Revisiting the Effect of Axial Force Ratio on the Seismic Behaviour of RC Building Columns

2017 ◽  
Vol 27 (1) ◽  
pp. 88-100
Author(s):  
Terry Y. P. Yuen ◽  
J. S. Kuang
Keyword(s):  
Axial Force ◽  
Seismic Behaviour ◽  
Force Ratio ◽  
Rc Building

Optimization on the Performance of a Precision Flank-Locking Locknut Considering the Machining and Operational Parameters

2017 ◽  
Vol 35 (1) ◽  
pp. 41-49 ◽  
Author(s):  
C. M. Chen ◽  
C. Y. Lee
Keyword(s):  
Taguchi Method ◽  
Axial Force ◽  
Machining Process ◽  
Average Error ◽  
Optimized Design ◽  
Control Parameters ◽  
Operational Parameters ◽  
Machining Processes ◽  
Tightening Torque ◽  
Force Ratio

AbstractIn this study, the anti-loosening characteristics of a precision flank-locking locknut fabricated under various machining processes and tested in different dynamic environments were investigated. The control parameters considered include the tightening torque and thread pitch of the set screw, machining process on the end plane of locknut, and vibration amplitude and frequency of dynamic loading in service, etc. Their sensitivities on the axial force ratio and anti-loosening ratio of the locknut were evaluated using Taguchi method. It was found that the pretension of locknut, the tightening torque and the pitch of set screw, and the machining process of the nut's end plane were the significant control parameters for the anti-loosening performance of the locknut. Moreover, the results of experimental measurements were employed in the regression fit on the performance of the locknut. The regression model was able to predict the anti-loosening ratio with 4.42% average error comparing with the measurements. Furthermore, the optimized design of the locknut through the Taguchi method was able to increase the axial force ratio and anti-loosening ratio by 20.4% and 16.8%, respectively, comparing with standard locknut.

The Influence of Corrosion on the Anti-Loosening Performance of a Precision Locknut Subjected to Rotation and Periodic Impact

2019 ◽  
Vol 36 (3) ◽  
pp. 295-303 ◽  
Author(s):  
C. M. Chen ◽  
H. L. Chang ◽  
C. Y. Lee
Keyword(s):  
Machine Tool ◽  
Real Time ◽  
Axial Force ◽  
Contact Surface ◽  
Nacl Solution ◽  
Transverse Impact ◽  
Dynamic Impact ◽  
Force Ratio ◽  
Design And Manufacturing ◽  
Impact Tester

ABSTRACTThe influence of combined corrosion and vibration to the anti-loosening performance of a precision locknut used in a machine tool is investigated. Firstly, the locknut was submerged in 5% NaCl solution according to ASTM B895 standard for corrosion testing. The locknuts, after submerged in 1-hr, 2-hr and 4-hr periods, respectively, were then installed on the rotating spindle in a vertical dynamic impact tester for performing anti-loosening test. The initial installed pretension was 9800 N and the spindle was rotating in a constant speed of 1000 rpm. Turmogrease Li 802 EP lubricant was used on the contact surface between spindle thread and locknut. The set screws on the locknut were tightened sequentially and evenly in three-stage of torque: 1.96 N-m, 3.92 N-m and 5.88 N-m. Its real-time pretension variation with the periodic transverse impact and its final loosening torque were measured. Accordingly, the axial force ratio and anti-loosening torque ratio were calculated and discussed. It was found that corrosion treatment had similar influence on both the axial force ratio and the anti-loosening torque ratio. More corrosion on the locknut with longer submersion in NaCl solution deteriorated its anti-loosening characteristics. The result could serve as the reference for evaluating the fastening performance of precision locknut and guide the design and manufacturing for the application improvement.

Effects of Outrigger Truss Systems on Collapse Initiation Times of High-Rise Towers Exposed to Fire

2011 ◽  
Vol 82 ◽  
pp. 344-349
Author(s):  
Daigoro Isobe ◽  
Thi Thai Thanh Le
Keyword(s):  
Axial Force ◽  
Joint Strength ◽  
Structural Parameters ◽  
Progressive Collapse ◽  
Strength Ratio ◽  
Initiation Time ◽  
Structural Vulnerability ◽  
High Rise ◽  
Load Paths ◽  
Force Ratio

In this paper, progressive collapse analyses were performed on a 30-story, seven-span tower that was exposed to fire. The Adaptively Shifted Integration (ASI)-Gauss technique was used to demonstrate the effects of fire patterns and structural parameters on collapse initiation time: the duration from the beginning of the fire until collapse initiation. Specifically, an outrigger truss system was placed on the roof of a model, and the influence of the system on the structural vulnerability of the tower was verified. The structural parameters that were varied in the analyses included the axial force ratio, the member joint strength ratio and the member strength ratio of the outrigger trusses to the strength of the beams on the first floor. From the numerical results, it is confirmed that collapse initiation times are significantly affected by the member joint strength ratio if the axial force ratio is small (floor loads are low) on the condition that the fire pattern is nearly symmetrical, and the load paths to and from the outrigger truss system are sufficiently protected.

Limit of axial force ratio and requirement for stirrups of RC columns with special shape

2007 ◽  
Vol 1 (2) ◽  
pp. 176-181
Author(s):  
Yiqun Wang ◽  
Yidong Xu ◽  
Yanjing Zhao ◽  
Yunxia Chen
Keyword(s):  
Axial Force ◽  
Special Shape ◽  
Rc Columns ◽  
Force Ratio

Experimental Study on Seismic Behavior of Steel-Plate Reinforced Concrete Shear Wall with Rectangular CFST Columns

2012 ◽  
Vol 446-449 ◽  
pp. 370-377
Author(s):  
Jian Wei Zhang ◽  
Wan Lin Cao ◽  
Hong Ying Dong
Keyword(s):  
Reinforced Concrete ◽  
Axial Force ◽  
Seismic Behavior ◽  
Steel Plate ◽  
Shear Wall ◽  
Steel Tube ◽  
Force Ratio ◽  
Hysteretic Characteristics ◽  
Cfst Columns ◽  
Composite Shear

The steel-plate reinforced concrete shear wall with rectangular concrete filled steel tube (CFST) columns is a new kind of composite shear wall. In order to ascertain its seismic behavior and failure mechanism, four 1/5 scale specimens with the same shear span ratio 1.5, different thickness of the steel-plate and different axial force ratio, were tested under horizontal cyclic loading. The thickness of steel-plate in the walls is 2mm, 4mm, 4mm and 6mm, respectively. Based on the experiment, the load-bearing capacity, hysteretic characteristics, ductility, stiffness degradation, energy dissipation capacity and failure mode of the specimens were contrastively analyzed. And the effect of the ratio of height to sectional thickness of steel-plate and the value changes of axial force ratio on seismic behavior of the new shear wall was also analyzed. The result shows that the steel-plate reinforced concrete shear wall with rectangular CFST columns has good seismic performance and important engineering value.

scholarly journals Seismic Behaviour of RC Building with Raft Foundation in the Ganges Basin, India

2020 ◽  
Vol 118 (5) ◽  
pp. 759
Author(s):  
J. S. Rajeswari ◽  
Rajib Sarkar ◽  
Sekhar Chandra Dutta ◽  
Jai Prakash Singh ◽  
Ranjeet Saw
Keyword(s):  
Seismic Behaviour ◽  
Ganges Basin ◽  
Raft Foundation ◽  
Rc Building ◽  
The Ganges

scholarly journals Seismic Effect of Regular and Irregular RC Building with and Without Infill Frames using ETABS

2020 ◽  
Vol 8 (5) ◽  
pp. 2203-2207
Keyword(s):  
Lateral Displacement ◽  
Pushover Analysis ◽  
Seismic Loading ◽  
Seismic Effect ◽  
Rc Buildings ◽  
Seismic Behaviour ◽  
Normal Frame ◽  
Rc Building ◽  
Better Than

This work is on the seismic behaviour of regular and irregular RC buildings with and without infill frames. It's below stood that buildings that are regular in plan (regular building) perform far better than those which have irregularity in plan (irregular building) under seismic loading. Irregularities don't seem to be avoidable in construction of buildings. This method of analysis is projected in terms of equivalant statics, responce spectrum and pushover analysis consistant with IS 1893:2002(part 1) code. Results of those analyses are mentioned in terms of the bottom construction drift and storey stiffness. From these results it's finished that laterel displacement and construction drift are going to be a lot of in vacant frame compare with the infill frames, whereas the bottom shear are going to be less in normal frame compare with the infill frames. It is also observed that lateral displacement and story drifts are more in irreguler buildings than reguler buildings.

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