Numerical models and parametric study on ultimate strength of CHS T-joints subjected to brace axial compression under fire condition

2010 ◽  
pp. 733-740 ◽  
Author(s):  
M Nguyen ◽  
K Tan ◽  
T Fung
Keyword(s):  
Ultimate Strength ◽  
Axial Compression ◽  
Parametric Study ◽  
Numerical Models ◽  
T Joints ◽  
Fire Condition

Strengthening CHS T-joints subjected to brace axial compression using through-bolts

2017 ◽  
Vol 128 ◽  
pp. 555-566 ◽  
Author(s):  
Mina S. Iskander ◽  
Amr A. Shaat ◽  
Ezzeldin Y. Sayed-Ahmed ◽  
Emam A. Soliman
Keyword(s):  
Axial Compression ◽  
T Joints

The effect of contouring the connecting bar in an acrylic-pin external fixator

2001 ◽  
Vol 14 (04) ◽  
pp. 190-195 ◽  
Author(s):  
E. L. Egger ◽  
G. D. Herndon
Keyword(s):  
Ultimate Strength ◽  
Axial Compression ◽  
External Fixator ◽  
Testing Machine ◽  
Biomechanical Testing ◽  
Catastrophic Failure ◽  
High Stiffness

This studies the effects of contouring of acrylic column when placed in axial compression. Six different angles were studied, 0°, 30°, 45°, 60°, 90° and a 90° with a 2.0 mm connecting bar. Each column was then placed under axial compression using a biomechanical testing machine. As the angle of the contour increased there was a significant decrease in the ultimate stiffness and ultimate strength of the columns. However, the amount of force required to cause catastrophic failure in any of the group was still high (stiffness 300 N/mm ± 70, ultimate strength 1032 N ± 139) which may not be reached in a physiological setting. When using a severe angulation of the column the using of a connecting bar will significantly increase both stiffness and strength of the acrylic.

scholarly journals Experimental and Numerical Seismic Evaluation of RC Walls Under Axial Compression

2020 ◽  
Author(s):  
Tahir Mehmood ◽  
Ahsen Maqsoom ◽  
Adnan Nawaz ◽  
Badar-Ul Ali Zeeshan
Keyword(s):  
Shear Strength ◽  
Axial Compression ◽  
Axial Load ◽  
Numerical Models ◽  
Response Prediction ◽  
Accurate Estimate ◽  
Seismic Evaluation ◽  
Compression Load ◽  
High Rise ◽  
Experimental Findings

Recent studies show that code-based equations usually do not provide an accurate estimate for the shear strength of short reinforced concrete (RC) walls due to the negligence of many important factors including the beneficial effect of axial compression. In the current study, quasi-static reversed cyclic testing is conducted for two RC wall specimens, one under axial load and one without axial load to assess the effect of the axial compression on the shear strength of RC walls in high-rise buildings. The results of the experimental study show that the axial compression load significantly improves the shear strength of RC walls. Results are also compared with the performance-based seismic evaluation code practices. Based on the experimental findings, recommendations are made for improvements in the existing codes. The experimental results are further compared with different numerical models to explore the suitable computer modeling options for non-linear response prediction of RC walls.

Axial strength of steel circular hollow section (CHS) X-joints strengthened by flanged larger pipe

2020 ◽  
Vol 47 (3) ◽  
pp. 301-316
Author(s):  
Peter Gerges ◽  
Sameh Gaawan ◽  
Ashraf Osman
Keyword(s):  
Finite Element ◽  
Parametric Study ◽  
Thickness Ratio ◽  
Finite Element Models ◽  
T Joints ◽  
Hollow Section ◽  
Axial Strength ◽  
Structural Joints ◽  
Circular Hollow Section ◽  
Steel Design

In steel design, enhancing the structural joints’ capacity is considered a challenge that faces the designer. This challenge becomes more difficult when it comes to enhancing the capacities of circular hollow section (CHS) joints due to their closed nature that complicates the strengthening process. Recent research related to strengthening T-joints by utilizing two outer hollow ring flanges welded to additional pipe showed that this technique can significantly improve the joints’ strength. In this study, the utilization of this technique is extended for enhancing the axial strength of CHS X-joints. In this regard, a parametric study using finite element models was carried out to investigate the different design aspects that might affect the behavior of strengthened X-joints. The examined parameters included, the ring flange diameter, the stiffening pipe thickness and length for different brace diameter-to-chord diameter ratios and chord diameter to double chord thickness ratio. The results demonstrated that these strengthened X-joints gained significant axial strength that reached up to three times the axial strength of the unstrengthened joints. Guidelines for proper detailing of such strengthening scheme were provided. Finally, an equation that estimates the axial strength of strengthened joints was established based on the achieved results.

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