Each of the bracing members is considered active in

  • No School
  • AA 1
  • 374

This preview shows page 25 - 27 out of 374 pages.

Each of the bracing members is considered active in the analysis of the system when lateral loads are applied. As a result, the bracing elements are subjected to both tension and compressive forces. Beams and girders used in the Chevron-braced frame are designed as two span continuous mem- bers. This will almost always result in shallower and lighter members when compared to a simple span member of equal column-to-column length. Eccentrically Braced Frames Eccentrically braced frames are very similar to frames with Chevron bracing. In both systems the general configuration is an inverted V shape with a connection between the brace and the column and a connection at the beam/girder at the next level up. However, unlike the Chevron-braced frame which has the brace member workpoints intersect- ing at the same point on the beam/girder for the brace elements. The condition is shown in Figure 10. This type of bracing is commonly used in seismic regions requiring a significant amount of ductility or energy absorption characteristics within the struc- ture. The beam/girder element between the work- points of the bracing member shown is designed to link elements and assists the system in resisting lat- eral loads caused by seismic activity. Column Beam or Girder Gusset Cross Bracing Beam to Column Connection Gusset to Column Connection Figure 7. Typical beam to column brace connections
Image of page 25
SYSTEMS PAGE 14 Rigid Frames Rigid frames are used when the architectural design will not allow a braced frame to be used. This type of lat- eral resisting system generally does not have the initial cost savings as a braced frame system but may be bet- ter suited for specific types of buildings. Figures 11 and 12 show a floor plan and building line elevation of a rigid frame system. Figure 11 indicates the solid triangle designation typically used to show rigid connections between beam and column as well as girder and column. The building elevation shown in Figure 12 indicates the same solid triangular symbols at the floor line beam to column joints. Connections between the beam/girder and column typically consist of a shear connection for the gravity loads on the member in combination with a field weld- ed flange to column flange connection. Column stiff- ener plates may be required based on the forces trans- ferred and column size. This type of joint is illustrated in Figure 13. It must be noted that this type of joint requires all vertical utility ductwork and piping to be free and clear of the column and beam/girder flanges. Coping of the beam/girder flanges to allow passage of piping or other utilities is usually not acceptable and must be brought to the attention of the structural engi- neer as soon as possible. Figure 8. Typical floor plan with Chevron bracing Figure 9. Elevation with Chevron bracing Eccentric Brace Gusset Figure 10. Eccentric brace with typical brace to beam connection Chevron bracing See Elevation in Figure 9.
Image of page 26
Image of page 27

You've reached the end of your free preview.

Want to read all 374 pages?

  • Fall '19
  • Structural steel

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern

Stuck? We have tutors online 24/7 who can help you get unstuck.
A+ icon
Ask Expert Tutors You can ask You can ask You can ask (will expire )
Answers in as fast as 15 minutes
A+ icon
Ask Expert Tutors