Experimental study of unloaded structural steel stay-cables under fire exposure

2020 ◽  
Author(s):  
Benjamin Nicoletta ◽  
Scott Watson ◽  
Bronwyn Chorlton ◽  
John Gales ◽  
Panagiotis Kotsovinos
Keyword(s):  
Experimental Study ◽  
Structural Steel ◽  
Fire Exposure ◽  
Stay Cables

Experimental Study of Fatigue Performance of Stay Cable Damper

2014 ◽  
Vol 487 ◽  
pp. 404-407
Author(s):  
Dong Liang ◽  
Zi Shuo Li
Keyword(s):  
Experimental Study ◽  
Good Condition ◽  
Experimental Results ◽  
Test Results ◽  
Stay Cable ◽  
Damping Force ◽  
Durability Test ◽  
Equivalent Damping ◽  
Stay Cables ◽  
Performance Deterioration

Oil dampers are widely used as a popular countermeasure to mitigate the stay cables vibration. In this study, one actual oil damper designed for some long cable-stayed was experimentally investigated to evaluate the durability. 4 million cycles loading, with frequency of 4 Hz and amplitude of 1 mm, was imposed on the damper. The excitation displacement and damping force were measured and the equivalent damping was calculated from the experimental results. The stiffness effects of dampers behaved during durability tests were also analyzed quantitatively. The test results showed that the dampers were still in good condition after 4 million cycles loading and the dampers temperatures were stable at 50 degree centigrade during the test. According to the durability test results, a model for performance deterioration of damper was proposed to predict the lifetime of oil dampers.

scholarly journals Experimental study of in-line heat treatment of 1.0577 structural steel

2018 ◽  
Vol 15 ◽  
pp. 1596-1603
Author(s):  
Milan Hnizdil ◽  
Martin Chabicovsky
Keyword(s):  
Heat Treatment ◽  
Experimental Study ◽  
Structural Steel

Experimental determination of the residual compressive strength of concrete columns subjected to different fire durations and load ratios

2020 ◽  
Vol 11 (4) ◽  
pp. 529-543
Author(s):  
Anjaly Nair ◽  
Osama (Sam) Salem
Keyword(s):  
Experimental Study ◽  
Compressive Strength ◽  
Reinforced Concrete ◽  
Concrete Columns ◽  
Fire Exposure ◽  
Fire Performance ◽  
Content Type ◽  
Residual Compressive Strength ◽  
Standard Fire ◽  
Strength Capacity

Purpose At elevated temperatures, concrete undergoes changes in its mechanical and thermal properties, which mainly cause degradation of strength and eventually may lead to the failure of the structure. Retrofitting is a desirable option to rehabilitate fire damaged concrete structures. However, to ensure safe reuse of fire-exposed buildings and to adopt proper retrofitting methods, it is essential to evaluate the residual load-bearing capacity of such fire-damaged reinforced concrete structures. The focus of the experimental study presented in this paper aims to investigate the fire performance of concrete columns exposed to a standard fire, and then evaluate its residual compressive strengths after fire exposure of different durations. Design/methodology/approach To effectively study the fire performance of such columns, eight identical 200 × 200 × 1,500-mm high reinforced concrete columns test specimens were subjected to two different fire exposure (1- and 2-h) while being loaded with two different load ratios (20% and 40% of the column ultimate design axial compressive load). In a subsequent stage and after complete cooling down, residual compressive strength capacity tests were performed on each fire exposed column. Findings Experimental results revealed that the columns never regain its original capacity after being subjected to a standard fire and that the residual compressive strength capacity dropped to almost 50% and 30% of its ambient temperature capacity for the columns exposed to 1- and 2-h fire durations, respectively. It was also noticed that, for the tested columns, the applied load ratio has much less effect on the column’s residual compressive strength compared to that of the fire duration. Originality/value According to the unique outcomes of this experimental study and, as the fire-damaged concrete columns possessed considerable residual compressive strength, in particular those exposed to shorter fire duration, it is anticipated that with proper retrofitting techniques such as fiber-reinforced polymers (FRP) wrapping, the fire-damaged columns can be rehabilitated to regain at least portion of its lost load-bearing capacities. Accordingly, the residual compressive resistance data obtained from this study can be effectively used but not directly to adopt optimal retrofitting strategies for such fire-damaged concrete columns, as well as to be used in validating numerical models that can be usefully used to account for the thermally-induced degradation of the mechanical properties of concrete material and ultimately predict the residual compressive strengths and deformations of concrete columns subjected to different load intensity ratios for various fire durations.

Experimental Study of Vibration Mitigation of Bridge Stay Cables

1999 ◽  
Vol 125 (9) ◽  
pp. 977-986 ◽  
Author(s):  
Y. L. Xu ◽  
S. Zhan ◽  
J. M. Ko ◽  
Z. Yu
Keyword(s):  
Experimental Study ◽  
Vibration Mitigation ◽  
Stay Cables

scholarly journals EXPERIMENTAL STUDY ON FRACTURE TOUGHNESS OF HIGH-STRENGTH STRUCTURAL STEEL AND ITS BUTT WELD

2015 ◽  
pp. 440-451
Author(s):  
Yuanqing Wang ◽  
◽  
Xiyue Liu ◽  
Yun Lin ◽  
Yongjiu Shi ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Experimental Study ◽  
Structural Steel ◽  
High Strength ◽  
Butt Weld
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