Lecture 3

Question 1

ADTT

Answer 1

Average Daily Truck Traffic defined by Table 4.3

Question 2

The AASHTO pedestrian load on bridge sidewalk is

Answer 2

.075 ksf

Question 3

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

Answer 3

.085ksf

Question 4

Railing must be deigned to withstand

Answer 4

.050 ksf both transversely and vertically

Question 5

railing must also be deigned to handle a _____load.

Answer 5

.2 kip

Question 6

The deck overhang cantilever on the outside girder is designed for uniform ine load of

Answer 6

1 kip/ft located 1’ from curb

Question 7

The gravity load for design truck is outlined in

Answer 7

AASHTO A3.6.1.3.3

Question 8

The force on the truck F_r equation is defined as

Answer 8

m*V²/ r

Question 9

the multiple presence factor should be applied to the force of a braking truck

Answer 9

True

Question 10

the braking force shall be taken as______of the axle weights of the design truck or the design tandem placed in all lanes

Answer 10

25%

Question 11

Forces considered under lateral load

Answer 11

Fluid forces
Seismic Forces
Ice Forces

Question 12

What are the forces considered that cause deformation

Answer 12

Temperature
creep and shrinkage
settlement

Question 13

Temperature range for steel or aluminum

Answer 13

0-120F for moderate
-30-120F for cold

Question 14

Temperature range for concrete

Answer 14

10-80F for moderate
0-80 for cold

Question 15

The effect of creep and shrinkage can have an effect on structural…

Answer 15

Strength
Fatigue
Servicability

Question 16

Settlement occurs due to

Answer 16

Elastic and Inelastic deformation of the foundation

Question 17

What are som collision loads to consider in the dsign

Answer 17

Vessel
Rail
Vehicle

Question 18

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

Answer 18

Σ ηγQ

Question 19

η

Answer 19

Load modifier specified in article 1.3.2

Question 20

γ

Question 21

The number of design lanes should be determined by taking

Answer 21

w/12

Question 22

Live load force effect shall be determined by considering each possible combination of number of

Answer 22

number of loaded laned multiplied by a corresponding multiple presence factor

Question 23

Front axle weight of HL-93 design truck

Answer 23

8 Kip

Question 24

Rear axle weight of HL-93 design truck

Answer 24

32 Kip

Question 25

Distance between rear axles of design truck

Answer 25

14 to 30 feet

Question 26

Design lane load shall consist of

Answer 26

uniformly distributed load of .64Klf

Question 27

The tire contact area shall be

Answer 27

20” Wide 10” Long

Question 28

LLDF

Answer 28

Live load distribution factor

Question 29

The effect of forces tending to overturn a structure shall be calculated as a vertical upward wind load equal to

Answer 29

.020 ksf for strength III
.010 for service IV

Question 30

Influence Function

Answer 30

A function that represents the load effect at a point in the structure as a unit action moving along a path or over a surface