Ductility reduction factor formulations for seismic design of RC wall and frame structures

2019 ◽  
Vol 178 ◽  
pp. 102-115 ◽  
Author(s):  
Matteo Zerbin ◽  
Alessandra Aprile ◽  
Katrin Beyer ◽  
Enrico Spacone
Keyword(s):  
Seismic Design ◽  
Reduction Factor ◽  
Frame Structures ◽  
Ductility Reduction Factor

Direct Damage-Based Seismic Design Method of RC Frame Structures

2014 ◽  
Vol 539 ◽  
pp. 695-699
Author(s):  
Lan Fang Luo ◽  
Jing Xu
Keyword(s):  
Seismic Design ◽  
Design Method ◽  
Reduction Factor ◽  
Frame Structures ◽  
Rc Frame ◽  
Strength Reduction Factor ◽  
Direct Damage ◽  
Innovative Methodology ◽  
Rc Frame Structures ◽  
Seismic Design Method

Based on the existing research, this paper presents an innovative methodology to realize direct damage-based seismic design for RC frame structures by mobilizing ESDOF theory and the damage-based strength reduction factor (RDfactor). A design example is then followed to verify this method.

scholarly journals Seismic design and analysis of reinforced concrete buckling-restrained braced frame buildings with multi-performance criteria

2019 ◽  
Vol 15 (10) ◽  
pp. 155014771988135
Author(s):  
Yanchao Yue ◽  
Tangbing Chen ◽  
Yongtao Bai ◽  
Xiaoming Lu ◽  
Yan Wang ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Seismic Design ◽  
Design Method ◽  
Performance Criteria ◽  
Main Beam ◽  
Frame Structures ◽  
Concrete Frame ◽  
Buckling Restrained Brace ◽  
Buckling Restrained Braces ◽  
Line Design

Buckling-restrained braces play a critical role as the first-defendant line in dissipating seismic energy and are often used in concrete frame structures to ensure that the main beam–column members are “undamaged” or significantly elastic during medium earthquakes. The design of the reinforced concrete frame structures with buckling-restrained brace is generally based on the assumption of shear deformation of the structure. The conventional seismic design considers the “second-defendant line design” based on the geometric relationship between the axial deformation and strength of buckling-restrained braces and stratified deformation. This article proposes iterative optimization of the buckling-restrained brace design method and layout scheme based on the nonlinear structural response of the calibrated numerical model, and then approximates the nonlinear structure scheme using a linear method. Time history analyses are performed to prove that the linear design method is highly conservative for estimating seismic intensity, and the proposed design method provides more efficient damage distributions in frame components. The results of the nonlinear performance evaluation and energy analysis indicate that the method proposed in this article can meet the performance design requirements achieving multi-performance criteria.

SEISMIC DESIGN OF FRAME STRUCTURES EQUIPPED WITH INNOVATIVE HYSTERETIC DISSIPATIVE DEVICES

2019 ◽  
Vol 6 (1) ◽  
Author(s):  
Michele Palermo ◽  
Vittoria Laghi ◽  
Stefano Silvestri ◽  
Giada Gasparini ◽  
Tomaso Trombetti
Keyword(s):  
Seismic Design ◽  
Design Procedure ◽  
Structural Instability ◽  
Hysteretic Behavior ◽  
Frame Structure ◽  
Frame Structures ◽  
Order Effects ◽  
Final Design ◽  
Structural Engineer ◽  
Performance Based Seismic Design

In the present work, a Performance-Based Seismic Design procedure applied to multi-storey frame structures with innovative hysteretic diagonal steel devices (called Crescent Shaped Braces or CSB) is introduced. CSBs are steel elements of peculiar geometrical shapes that can be adopted in frame buildings as enhanced hysteretic diagonal braces. Based on their "boomerang" configuration and placement inside the frame structure, they are characterized by a lateral stiffness uncoupled from the yield strength and, if properly inserted, by an overall symmetric hysteretic behavior with hardening response at large drifts, thus preventing from global structural instability due to second-order effects. The procedure here presented is intended to guide the structural engineer through all the steps of the design process, from the selection of the performance objectives to the preliminary sizing of the CSB devices, up to the final design configuration. The steps are described in detail through the development of an applicative example.

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