Seismic Design Considerations for Long Span Metal Buildings

Abstract eng:
The assessment of seismic design of long span Metal buildings is controlled by several factors and considerations. The basic considerations for seismic design are related with the ductility capacity of the structure, allowable inter-story drift, responsemodification coefficient R, second order effects, lateral torsional buckling for members, foundation stiffness assumptions for support the structure to include soil-structure-interaction, and some other complementary aspects. The seismic design criteria for long span Metal buildings are usually out of the scopes of the building design codes. The seismic design of long span metal buildings requires a set of specific considerations in order to fulfill the basic requirements of most building codes: guarantee the safety of the occupants and the contents and minimize structural and non-structural damages in order to guarantee as much as possible the continuity in the functionality after the design level earthquake. This paper presents a case study of the structural design for a long span metal building, with steel moment resisting frame in the transverse direction, and steel ordinary concentric braced frame in the long-direction. The structure is located in an intermediate seismic zone. The typical spans are 30 m and 14 m in the transverse and long direction respectively. The total height of the structure is 20 m. The steel moment resisting frame is composed of built-up sections conforming beams and columns. The foundation system is a deep foundation formed by a group of piles, a rigid pile-cap and a base column which allows an adequate connection to the column. The seismic design considerations are based on several Standards codes and books reference as ASCE/SEI 7-10, ASCE/SEI 41-13, Metal Building Manual, AISC 360-10, AISC 341-10 and NSR-10. The case study presents a summary of the most relevant impacts in the structural design methods on the final expected behavior of the structure, for each one of the considerations related to the seismic design. Finally, an approach for the assessment of the main seismic design considerations for long span metal buildings is presented as a guideline for structural design analysis of these complex structures.

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