The column and beam supporting the road sign below are subjected to: • Bending due to the weight…

Question 1: (5 marks)

The column and beam supporting the road sign below are subjected to:

• Bending due to the weight of the sign and the beam,

• Torsion due to horizontal wind forces blowing on the face of the sign.

The sign dimensions are 4.5m wide x 1.4m high. The wind exerts a horizontal pressure of 2.5 kPa

normal to the sign face (ignore wind pressure on the beam and column). The beam is 8m long

(measured to the column centreline). The vertical distance from the foundation to the centreline of the

beam is 5.2m. The sign weighs 350 kg.

Both the column and the beam are made of steel box section SHS350x10.

Use nominal loads in all calculations and convert the wind pressure on the sign and the dead load

of the sign as point loads acting at the centre of the sign. Assuming the column is rigidly connected

to the footing and:

1. For both planes, draw bending moment diagrams for dead load and wind load.

2. Find the member torsion diagram for the column.

3. Change the condition at the footing from rigid to pin what will happen? State a discussion

paragraph explaining the error.

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Internet Grocer, Inc. was formed in 1993 to capitalize on a perceived opportunity that would… 1 answer below »

Internet Grocer, Inc. was formed in 1993 to capitalize on a perceived opportunity

that would result from growing use of the Internet. The concept for the venture was

based on the founders’ belief that significant unserved demand exists for home delivery

of groceries. They believe that expanding use of the Internet will prove to be the critical

success factor for a grocery home delivery venture.

Traditionally, home delivery of groceries has not been economical except in a few

unusual markets. While the concept of home delivery is attractive to consumers, attempts

to offer home delivery generally have not been successful. Most efforts have been

carried out by individual grocery stores base on telephone orders from their customers.

Taking orders by phone is time consuming for both the customer and the merchant,

products selected by the grocer for delivery often do not measure up to the customer’s

expectations, and it is difficult for customers to “shop” without being able to browse

through store aisles. As a result, customers might experiment with home delivery, but

usually would revert back to shopping at the store after a couple of attempts.

The founders of Internet Grocer see the Internet as the key to building a viable

home delivery business on a large scale. Using the Internet, a customer could shop in a

virtual grocery store at any hour. A customer’s order history could be saved and used as

a reminder list for the next order. The venture could process orders and prepare them for

delivery at convenient times, even late at night. With a large enough customer base, the

venture could offer a broad selection of products. By dealing directly with dairies,

bakeries, seafood markets, produce markets, and butchers, it could deliver products to

consumers with less handling and could eliminate retail inventories. Perishable grocery

items could be brought to a central distribution facility daily, and delivered to customers

on the same day. Eventually, the venture could begin to use its customer base as a

marketing resource. The Internet site could be used to target advertising to specific

customers, and customer choices could be used to study responses to new products and

advertising efforts.

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