Lesson 3b 开孔补强.doc
?(?)?涨?淶?2:1?UG-36(b)?1. ? ? 60?(1250 mm)?粻?1/2?20?(508 mm)?2. ? ? 60?(1250 mm)?粻?1/3?40?(1000 mm)?3. ?UG-36?UG-43?1-7?1/2?油?UG-36(b)(2)(a-d)?UG-36(c)(3)?a) ?* 3-1/2 in. (89 mm) ?C ? ? 3/8 in. (10 mm)?* 2-3/8 in. (60 mm) ?C ? ? 3/8 in. (10 mm)?b) ?2-3/8 in. (60 mm).c) ?d) ? ? ? ? ?UG-36(d)?UW-14?UG-39(a)?粻?UG-36(c)(3)(a)?(b)?1/4?UG-37?Section VIII, Div. 1 UG-37?棺1. A1?2. A2?3. A3?4. A4?5. A5?UG-36(c)(1)?UG-16(e)?硣UG-40?d ?C?Rn + t + tn?2.5t2.5tn + te?Rn = ?tn = ?t= ?te= ?UG-41?fr =?Sn= ?Sv= ?fr?A = dtrF + 2tntrF(1-fr1)?fr1 = 1.0A = dtrFUG-39?UG-39(b)(1)?1/2?UG-34?A = 0.5dt + ttn(1 ?C fr1)?d= ?UG-37?壩t=?UG-34?UG-39(d)(1)?UG-39(c)?1/2?UG-39(c)(1)?14-20?2?UG-39(c)(2)?UG-39(c)(3)?U-2(g)?UG-39(b)(2)?*?1/2?1/4? ?2?A = 0.5dt?d=?UG-37?壩t=?UG-34?*?1/4 d avg. ? ? 2 d avg.
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Lesson
3b
开孔补强
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??????????????????????ò?????Ρ???????????????淶????????????????????????
???????????????????????????2:1??????????????????????????????????????Ρ?
UG-36(b)???????
1. ?????????? ? 60??(1250 mm)???????粻??????????1/2?????????20??(508 mm)??
2. ?????????? ? 60??(1250 mm)???????粻??????????1/3?????????40??(1000 mm)??
3. ??????????????????????????UG-36??UG-43????????????????1-7????????
???η???????ο????????????????????????????????????????????????????????1/2??????????????????????油?????UG-36(b)(2)(a-d)??
UG-36(c)(3)???????η????????????????????
??????????????????????????????????????????????????￡????????????????????????????
a) ?????????????????????????????????
* 3-1/2 in. (89 mm) ?C ??????????? ? 3/8 in. (10 mm)??
* 2-3/8 in. (60 mm) ?C ??????????? ? 3/8 in. (10 mm)??
b) ??????????????????????????????????????????2-3/8 in. (60 mm).
c) ?κ?????δ???????????????????С?????????????
d) ????????????????????????????δ???????????????С???
? ???????????????
? ?????????????????????
UG-36(d)
??????????????????UW-14??
UG-39(a)???????????????????
????????????粻????UG-36(c)(3)(a)??(b)??????????????????????1/4???????????????
?????????
UG-37???????????????????????????????
Section VIII, Div. 1 UG-37
?????
??????????????棺
1. A1??????????????????????
2. A2????????????????????????????????
3. A3????????????????????????????????
4. A4???????????????
5. A5???????????????
???????
??UG-36(c)(1)??????????????????????????UG-16(e)???????????????з????????????硣
UG-40???????
????????????е??????????????
d ?C????????????
Rn + t + tn
???????????е??????????С???
2.5t
2.5tn + te
??У?
Rn = ??????????
tn = ????????????????
t = ????????
te = ????????
?????????UG-41??
????????????????????????????????????????????????????????????????????????????????????????
???????????????????????????????????????????????????????????????
???????????
fr =
??У?Sn = ???????????????
Sv = ????????????????
??????????fr??????
A = dtrF + 2tntrF(1-fr1)
??????????????fr1 = 1.0
A = dtrF
UG-39??????????????????
UG-39(b)(1)???????
???????????????????????????????????1/2????UG-34????
A = 0.5dt + ttn(1 ?C fr1)
??У?
d = ??ο??????????????????????UG-37?????????????壩
t = ?????????????С??????
??
??UG-34??????????????[UG-39(d)(1)]??
UG-39(c)??????
??????п???????????????1/2??????????????????????
UG-39(c)(1)???????14-20?????д?????????Ρ?λ??????????????[???]?????????????2???й????????????????????????????????
UG-39(c)(2)?????????????????????Χ????????????
UG-39(c)(3)??????????????????????????и????????????????U-2(g)????
??????????????????
UG-39(b)(2)???????????????*
????????????????????????1/2???????????????????????????????1/4?????????????????? ????????????2????
A = 0.5dt
??У?
d = ??ο??????????????????????UG-37?????????????壩
t = ???????????С????????UG-34????
?????????????*
?????????????????
1/4 d avg. ? ??? < 2 d avg.
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