Relation between Strength and Stiffness of Cable Tray Part - I
21-May-2021 || By: Admin
Abstract :
In order to understand the optimal design of the cable tray supporting system for the aim of fabric
saving and energy saving and green manufacturing, the strength-stiffness ratio is proposed within the
paper in nondimensional form, which defines quantitatively the relation between the static load strength
and stiffness of the cable tray. On the reason of guaranteeing administration security, the connection
between the strength and firmness of the cable tray under static burden is examined widely through the
hypothetical investigation of the mechanical model. The weakest link within the carrying capacity of the
cable tray
also because the difficulty that has got to concentrate is proposed within the method of design and therefore the test of the cable tray. an inexpensive strength-stiffness ratio will help to make full use of the potential of cloth strengths. the value of the strength-stiffness proportion is reachable through the limited component strategy or by the loading test of the cable tray.. it's shown through the analysis that the worth of the str-ength-stiffness ratio being set within the range on the brink of but but 1 will make comparatively reasonable material utilization and may help the deflection test going smoothly to urge a relatively safer allowable working load for the cable tray.
1. Introduction :
With the rapid develop/ment of electrification and informatization in industry, the cable trays has become an indispensable basic
element in industrial transportation and civil architecture, which have not only a wide range of demand
but also considerable product yield and output value. In case of an accident during the service life,
it'll cause big losses to the economy and society since the upkeep of the cable tray would be quite
difficult. Therefore, the essential requirements for cable tray should cover the long-term safety and
thus the reliable service performance, including the bearing capacity with the seismic resistance and
thus the corrosion resistance. In recent decades, the developments are achieved theoretically,
experimentally, and numerically consistent with various service requirements for cable trays. For
example, the nonlinear response was studied with the damped behavior under seismic excitations . The
dynamic analysis developed from the initial string model supported the idea from inextensible to
extensible elastic beam models, considering the effect of bending stiffness, sag, inclination, and
lateral components . A reduced cable tray support coupled model was proposed to research the modal
resonant dynamics of cables with a versatile support. The nonlinear dynamic behavior of clustered
tensegrity structures was analyzed employing a positional formulation by the finite element method . A
design methodology was developed for the seismic qualification of safety-related cable tray support
systems . In the case of anti electromagnetic interferences, the ampacities of cables laid on the cable
trays were calculated by solving heat transfer equations and computed using the finite element method .
There were the reports about the mutual electromagnetic coupling between cables in enclosed and open
trays , the transfer impedance of an enclosed cable tray in terms of the ratio of width to height as
well as the connecting scheme between cable trays , the analytical interpretation of electromagnetic
interference between open cable trays of solid-bottom type , etc. For the flame retardant capability of
cable tray, there are growing interests in understanding and predicting the hearth development since the
cable tray fire in 1975 at Browns Ferry Nuclear Power Plant. Most of the work was concentrated on
experimental and numerical analyses of cable tray fires, in either open atmosphere or in confined and
mechanically ventilated compartments, as well as the fire behavior of the cable tray arrangements . The
models for flame spread behavior were developed to estimate the heat release rate for the
vertical cable tray
fire and to predict the fire development of the cable tray based on the computational fluid dynamics.In addition to the wants mentioned above, however, new demands inherit being for the cable tray, like the massive span, the lightweight, and therefore the simple construction along with the progress in industrial technologies, especially with the thought and recognition of the resource-conserving and therefore the environment-friendly societies. It should be pointed out that various meshless methods advance very fast in the regime of numerical simulations in recent years, which can yet be regarded expectantly as an effective means in the simulation of cable trays. Since the strength and stiffness are, as a matter of fact, always the most basic requirements of the cable tray, the relation between strength and stiffness of the cable tray are going to be discussed within the paper from a replacement point of view. In general, the strength refers to the capacity of a component in touch loads without damage, while the stiffness refers to the capacity of a component to resist deformation, of course the two concepts should not be confused. In terms of the wants of normal service, both the strength and stiffness of the cable tray must be satisfied absolutely at an equivalent time.
Actually, the security concerns of strength always take precedence over those of stiffness either in theory or in practice for any bearing component. However, it is often seen obviously the range of the wants for stiffness during a sizable amount of components in engineering. For example, the restrictions on deformation are very strict for machine spindles. In contrast, all types of springs require greater deformation capacity to understand the function of energy storage or vibration isolation. Although the deformation of various components is varied in size and form, the essential prerequisite for those components is to satisfy the need of strength.
In the process of the
cable tray manufacturing in India
, on the opposite hand, it's often the case that the deformation or the deflection measurement are going to be administered for inspecting the qualification of products, or for determining the safe working load because the basis of design, since the implementation of measuring deformation is more convenient than that of stress. What must be emphasized is that a structure works inevitably at an elastic state on the entire under the traditional service load correspondingly with a particular relationship existing between the load and deformation. From now on, following the concepts of energy and material saving and green manufacturing, the definition of the strength-stiffness ratio of bending beam is proposed for the cable tray in the paper. The relation between strength and stiffness of the cable tray is studied theoretically and comprehensively in-depth so as to market the optimal design of the cable tray under the premise of ensuring safety and to enhance the economic and social benefits of products.Established in the year 2001, we Hutaib Electricals are amongst the prominent names engaged in Manufacturing , Exporting and Supplying of a wide range of
High Quality Cable Trays
all over the world.We are Cable Tray Manufacturer & Supplier in Pune Mumbai & India.
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