design of fasteners in built up beams

... of inertia of area polar moment of inertia of area centroidal polar moment of inertia of area stress concentration factor; radius of gyration of area; spring sti¤ness length e¤ective length of ... until Chapter Engineering instructors often hold o¤ teaching the concept of state of stress at a point due to combined loading until students have gained su‰cient experience analyzing axial, torsional, ... analysis, including stress, strain, torsion, bending and combined loading An instructor can easily teach these topics within the time constraints of a two-or three-credit course The remaining five...

Ngày tải lên: 09/03/2016, 10:22

... (ii) cross-sections remain plane during twisting; and (iii) rahi remain straight during twisting If is the relative angle of twist of the two ends of the sha elemental tube of hckness 6r and at ... shafts and thin-walled tubes 376 If T is the shearing stress at any point, then we are interested in the principal stresses of the system shown in Figure 16.8; for this system the principal stresses, ... The shearing stress at any point is then (16.38) Torsion of circular shafts and thin-walled tubes 84 (16.39) To find the angle of twist of the tube we consider the strain energy stored in Le tube,...

Ngày tải lên: 08/04/2014, 11:29

... Torsion of non-circuhr sections 494 = shear strain in the y-z plane = ,y - + a ~= aw ay (20.5) e(?+,) az The equations of equilibrium of an infinitesimal element of dimensions dx obtained with ... Varying section shaft As the section is circular, it is convenient to use polar co-ordinates Let, E, = radial strain = E, = hoopstrain = E, = axialstrain y , = shear strain in a longitudinal ... To determine the torsional equation 493 Figure 20.2 Displacement of P Consider any point P in the section, which, owing to the application of T,will rotate and warp, as shown in Figure 20.2:...

Ngày tải lên: 08/04/2014, 11:29

... about 65% of the bending effect The bending and membrane effects are about the same when GJ/t = 1.24 A plot of the variation of GJ due to bending and due to the combined effects of bending plus ... required to determine these unknowns One equation can be obtained by considering the continuity of w at r = R , in equation (19.38), and the other two equations can be obtained by considering boundary ... deflection of plates 48 whch, on substituting into (19.64), gives: but are all dunensionless, and h s feature will be used later on in the present chapter Substituting r, in terms of into equation...

Ngày tải lên: 08/04/2014, 11:28

... bending moments 4, To obtain the final values of nodal bending moments, the bending moments of condhon (1) must be superimposed with those of condition (3) Beam element End-fixing forces Element 1-2 ... principle of superposition: Fix the beam at its nodes and determine the end furing forces, as shown in the following figure at (a) and (b) and as calculated below The beam in condition (1) is not in ... components of stiffness corresponding to these displacements The system stiffness matrix [K] is obtained by superimposing the coefficients of stiffness of the elemental stiffness matrices of equations...

Ngày tải lên: 08/04/2014, 11:28

... “Analysis of influencing parameters and bases to determine resistance factors of drilled shafts used in bridge substructures in Ho-ChiMinh City” Objectives: Determine resistance factors according to ... design The selection of the level of reliability or target reliability index relates to the level of reliability that is being used in the design, form of structural damage, the sensitivity of ... Analysis of literature showing the LRFD application and determining resistance factors for bridge design in Vietnam 1.5 Current challenging problems Some current problems in bridge design standards...

Ngày tải lên: 02/07/2014, 20:32

... majority of cases are still diagnosed intra-operatively Laparoscopy is an excellent diagnostic tool in the management of acute abdominal pain, allowing inspection of the entire abdominal cavity, ... history of progressively worsening right iliac fossa pain The pain was constant and made worse on movement She had no change in her bowel habit and complained of nausea but no vomiting Urinalysis ... calcification on histology Conclusion Torsion of intraperitoneal fat is a rare but well recognised cause of acute abdominal pain, often mimicking more common causes of an acute abdomen such as appendicitis,...

Ngày tải lên: 11/08/2014, 17:21

... obtained from the patient for publication of this case report and accompanying images A copy of the written consent is available for review by the Editor -in- Chief of this journal Competing interests ... be considered in the differential diagnosis of acute abdominal pain in the third trimester of pregnancy Publish with Bio Med Central and every scientist can read your work free of charge "BioMed ... Cooney N, Denin A: Usefulness of Doppler sonography in the diagnosis of ovarian torsion Fertil Steril 2000, 73:1047-1050 Born C, Wirth S, Stäbler A, Reiser M: Diagnosis of adnexal torsion in the third...

Ngày tải lên: 11/08/2014, 19:21

... cholangiopancreatography Competing interests The authors declare that they have no competing interests Authors' contributions All of the named authors were involved in the preparation of this manuscript ... distortion of the extrahepatic bile ducts due to traction by the cystic duct, a tapering and twisting interruption of the cystic duct, a distended gallbladder and a high signal intensity within the ... history of sudden onset, severe right upper quadrant pain and vomiting An abdominal mass may or may not be palpable and there are usually no signs of toxaemia or jaundice Laboratory investigations...

Ngày tải lên: 11/08/2014, 21:22

... 12 in for bars and in for welded wire reinforcement The reinforcement should be located in the upper portion of the slab thickness, with a minimum cover of in from the top of the slab and in ... fixed points (constant strain level equal to initial strain), psi The intrinsic relaxation depends upon the type and quality of the prestressed reinforcement and the initial prestress level in the ... local increases in radius βc = buckling reduction factor for creep, nonlinearity and cracking of concrete ∆Pc = change in compressive force in the concrete, lbs εcs = free shrinkage strain of concrete...

Ngày tải lên: 24/10/2014, 17:26

... knowledge of prestressing principles and experience with the winding system being used 4.5.1.3 Anchoring of wire or strand—To minimize the loss of prestressing in case of a break during wrapping, ... and • Design the roof structure to resist the resulting uplift pressures 2.3.9.3 Criteria for determining the seismic response of tanks, including sloshing of the tank contents, are given in References ... considered in the design: • Prestressing forces—circumferential prestressing forces in the walls and dome rings; vertical prestressing, if used in the walls; and roof prestressing if used; • Internal...

Ngày tải lên: 24/10/2014, 17:26

... actin-binding proteins have been shown to play a role in the stabilization of the actin network by cross-linking the filaments, such as cortactin and α-actinin [206, 42] Another type of actin ... prevents the capping of the barbed ends of the actin filaments and also binds to profilin, therefore increasing the local concentration of actin monomers and heightening the rate of actin polymerization ... for instance profilin [61] A third class of actin-binding proteins keep the actin monomers in a sequestered form, such as beta thymosins [264, 61, 214] This facilitates rapid changes in the actin...

Ngày tải lên: 09/09/2015, 18:51

... former is able to tug -in at both sides of the jet as it closes in at the lee-side of the jet This stretching pinches two “tails” off the sides of the jet and the closing -in of the cross flow causes ... Available information suggesting this includes the corresponding increase in the strength of the secondary CVP when the primary CVP strength is increased with increasing velocity ratios In addition, ... exit) by bending and titling the vortex rings, complication sets in when one tries to explain the formation of the CVP using vortex rings Therefore, the validity of employing vortex rings to model...

Ngày tải lên: 17/09/2015, 17:19

... understanding how the MRAM stores information using the MTJ We also highlighted the challenges facing the design of MRAM, which inspired the use of underlying current-carrying conductors in the setup of ... used to offer flexibility of design and precision of making the fine structures To use a current-carrying conductor to introduce the changes in domain configurations To investigate the switching ... thickness in the range of to 55 nm A typical vortex state is observed in the ellipses with thickness of 23 nm and aspect ratio of and This shows the increasing ease of forming single-domain structures...

Ngày tải lên: 05/10/2015, 19:03

... conditions, in the form of slightly speeding up of the flow near the cylinder ends To further the understanding of the mechanism of the Transverse Control Cylinder Technique, the velocity profile upstream ... EFFECTS OF CIRCULAR CYLINDER ON ITS WAKE AT REYNOLDS NUMBER OF O(104) XIA HUANMING (B.Eng., NUAA) A THESIS SUBMITTED FOR THE DEGREE OF MASTER OF ENGINEERING DEPARTMENT OF MECHANICAL ENGINEERING NATIONAL ... the ends of the test cylinder By suitably speeding up the flow near the test cylinder ends, parallel vortex shedding can also be induced Fig.1.3 Parallel vortex shedding induced by using endplates,...

Ngày tải lên: 05/10/2015, 21:22

... ANALYSIS OF CIRCULAR VERY LARGE FLOATING STRUCTURES BY LE THI THU HANG B.E (Hanoi University of Civil Engineering) A THESIS SUBMITTED FOR THE DEGREE OF MASTER OF ENGINEERING DEPARTMENT OF CIVIL ENGINEERING ... providing the financial support in the form of the NUS scholarship and facilities to carry out the research Thanks are also extended to my colleagues in Civil Engineering Department for their kind ... aforementioned inaccuracies The use of the more refined plate theory of Mindlin (1951) that incorporates the effects of transverse shear deformation and rotary inertia, the accuracy of the stress-resultants,...

Ngày tải lên: 22/10/2015, 21:14

... growth Hale is often quoted in the press and in numerous trade publications on consumer trends Todd has more than 33 years of experience in the consumer research industry, including 27 years with ... penetration; upside argument flawed 25 The Evolution of Circulars Copyright © 2011 The Nielsen Company Confidential and proprietary Optimizing print Key Points & Other Principles Overall lifts declining ... • Extended inventory Updated smartphone App — Smart Shopping Lists & QR Code Scanner Voice • Budgeting tools • Manufacturer’s coupons • Product information • Sharing • Store Item Finder beta...

Ngày tải lên: 05/12/2016, 17:38

... between the resistance of a single shaft and that of a group of shafts; The resistance of the underlying strata to support the load of the shaft group; The effects of constructing the shaft(s) on ... removal of 10-124 should be given to increasing the shaft diameter or increasing the number of shafts casing during installation of the rebar cage and concrete placement, construction of battered ... constructability of placing the column reinforcing in the shaft A horizontal construction joint in the shaft at the bottom of the column reinforcing will facilitate constructability Making allowance...

Ngày tải lên: 29/09/2013, 12:20

... Mutual Fund, (11) Industrial Finance Corporation of India, (12) National Housing Bank, (13) Shipping Credit and Investment Company of India Ltd., (14) Tourism Finance Corporation of India Ltd., (15) ... 13-121989 Method of Calculation of Interest on Premature Withdrawal/Discontinuance of Recurring Deposits and Charging of Penal Interest for the Defaulted Instalments of Recurring Deposits 114 ... working day at the originally contracted rate, (i) on the maturity value in the case of reinvestment deposits and recurring deposits, and (ii) on the original principal amount in the case of ordinary...

Ngày tải lên: 15/03/2014, 01:20

... contained in the remaining spectra then the FC determination error for that protein will be high This in turn will increase the rms However, in self validation, all the information contained in ... between the information contained in each data region This point is investigated further in the next section of the paper Estimating accuracy in the secondary structure determination of an unknown ... scaling factor determined by Fourier self-deconvolving the spectra, determining the tyrosine band area ratios at 1518 cmÀ1, and then using this as the scaling factor for subtracting the original...

Ngày tải lên: 16/03/2014, 18:20