5.1 5.2 5.3 5.4 5.5 5.6

5.1

5.1.11.2.3.4.

5-1 L L(5-1)

5-2 (5-2)(5-2)

2.5-3

5-4 5

5-5 5-6

5-7 3.

5-8 4.

.

5.1.2

2..

(1) (2) (3) (4) (5) 67

5-10 5-11 (1)

(2) 5-12

(3) 5-13

(4) 5-14

(5)

5.1.3

5-15 5-16 5-17 15-1525-1635-17

5.2

3

4

5

1 2

---5.2.1

5-1 5-1 (m)

5.2 5.2

5.2.2

5-3 Ll

88L5-18l5-18Lll5-35-18

2.

HB5-4 5-4

3.

115m70mm15m67895m4m3m2m20mm2---70%50%70mm3489

5.2.3

1C30C209C608C70 2 HRB335HRB400HPB235HRB335HRB4001.251.3 3

5.2.4

6789(m)30>3030>3030>3025--(m)60>6060>6060>6050(m)80>8080>8080>8060----

5.2.5

12.52V 0.20 fcbh0 (5-1) 22.52 V 0.15 fcbh0 (5-2)

5.3

300mm ,(4) 1IV23455.3.1

5.3.2

Dijij iQiQijQij

2.

D

1

5-19 (1)(2) 2/3 5-19

nmjVjjVj1, Vj2, ..., VjmVj = Vjk j(5-5)(5-6)ijkjkhjj

k=1, , m 5-65-5jj5-6j(5-7)

MbMb

2D

D D(5-8)

,1ABhjicj2ABEBBFGAAHi1i2i3i4 5-9 i = i1 + i2 + i3 + i4 5-105-20 D

5-205-21 5-21 D5-21aK=(i1+i2)/ic=(0.5+K)/(2+K)5-21bK=(i1+i2)/ic=0.5K/(1+2K)5-21cK=(i1+i2+ip1+ip2)/(2ic)=K/(2+K) 5-205-21

Djk5-11

5-225-22 123

yh

yh = (y0 + y1 + y2 + y3)h

5-12

5.3.3

5.3.4

1

0.155-1395-14Mc Mb Mbua c14121l

(2)

1 2.5VvbMbl Mbr/ln VGb 9V 1lMbual Mbuar)/lnVGb (5-15)(5-16)

V ln VGb9 MblMbr MbualMbuar vb131211

2Vvc( MctMcbHn 9Vl2McuatMcuabHn (5-17)(5-18)V vc14121l MctMcb Mcuat Mcuab Hn

2.

(1)

xx 0.25h0 x 0.35h0 5-19 5-20 h0

12.52V22.525-215-225-23

(2)

VcVs0.65-24

5-24VbVc 5-25 1=13=3NN0.3fcAN=0.3fcA5-26 0.36ftbh0N

(3)

200mm44 bb 2bc5-27 bb bc + hb5-28 hb 16d 5-29

10.50.3 22141/4212 31/201/20

15-62%2mm 2200mm20250mm20300mm5-6

1300mm350mm 22 33 n5-30 n n

5-7 1.05IV5-7

1 2400mm200mm 35-80.2%IV0.1 45% 521.2% 630%5-8 %

5-9 5-9 5-910150mm400mm628

200mm250mm20300mm 5-31 v5-10 0.8%0.6%0.4%0.4%5-31C35C35fyv360N/mm2360N/mm2 5-100.021.5%21.2%91.5%

5-10 v

5-100.021.5%21.2%91.5%

10d15dd3%

5.3.4

5-23 5-23

2.

(1)(2)(3)(4)

3.

1 2970

4.

(1)

fyk 5-24

Mcb = McuMct = Mcl Mcl + Mcu = Mbl + Mbr

19 5-38Vj5-37 5-38 5-40Vj

25-39b1.351.25-40

(2)

VjVj Vju 5-41 Vju5-42 95-43

(3)

5-44

5.3.5

6789

75%65%

2.

0.550.755-45 xx0.25h0x0.35h02.5% 1.00.80.2%

3.

1.00.2%4.

5-115-11

5.4

5.4.1

1622350%24m

5.4.2

5-46 IA/IIA

5-47 5-48 340.8570.8580.95 m Ibjj aj cjj Ijj I j

abcd 5-25

2.

3.

5-50 IcIgfyMPaPu fcAg

1 EcIeq5-51 25-54 3-- 5-55 5-56

5.4.3

FVMiFiViMi5-57 Iii Ii

1 2j 5-58 j 5-59 3

5.4.4

VvwVw 9 V 1.1 Vw 5-60 5-61 V Vw Mwua Mw vw161412

2.

160mm1/20140mm1/201/16200mm1/10 140mm600mm6mm

10.25%0.20%8300mm20.3%200mm31/10

90.480.50.6

15-145-1423 5-14

980.10.20.3

5-2615-155-16 2

5-15 lcv

98v0.20.20.2lc0.25hw0.20hw0.20hwlc0.20hw0.15hw0.15hw132 2lc1.5bw450mm300mm 3v360N/mm2360N/mm2 100mm150mm 4hw

5-16

5-26

5-27

5.5

5.5.1-

--- 1

2

3

4300mm

55400mm

5.5.2

5.5.3

()

(1)

()(a)(b)(c); ()(d)(e)

15-2825-29

5-28

5-29

1)

5-30 --5-30

CFEcIeqQF5-30MwQw5-625-635-645-65

pwpw(x)5-305-66pp5-63 5-665-695-675-68

-- ABC1C2u1()

= 0 u(0) = 0 = 0 = H ()()() = H = H P

u(x) uuu 1. 2. 3.

2 5-32

--5-331/4 5-33 ab

b = 05-825-83

Mijm'ijhnm n2mijm12m211mijm125-845-865-85

5-34 5-34xQmpm5-87

5-665-67pp(x) , pm(x)

1 2 u 5-94 5-95

xQp:5-96 5-97 5-98 5-99

1uMwQw ' 25-983CFQFm45-95Qw5-100 5-101

(2)

ijQijiQimn5-102 5-103

-- 1Vf 0.2V02Vf < 0.2V0VfV0VfmaxVf 5-104

5.5.4

--1160mm1/2022bwbw3bw32.5bw45

5.6

3%HRB3352.6%HRB4002mm C60C65-C700.05C75-C800.1 C600.1%

0.60.020.60.03 0.02