Bridge Design

Your objective is to create an optimal bridge design. An optimal design is one that

• satisfies all of the design specifications and passes a simulated

• passes a simulated and costs as little as possible.

• satisfies all of the design specifications, passes a simulated , and costs as little as possible.

• satisfies all of the design specifications and costs as little as possible.

The site configuration consists of:

A Elevation of the deck above the high water level

B Choice of standard abutments/(simple supports) or (arch supports)

C Height of arch abutments (if used)

D Choice of a pier or no pier

E Height of pier (if used)

F Choice one or two cable or no cable

G All of the above

• A, B and E

• E, D and A

• A, B, D and E

• G

The load case consists of:

A Choice of medium-strength or high-strength concrete

for the deck.

B Choice of two H25 truck , one in each traffic lane; or

C one single 660 Permit Loading, laterally centered on the deck.

• A and C

• A and B

• B or C

• A, B and C

True or False

The Member List is a movable grid that is normally displayed on the right-hand side of the Bridge Design Window. When in use, the Member List reduces space available for the Drawing Board; however, it can be easily hidden in order to view or edit the structural model.

• True

• False

In the Member List, load test results are shown as a ratio of member force to strength, for both compression and tension. Thus, if the ratio is greater than 1, the member is ___________ .

Members that are unsafe in tension are highlighted in ____________; those that are unsafe in compression are highlighted in _______.

To select a member, click anywhere within the corresponding row of the Member List. A selected member is highlighted in________ ________, both in the Member List and on the Drawing Board.

To select more than one member simultaneously, hold down the _______ key while clicking the Member List.

There are several approaches you might use to minimize material cost. The following procedure is recommended for inexperienced designers: Start by using the lowest cost (but weakest) available material--__________ steel--for all members.

It is usually best to use solid bars for tension members

and _____________ tubes for compression members.