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QuestionWhy Poly tetra fluoro ethylene (PTFE) is usually used in sliding bearings? AnswerThe choice of sliding surface of bearings is of very important importance since sliding surfaces generate frictional forces that are exerted on bearings and substructure of bridge. For example, PTFE and lubricated bronze are usually choices of sliding surfaces for bearings. PTFE is fluro carbon polymer which possesses high-quality chemical resistance and be able to function in wide range of temperature. On whole significant characteristic of this material is its low coefficient of friction. PTFE has slightest possible coefficients of static and dynamic friction of any solid with absence of stick-slip movement by David J. Lee. The coefficient of friction is established to decrease with add to in compressive stress. However, PTFE contain some demerits like high thermal development and low compressive strength. In designing complementary contact plate with PTFE sliding surface, stainless steel plates are in general selected where plates have to be larger than PTFE surface to let movement without exposing PTFE. Moreover, it is recommended that stainless steel surface be located on top of PTFE surface to avoid contamination of dirt and rubbish. Lubricants are now and then introduced to decrease friction between PTFE surface and upper stainless steel plate. Hence, PTFE might be designed with dimples to keep away from lubricant from squeezing out under repeated conversion movements.
What is the Loss of Prestress due to Shrinkage of Concrete It is the loss of prestress due to shrinkage of concrete, which takes place in the initial stage of hardening of conc
Binder: Normally 60/70 penetration grade, and provides cohesion to the mixture and increases its stability. The mix design is done by the Marshall test, in which a specimen
pentavalent will be added impurity
State the Short Term Effects of concrete These are various types of effects produced, nearly instantaneously, due to the application of external loads on structures. An example
How to construct Semi Ellitical Buildings of 15feet dia., in Brick Masonry.
Q. How can a temporary diversion to laid a cross flowing river in case of disruption to rail traffic over a major bridge lasting over 6 months. Ans.- Temporary diversion
cross section diagram of urban roan in embankment,in cut,in eight lane,in conjusted area,divided hihgway
I am a final year civil and structural student and i need your help about my final year project. My Final Year Topic: Finite Element Analysis of a bridge using Sap2000 Aim: Fi
properties?
To determine a trusses ,beams and frames of two degree by compatibility equations and by castiglanoes theorem
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