Experimental Investigation Into the Behaviour of a New Replaceable Bracing System

2012 ◽  
Author(s):  
S. V. Khonsari ◽  
G. L. England ◽  
M. Moradi ◽  
H. Farahani ◽  
D. Zarei
Keyword(s):  
Experimental Investigation ◽  
Axial Loading ◽  
Repair Capacity ◽  
Bending Capacity ◽  
Potential Damage ◽  
Bracing System ◽  
Eccentric Bracing ◽  
Floor System ◽  
New System

A new bracing system with new features somewhat different from those of the existing ones was devised and is presented. These features comprise some of the advantages of eccentric bracing systems including their ability to dissipate energy through bending of flexural elements while lacking some of the disadvantages of such systems including their inability of being replaced upon damage during events such as earthquakes, etc. While in traditional types of braces, including both concentric and eccentric ones, braces are under axial loading, in this new system they work in a bending capacity. As a result, the sort of flexibility which is introduced in the system in the presence of eccentric braces (definitely at the price of forcing the potential damage to occur and be concentrated at the girders/beams to which such braces are connected), is now provided by the braces and at the price of sacrificing them. Therefore, if the level of damage is such that the damaged element is no longer usable, the replacement of the braces is a more viable and economically justifiable than that of the girders. Moreover, since girders, as part of the deck/floor system, are normally engaged with other elements such as stringers/joists, their replacement may not be practically possible at all. Such bracing systems, called Broken Beam Bracing System (BBBS), have the potential of being used in offshore/onshore structures as originally-used elements or in a retrofit/repair capacity.

Effect of Sintering Schedule to the Alloyability of FeCrAl Powder Mix Formed at above Ambient Temperature

2015 ◽  
Vol 1115 ◽  
pp. 199-202
Author(s):  
Mujibur M. Rahman ◽  
A.A.A. Talib
Keyword(s):  
Experimental Investigation ◽  
Elevated Temperature ◽  
Ambient Temperature ◽  
Axial Loading ◽  
Xrd Analysis ◽  
Compaction Process ◽  
Argon Gas ◽  
Fecral Alloy ◽  
Powder Mass ◽  
Die Compaction

This paper presents the outcomes of an experimental investigation on the effect of sintering schedule to the alloyability of FeCrAl powder mix formed through warm powder compaction process. A lab-scale uni-axial die compaction rig was designed and fabricated which enabled the compaction of powder mass at elevated temperature. Iron (Fe) powder ASC 100.29 was mechanically mixed with other alloying elements, namely chromium (Cr), and aluminum (Al) for 60 minutes and compacted at 150°C by applying 130 kN axial loading to generate green compacts. The defect-free green compacts were subsequently sintered in an argon gas fired furnace for different holding times. The sintered samples were then undergone XRD analysis. The results revealed that the alloyability of sintered products were affected by the holding time during sintering. The sample sintered at 800°C for 60 minutes showed the highest intensity of FeCrAl alloy.

Experimental Investigation of Steel Lap Welded Pipe Joint Performance under Severe Axial Loading Conditions in Seismic or Geohazard Areas

2020 ◽  
Author(s):  
Brent D. Keil ◽  
Gregory Lucier ◽  
Spyros A. Karamanos ◽  
Richard D. Mielke ◽  
Fritz Gobler ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Axial Loading ◽  
Loading Conditions ◽  
Joint Performance ◽  
Welded Pipe ◽  
Pipe Joint

Serviceability of a New Kind of Precast Hollow Cross-Grids Floor System

2017 ◽  
Vol 873 ◽  
pp. 158-163
Author(s):  
Wen Xiao Cui ◽  
Zhong Fan Chen ◽  
Wan Yun Yin ◽  
Shou Cheng Liu
Keyword(s):  
Experimental Investigation ◽  
Fem Analysis ◽  
Grid Floor ◽  
Experimental Results ◽  
Dynamic Force ◽  
Peak Acceleration ◽  
Large Span ◽  
Vibration Serviceability ◽  
Crowd Effect ◽  
Floor System

This paper proposed a new kind of precast hollow cross-grid floor system which is fabricated by several precast panels and post-poured concrete strips. As there is a lack of data related to the vibration serviceability of this new floor system which aim at being used in the large-span buildings, an experimental investigation was conducted. The data obtained from the experiment showed the new floor system meet existing China criteria under most pedestrian excitations. The resultsalso demonstrated thepacing rate influence the vibration performances most as the crowd effect least. Then the FEM analysis was taken to predict the peak acceleration of the new kind of floor system comparing to the experimental results using different coefficient of dynamic force.

scholarly journals Effect of the Bracing System on the Probability of Collapse of Steel Structures under Maximum Credible Earthquake

2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Alireza Kianmehr
Keyword(s):  
Residential Buildings ◽  
Hazard Analysis ◽  
Fragility Curves ◽  
Steel Structures ◽  
Structural Members ◽  
Braced Frame ◽  
Ductile Behavior ◽  
Bracing System ◽  
Eccentric Bracing ◽  
Different Characteristics

Simple bracing frames can be divided into two types in terms of concentric or eccentric. Concentric bracing frames are frames that intersect with other structural members at one point in the structure along the bracing members. Otherwise, the braced frame will be eccentric. It is said empirically that due to this type of shaping, eccentric bracing frames exhibit more ductile behavior and concentric bracing frames exhibit more stiff behavior. This behavioral difference caused this study to be numerically computing for five frames, including unique concentric and eccentric bracing frames of 5 and 10 stories and an ordinary 5-story concentric bracing frame. Their tensions and drift ratios should be acceptable for the use of residential buildings. Using the primary two steps of the new PEER probabilistic framework, namely, probabilistic seismic hazard analysis and structural analysis, which leads to the drawing of fragility curves, the probability of collapse is obtained to compare the safety capability of these frames according to their different characteristics against earthquakes. The results show that increasing the ductility or increasing the number of floors or the height of these systems can reduce collapse. Also, according to the results of the probability of collapse obtained in frames with 5-story concentric bracing frames, it can be said that some of the current regulations, which work based on previous approaches of analysis, can lead to unsafe structures with a high probability of collapse.

Size Effect of Concrete Compressive Strength with Different Reinforcement Ratio

2008 ◽  
Vol 400-402 ◽  
pp. 837-841
Author(s):  
Jie Su ◽  
Zhi Fang
Keyword(s):  
Experimental Investigation ◽  
Compressive Strength ◽  
Size Effect ◽  
Axial Loading ◽  
Reinforcement Ratio ◽  
Concrete Compressive Strength ◽  
Concrete Prism ◽  
Strength Grade

An experimental investigation is reported into the size effect for compressive strength from 36 concrete prism specimens under axial loading and with three different kinds of dimensions of 100×100×300mm, 150×150×300mm, 200×200×400mm. Such parameters as strength grade of concrete and reinforcement ratio are taken into consideration. Three different strength grades of concrete and two different reinforcement ratio are included in those specimens, all tests are undertaken according to ASTM C 39/C 39M-2005. Based on the results obtained, a new size effect law for different kinds of concrete in prismatical compressive strength is suggested and those relative parameters on the size effect are discussed.

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