2 edition of damping properties of plain concrete found in the catalog.
damping properties of plain concrete
|Statement||by R. Jones andG. B. Welch.|
|Series||Reports / Road Research Laboratory -- LR111|
|Contributions||Welch, G. B., Road Research Laboratory.|
KEYWORDS: effective damping ratio, damping coefficient, viscous damping, reinforced concrete, buildings. 1. INTRODUCTION The response of buildings to earthquake ground shaking is a complex process. During strong shaking, the structural system of the building may be forced to behave inelastically. In addition to theFile Size: 1MB. COMPONENTS OF CONCRETE Concrete is made up of two components, aggregates and paste. Aggregates are generally classi! ed into two groups,! ne and coarse, and occupy about 60 to 80 percent of the volume of concrete. The paste is composed of cement, water, and entrained air and ordinarily constitutes 20 to 40 percent of the total Size: 1MB.
Strength and deformation properties of plain concrete subject to combined stress (Technical reports / Cement and Concrete Association) [Donald William Hobbs] on . The damping ratio of ordinary concrete with a strength grade of C30 was approximately to It was reported that the damping ratio of plain concrete of the same mixture proportion without EPS particles was stable at about under the cyclic loading of a 40 kN amplitude and 5 Hz frequency. It can be seen that the structural Author: Quan You, Linchang Miao, Chao Li, Huanglei Fang, Xiaodong Liang.
in concrete structures (as a heavyweight structure), damping treatment such as rubber and viscoelastic damping materials can be effective to prevent floor impact noise and vibration. Setup: Beam transfer function method The dynamic properties of various reducing materials for floor impact insulation are measured. The measurementAuthor: Jae Ho Kim, Seung Yup Yoo, Jin Yong Jeon. Book series; Subjects. All Subjects; Buildings and structures; Coastal and offshore engineering; Development, planning and urban engineering; Energy; Geology, geotechnical and ground engineering; Health and safety; Law and contracts; Leadership and management; Professional development; Science; Transportation; Water engineering and wastewater.
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The damping properties of plain concrete: effect of composition and relations with elasticity and strength. Damping ratios of plain concrete, with or without reinforcement, is known to have relatively non-desirable properties (Amick and Monteiro ). Accordingly, to improve the structural damping of.
Damping ratio ζ is another means of specifying viscuous damping and and it is given by ζ = c/c cr, that the ratio of actual damping to critical damping. The formula you gave for ζ is in order. In this present study, static and dynamic properties of polypropylene fiber reinforced concrete damping properties of plain concrete book have been experimentally studied.
The mechanical properties have been carried out by conducting compression, splitting tensile and flexural strength of : Radhika Sridhar, Ravi Prasad.
Plain concrete exhibits low damping compare to other building materials and many engineering ap-plications would be enhanced if the concrete tech-nologist could design concrete mixtures with in-creased damping . Concrete with vibration damping ability is needed for vibration reduction and hazard mitigation of bridges, buildings and other.
This study aimed to explore the damping property of a cement-based material with carbon nanotube (CNT). In the study, the cement composites with different contents of CNT (0 wt%, wt%, wt%, and wt%) were investigated.
Logarithmic Decrement method and Dynamic Mechanical Analysis (DMA) method were utilized to study the damping property of CNT/cement by: A good source for the damping properties of materials can be found in Cremer and Heckl's book Structurborne Sound, Springer-Verlag,Tables III-2 and III-4, Mechanical properties of Metals and Building Materials, respectively.
An approach using experimental modal analysis (EMA) is presented for measuring the material damping properties of concrete beams. This approach, now popular in mechanical engineering, uses hammer-blow excitation and frequency-domain analysis to estimate resonance frequencies and modal damping.
The data allow identification of damping associated Cited by: 3. The application-specific properties of concrete such as damping or vibration absorbing capacity can be enhanced, by the use of scrap rubber tires as aggregates in concrete.
This paper evaluates the feasibility of using shredded waste rubber as a partial replacement to fine aggregate, with respect to mass, by conducting investigations on its. Four different categories of laboratory concrete specimens including plain concrete (PC), fiber reinforced concrete (FRC), polymer modified concrete (PMC), and using fibers in polymer modified concrete (FRPMC) were cast and tested to determine the damping ratio of these concrete categories.
There is no doubt that the use of waste rubber in concrete applications is a genius alternative because Styrene is the main component of rubber, which has a strong toxicity and is harmful to humans.
Therefore, it will significantly reduce impacts on the environment when waste rubber can be recycled for genuine uses. In this paper, the dynamic properties of high-strength rubberised concrete Cited by: Properties of Concrete Concrete is an artificial conglomerate stone made essentially of Portland cement, water, and aggregates.
Properties of Concrete While cement in one form or another has been around for centuries, the type we use was invented in in Britain. It. In this study, the mechanical and dynamic properties of Self-Compacting Rubberised Concrete (SCRC) were experimentally investigated.
Crumb rubber from scrap tyres was used as a partial replacement for Fine Aggregate (FA), Coarse Aggregate (CA) and combined Fine and Coarse Aggregate (FCA) at 5, 10, and 15 wt% by: Polymer concrete was introduced in the late s and became well known in the s for its use in repair, thin overlays and floors, and precast components.
Because of its properties like high compressive strength, fast curing, high specific strength, and resistance to chemical attacks polymer concrete has found application in very specialized by: Sorbothane® is a proprietary, thermoset, polyether-based polyurethane material with a superior damping coefficient.
It is a material that exhibits visco-elastic properties, meaning that it performs like a liquid under load and like an elastic solid when at rest, by converting. Let us say a machine foundation is rest on soil mass. Now the mass of machine and foundation acts downwards together and it is say m f which acts at the center of gravity of the system.
The mass of soil which acts upwards is say m s. the elastic action of soil due to vibration of system is dependent of stiffness ance against motion is dependent of damping coefficient : Sadanandam Anupoju.
Damping is an influence within or upon an oscillatory system that has the effect of reducing, restricting or preventing its oscillations. In physical systems, damping is produced by processes that dissipate the energy stored in the oscillation.
Examples include viscous drag in mechanical systems, resistance in electronic oscillators, and absorption and scattering of light in optical oscillators. If for example, the damping ratios are ζ p = 5% and ζ s = 4%, or ζ p = 6% and ζ s = 2%, or ζ p = 6% and ζ s = 4%, cases arising from typical damping values for concrete and steel structures as provided by seismic codes, the resulting modal damping ratios are presented in Fig.
6, Fig. 7, Fig. 8, respectively where the color scale has been Cited by: added vol.% and vol.% PVA fibers to the concrete and measured the damping ratio through impact resonance test.
It was found that addition of PVA fibers in low volume fraction had no significant effect on concrete material damping ratio. There are two reasons for this.
(1) PVA fiber is hydrophilic. CHAPTER 2: CONCRETE MATERIAL MODEL Introduction The response of a reinforced concrete structure is determined in part by the material response of the plain concrete of which it is composed.
Thus, analysis and prediction of structural response to static or dynamic loading requires prediction of concrete response to variable load histories. Inherently, reinforced concrete structures have low damping value, in the order of % of critical damping. Enhanced damping value protects the structural system.
Damping characteristics of a structure could be improved by addition of additional damping devices, Dampers; at the strategic locations within the structure; which could be very.
In order to determine the effect of polypropylene fibers in concrete and to compare, the properties of plain concrete have also been studied. The test results emphasize that the addition of fibers reduces the fundamental frequency and increase the damping ratio of : Radhika Sridhar, Ravi Prasad.Concrete Basicsaims to provide a clear, concise explanation of all aspects of making quality concrete; from the Materials and Properties involved through Planning, Preparation, Finishing and Curing.
Concrete Basicsaddresses the needs of unskilled and semi-skilled persons undertaking general concreting projects including home and handyman Size: KB.