sổ tay tra mác thép thế giới
Sổ tay tra cứu transistor
Ngày tải lên :
12/10/2012, 15:30
... 2SC4891-SAN
2SC5294-MAT Transistor au Silicium NPN TRANSISTOR
2SC5296-SAN Transistor au Silicium NPN+Diode 1500V 8A 60W
2SC5297-SAN Transistor au Silicium NPN 1500V 8A 60W
2SC5299-SAN Transistor au ...
2SC3831-SKN Transistor au Silicium NPN 500V 10A 100W
2SC3833-SKN Transistor au Silicium NPN 500/400V 12A 100W
2SC3842-FUJ Transistor au Silicium NPN 600V 10A 70W 32MHZ
2SC3844-FUJ Transistor ...
2SC3886A Transistor au Silicium NPN 1500V 8A 50W 0.1us
2SC3886A/DIV Transistor au Silicium NPN 1500V 8A 50W 0.1US
2SC388A-MBR Transistor au Silicium NPN 25V 50mA 0.3W 300MHz
2SC3890-SKN Transistor...
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- 20.6K
- 50
Sổ tay kết cấu thép - Section 1
Ngày tải lên :
18/10/2012, 16:13
... large amount of strain hardening.
The strain at which strain hardening begins (
⑀
st
) and the rate at which stress increases
with strain in the strain-hardening range (the strain-hardening modulus ... stress-strain curve. Also, the value of true strain
at fracture is much greater than the engineering strain at fracture (though until yielding begins
true strain is less than engineering strain).
1.8 ... members causes, in adjacent
restrained metal, strains that can exceed the yield-point strain. In thick material, triaxial
stresses may develop because there is restraint in the thickness direction...
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Sổ tay kết cấu thép - Section 2
Ngày tải lên :
18/10/2012, 16:13
... abutting cross-sectional configurations is made
unless specifically required by the contract documents. The as-fabricated straightness toler-
ances of members are one-half of the standard camber and sweep ... are
pulled into plumb. It is necessary, therefore, to erect from the more restrained portion of the
framing to the less restrained. If a structure has a braced center core, that area will be erected
first ... welding may be direct or alternating
current. With direct current, either straight or reverse polarity may be used. For straight
polarity, the base metal is the positive pole and the electrode is...
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Sổ tay kết cấu thép - Section 3
Ngày tải lên :
18/10/2012, 16:13
... strain in the x direction is accompanied by lateral
strains of opposite sign. If
⑀
x
is a tensile strain, for example, the lateral strains in the y and
z directions are contractions. These strains ... top.
The plane where the strain is zero is called the neutral axis. Below the neutral axis, tensile
strains act, increasing in magnitude downward. With use of the stress-strain relationship of
the ... distance y from the neutral
axis
b(y)
ϭ
width of beam at distance y from the neutral axis
ƒ(y)
ϭ
normal stress at a distance y from the neutral axis
c
b
ϭ
distance from neutral axis to beam bottom
c
t
ϭ
distance...
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Sổ tay kết cấu thép - Section 4
Ngày tải lên :
18/10/2012, 16:13
... roof decking to distribute loads transversely
to the chords (Fig. 4.26b).
A folded-plate structure has a two-way action in transmitting loads to its supports. In the
transverse direction, the plates ... eliminates
the need for such equations.
Figure 4.27a shows a transverse section through part of a folded-plate structure. An
interior element, plate 2, transmits the vertical loading on it to joints 1 and ... resisting only tension, it is limited to
transferring forces only along its length. The vast majority of structures require a more
complex ability to transfer forces. Thus it is logical to combine...
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Sổ tay kết cấu thép - Section 5
Ngày tải lên :
18/10/2012, 16:13
... and axial transfer force. The transfer force, sometimes called ‘‘drag’’ or ‘‘drag
through’’ force, is the axial force that must be transferred to the opposite side of the
column. The transfer ... section are prohibited.
Groove welds also are classified as complete-penetration and partial-penetration welds.
In a complete-penetration weld, the weld material and the base metal are fused through-
out ... CONNECTIONS
5.33
welds. The transverse spacing of longitudinal fillet welds in end connections should not
exceed 8 in unless the design otherwise prevents excessive transverse bending in the con-
nections.
5.20...
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Sổ tay kết cấu thép - Section 6
Ngày tải lên :
18/10/2012, 16:13
... neutral axis, and (2) secondary moments
produced in a member of a rigid frame due to sidesway of the frame that creates eccentricity
⌬
of the axial compression load with respect to the neutral ... Stability Research Council for use with six idealized conditions of rotation and
translation at column supports are illustrated in Fig. 6.4 (see also Arts. 7.4 and 7.9).
The axially compression strength ... materials handling systems
S
ϭ
roof snow load
R
ϭ
rain load
W
ϭ
wind load
E
ϭ
earthquake load
T
ϭ
restraint loads
Instead of the factors 0.75 and 0.66, allowable stresses may be increased one-third...
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Sổ tay kết cấu thép - Section 7
Ngày tải lên :
18/10/2012, 16:13
... a concentrated load occurs on a beam, the number of shear connectors between
the concentrated load and the inflection point should be adequate to develop the maximum
moment at the concentrated ... or by longitudinal welds in combination with transverse welds:
A
ϭ
A
g
2
ϭ
gross area of member, in
(c) When the tension load is transmitted only by transverse welds:
2
A
ϭ
area of directly connected ... of loading, in
(a) When the tension load is transmitted only by bolts or rivets:
A
ϭ
A
n
2
ϭ
net area of the member, in
(b) When the tension load is transmitted only by longitudinal welds to other...
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Sổ tay kết cấu thép - Section 8
Ngày tải lên :
18/10/2012, 16:13
... bending stresses.
Lateral loads in the transverse direction are transferred to the truss top chords via dia-
phragm action of the floor deck. These loads are transmitted through the depth of the ... trusses
to the bottom chords and are then transferred through the floor deck at that level to the
adjacent-truss top chords. The overturning couple produced by the transfer of lateral load
from the top ... ends of the
truss. Only axial forces are induced in the exterior columns. Therefore, transverse lateral
loads are transmitted down through the structure without creating bending stresses in the
trusses...
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Sổ tay kết cấu thép - Section 9
Ngày tải lên :
18/10/2012, 16:13
... more common in buildings where the lateral resistance was concentrated in
limited portions of the structure, since this concentration produces larger member sizes. The
redundancy factor described ... ƒ
j
(t)
for each mode of vibration. Figure 9.7 shows the design response spectra recommended by
the UBC unless site-specific spectra are employed. The response is based on calculations of
the single-degree-of-freedom ... concentrate the inelastic deformation (ductility demand) into a small portion of the
structure. This can dramatically increase the ductility demand for that portion of the structure.
This concentration...
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Sổ tay kết cấu thép - Section 10
Ngày tải lên :
18/10/2012, 16:13
... fused area at plane of maximum shear transfer
ϭ
0.7d
Ϫ
1.5t but
Յ
0.55d
t
ϭ
total base steel thickness of sheets involved in shear transfer
See Fig. 10.9 for illustration of diameters d, d
a
, and ... fully effective. To do this, first determine
the location of the neutral axis. Because the top flange is not fully effective, the neutral axis
will be located below the centroidal axis of the gross ... weld
t
e
ϭ
effective throat dimension
10.17.2 Fillet Welds
Fillet welds are considered to transmit longitudinal and transverse loads with shear stresses.
For these welds, the nominal strength is the...
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Sổ tay kết cấu thép - Section 11
Ngày tải lên :
18/10/2012, 16:13
... for Highway Bridges,’’ American
Association of State Highway and Transportation Officials.
100 psf transverse
40 psf longitudinal
Transverse and longitudinal loads should be applied simultaneously.
Wind ... BRIDGES
11.9
represents forces from an automobile or pickup as in PL-2, in addition to a 50,000-lb van-
type tractor-trailer traveling at 50 mph and impacting at an angle of 15
Њ
.
The performance criteria require ... penetrate or hurdle
the railing, must remain upright during and after the collision. and be smoothly redirected
by the railing. Thus, a rail system that can withstand the impact of a tractor-trailer...
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Sổ tay kết cấu thép - Section 12
Ngày tải lên :
18/10/2012, 16:13
... computations of neutral-axis location and
section moduli for the composite section are tabulated in Table 12.2. To locate the neutral
axis, moments are taken about the neutral axis of the rolled ... for
the location of the neutral axis and for the section moduli S
st
and S
sb
of the trial plate-girder
section are tabulated in Table 12.17.
For unsymmetrical girders with transverse stiffeners but ... effects of creep. The computations of neutral-axis location and
section moduli for the composite section are tabulated in Table 12.8. To locate the neutral
axis, moments are taken about middepth...
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Sổ tay kết cấu thép - Section 13
Ngày tải lên :
18/10/2012, 16:13
... Reinforced
concrete decks may be transverse, longitudinal or four-way slabs.
ã
Transverse slabs are supported on stringers spaced close enough so that all the bending in
the slabs is in a transverse direction.
ã
Longitudinal ... with a concentrated load at top-chord level and rigid connection
to a floorbeam. This system offers elastic restraint to buckling of the top chord. The analysis
of elastically restrained compression ... should be made to
determine the best position for the trusses.
Train weight on a bridge on a curve is not centered on the centerline of track. Loads are
greater on the outer truss than on the inner...
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Sổ tay kết cấu thép - Section 14
Ngày tải lên :
18/10/2012, 16:13
... panels at 27.8 ft
SPAN: 778 ft RISE: 151 ft RISE / SPAN
ϭ
1:5.2
NO. OF LANES OF TRAFFIC: 4, including 2 street-railway tracks
HINGES: Two CROWN DEPTH: 25 DEPTH/ SPAN
ϭ
1:31
AVERAGE DEAD LOAD: LB ... Washington Department of Transportation
ENGINEER: Bridges and Structures Division, Washington DOT
FABRICATOR: Northwest Steel Fabricators, Vancouver, Wash.
GENERAL CONTRACTOR: Dale M. Madden, ... solid-ribbed arch, 15 panels at 50 ft
SPAN: 750 ft RISE: 124.4 ft RISE / SPAN
ϭ
1:6
NO. OF LANES OF TRAFFIC: 6 plus 10-ft berms
HINGES: 0 CROWN DEPTH: 4 ft DEPTH / SPAN
ϭ
1:187
AVERAGE DEAD LOAD:...
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