# Question 3.4: Our firm has been hired to evaluate the anchorages for the m...

Our firm has been hired to evaluate the anchorages for the main cables of a historic suspension bridge.

Part of the assessment is to determine the force generated in one main cable due to the dead load of the bridge. A team member has already calculated the uniform distributed load, and we have the bridge dimensions from the Port Authority.

Our task is to find the cable force due to the dead load as it arrives at the anchorage. A team member is developing a computer model to perform a nonlinear analysis of the cable. We are providing an approximate solution to use for comparison.

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Question: 3.5

## The Port Authority for the bridge in Example 3.4 has received a request for a special permit for a heavy load to traverse the bridge. The gross vehicle weight is 300 kips, well above the 80-kip maximum for trucks without permits. Before the Port Authority will authorize the permit, they want to ...

Analysis: We assume that the cable shape remains p...
Question: 3.8

## Our company designs and manufactures pre-engineered steel buildings. The structural system uses tapered steel members to create a rigid frame with a pitched roof. The members become thinner near the top, so the frame behaves like athree-hinge arch. To design the connection between the vertical and ...

Analysis: FBD of AC: +\circlearrowright ΣM_...
Question: 3.7

## We are designing a new pedestrian bridge to cross a major highway. The architect and senior engineer have decided on a thrust arch with fixed supports. The deck widens from one end to the other, so the dead load is not uniform. Our team is still in the preliminary design phase, but the geotechnical ...

Analysis Approximate the fix-supported arch as a t...
Question: 3.6

## Our firm is designing a bridge to cross a large creek. The bridge will be a tied arch. In order to make a preliminary selection of member properties, the team needs to determine approximate internal forces. We have been tasked with finding the tie force and the vertical reactions at the abutments. ...

Analysis: Find the reactions: +\circlearrow...
Question: 3.3

## The owners of a zip line attraction want to know if they can increase the weight limit for riders from 100 kg to 120 kg. They recently purchased new equipment that is designed for the increase in rider weight. The question is whether the zip line and anchorages are strong enough. Part of the ...

Analysis: Find the location of zero slope: ...
Question: 3.2