Page 285 - Advanced Design Examples of Seismic Retrofit of Structures

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Chapter 5

Example of a Steel Frame

Building Retrofitted with

Concentric Braces ☆

†
Abdoreza S. Moghadam*, Behnam Azmoudeh , Morteza Raissi
‡
Dehkordi and Mahdi Eghbali §
* †
International Institute of Earthquake Engineering and Seismology (IIEES), Tehran, Iran, APS
‡
Designing Energy, Rome, Italy, Iran University of Science and Technology, Tehran, Iran,
§
Department of Civil Engineering, Faculty of Engineering, University of Zanjan, Zanjan, Iran
Aims
By reading this chapter, you are introduced to:
l the evaluation procedure for steel frame buildings with braces;
l the evaluation procedure for cradle-type connections;
l the evaluation procedure for foundations; and
l comparison of three different brace systems as the retrofitting methods with regards
to performance improvement, construction costs, and construction time.

5.1 INTRODUCTION
In this chapter, a typical two-story steel simple frame is evaluated making use of
ASCE 41 [1], Iranian Code of Practice for Seismic Resistant Design of Build-
ings (Standard 2800) [2], and Instruction for Seismic Rehabilitation of Existing
Buildings (Code 360) [1]. The building is located in Kermanshah, Iran, which
has high seismicity (design acceleration of 0.3g). The building has a total area
2
of 1095m across the floor and first stories, and was constructed in 1996. On the
floor, the building has cradle-type (2INP240) beam-column connections (see
Fig. 4.13, Chapter 4) in the North-South direction and simple connection
(2IPE140) in the West-East direction. The connection of the first story in both
directions is similar to the latter one. In addition to the main building, there is a

☆ This chapter is mainly a part of a retrofit project ordered by Organization for Development, Ren-
ovation and Equipping Schools of IR. Iran (DRES). The authors of this chapter appreciate the finan-
cial and technical support of DRES.

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