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** Steel frame and purlin (a kind of beam) ***
บทที่ 4
This is the cover way near 7-11 in the student’s dormitory area. It has a number of statically determinate steel frames, connected by the steel purlins. Each frame is supported by a RC foundation with bolted connection, forming a fixed support (assumed). The rigid connection is used to connect the beam and the column of the frames.

The purlins are used to support the steel roofing sheets. The loads, both deal load and life load, are transferring from the roofing sheets to the purlins in the form of uniformly distributed loads. The reactions from the purlins transfer to the frame at the connecting points.

In chapter 4, you will need to answers to the following questions:
1: How do you determine the reactions at the support of a purlin and a frame?
2. How do you determine the internal forces (normal force and shear force) and bending moment at a given section of the purlin and the frame.
3. How do you draw the normal force diagram, the share force diagram and the bending moment diagram of the purlin and the frame?
4. What is the maximum normal force, the maximum shear force and the maximum bending moment occurred in the purlin and the frame?
5. How do you design the purlin and the frame members?
6. Are the obtained steel sections of the purlin and the frame are strong enough to take the maximum shear forces?
7. What is the maximum deflections of the purlin and the frame? Are they acceptable compared to the allowable deflection?