Laboratory observation on the seismic response of the filled joint under high amplitude stress waves

2016 ◽  
pp. 117-122
Author(s):  
X Huang ◽  
S Qi ◽  
K Xia
Keyword(s):  
Seismic Response ◽  
High Amplitude ◽  
Stress Waves ◽  
Laboratory Observation ◽  
Filled Joint

scholarly journals Numerical Simulation on Seismic Response of the Filled Joint under High Amplitude Stress Waves Using Finite-Discrete Element Method (FDEM)

Materials ◽  
2016 ◽  
Vol 10 (1) ◽  
pp. 13 ◽  
Author(s):  
Xiaolin Huang ◽  
Qi Zhao ◽  
Shengwen Qi ◽  
Kaiwen Xia ◽  
Giovanni Grasselli ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Discrete Element Method ◽  
Seismic Response ◽  
Discrete Element ◽  
High Amplitude ◽  
Stress Waves ◽  
Filled Joint ◽  
Element Method

Effects of Fling Step and Forward Directivity on Seismic Response of Buildings

2006 ◽  
Vol 22 (2) ◽  
pp. 367-390 ◽  
Author(s):  
Erol Kalkan ◽  
Sashi K. Kunnath
Keyword(s):  
Seismic Response ◽  
Ground Motions ◽  
High Amplitude ◽  
Moment Frames ◽  
Steel Moment Frames ◽  
Damage Potential ◽  
Near Fault ◽  
Forward Directivity ◽  
Fling Step ◽  
Far Fault

This paper investigates the consequences of well-known characteristics of near-fault ground motions on the seismic response of steel moment frames. Additionally, idealized pulses are utilized in a separate study to gain further insight into the effects of high-amplitude pulses on structural demands. Simple input pulses were also synthesized to simulate artificial fling-step effects in ground motions originally having forward directivity. Findings from the study reveal that median maximum demands and the dispersion in the peak values were higher for near-fault records than far-fault motions. The arrival of the velocity pulse in a near-fault record causes the structure to dissipate considerable input energy in relatively few plastic cycles, whereas cumulative effects from increased cyclic demands are more pronounced in far-fault records. For pulse-type input, the maximum demand is a function of the ratio of the pulse period to the fundamental period of the structure. Records with fling effects were found to excite systems primarily in their fundamental mode while waveforms with forward directivity in the absence of fling caused higher modes to be activated. It is concluded that the acceleration and velocity spectra, when examined collectively, can be utilized to reasonably assess the damage potential of near-fault records.

Laser generation of high‐amplitude stress waves in materials

1979 ◽  
Vol 50 (3) ◽  
pp. 1497-1502 ◽  
Author(s):  
B. P. Fairand ◽  
A. H. Clauer
Keyword(s):  
High Amplitude ◽  
Stress Waves ◽  
Laser Generation

The seismic response of sediment-filled valleys. Part 2. The case of incident P and SV waves

1980 ◽  
Vol 70 (5) ◽  
pp. 1921-1941
Author(s):  
Pierre-Yves Bard ◽  
Michel Bouchon
Keyword(s):  
Seismic Response ◽  
Rayleigh Waves ◽  
High Amplitude ◽  
Ground Shaking ◽  
Resonance Modes ◽  
Long Duration ◽  
Time Domains ◽  
P And Sv Waves ◽  
Lateral Resonance ◽  
Main Component

abstract We present the extension to incident P and SV waves of our previous study (Bard and Bouchon, 1980) concerning the seismic response of sediment-filled bidimensional valleys to incident SH transient signals. The reliability of the Aki-Larner method is briefly discussed and the domain is estimated within which it provides accurate results. Then we investigate the response of three different valleys, having various geometrical and elastic parameters, to vertically incident P and SV waves, in both the frequency and time domains. The behavior of the valleys is shown to be qualitatively similar to their behavior for SH waves: the nonplanar interface causes surface waves (here Rayleigh waves) to be generated on valley edges, and to propagate laterally inside the basin. The amplitude of these Rayleigh waves depends greatly on the velocity contrast, the valley shape, and the incident wave type (P or SV), but it may be significantly higher than the disturbance associated with the direct incident signal. The frequency and direction of incident motion determine partly whether the fundamental or first higher mode will be predominantly excited, depending on the main component (vertical or horizontal) of the Rayleigh mode motion. Although the reflections of these Rayleigh waves on valley edges do not appear as clearly as in the SH case, a very long duration of the ground shaking inside the valley is still observed. In deep valleys, these laterally propagating Rayleigh waves may degenerate into a lateral resonance pattern, involving high-amplitude surface motion. These latter resonance modes, however, begin to appear in shallower valleys for incident SV waves than for incident P ones.

scholarly journals Dynamic Response and Fracture of Composite Gun Tubes

2001 ◽  
Vol 8 (3-4) ◽  
pp. 229-238 ◽  
Author(s):  
Jerome T. Tzeng
Keyword(s):  
Fatigue Life ◽  
Dynamic Response ◽  
Material Properties ◽  
Fracture Behavior ◽  
High Amplitude ◽  
Critical Value ◽  
Stress Waves ◽  
Cyclic Stresses ◽  
Dynamic Amplification ◽  
Very High

The fracture behavior due to dynamic response in a composite gun tube subjected to a moving pressure has been investigated. The resonance of stress waves result in very high amplitude and frequency strains in the tube at the instant and location of pressure front passage as the velocity of the projectile approaches a critical value. The cyclic stresses can accelerate crack propagation in the gun tube with an existing imperfection and significantly shorten the fatigue life of gun tubes. The fracture mechanism induced by dynamic amplification effects is particularly critical for composite overwrap barrels because of a multi-material construction, anisotropic material properties, and the potential of thermal degradation.

Propagation of high amplitude stress waves through a filled artificial joint: An experimental study

2016 ◽  
Vol 130 ◽  
pp. 1-7 ◽  
Author(s):  
Xiaolin Huang ◽  
Shengwen Qi ◽  
Kaiwen Xia ◽  
Hong Zheng ◽  
Bowen Zheng
Keyword(s):  
Experimental Study ◽  
High Amplitude ◽  
Stress Waves ◽  
Artificial Joint

Effect of Elastomeric Snubber Properties on Seismic Response of Vibration-Isolated Mechanical Equipment: An Experimental Study

2008 ◽  
Vol 24 (2) ◽  
pp. 387-403 ◽  
Author(s):  
Saeed Fathali ◽  
André Filiatrault
Keyword(s):  
Seismic Response ◽  
Contact Surface ◽  
High Amplitude ◽  
Relative Displacement ◽  
Mechanical Equipment ◽  
Gap Size ◽  
Displacement Response ◽  
Dynamic Forces ◽  
Centrifugal Chiller ◽  
Input Motion

Earthquake-simulator experiments were conducted on a liquid centrifugal chiller supported by four isolation/restraint systems with built-in elastomeric snubbers. The test plan incorporated variations of input motion amplitudes and snubber properties to investigate their effect on three response quantities: peak dynamic forces induced into the snubbers, peak acceleration, and peak relative displacement response of the equipment. The elastomeric snubbers limited the displacement responses of the vibration-isolated equipment at the expense of excessive dynamic forces and amplification of the equipment acceleration response. The snubber gap size was the most influential property on the response quantities. For high-amplitude input motions, all the response quantities increased with an increase of the gap size. Due to the compressibility of the snubber elastomeric contact-surface, the actual gap size was always larger than the nominal gap size. Even with a nominal gap size less than 0.25 in., the seismic response of the equipment was substantially different from the seismic response of rigidly mounted equipment. Compared to snubbers with constant contact-surface, snubbers with expanding contact-surface resulted in lower dynamic forces. The thicker and softer contact-surface could lower the dynamic forces induced into the snubbers but resulted in larger relative displacement response of the equipment.

scholarly journals Elastic–Plastic Wave Propagation in Uniform and Periodic Granular Chains

2015 ◽  
Vol 82 (8) ◽  
Author(s):  
Hayden A. Burgoyne ◽  
Chiara Daraio
Keyword(s):  
Wave Propagation ◽  
Hopkinson Bar ◽  
High Amplitude ◽  
Pulse Velocity ◽  
Stress Waves ◽  
Laser Vibrometer ◽  
Particle Properties ◽  
Elastic Plastic ◽  
Rate Dependent ◽  
Granular Chains

We investigate the properties of high-amplitude stress waves propagating through chains of elastic–plastic particles using experiments and simulations. We model the system after impact using discrete element method (DEM) with strain-rate dependent contact interactions. Experiments are performed on a Hopkinson bar coupled with a laser vibrometer. The bar excites chains of 50 identical particles and dimer chains of two alternating materials. After investigating how the speed of the initial stress wave varies with particle properties and loading amplitude, we provide an upper bound for the leading pulse velocity that can be used to design materials with tailored wave propagation.

Effect of Filling Humidity on the Propagation of High-Amplitude Stress Waves through an Artificial Joint

2018 ◽  
Vol 42 (1) ◽  
pp. 20170192 ◽  
Author(s):  
Xiaolin Huang ◽  
Shengwen Qi ◽  
Wei Yao ◽  
Kaiwen Xia
Keyword(s):  
High Amplitude ◽  
Stress Waves ◽  
Artificial Joint
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