PROBLEM 2

Problem 2:

- The two-span continuous girder shown below is subjected to the following unfactored loads:

PDL = 45 kips (dead)

PLL = 30 kips (live)

- For this problem, there is no live load reduction, but do consider “pattern loading” such that the

member demands are maximized (two primary cases considering: positive moment in a span and

negative moment at the center support).

- Consider self-weight of the member in the design, but self-weight need not be considered when

calculating Cb.

- No deflection check is required.

- Lateral bracing is provided at the load and support points.

- Analysis may be conducted using tabulated solutions (such as Table 3-23 in the AISC Manual) or using

computer tools (such as MASTAN2). If a computer program is used, do not submit many pages of output, but

clearly summarize the key results.

a) Select the lightest W section (A992 steel) for the given loading. (Design tables in AISC Steel Construction

Manual may be used to make your selection, but clearly document your procedures and present calculations

that verify the design strength values from the table.)

b) For the critical loading case(s) that account for pattern loading, plot factored shear force and bending moment

diagram

c) Calculate (do not refer to a table) the design shear strength and show that it is adequate.

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