BI-DIRECTIONAL RESPONSE CHARACTERISTICS OF STRUCTURAL MODEL FOR BI-DIRECTIONAL HORIZONTAL SEISMIC LOADS

2018 ◽  
Vol 74 (4) ◽  
pp. I_1087-I_1096
Author(s):  
Kazuma INOUE ◽  
Kazuaki WATANABE ◽  
Akira IGARASHI
Keyword(s):  
Structural Model ◽  
Seismic Loads ◽  
Directional Response ◽  
Response Characteristics

Directional Response of a B-Train Vehicle Combination Carrying Liquid Cargo

1993 ◽  
Vol 115 (1) ◽  
pp. 133-139 ◽  
Author(s):  
R. Ranganathan ◽  
S. Rakheja ◽  
S. Sankar
Keyword(s):  
Free Surface ◽  
Three Dimensional ◽  
Lateral Acceleration ◽  
Flow Conditions ◽  
Vehicle Model ◽  
Liquid Motion ◽  
Directional Response ◽  
Response Characteristics ◽  
Weight Density ◽  
Liquid Movement

Directional dynamics of a B-train tank vehicle is investigated by integrating the three-dimensional vehicle model to the dynamics associated with the movement of free surface of liquid within the partially filled tanks. The motion of the free surface of liquid due to instantaneous tank roll and lateral acceleration is computed assuming steady state fluid flow conditions. The influence of liquid motion on the dynamic response of the rearmost trailer is investigated for both constant and transient steer inputs, assuming constant forward speed. Directional response characteristics of the B-train tank vehicle are compared to those of an equivalent rigid cargo vehicle to demonstrate the destabilizing effects of the liquid movement within the tank vehicle. Directional response characteristics are further discussed for variation in weight density of liquid and thus the fill height, while the axle loads are held constant around maximum permissible values.

Stability Analysis and Potential Seismic Capacity Evaluation of an Elliptic Paraboloid Latticed Shell

2012 ◽  
Vol 256-259 ◽  
pp. 2152-2160 ◽  
Author(s):  
Xiao Nong Duan ◽  
Zhu Juan Yang ◽  
Neng Tang ◽  
Xue Ting Chen
Keyword(s):  
Seismic Response ◽  
Structural Model ◽  
Linear Time ◽  
Response Spectrum ◽  
Time History ◽  
Initial Imperfection ◽  
Static Stability ◽  
Seismic Capacity ◽  
Elliptic Paraboloid ◽  
Response Characteristics

The stability and the potential seismic capacity of the double-layer elliptic paraboloid latticed shell roof structure of a stadium was analyzed and evaluated, performing by Midas Gen software. Firstly, the seismic response spectrum analyses and the linear time-history analyses were carried out respectively on two different analysis models: the integral structural model containing the lower support structure and the single latticed shell model. The seismic response characteristics and the potential seismic capacity of the models were compared and evaluated. Secondly, based upon the real detailed design of the stadium, the static stability of the latticed shell was analyzed, considering both the geometrical non-linearity and the initial imperfection. Thirdly, the influence of the effects of the vertical ground motion upon the latticed shell structure was studied. The analysis method adopted and the conclusions obtained can be used as references for the future similar engineering projects.

Response Characteristics of Four Wide-Field Motion-Sensitive Descending Interneurones IN Apis Melufera

1990 ◽  
Vol 148 (1) ◽  
pp. 255-279 ◽  
Author(s):  
MICHAEL R. IBBOTSON ◽  
LESLEY J. GOODMAN
Keyword(s):  
Vertical Axis ◽  
Longitudinal Axis ◽  
Contralateral Side ◽  
Wide Field ◽  
Periodic Patterns ◽  
Directional Response ◽  
Ipsilateral Side ◽  
Thoracic Ganglia ◽  
Response Characteristics ◽  
The Brain

The anatomical projections and directional tuning of four descending interneurones sensitive to wide-field motion over the compound eyes are described. The cells are slow to adapt, resistant to habituation and their responses are dependent on the contrast frequency of the periodic patterns used as stimuli. Two of the cells (DNIV2 and DNIV4) are maximally stimulated by movement around the longitudinal axis of the bee (simulated roll), one (DNII2) by movement around the horizontal axis (simulated pitch) and one (DNVI1) by movement around the vertical axis (simulated yaw). The cells are binocular, their directional response being shaped by the interaction of the inputs from each eye. The cells which respond predominantly to roll (DNIV2 and DNIV4) have their arborizations restricted to the ipsilateral side of the brain and thoracic ganglia, i.e. the side which contains the cell soma. The cell responding to pitch (DNII2) has its arborizations distributed bilaterally, invading similar regions of the neuropile in both sides of the brain and thoracic ganglia. The cell which responds to yaw (DNVI1) has its major dendritic field in the ipsilateral side of the brain and descends into the thoracic ganglia in the contralateral side. The majority of its arborizations in the thoracic ganglia are confined to the contralateral neuropile.

On the Nonlinear Response of Piping to Seismic Loads

2001 ◽  
Vol 123 (3) ◽  
pp. 324-331
Author(s):  
Luciano Lazzeri
Keyword(s):  
Complex Systems ◽  
Frequency Shift ◽  
Nonlinear Response ◽  
Experimental Tests ◽  
Piping System ◽  
Seismic Loads ◽  
Response Characteristics ◽  
Specific Geometry

The response of a piping system to extreme seismic conditions may be controlled and limited by yielding of the structure. The effect of yielding has been found to be decisive for individual components, but for complex systems, the effect of yielding may be either important or negligible, depending on the specific geometry. Analytical and experimental tests are reviewed. The L test is devised to give an indication of the response characteristics of the system. It has been found that a parameter related to the frequency shift is capable of reasonably predicting the effect of yielding.

Dynamic-response characteristics and deformation evolution of loess slopes under seismic loads

2020 ◽  
Vol 267 ◽  
pp. 105507
Author(s):  
Zhijian Wu ◽  
Dan Zhang ◽  
Shengnian Wang ◽  
Chao Liang ◽  
Duoyin Zhao
Keyword(s):  
Dynamic Response ◽  
Seismic Loads ◽  
Response Characteristics ◽  
Dynamic Response Characteristics

Study on the Structural Parameters and Response Characteristics of the Tilted Antenna of Directional Electromagnetic Wave Resistivity Measuring Instrument

2019 ◽  
Vol 34 (02) ◽  
pp. 2058001
Author(s):  
Xicao Xie ◽  
Jie Wu
Keyword(s):  
Numerical Simulation ◽  
Electromagnetic Wave ◽  
Physical Parameters ◽  
Measuring Instrument ◽  
Directional Response ◽  
Interface Position ◽  
Magnetic Current ◽  
Response Characteristics ◽  
Receiving Antenna ◽  
Logging While Drilling

The directional logging-while-drilling measurements enable to monitor the distance to formation boundaries and their orientation and facilitate proactive well placement, and thus can provide directionality information useful in detecting physical parameters such as bed boundaries, formation dip and formation azimuth, so the oil and gas recovery can be greatly improved. The characteristics of a kind of electromagnetic wave resistivity logging while drilling (LWD) tool with tilted antennas are computed via the magnetic-current-source dyadic Green’s function for horizontally stratified anisotropic media. The current characteristic at the formation interface of the tilted antennas is compared with that of the axial antenna, and how the LWD tool with tilted antennas to detect the formation interface position and orientation is revealed. The amplitude-attenuation and phase-shift characteristics of LWD tool with tilted antennas are analyzed, and how to design the angle of tilted antenna is presented. The relationship between the emitting frequency and emitting-receiving antenna space parameters is expounded, and the emitting-receiving antenna space parameter suitable for different frequencies is presented. The detection characteristic of the electromagnetic wave measuring instrument is studied. For the highly deviated well formation model, the directional response characteristics of the different relative dip angle isotropic and anisotropic formation are numerically simulated and analyzed. The directional response characteristics of the two kinds of coil arrangement (unilateral arrangement and symmetrical arrangement) are analyzed by numerical simulation, and the solution to reduce or eliminate the influence of the directional response of the isotropy on the directional response is obtained. The conclusions obtained by theoretical analysis and numerical simulation provide a guide for the instrument principle research and application.

scholarly journals SEISMIC REACTION OF NONLINEAR SYSTEM OF SEISMIC DEFENSE WITH KINEMATIC SUPPORTS

2019 ◽  
Vol 45 (3) ◽  
pp. 134-144
Author(s):  
A. D. Abakarov ◽  
H. R. Zajnulabidova
Keyword(s):  
High Frequency ◽  
Seismic Isolation ◽  
Statistical Tests ◽  
Analytical Techniques ◽  
Seismic Loads ◽  
Isolation System ◽  
Response Characteristics ◽  
The Mean ◽  
High Frequency Effects ◽  
Analytical Expressions

Objectives. The aim of the study is to obtain formulae for calculating probability of seismic response characteristics of nonlinear seismic isolation system with the specified function "force-shifting", characteristic of seismic isolation system with kinematic pillars and score the effectiveness of this system of seismic isolation in multi-storey buildings.Method. The studies were performed analytical techniques and numerical method of statistical tests.Result. Analytical expressions to calculate the mean square value of one massive seismic isolation system with displacement kinematic pillars and the effectiveness of the application of graphs of kinematic seismic isolation bearings for multi-storey buildings based on the results of numerical experiments using the method of statistical tests.Conclusion. Application of kinematic supports, with "power-move" described by the specified in the work of a non-linear function, allows you to reduce the seismic loads on buildings and distortions of floors 2 or more times. Kinematic bases are more effective when high-frequency effects and in the buildings of the constructive solution of a height of not more than 5 floors.

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