Displacement-Based Preliminary Seismic Design of Diagrid Systems


Abstract eng:
In recent years, the diagrid (diagonal grid) system has offered an attractive option to carry the gravity and wind loads acting on tall buildings located in non-seismic zones. In spite of the possible advantages that this type of structural system can offer for tall buildings located in high seismicity zones, very few studies have been devoted to make possible this application. This paper describes a performance-based seismic design methodology for diagrid systems that contemplates two steps: A) Global Predesign and B) Local Predesign. The first step establishes, as a function of the required structural performance, a lateral roof displacement threshold. Then, the use of this threshold and of a design displacement spectrum allows for the estimation of the lateral stiffness required by the diagrid system in terms of a target value for its fundamental period of vibration. During the second step, the diagonals of the diagrid system are sized in such a manner as to satisfy its lateral stiffness requirements; that is, the area of the diagonals is estimated so that the building exhibits a fundamental period of vibration that matches its target value. The use of the methodology is illustrated during the predesign of a 24-story building having a circular plan and located in the Lake Zone of Mexico City. Then, the global mechanical characteristics of the building are determined through a nonlinear static analysis, and its structural performance evaluated through a series of nonlinear dynamic analysis.

Contributors:
Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
Rights:
Text je chráněný podle autorského zákona č. 121/2000 Sb.



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 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 574.:
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