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.

The Impact of Infilled Wall on Seismic Performance of Frame Structure

2013 ◽  
Vol 353-356 ◽  
pp. 2127-2130
Author(s):  
Xi Ping Liu
Keyword(s):  
Seismic Performance ◽  
Seismic Design ◽  
Quantitative Description ◽  
Frame Structure ◽  
Frame Structures ◽  
Current Phase ◽  
Seismic Design Code ◽  
Performance Based Seismic Design ◽  
The One ◽  
The Impact

In accordance with damages of infilled wall frame structures in Wenchuan earthquake, the current 2010 version of "Seismic Design Code of Building" is attached herewith increasing significance to infilled wall, which switches "consider the impact of infilled wall on seismic performance of frame structure and avoid main structure destruction caused by setting infilled wall unreasonably " from a general provision into a mandatory provision, however, a specific quantitative description on the impact of infilled wall on seismic performance of frame structure is still absent. The impact of infilled wall on seismic performance of frame structure is analyzed in the paper, and two suggestions pertain to design and research of infilled wall is proposed under current phase: on the one hand, "conceptual design" should be kept on highlighting in the seismic design of infilled wall frame structures; on the other hand, based on the concept of "performance-based seismic design", the idea that infilled wall should be treated distinctively is put forward.

Inter-Story Capacity Spectrum for the Performance Based Seismic Design of Vertically Irregular RC Frame Structures I: Method

2012 ◽  
Vol 517 ◽  
pp. 745-748
Author(s):  
Jin Jie Men ◽  
Qing Xuan Shi ◽  
Qi Zhou
Keyword(s):  
Seismic Design ◽  
Demand Curve ◽  
Frame Structure ◽  
Frame Structures ◽  
Dynamical Characteristic ◽  
Displacement Curve ◽  
Inelastic Behavior ◽  
Capacity Spectrum ◽  
Demand Curves ◽  
Performance Based Seismic Design

Considering the dynamical characteristic of structure under different earthquake hazard level, inelastic demand curves, namely, inter-story shear versus inter-story displacement curve are established by using mode spectrum method. Based on the relation of structure performance object and displacement ductibility, the relation of structure performance object and inter-story demand curve is established. And the inter-story demand curves take into account the inelastic behavior of structure under earthquake action adequately. Then considering the seismic respond characteristic and the capacity curve of the frame structure a new method named inter-story capacity spectrum (ISCS) is put forward for the performance based seismic design of vertically irregular frame structures. Examples are presented to demonstrate the applicability and utility of the proposed method. In part , the procedure to establish the ISCS method is mainly explained. And the examples will be introduced in part .

Direct Displacement Procedure for Performance-Based Seismic Design of Mid-Rise Wood-Framed Structures

2009 ◽  
Vol 25 (3) ◽  
pp. 583-605 ◽  
Author(s):  
Wei Chiang Pang ◽  
David V. Rosowsky
Keyword(s):  
Seismic Design ◽  
Response Spectrum ◽  
Design Procedure ◽  
Time History ◽  
Time History Analysis ◽  
Nonlinear Time History Analysis ◽  
Framed Structures ◽  
History Analysis ◽  
Performance Based Seismic Design ◽  
Nonlinear Time History

This paper presents a direct displacement design (DDD) procedure that can be used for seismic design of multistory wood-framed structures. The proposed procedure is applicable to any pure shear deforming system. The design procedure is a promising design tool for performance-based seismic design since it allows consideration of multiple performance objectives (e.g., damage limitation, safety requirements) without requiring the engineer to perform a complex finite element or nonlinear time-history analysis of the complete structure. A simple procedure based on normalized modal analysis is used to convert the code-specified acceleration response spectrum into a set of interstory drift spectra. These spectra can be used to determine the minimum stiffness required for each floor based on the drift limit requirements. Specific shear walls can then be directly selected from a database of backbone curves. The procedure is illustrated on the design of two three-story ATC-63 archetype buildings, and the results are validated using nonlinear time-history analysis.

Performance-Based Seismic Design Approach for High Speed Railway Bridge

2011 ◽  
Vol 383-390 ◽  
pp. 6601-6607
Author(s):  
Xing Chong Chen ◽  
Xiu Shen Xia ◽  
Li Li Xing
Keyword(s):  
Seismic Design ◽  
High Speed ◽  
Design Procedure ◽  
Reduction Factor ◽  
Railway Bridge ◽  
Strength Reduction Factor ◽  
Maximum Displacement ◽  
High Speed Railway ◽  
Displacement Ductility ◽  
Performance Based Seismic Design

Performance objectives and contents of resistance verification for high speed railway bridge are embodied and quantified based on the theory of performance-based seismic design. The resistance verification is proposed, which can control the damage under design earthquake and ensure safety of the pier under low-level earthquake. The simplified capacity spectra method for calculating displacement ductility factor is proposed by using strength reduction factor. The method for evaluating damage of RC bridge pier in high-level earthquake is presented by using maximum displacement and hysteretic energy. The proposed approach and procedures for performance-based seismic design are easily to implement. The performance-based seismic design procedure is demonstrated by using an example.

scholarly journals Performance-based seismic design of multistory frame structures equipped with crescent-shaped brace

2017 ◽  
Vol 25 (2) ◽  
pp. e2079 ◽  
Author(s):  
Omar Kammouh ◽  
Stefano Silvestri ◽  
Michele Palermo ◽  
Gian Paolo Cimellaro
Keyword(s):  
Seismic Design ◽  
Frame Structures ◽  
Performance Based Seismic Design ◽  
Multistory Frame

scholarly journals Analysis of second-order effects of constructions behaviour

2019 ◽  
Author(s):  
Raminta Venslavavičiūtė ◽  
Kęstutis Urbonas
Keyword(s):  
Steel Frame ◽  
Second Order ◽  
Frame Structure ◽  
Frame Structures ◽  
Order Effects ◽  
Rotational Stiffness ◽  
Frame Building ◽  
Steel Frame Structures ◽  
Second Order Effects ◽  
Rigid Joints

This paper presents the importance of the second-order effects in behaviour of steel frame structures. EN 1993-1-1 were distinguished three main methods: taking / without taking into account second order effects depending on the sensitivity of horizontal design effects and tolerance. Using these methods, the susceptibility of steel frame structures to second-order impacts is considered in accordance with EN 1993-1-1. The study was performed taking into account also the rotational stiffness of the joints of the frame structure. In this way, trying to determine the effect of the joint on the rotational rigidity makes the frame structure more sensitive to second order impacts. It is also considered a semi-rigid joints effects the general frame-tailed P-Δ and the second row stress. This establishes the link between the effects of the second-order and the semi-rigid joints in the overall (general) analysis. Frame-building sensitivity makes it possible to compare and measure the importance of such dependencies.

scholarly journals Improvement of the Performance-Based Seismic Design Method of Cable Supported Bridges with the Resilient-Friction Base Isolation Systems

2020 ◽  
Vol 10 (11) ◽  
pp. 3942 ◽  
Author(s):  
Heungbae Gil ◽  
Kyoungbong Han ◽  
Junho Gong ◽  
Dooyong Cho
Keyword(s):  
Seismic Design ◽  
Design Method ◽  
Response Spectrum ◽  
Design Procedure ◽  
Time History ◽  
Modal Shape ◽  
Ground Acceleration ◽  
Performance Based Seismic Design ◽  
Seismic Design Method ◽  
Shape Analyses

In areas of civil engineering, the resilient friction base isolator (R-FBI) system has been used due to its enhanced isolation performance under seismic excitations. However, because nonlinear behavior of the R-FBI should be reflected in seismic design, effective stiffness (Keff) of the R-FBI is uniformly applied at both peak ground acceleration (PGA) of 0.08 g and 0.154 g which use a multimodal response spectrum (RS) method analysis. For rational seismic design of bridges, it should be required to evaluate the dynamics of the R-FBI from in-field tests and to improve the seismic design procedure based on the performance level of the bridges. The objective of this study is to evaluate the dynamics of the R-FBI and to suggest the performance-based seismic design method for cable-supported bridges with the R-FBI. From the comparison between the experiments’ results and modal shape analyses, the modal shape analyses using primary (Ku) or infinite stiffness (fixed end) showed a great agreement with the experimental results compared to the application of Keff in the shape analysis. Additionally, the RS or nonlinear time history method analyses by the PGA levels should be applied by reflecting the dynamic characteristics of the R-FBI for the reasonable and efficient seismic design.

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