The effects of axial deformation and axial force on vibration characteristics of tall buildings

2002 ◽  
Vol 11 (5) ◽  
pp. 309-328 ◽  
Author(s):  
S. Swaddiwudhipong ◽  
S. Soelarno Sidji ◽  
S.-L. Lee
Keyword(s):  
Axial Force ◽  
Tall Buildings ◽  
Vibration Characteristics ◽  
Axial Deformation

scholarly journals Use of vibration characteristics to predict the axial deformation of columns

2014 ◽  
Vol 50 (1) ◽  
pp. 73-88 ◽  
Author(s):  
H.N. Praveen Moragaspitiya ◽  
David P. Thambiratnam ◽  
Nimal J. Perera ◽  
Tommy H.T. Chan
Keyword(s):  
Vibration Characteristics ◽  
Axial Deformation

Feasibility Analysis of Reverse Sealed Testing String in HPHT Wells

2014 ◽  
Vol 556-562 ◽  
pp. 2761-2764
Author(s):  
Bao Kui Gao ◽  
Wei Wang ◽  
Xing Qin
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Axial Force ◽  
New Technology ◽  
Feasibility Analysis ◽  
Well Testing ◽  
Axial Deformation ◽  
High Pressure High Temperature ◽  
Key Factor ◽  
Testing Design

To solve problems met in an offshore High-Pressure High-Temperature (HPHT) well testing, a new technology is put forward—placing seal bore extension above permanent packer, and the upper landing tools being connected with seal bore extension through shear pins. This method gives a reverse position of seal bore extension compared with conventional way in which seal bore extension is below permanent packer. So, the feasibility must be considered. Two technological procedures, testing before cutting pins and testing after cutting pins, are discussed, and the highlight is on axial force and deformation of testing string at crucial moments. Results indicate that this new technology is feasible. Of the two technological procedures, axial force is the key factor when testing before cutting pins and axial deformation is the key factor when testing after cutting pins. Conclusions have been used in an offshore HPHT well testing design.

Analysis of Axial Deformation of Cross Wedge Rolling Asymmetric Shaft Part Based on Finite Element Method

2011 ◽  
Vol 101-102 ◽  
pp. 396-399
Author(s):  
Xue Dao Shu ◽  
Le Ping Chen ◽  
Xin Hong Wei
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Axial Force ◽  
Theoretical Foundation ◽  
Tangential Force ◽  
Axial Displacement ◽  
Axial Deformation ◽  
Cross Wedge Rolling ◽  
Axial Movement ◽  
Element Method

Aimed at preventing the problems of axial movement, step blemish and rolling overlap piece of skins which make from the imbalance of axial and tangential force because of asymmetry of parts in size and shape, the paper adopted finite element method (FEM) to simulate CWR technique of typical asymmetric shaft part, and analysis systematically axial force and axial displacement. Then we can judge axial offset by axial displacement of central point of billet. The results of the study indicate that FEM can manifest the axial deformation of asymmetric shaft parts in CWR, which provides theoretical foundation for the promotion of CWR technology in the application of asymmetric shaft parts manufacture.

The vibration characteristics of a beam with an axial force

1978 ◽  
Vol 59 (2) ◽  
pp. 237-244 ◽  
Author(s):  
R.E.D. Bishop ◽  
W.G. Price
Keyword(s):  
Axial Force ◽  
Vibration Characteristics

Experimental investigation on coupled vibration characteristics of wind-excited tall buildings

2020 ◽  
Vol 23 (9) ◽  
pp. 1948-1959
Author(s):  
Wei Hao ◽  
Qingshan Yang
Keyword(s):  
Fourier Transform ◽  
Wind Speed ◽  
Complex Geometry ◽  
Damping Ratio ◽  
Time History ◽  
Tall Buildings ◽  
Vibration Characteristics ◽  
Coupled Vibration ◽  
Coupled Response ◽  
Standard Deviations

Contemporary tall buildings constructed with high-strength and light-weight materials become relatively flexible and lightly damped, and the fluctuating wind forces acting on the buildings may cause excessive vibrations, especially at the vicinity of vortex lock-in wind speed, where the natural frequency of the buildings is synchronized with the vortex shedding frequency. Given that tall buildings tend to be designed with unconventional shape involving innovative structural systems and complex geometry, the correlations among three force components may accentuate building motions significantly. In this study, the coupling characteristics between the alongwind and crosswind vibrations of tall buildings with symmetric shape and distinct natural frequencies in two directions are investigated through a serious of aeroelastic model tests. The response standard deviations and power spectral densities are calculated, respectively, based on the displacement data measured at multiple levels of wind speed and structural damping ratio. Then the coupled response is extracted from the alongwind response in frequency domain through Fourier transform and inverse Fourier transform, and the standard deviations of the coupled response are calculated based on time history analysis, which are compared with that of the crosswind response to investigate the relationship between the alongwind and crosswind motions. Moreover, the amplitude ratio, phase difference, and coherence of the response components are also calculated for further discussing the coupling effects and examining the coupled vibration characteristics.

Effect of axial deformation on vibration of tall buildings

2001 ◽  
Vol 10 (2) ◽  
pp. 79-91 ◽  
Author(s):  
Somsak Swaddiwudhipong ◽  
Seng-Lip Lee ◽  
Qin Zhou
Keyword(s):  
Tall Buildings ◽  
Axial Deformation

Research on Mechanical Performance of an Irregular Kiewitt Dome Structure

2013 ◽  
Vol 639-640 ◽  
pp. 171-176
Author(s):  
Qing Jun Chen ◽  
Ying Rui Chen ◽  
Guang Bin Pan ◽  
Yi Qun Zhang ◽  
Zheng Rong Jiang
Keyword(s):  
Nonlinear Analysis ◽  
Axial Force ◽  
Parametric Analysis ◽  
Mechanical Performance ◽  
Vibration Characteristics ◽  
Force Distribution ◽  
Spatial Structures ◽  
Buckling Modes ◽  
Dome Structure ◽  
Beam Section

Kiewitt dome structure is commonly used in spatial structures, on which many researches have been carried out. However, few researches focus on irregular dome structure. The mechanical performance of an irregular Kiewitt dome structure, cut by two vertical planes from a semi-sphere dome structure to form two openings supported by beams for architectural gates, is studied. The analysis and comparison of the dome structures with the opening or not, as well as the parametric analysis of section of the supporting beam, are conducted by SAP2000. Finally, nonlinear analysis is done by ANSYS. The results show that the existence of openings decreases the integrity of the structure and the members near the opening need to be strengthened. The stiffness of the arch beam has great effects on the vibration characteristics, the axial force distribution of the members, and the buckling modes of the structure. Proper arch beam section is recommended to meet the requirement of the structure.

Study of Vibration Instability of TTR With Varying Axial Force and Tension Ring

2012 ◽  
Author(s):  
You-gang Tang ◽  
Wei-dong Shao
Keyword(s):  
Boundary Condition ◽  
Axial Force ◽  
Deep Water ◽  
Parametric Excitation ◽  
Mode Coupling ◽  
Floquet Theory ◽  
Vibration Characteristics ◽  
Vibration Response ◽  
Parametric Stability ◽  
Heave Motion

The parametric-excitation vibration characteristics are investigated considering the tension-ring’s effect and mode coupling of riser. The Floquet theory is used to study the parametric stability of deep-water risers as the top boundary condition is pinned or moving with or without damping. The effect of frequency and the amplitude of heave motion on the riser vibration response are studied considering the effect of mode coupling.

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