Dynamic response curves for vertically loaded floating pile foundations

1981 ◽  
Vol 18 (2) ◽  
pp. 300-312 ◽  
Author(s):  
Roger L. Kuhlemeyer
Keyword(s):  
Dynamic Response ◽  
Good Accuracy ◽  
Pile Foundations ◽  
Response Curves ◽  
Floating Pile

Response curves that can be easily used by designers are presented for vertically loaded floating piles. The good accuracy of the theory used was previously confirmed. A design example is presented that illustrates application of the curves.

Steady-State Dynamic Response of a Limited Slip System

1968 ◽  
Vol 35 (2) ◽  
pp. 322-326 ◽  
Author(s):  
W. D. Iwan
Keyword(s):  
Steady State ◽  
Dynamic Response ◽  
Slip System ◽  
External Load ◽  
Initial Conditions ◽  
Viscous Damping ◽  
Steady State Response ◽  
Response Curves ◽  
State Response ◽  
System Nonlinearity

The steady-state response of a system constrained by a limited slip joint and excited by a trigonometrically varying external load is discussed. It is shown that the system may possess such features as disconnected response curves and jumps in response depending on the strength of the system nonlinearity, the level of excitation, the amount of viscous damping, and the initial conditions of the system.

The Dynamic Response of a Simple Elastic System to Antisymmetric Forcing Functions Characteristic of Airplanes in Unsymmetric Landing Impact

1949 ◽  
Vol 16 (3) ◽  
pp. 310-316
Author(s):  
Joseph B. Woodson
Keyword(s):  
Dynamic Response ◽  
Sine Wave ◽  
Response Curves ◽  
Response Factors ◽  
Natural Period ◽  
Wave Pulse ◽  
Pulse Disturbance ◽  
Landing Impact ◽  
Forcing Functions ◽  
The Difference

Abstract This paper presents an analysis of the dynamic response of an undamped mechanical system with one degree of freedom subjected to disturbances which are described by antisymmetric forcing functions. The analysis was undertaken to throw light on the effect on the vibration of the wings caused by unsymmetric landing impact of an airplane. Two types of disturbances are considered; a full-sine-wave pulse, and a pulse which is the difference between two overlapping half sine waves. The results are presented in the form of dynamic-response curves and dynamic-response-factor curves. The numerically greatest dynamic-response factors, approximately 3.24 and −3.26, resulted for a full-sine-wave pulse disturbance with a ratio of duration of impact to natural period, Ti/T ≅ 1.11. When Ti/T is in the neighborhood of 1, the first positive peak of dynamic response is numerically less than the negative and positive peaks which follow it. For much of the range, the positive and negative dynamic-response factors are numerically approximately equal. The analysis was confined to values of Ti/T between 0.33 and 12. As Ti/T increases without limit, the positive and negative dynamic-response factors tend to 1 and −1, respectively.

scholarly journals Dynamic behaviour of an earthen material under different impact loading conditions

2018 ◽  
Vol 183 ◽  
pp. 02014
Author(s):  
Luigi Fenu ◽  
Francesco Aymerich ◽  
Luca Francesconi ◽  
Daniele Forni ◽  
Nicoletta Tesio ◽  
...  
Keyword(s):  
Dynamic Response ◽  
Impact Loading ◽  
Dynamic Behaviour ◽  
Hopkinson Bar ◽  
Impact Response ◽  
Favourable Effect ◽  
Impact Loads ◽  
Response Curves ◽  
Hemp Fibres ◽  
Modified Hopkinson Bar

The dynamic behaviour of earthen materials reinforced with natural fibres is little studied although earth buildings are often built in seismic areas. In this paper the dynamic behaviour of an earthen material reinforced with hemp fibres under different impact loadings has been experimentally investigated. The dynamic response of the material in 3-point bending was investigated through an instrumented dropweight device, while the response in tension and in compression was investigated through a modified Hopkinson bar device. Typical impact response curves for tension, compression and bending impact tests have been obtained. The favourable effect of fibres in dissipating fracture energy under impact loads has been observed in all these types of test.

scholarly journals The Dynamic Response of the Vibrating Compactor Roller, Depending on the Viscoelastic Properties of the Soil

2020 ◽  
Vol 3 (2) ◽  
pp. 25
Author(s):  
Cornelia Dobrescu
Keyword(s):  
Dynamic Response ◽  
Soil Compaction ◽  
Viscoelastic Properties ◽  
Dynamic Effect ◽  
Pulse Response ◽  
Compaction Process ◽  
Response Curves ◽  
Soil Layers ◽  
Transmitted Force ◽  
Practical Engineering

The present paper addresses the problem of the dynamic response of a vibrating equipment for soil compaction. In essence, dynamic response vibrations are analysed by applying an inertial-type perturbing force. This is generated by rotating an eccentric mass with variable angular velocity, in order to reach the regime necessary to ensure the degree of compaction. The original character of the research is that during the compaction process, the soil layers with certain compositions of clay, sand, water and stabilizing substances change their rigidity and/or amortization. In this case, two situations were analysed, both experimentally and with numerical modelling, with special results and practical engineering conclusions, favourable to the evaluation of the interaction between vibrator roller–compacted ground. We mention that the families of amplitude–pulse and transmitted force–pulse response curves are presented, from which the dynamic effect in the compaction process results after each passage on the same layer of soil, until the necessary compaction state is reached.

Dynamic response of a concrete dam impounding an ice-covered reservoir: Part II. Parametric and numerical study

2004 ◽  
Vol 31 (6) ◽  
pp. 965-976 ◽  
Author(s):  
Najib Bouaanani ◽  
Patrick Paultre ◽  
Jean Proulx
Keyword(s):  
Dynamic Response ◽  
Frequency Response ◽  
Parametric Study ◽  
Seismic Analysis ◽  
Numerical Study ◽  
Ice Cover ◽  
Concrete Dams ◽  
Response Curves ◽  
Concrete Dam ◽  
Structure Interaction

This paper presents a numerical and parametric study of the effect of an ice cover on the dynamic response of a concrete dam using the approach proposed in the companion paper in this issue. The method was programmed and implemented in a finite element code specialized for the seismic analysis of concrete dams. The 84-m-high Outardes 3 concrete gravity dam in northeastern Quebec was chosen as a model for this research. Some basic aspects of the numerical model are established in this paper and we show that the ice cover affects the dynamic response of the ice–dam–reservoir system. Main features of this influence are emphasized and discussed in a parametric study through the analysis of: (i) acceleration frequency response curves at the dam crest, (ii) hydrodynamic frequency response curves inside the reservoir, and (iii) the hydrodynamic pressure distribution on the upstream face of the dam. Key words: gravity dams, concrete dams, ice, reservoirs, mathematical models, ice–structure interaction, fluid–structure interaction, forced-vibration testing, finite elements modelling.

Dynamic Matching of Acceleration Transducers

1986 ◽  
Vol 108 (4) ◽  
pp. 306-313 ◽  
Author(s):  
Kalman Peleg ◽  
Shabtai Shpigler
Keyword(s):  
Dynamic Response ◽  
Good Accuracy ◽  
Transfer Functions ◽  
Dynamic Matching ◽  
Response Characteristics ◽  
Acceleration Signal ◽  
Operating Frequency Range ◽  
Dynamic Response Characteristics ◽  
Electronic Compensation ◽  
Effective Transfer

Small mismatches between similarly manufactured accelerometers stem from slight differences between their flexural elements, seismic masses and their mountings, as well as variations in damping ratios. This is not detrimental for measuring absolute accelerations, but when it is desired to measure differential accelerations, very large errors may result. This is probably the main reason why transducers for measuring differential acceleration are not generally commercially available. Measuring the differential acceleration between two accelerometers mounted in different locations of an item provides a convenient means of measuring the relative velocity and displacement by single and double integration of the differential acceleration signal. To do this with good accuracy both accelerometers must have identical static and dynamic response characteristics. A method of matching the D.C. and dynamic response characteristics of any number of similarly manufactured piezoresistive acceleration transducers is described. This method is based on electronic compensation networks whereby the combined transfer functions of the transducers and their compensation networks are matched, enabling differential acceleration measurements with good accuracy. In addition to matching the effective transfer functions of the transducers, this method also significantly extends the operating frequency range in both absolute and differential measurements. The line taken is based on a general mathematical model, which was developed for quantifying error sources in differential measurements at large.

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