AASHTO

Question 1

what table has table for live load distribution for moment in interior beams

Answer 1

4.6.2.2.2b-1

Question 2

what table has table for live load distribution for moment in exterior beams

Answer 2

4.6.2.2.2d-1

Question 3

what table has table for live load distribution for skewed bridges

Answer 3

4.6.2.2.2e-1

Question 4

The AASHTO pedestrian load on bridge sidewalk is

Answer 4

.075 ksf

Question 5

If load is applied to the bridge restricted to pedestrians and bicycles then the load will be

Answer 5

.085ksf

Question 6

Railing must be deigned to withstand

Answer 6

.050 ksf both transversely and vertically

Question 7

The gravity load for design truck is outlined in

Answer 7

AASHTO A3.6.1.3.3

Question 8

The total factored force effect “Q” shall be taken as

Answer 8

Σ ηγQ

Question 9

η

Answer 9

Load modifier specified in article 1.3.2

Question 10

γ

Answer 10

Load factor specified in table 3.4 1-1 to1-5

Question 11

Strength 1

Answer 11

Basic load combination use of bridge without wind

Question 12

Strength 2

Answer 12

Load combination relating to the use of the bridge by owner specified special design vehicles

Question 13

Strength 3

Answer 13

load combination relating to the bridge exposed to the design wind speed

Question 14

Strength 4

Answer 14

Load combinations emphasizing dead load force effects in bridge superstructures

Question 15

Strength 5

Answer 15

Load combination relating to normal vehicular use of the bridge with 80mph wind velocity

Question 16

Extreme event 1

Answer 16

load combination including earthquake

Question 17

Extreme event 2

Answer 17

Load combination relating to ice load, Collison by vessels and vehicles, floods, and certain hydraulic events with a reduced live load

Question 18

Service 1

Answer 18

combination relating to the normal use of the bridge with a 70 mph wind. Also related to deflection control in buried metal structures, tunnel liner plate, etc

Question 19

what table has table for load combinations and load factors

Answer 19

AASHTO Table 3.4.1-1

Question 20

what table has table load factors for permanent loads

Answer 20

AASHTO Table 3.4.1-2

Question 21

Service 2

Answer 21

Load combination intended to control yielding of steel structures and slip critical connections due to vehicular live load

Question 22

Service 3

Answer 22

Load combination for longitudinal analysis relating to tension in prestressed concrete superstructures with the objective of crack control

Question 23

Service 4

Answer 23

Load combination relating only to tension in pre stressed concrete columns with objective of crack control

Question 24

Define the permanent load Abbreviations ES,EV,PS,SH

Answer 24

ES= Earth surcharge load
EV= Vertical pressure from dead load of earth fill
PS= Secondary forces from post tensioning for strength limit states; total prestress forces for service limit state
SH= Force effects due to shrinkage

Question 25

Define the permanent loads: CR,DD,DC,DW,EH

Answer 25

CR = Force effects due to creep DD= Downdrag force DC= Dead load of structural components and non structural attachments DW= Dead load of wearing surfaces EH= Horizontal Earth pressure load

Question 26

Define the transient loads: BL,BR,CE,CT,CV

Answer 26

BL= Blast Loading BR= Vehicular braking force CE= Vehicular centrifugal force CT= Vehicular collision force CV= Vessel collision force

Question 27

Define the transient loads: EQ,FR,IC,IM,LL,LS

Answer 27

EQ= Earthquake load FR= Friction load IC= Ice load IM= Vehicular dynamic load allowance LL= Vehicular live load LS= Live load surcharge

Question 28

What is the

Question 29

Load factor for DC strength 4

Answer 29

Max=1.5 Min = .90

Question 30

Load factor for DD with the Tomlinson method

Answer 30

Max=1.40 Min = .25

Question 31

Load factor for DW

Answer 31

Max=1.5 Min = .65

Question 32

Load factor for EH Horizontal earth pressure that is active

Answer 32

Max=1.5 Min = .90

Question 33

Load factor for EH Horizontal earth pressure that is at rest.

Answer 33

Max=1.35 Min = .90

Question 34

Load factor for DW

Answer 34

Max=1.5 Min = .65

Question 35

Unit weight of Bituminous wearing surfaces

Answer 35

.140 kcf

Question 36

Unit weight of lightweight concrete

Answer 36

.110 to .135 kcf

Question 37

Unit weight of normal concrete f'<= 5ksi

Answer 37

.145 kcf

Question 38

Unit weight of normal concrete f'<= 15ksi but more than 5

Answer 38

.140+.001f'_c

Question 39

Unit weight of compacted sand

Answer 39

.120 kcf

Question 40

Unit weight of steel

Answer 40

.490 kcf

Question 41

Unit weight of transit rails, ties and fastening

Answer 41

.200 kcf

Question 42

The number of design lanes shall be taken as

Answer 42

w/12 Where w IS the clear roadway width in feet between curbs, barriers, or both

Question 43

Vehcicular live loading on the roadway of bridges or incidnental structures are designated as ______and shall consist of the combination of ________

Answer 43

HL-93, Design truck or design tandem, and design lane load.

Question 44

The distribution Factor is defined as

Answer 44

g = M_{refined analysis} / M_{beam analysis}

Question 45

Limitations on the use of distribution factors

Answer 45

1. Constant cross section 2.Number of beams is four or more 3. Beams are parallel and have approximately the same stiffness 4. Roadway cantilever does not exceed 3' 5. Plan curvature is small 6. Cross section is as defined as in tables

Question 46

Live load distribution factors for moment in interior beam can be found on table

Answer 46

4.6.2.2.2

Question 47

Live load correction factors for shear in obtuse center can be found on table

Answer 47

4.6.2.2.1