ◽  
Code Provisions

The mechanical and physical properties of glass fiber-reinforced polymer (GFRP) reinforcement are different from steel, which requires independent code provisions for GFRP-reinforced concrete (RC) members. The currently available code provisions for GFRP-RC members still need more research evidence to be inclusive. For example, the available provisions for confinement reinforcement of FRP-RC columns do not consider the effects of column aspect ratio, which is not yet supported by any available research data. In this study, two full-scale spirally reinforced GFRP-RC circular columns were constructed and tested under concurrent seismic and axial loads. Both specimens had an aspect ratio (shear span-to-diameter ratio) of 7.0, while other two specimens with an aspect ratio of 5.0, from a previous stage of this study, were included for comparison purposes. For each aspect ratio, each specimen was loaded under one of two levels of axial load; 20 or 30% of the axial load capacity of the column section. All test specimens had a 35 MPa concrete compressive strength, 350-mm diameter, 85-mm spiral pitch and 1.2% longitudinal reinforcement ratio. The experimental results were analyzed in terms of hysteretic response, drift capacity and inelastic deformability hinge length. Based on the experimental results, it can be concluded that the aspect ratio affects the magnitude of secondary moments and inelastic deformability hinge length. In addition, the aspect ratio may affect drift capacity of GFRP-RC columns, depending on axial load level.

scholarly journals Modeling of the Axial Load Capacity of RC Columns Strengthened with Steel Jacketing under Preloading Based on FE Simulation

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Ahmed M. Sayed ◽  
Hesham M. Diab
Keyword(s):  
Axial Load ◽  
Failure Modes ◽  
Fe Simulation ◽  
Load Capacity ◽  
Three Dimensional ◽  
Fe Model ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Rc Columns ◽  
Axial Load Capacity

Reinforced concrete (RC) columns often require consolidation or rehabilitation to enhance their capacity to endure the loads applied. This paper aims at studying the conduct and capacity of RC square columns, those reinforced with steel jacketing under static preloads. For this purpose, a three-dimensional model of finite element (FE) is devised mainly to investigate and analyze the effect of this case. The model was tested and adjusted to ensure its accuracy using the previous experimental results obtained by the author. Results of testing, experimentally, the new developed FE model revealed the ability to use the model for calculating RC columns’ axial load capacity and for predicting accurate failure modes. The new model that tends to predict the axial load capacity was suggested considering the parametric analysis results.

scholarly journals Experimental and Numerical Investigations of Composite Concrete–Steel Plate Shear Walls Subjected to Axial Load

2019 ◽  
Vol 5 (11) ◽  
pp. 2402-2422 ◽  
Author(s):  
Jinan Laftah Abbas ◽  
Abbas A. Allawi
Keyword(s):  
Compressive Strength ◽  
Aspect Ratio ◽  
Axial Load ◽  
Steel Plate ◽  
Lateral Displacement ◽  
Load Capacity ◽  
Shear Walls ◽  
Axial Loads ◽  
Axial Load Capacity ◽  
Axial Shortening

This research is presented experimental and numerical investigations of composite concrete-steel plate shear walls under axial loads to predicate the effect of both concrete compressive strength and aspect ratio of the wall on the axial capacity, lateral displacement and axial shortening of the walls. The experimental program includes casting and testing two groups of walls with various aspect ratios. The first group with aspect ratio H/L=1.667 and the second group with aspect ratio H/L=2. Each group consists of three composite concrete -steel plate wall with three targets of cube compressive strength of values 39, 54.75 and 63.3 MPa. The tests result obtained that the increase in concrete compressive strength results in increasing the ultimate axial load capacity of the wall. Thus, the failure load, the corresponding lateral displacement and the axial shortening increased by increasing the compressive strength and the rate of increase  in failure load of the tested walls  was about (34.5% , 23.1%) as compressive strength increased from 39 to 63.3 MPa for case of composite wall  with aspect ratio H/L=1.667 and  H/L=2, respectively. The effect of increasing aspect ratio on the axial load capacity, lateral displacement and axial shortening of the walls was also studied in this study. Compared the main performance characteristic of the testing walls, it can be indicated that the walls with aspect ratio equal to (2) failed under lower axial loads as compared with walls with aspect ratio equal to 1.667 ratios by about (5.8, 12, 15.6 %) at compressive strength (39, 54.75, 63.3 MPa), respectively and experienced large flexural deformations. The mode of failure of all walls was characterized by buckling of steel plates as well as cracking and crushing of concrete in the most compressive zone. Nonlinear three-dimensional finite element analysis is also used to evaluate the performance of the composite wall, by using ABAQUS computer Program (version 6.13). Finite element results were compared with experimental results. The comparison shows good accuracy.

Axial load-capacity of rectangular cement stabilized rammed earth column

2015 ◽  
Vol 99 ◽  
pp. 402-412 ◽  
Author(s):  
Deb Dulal Tripura ◽  
Konjengbam Darunkumar Singh
Keyword(s):  
Axial Load ◽  
Load Capacity ◽  
Rammed Earth ◽  
Axial Load Capacity

Axial load capacity of cylindrical shells with local geometric defects

1991 ◽  
Vol 31 (2) ◽  
pp. 104-110 ◽  
Author(s):  
S. Krishnakumar ◽  
C. G. Foster
Keyword(s):  
Axial Load ◽  
Load Capacity ◽  
Cylindrical Shells ◽  
Axial Load Capacity

Magnetic Field and Specific Axial Load Capacity of Hybrid Magnetic Bearing

2013 ◽  
Vol 49 (8) ◽  
pp. 4911-4917 ◽  
Author(s):  
Haoze Wang ◽  
Kun Liu ◽  
Peng Ao
Keyword(s):  
Magnetic Field ◽  
Axial Load ◽  
Load Capacity ◽  
Magnetic Bearing ◽  
Axial Load Capacity
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