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Vinvika [58]
3 years ago
9

Anh/chị hãy trình bày cấu trúc hệ thống điều khiển ổn định điện áp. Hãy nêu các thành phần cơ bản chính trong hệ thống điều khiể

n này tương ứng với
sơ đồ hệ thống điều khiển tự động vòng kín và các thiết bị thường dùng tương ứng với các thành phần đó.
Engineering
1 answer:
ryzh [129]3 years ago
3 0

Answer:

do te ghjvbkiyrbkknbggvnjjhgcvnjjgvbbhh

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A rectangular beam having b=300 mm and d=575 mm, spans 5.5 m face to face of simple supports. It is reinforced for flexure with
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Answer:

provide 180 mm spacing

Explanation:

GIVEN DATA

rectangular beam: (b) = 300 mm, (d) = 575 mm

reinforced for flexure = 4Ф32 bars

WD = 30 kN /m,  WL = 45 kN/m

Wu = 1.4 * 30 + 1.6 * 45 = 114 kN/m

i) concrete shear stress ( vc)

100 Ac / bd = (100 * u * \frac{\pi }{4} *  32^2) / 300 * 575 = 1.865

from table 3.8

when:  100 Ac / bd = 1.865  then Vc = 0.778 N/mm^2

Ultimate shear force = (114 *5.5) / 2 = 313.5 kN

design shear stress =  V / bd = (313.5 * 10^3) / (300 * 575) = 1.82 N/mm^2

v < 0.8\sqrt{22}   =      1.82 < 3.75

design link provided  according to

Asv / sv =  b(v-vc) / 0.87 fy  = 300(1.82 - 0.778) / 0.87 (420)

ASv / Sv = 0.855

From table 3.13 :the value of Asv / sv can be calculated as

\frac{0.855 - 0.785}{0.897 - 0.785}  = \frac{x - 200}{175 - 200}

x = (-25) [ 0.625] + 200 = 184.375 mm

provide 180 mm spacing

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