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Chapter 3 ? ? ? Action on the Bridge ? ? ? ? ? ?

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Title: Chapter 3 ? ? ? Action on the Bridge ? ? ? ? ? ?


1
Chapter 3 ? ? ? Action on the Bridge
? ? ? ? ? ?
  • SCHOOL OF TRANSPORTATION, WUT

    PRODUCED BYX J CHEN

2
The force applied on structure pointed or
distributed ??????????????(?????????)
Chapter 3 Action on the Bridge ??????
Introduction Action(??)
  • The factors that cause or constrain structural
    deformation ????????????????(????????????????
    ?)?

???????,????? ???????(??????) ???(JTG D62-2004)
  • SCHOOL OF TRANSPORTATION, WUT

    PRODUCED BYX J
    CHEN

3
Classification of the action ????? ????????
Chapter 3 Action on the Bridge ??????
Permanent Action (????)
Variable Action (????)
Action(??)
Accidental Action (????)
?????????(??????)????? Static Action (????)
Dynamic Action (????)
  • SCHOOL OF TRANSPORTATION, WUT

    PRODUCED BYX J
    CHEN

4
Chapter 3 Action on the Bridge ????
1 ???? ????(????????) ???? ???? ???? ?????????? ???? ??????
2 ???? ????(????????) ???? ???? ???? ?????????? ???? ??????
3 ???? ????(????????) ???? ???? ???? ?????????? ???? ??????
4 ???? ????(????????) ???? ???? ???? ?????????? ???? ??????
5 ???? ????(????????) ???? ???? ???? ?????????? ???? ??????
6 ???? ????(????????) ???? ???? ???? ?????????? ???? ??????
7 ???? ????(????????) ???? ???? ???? ?????????? ???? ??????
8 ???? ???? ????? ????? ????????? ???? ??? ????? ???? ??? ????? ?????
9 ???? ???? ????? ????? ????????? ???? ??? ????? ???? ??? ????? ?????
10 ???? ???? ????? ????? ????????? ???? ??? ????? ???? ??? ????? ?????
11 ???? ???? ????? ????? ????????? ???? ??? ????? ???? ??? ????? ?????
12 ???? ???? ????? ????? ????????? ???? ??? ????? ???? ??? ????? ?????
13 ???? ???? ????? ????? ????????? ???? ??? ????? ???? ??? ????? ?????
14 ???? ???? ????? ????? ????????? ???? ??? ????? ???? ??? ????? ?????
15 ???? ???? ????? ????? ????????? ???? ??? ????? ???? ??? ????? ?????
16 ???? ???? ????? ????? ????????? ???? ??? ????? ???? ??? ????? ?????
17 ???? ???? ????? ????? ????????? ???? ??? ????? ???? ??? ????? ?????
18 ???? ???? ????? ????? ????????? ???? ??? ????? ???? ??? ????? ?????
19 ???? ???? ????????? ??????
20 ???? ???? ????????? ??????
21 ???? ???? ????????? ??????
5
3.1 Permanent Action ????(??)
Chapter 3 Action on the Bridge ??????
The permanent action varies little in service
time ???????,??????????,??????????????????????
  • weight of the structure ?????
  • prestress ????
  • gravity of the soil ????
  • lateral force from the soil ????
  • shrinkage and creep of concrete??????????
  • deformation of the foundation??????
  • buoyancy????
  • SCHOOL OF TRANSPORTATION, WUT

    PRODUCED BYX J
    CHEN

6
3.2 Variable action (live load) ????(??)
Chapter 3 Action on the Bridge ??????
Variable action varies as the time
???????,????????,??????????????????????11?
  • Load of the motor ????
  • Impact ??????
  • Centrifugal force ??????
  • Braking ??????
  • Lateral force of the soil caused by the
    motor?????????
  • Load of the pedestrian ????
  • Wind ???
  • Hydraulic Pressure of flow????
  • Pressure of ice???
  • Temperature effect????
  • Friction of the bearing?????
  • SCHOOL OF TRANSPORTATION, WUT

    PRODUCED BYX J
    CHEN

7
Chapter 3 Action on the Bridge ??????
3.2.1 Load of the motor ????????????(??)
1 ) ????????????
??? ????????- ?????- ? ? Load of roadway
????(????????) Load of vehicle ????
???????????????,????????????????????????????????
???????????????????????????????????
NEXT
  • SCHOOL OF TRANSPORTATION, WUT

    PRODUCED BYX J
    CHEN

8
Chapter 3 Action on the Bridge ??????
3.2.1 Load of the motor ????????????(??)
2 ) ???????????
NEXT
  • SCHOOL OF TRANSPORTATION, WUT

    PRODUCED BYX J
    CHEN

9
Chapter 3 Action on the Bridge ??????
3.2.1 Load of the motor---- Load of roadway
????????
3 ) the form of Load of roadway ?????????
NEXT
  • SCHOOL OF TRANSPORTATION, WUT

    PRODUCED BYX J
    CHEN

10
Chapter 3 Action on the Bridge ??????
3.2.1 Load of the motor---- Load of roadway
????????
4 ) Standard Load of roadway ????????
??????? 10.5kN/m ???? ????????5m?,180kN
????????50m?,360kN ?????5?50m???,?????
????????1.2???? ??- ?
??????????????????????,???- ?????0.75??
NEXT
  • SCHOOL OF TRANSPORTATION, WUT

    PRODUCED BYX J
    CHEN

11
??? ?????
3.2.1 Load of the motor---- Load of roadway
????????
5 ) ?????????
????????????????????????????????????????????
????????????????
NEXT
  • SCHOOL OF TRANSPORTATION, WUT

    PRODUCED BYX J
    CHEN

12
Chapter 3 Action on the Bridge ??????
3.2.1 Load of the motor---- Load of vehicle
????????
6 ) ???????????? ??-?????-?????????????????
?
550kN??????
NEXT
  • SCHOOL OF TRANSPORTATION, WUT

    PRODUCED BYX J
    CHEN

13
Chapter 3 Action on the Bridge ??????
3.2.1 Load of the motor---- Load of vehicle
????????
7 ) ????????????
NEXT
  • SCHOOL OF TRANSPORTATION, WUT

    PRODUCED BYX J
    CHEN

14
Chapter 3 Action on the Bridge ??????
3.2.1 Load of the motor ????
8 ) transverse distribution of the Load of the
motor ????????????????????????????????????
? ? ? ? W(m) ? ? ? ? W(m) ???????
??????? ??????? ???????
Wlt7.0 7.0Wlt10.5 10.5Wlt14.0 14.0Wlt17.5 17.5Wlt21.0 21.0Wlt24.5 24.5Wlt28.0 28.0Wlt31.5 6.0Wlt14.0 14.0Wlt21.0 21.0Wlt28.0 28.0Wlt35.0 1 2 3 4 5 6 7 8
NEXT
  • SCHOOL OF TRANSPORTATION, WUT

    PRODUCED BYX J
    CHEN

15
Chapter 3 Action on the Bridge ??????
3.2.1 Load of the motor ????
9) ?????????? ???????????2???,??????????????????
?? ?????2???????,??,?2??????????
??? 2 3 4 5
6 7 8 ??????? 1.00 0.78 0.67
0.60 0.55 0.52 0.5
NEXT
  • SCHOOL OF TRANSPORTATION, WUT

    PRODUCED BYX J
    CHEN

16
Chapter 3 Action on the Bridge ??????
3.2.1 Load of the motor ????
10 ) ?????????
????????????????????????????L150m?,??????????
????????????????,????????????????????????????
? ??????
????L (m) ?????? ????L(m) ??????
150Llt400 400Llt600 600Llt800 0.97 0.96 0.95 800Llt1000 L1000 0.94 0.93
NEXT
  • SCHOOL OF TRANSPORTATION, WUT

    PRODUCED BYX J
    CHEN

17
Chapter 3 Action on the Bridge ??????
3.2.2 Impact caused by motor (Coefficient of
impact) ?????(????µ)
  • ????????
  • Cause ????
  • How to take into account of the impact? ?????
  • How to calculate the action? ????

NEXT
  • SCHOOL OF TRANSPORTATION, WUT

    PRODUCED BYX J
    CHEN

18
Chapter 3 Action on the Bridge ??????
3.2.2 Impact caused by motor (Coefficient of
impact) ?????(????µ)
2) Impact is related with the frequency of the
structure ?????????????
Coefficient of impact calculation based on the
present code
µ0.05

µ0.45
NEXT
  • SCHOOL OF TRANSPORTATION, WUT

    PRODUCED BYX J
    CHEN

19
Chapter 3 Action on the Bridge ??????
3.2.3 Load of the pedestrian ????
??
3kN/m2 2.5kN/m2
Width of the sidewalk ????
3kN/m2 2.5kN/m2
1.0kN/m
0.75kN/m
50m---????---150m
kurb??
Densely populated area ??????1.15???
Bridge for pedestrian only ????? 3.5kN/m2
????????
BACK
  • SCHOOL OF TRANSPORTATION, WUT

    PRODUCED BYX J
    CHEN

20
Chapter 3 Action on the Bridge ??????
3.2.3 Load of the pedestrian ????
??????????
1??????????????50m?,? 3.0KN/m2,
??????????150m?,? 2.5KN/m2,
?????????50m-150m???,???????
??????????,????????. 2? ????????????????1.15??
3???????,????????3.5KN/m2 ?
NEXT
  • SCHOOL OF TRANSPORTATION, WUT

    PRODUCED BYX J
    CHEN

21
Chapter 3 Action on the Bridge ??????
3.2.4 Other live loads ??
  • 1)??????
  • ?????????250m
  • ????

NEXT
  • SCHOOL OF TRANSPORTATION, WUT

    PRODUCED BYX J
    CHEN

22
Chapter 3 Action on the Bridge ??????
3.2.4 Other live loads ??
  • Centrifugal action
  • ????????
  • direction and location
  • ????????

A
A
R
A-A
BACK
  • SCHOOL OF TRANSPORTATION, WUT

    PRODUCED BYX J
    CHEN

23
2)Braking of motor ?????
Chapter 3 Action on the Bridge ??????
???? ??????????????????????10,???-1????
?????????165KN ??-2?????????????90KN
????,???????????????(2-23-2.344-2.64)?
1.2m
?????
?????
BACK
  • SCHOOL OF TRANSPORTATION, WUT

    PRODUCED BYX J
    CHEN

24
3)Load of Wind ???
Chapter 3 Action on the Bridge ??????
??????
????????????????????,????????????????????
BACK
  • SCHOOL OF TRANSPORTATION, WUT

    PRODUCED BYX J
    CHEN

25
Chapter 3 Action on the Bridge ??????
3.2.4 ??
4 ) ????(???)?????????
?????????????????????????
????????(???)???????????,????????????????,????????
??????????????????? ?????,???????????????????
???????,????????????????,?????????????
?????????????????????????????????????
???????,?????????????(???????????????)???
NEXT
  • SCHOOL OF TRANSPORTATION, WUT

    PRODUCED BYX J
    CHEN

26
Chapter 3 Action on the Bridge ??????
3.2.4 ??
4 ) ????(???)??????? ???????????,?????????
????????
???????????
???? ???? ?? ???? ?? ???????? ???????? ?????? ??????
???? ?? ?? ?? ?? ?? ??
???? 46 -43 39 -32 34 -23
???? 46 -21 39 -15 34 -10
???? 46 -9 (-3) 39 -6 (-1) 34 -3(0)
NEXT
  • SCHOOL OF TRANSPORTATION, WUT

    PRODUCED BYX J
    CHEN

27
Chapter 3 Action on the Bridge ??????
3.2.4 ??
4 ) ????(???)?????????
T1(?) T2(?)
????? 25 6.7
50mm???????? 20 6.7
100mm???????? 14 5.5
NEXT
  • SCHOOL OF TRANSPORTATION, WUT

    PRODUCED BYX J
    CHEN

28
Chapter 3 Action on the Bridge ??????
3.2.4 ??
4 ) ????(???)?????????
??????????????????,???????????,???????????T1???
????????,???H??400mm?,??AH-100(mm)??H???400mm?,A
300mm?????????????,A300mm?
?????????????????????????????????-0.5?
NEXT
  • SCHOOL OF TRANSPORTATION, WUT

    PRODUCED BYX J
    CHEN

29
3.3 Accidental Action ????
Chapter 3 Action on the Bridge ??????
An Accidental Action is such an action that it
occurs with uncertainty. If it occurs, it would
lasts for a very short time but with great
effects on the structure, even results in the
failure of the structure ?????????????????,?????
,???????????????????????????????????
  • Earthquake ????
  • ??????????0.10g?????????
  • Bump of the boat or float??????????
  • ?????????
  • Bump of the motor ??????
  • 1000KN(????)
  • 500KN(????)
  • SCHOOL OF TRANSPORTATION, WUT

    PRODUCED BYX J
    CHEN

30
Chapter 3 Action on the Bridge ??????
One typical case of the bridge failure resulted
from the bump of the boat ?????????????????????
  • SCHOOL OF TRANSPORTATION, WUT

    PRODUCED BYX J
    CHEN

31
3.4 Effect Combination of the actions ??????
Chapter 3 Action on the Bridge ??????
All the actions will not always occur and will
not occur in the same time. So to find
combination of different action is necessary.
?????????????????????,????????????????????
3.4.1 Review of the design method ??????
Design theory for the bridge structure?????????
A)allowance stress method???????????? B)ultimat
e state method?????????????????????
????????
?????????
  • SCHOOL OF TRANSPORTATION, WUT

    PRODUCED BYX J
    CHEN

32
3.4 Effect Combination of the actions ??????
Chapter 3 Action on the Bridge ??????
3.4.1 Review of the design method ??????
The ultimate state is the specific state for the
structure or its component that when beyond the
state border ,the structure or its component
would not satisfy the function set by the design
code. ????????????????????,????????,??????????????
???????? ??? ???????????(????????)
???????????????(??????????)
  • SCHOOL OF TRANSPORTATION, WUT

    PRODUCED BYX J
    CHEN

33
3.4 Effect Combination of the actions ??????
Chapter 3 Action on the Bridge ??????
3.4.1 Review of the design method ??????
????????????????????,??????3?????
1)????(????????)????????????
2)????(????)??????????????

3)????(????)????????????

  • SCHOOL OF TRANSPORTATION, WUT

    PRODUCED BYX J
    CHEN

34
3.4 Effect Combination of the actions ??????
3.4.1 Review of the design method ??????
?????
???????,???????????????? 1.
???????????????? 2. ??????????????????????????
??????????? ????????????????????????????????????
??? ?????????????(??)?????,????????????????????
(???)?????,????????????????? 3. ??????????????
35
3.4.1 Review of the design method ??????
????????
1 ?????????,?????(????????),?????????????????????(
????)????? 2? ?????????????????
??????????????????????? ???????????????????
????? 3 ????????????,????????????? 4
???????????????????????????
36
3.4 Effect Combination of the actions ??????
Definition
???????????????????,????????????????????????????
??????????????????????????
SCHOOL OF TRANSPORTATION, WUT

PRODUCED BYX J
CHEN
37
3.4 Effect Combination of the actions ??????
The principles of the Effect Combination of the
actions ?????????
1)???????????????,?????????????????????????????
?,?????????????????????
2)?????????????????????,??????????
3)???????????,???????????????,??????????????????
????????
4)??????????????
5)?????????????????????????????????,???????????
????????????????????????????????????????????????
???????????????
SCHOOL OF TRANSPORTATION, WUT

PRODUCED BYX J
CHEN
38
3.4 Effect Combination of the actions ??????
Chapter 3 Action on the Bridge ??????
3.4.2 Combination under the ultimate state of
capacity?????????????????????
(1)Primary Combination ????
???????????????????????,?????????
  • SCHOOL OF TRANSPORTATION, WUT

    PRODUCED BYX J
    CHEN

39
3.4 Effect Combination of the actions ??????
Chapter 3 Action on the Bridge ??????
3.4.2 Combination under the ultimate state of
capacity?????????????????????
(1)Primary Combination ????
???????,????1.0.9?????????????????????????????
?????1.1?1.0?0.9 ??????(??????????)?????,?1.
4?????????????????????????,??????????,????????????
??????????????????????,???????????????????
???????????????(??????????)?????????j???????(?????
4.3.5???????????????????????????)?????,?1.4,??????
????1.1
  • SCHOOL OF TRANSPORTATION, WUT

    PRODUCED BYX J
    CHEN

40
(1)Primary Combination ????
???????(????)
  • 1.2???1.4 ????
  • 1.2 ???1.4 ????0.8 1.4 ????
  • 1.2 ???1.4 ????0.7 (1.4 ????
  • 1.1 ???)
  • 1.2 ???1.4 ????0.6 (1.4 ????
  • 1.1 ??? 1.4 ???)
  • 1.2 ???1.4 ????0.5 (1.4 ????
  • 1.1 ???1.4 ???1.4 ?????)

SCHOOL OF TRANSPORTATION, WUT

PRODUCED BYX J
CHEN
41
3.4 Effect Combination of the actions ??????
Chapter 3 Action on the Bridge ??????
3.4.2 Combination under the ultimate state of
capacity Accidental Combination ????
?????????????????????????????????????
????????????1.0??????????????,???????????????????
?? ???????????????????????JTJ004?????
  • SCHOOL OF TRANSPORTATION, WUT

    PRODUCED BYX J
    CHEN

42
3.4 Effect Combination of the actions ??????
Chapter 3 Action on the Bridge ??????
3.4.3 ???????????? ?????????????
(1)????????
??????????????????????,?????????
  • SCHOOL OF TRANSPORTATION, WUT

    PRODUCED BYX J
    CHEN

43
3.4 Effect Combination of the actions ??????
Chapter 3 Action on the Bridge ??????
3.4.3??????????????????
(2)????????
???????????????????????,?????????
  • SCHOOL OF TRANSPORTATION, WUT

    PRODUCED BYX J
    CHEN

44
3.4.3 ??????????(????)
?????????
???0.7 ????(?????) ???0.7 ????(?????) 1.0
????
?????????
???0.4 ????(?????) ???0.4 ????(?????) 0.4
????
SCHOOL OF TRANSPORTATION, WUT

PRODUCED BYX J
CHEN
45
3.4 Effect Combination of the actions ??????
Chapter 3 Action on the Bridge ??????
??
?????,??????????,? ?????????????? ???????????
??????????? ??????????????????,???????????,??
???????????,???????????????????????,??????????????
???,????????????,?????????????,????????,??????????
?? ?????????????????,?????????????????
  • SCHOOL OF TRANSPORTATION, WUT

    PRODUCED BYX J
    CHEN

46
Review ????
  • ???????
  • ????(7?)
  • ????(?????????????)
  • ????
  • ??????(4?????????????)
  • SCHOOL OF TRANSPORTATION, WUT

    PRODUCED BYX J
    CHEN
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