Prestressed Concrete Institute.) 1 7166M01.qxd_lb 6/3/09 09:38 AM Page 2 2 Chapter 1 Basic Concepts Figure 1.1 Prestressing principle in linear and circular prestressing. (a) Linear prestressing of a series of blocks to form a beam. (b) Compressive stress on midspan section C and end section A or B. (c) Circular prestressing of a wooden barrel by
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cracking‚ shrinking and creeping of concrete. Therefore‚ reinforcement is placed at areas in the concrete where tensile stresses develop. In this report the reinforcement methods will for the most part be discussed in terms reinforcement in beams. Stresses in a beam develop as illustrated in the following figure: Choosing the right methods of reinforcement for a specific concrete element will depend on the properties of the concrete mix and the materials of which the reinforcement is made. The properties
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to another lens receiving the information. The receiving lens connects to a high-sensitivity receiver via optical fiber. Because the transmission in occurred in air it is easily upgradable. FSO send a light beam from one point to another using low power lasers in the teraHertz spectrum. This beam is transmitted by laser light focused on photon detector receivers. These receivers collect the photon stream and transmit digital data. If there is a clear line between the two point FSO can operate on a
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was done so that the blue beam hit the third ring on the circle and the voltage that was recorded was 91.5V. Once the voltage was recorded the next objective was to find the value of the magnetic field. The current value that went along with circle number three was 3.08A and to find the B value the equation B=(8/sqrt(125))(μ0NI/R) was used. The B value for the third circle was computed to be 3.17x10-3T. The next step in the experiment was the radius for the electron beam‚ to do this the equation r=(
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Disk With Weight: A 15 kg uniform disk of radius R = 0.25 m has a string wrapped around it‚ and a m = 3 kg weight is hanging on the string. The system of the weight and disk is released from rest. a) When the 3 kg weight is moving with a speed of 2.2 m/s‚ what is the kinetic energy of the entire system? KETOT = KEwheel+KEweight = (1/2)(I)(w2)+(1/2)(m*v2) =(0.5* v2)(m+1/2M) =0.5*(2.2^2)*(3+(.5*15)) J b) If the system started from rest‚
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circuit Fig. 3: Pin configurations of TSOP1738 and UM66 Fig. 2: Receiver circuit pillars of the gate such that the IR beam gets interrupted when someone is standing at the gate or passing through it. The transmitter circuit (see Fig. 1) is built around timer NE555 (IC1)‚ which is wired as an astable multivibrator producing a frequency of about 38 kHz. The infrared (IR) beam is transmitted through IR LED1. The receiver circuit is shown in Fig. 2. It comprises IR sensor TSOP1738 (IR RX1)‚ npn transistor
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shearing force (SF) at any section of a beam represents the tendency for the portion of the beam on one side of the section to slide or shear laterally relative to the other portion. The diagram shows a beam carrying loads . It is simply supported at two points where the reactions are Assume that the beam is divided into two parts by a section XX The resultant of the loads and reaction acting on the left of AA is F vertically upwards and since the whole beam is in equilibrium‚ the resultant force
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Löhner suggests that they placed the blocks on a sledge or a type of sled made of wooden beams. Two or three beams would be laid down with a beam connecting them on each side to make the sledge. They then made tracks that the sledge would run along. The tracks were made of two parallel sets of beams that the sledge sat on. To reduce friction between the beams of the sledge and the tracks they used watery oil to lubricate the way. These tracks could be easily placed from
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CIVL980 – ADVANCED COMPUTER APPLICATION GROUP PROJECT #1: Finite Element Modelling and Analysis of a Pedestrian Bridge in North Sydney Felix Le Besnerais 4410348 Tuan Vu Ho 4381920 Table of Contents Executive Summary This project details all the procedure to evaluate static and dynamic responses of a pedestrian bridge. To this end‚ we need to: Prepare sketches showing the layout of the structure including its member sizes and dimensions. Determine and calculate
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volumes without the interference of internal columns allow maximum freedom to plan inside layouts. ADVANTAGES: • • • • • Wide free spans Great flexibility regarding the inside layouts Reduced overall building height Rapid erection No disturbing floor beams ASTRON-MULTI-STOREY BUILDINGS: The system combines‚ in a most ideal way‚ the flexibility of steel with the solidity of concrete. A special feature of the ASTRON
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