Extension of direct displacement‐based design for quantifying higher mode effects on controlled rocking steel cores. (12th August 2020)

• Record Type: Journal Article
• Authors: Rahgozar, Navid; Rahgozar, Nima
• Is Part Of: Structural design of tall and special buildings. Volume 29:Number 16(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-08-12
• Subjects: controlled rocking core -- direct displacement‐based design -- higher mode effects; Tall buildings -- Design and construction -- Periodicals; Structural design -- Periodicals; 690.1
• DOI: 10.1002/tal.1800
• Languages: English
• ISSNs: 1541-7794

Abstract

Summary: Direct displacement‐based design (DDBD) procedure utilizes an equivalent single‐degree‐of‐freedom model to predict seismic demands while neglecting the higher mode effects. Controlled rocking steel cores (CRSCs) vibrate in the first mode of vibration; however, higher modes greatly influence the member forces. Previous studies, in which DDBD has been utilized, have not quantified the contribution of higher mode demands to CRSC's assemblies. This paper aims to extend the DDBD (EDDBD) procedure for low‐damage buildings, equipped with CRSCs. Modal responses are combined with modified SRSS at the design displacement. Design is formulated for the strength and stiffness of the CRSC components. The application of the proposed design approach is illustrated by 3‐, 9‐, and 15‐story archetypes. Results verified by nonlinear dynamic analyses demonstrate the high precision of EDDBD in the design of low‐ to mid‐rise CRSCs. The proposed procedure is applicable to commercial software.