scholarly journals From Performance- and Displacement-Based Assessment of Existing Buildings per EN1998-3 to Design of New Concrete Structures in fib MC2010

2014 ◽  
pp. 227-266 ◽  
Author(s):  
Michael N. Fardis
Keyword(s):  
Concrete Structures ◽  
Existing Buildings ◽  
Displacement Based

Seismic Rehabilitation of Existing Reinforced Concrete Buildings with Seismic Isolation: A Case Study

2014 ◽  
Vol 30 (4) ◽  
pp. 1619-1642 ◽  
Author(s):  
Donatello Cardone ◽  
Giuseppe Gesualdi
Keyword(s):  
Seismic Isolation ◽  
Residential Building ◽  
Existing Buildings ◽  
Isolation System ◽  
Rehabilitation Process ◽  
Seismic Rehabilitation ◽  
High Rise ◽  
System Type ◽  
Displacement Based

The use of seismic isolation for the seismic rehabilitation of existing buildings is very attractive but often very tricky due to several aspects related to its implementation. In this paper, a case study of seismic rehabilitation of a high-rise residential building with seismic isolation is presented. The building under consideration is located in southern Italy and it is placed next to another building from which it is separated by a gap of 400 mm. In the paper, all the steps of the seismic rehabilitation process are described. First, the target objective of the seismic rehabilitation and the choice of isolation system type and location are discussed. The design of the isolation system, carried out following a direct displacement-based approach, is then examined. Finally, the main phases followed in the installation of the isolation system are described. Some comments on costs and time needed to complete the intervention are also reported.

scholarly journals The High-Performance Dissipating Frame (HPDF) System for the Seismic Strengthening of RC Existing Buildings

2021 ◽  
Vol 13 (4) ◽  
pp. 1864
Author(s):  
Vincenzo Manfredi ◽  
Giuseppe Santarsiero ◽  
Angelo Masi ◽  
Giuseppe Ventura
Keyword(s):  
High Performance ◽  
Design Procedure ◽  
Seismic Retrofitting ◽  
Existing Buildings ◽  
Sustainable Solutions ◽  
Seismic Rehabilitation ◽  
Existing Structures ◽  
Rc Frames ◽  
Frame System ◽  
Displacement Based

In Italy as well as in other earthquake-prone countries, the large number of existing buildings requiring seismic retrofitting calls for sustainable solutions able to reduce both costs and downtime. To this purpose, in this paper, the High-Performance Dissipating Frame system (HPDF), a new strengthening solution for the seismic rehabilitation of existing buildings, is presented. HPDF is based on external precast reinforced concrete (RC) frames rigidly connected to the existing structures and equipped with shear damper devices in order to provide high dissipation capacity. The proposed solution permits: (i) to increase sustainability through works made up from the outside without removing/demolishing infills/other non-structural components, (ii) rapid execution by adopting precast resisting members mutually restrained with steel connections, and (iii) effectiveness due to shear damper devices able to dissipate a large amount of shaking energy. In the paper, a displacement-based design procedure is proposed and applied to a numerical example.

Comparison between NZS 1170.5 seismic design spectra and hysteresis-damped spectra

2017 ◽  
Vol 50 (1) ◽  
pp. 59-70
Author(s):  
Caudillo Aguas
Keyword(s):  
New Zealand ◽  
Seismic Design ◽  
Earthquake Engineering ◽  
Existing Buildings ◽  
Equivalent Viscous Damping ◽  
Design Spectrum ◽  
Design Spectra ◽  
Low Levels ◽  
Displacement Based ◽  
Seismic Design Of Structures

This study aims to provide a comparison and identify the key distinctions between the New Zealand Standard – Earthquake Actions (NZS 1170.5: 2004) seismic design spectra and the hysteresis-damped seismic demand spectra specified by either the New Zealand Society for Earthquake Engineering (NZSEE) “Assessment and Improvement of the Structural Performance of Buildings in Earthquakes” (AISPBE) Guidelines, or the “Displacement-Based Seismic Design of Structures” (DBSDS) textbook by Priestley et al. (2007). The damping provided by the draft document, “The Seismic Assessment of Existing Buildings” (TSAEB), was also briefly discussed. The seismic design spectrum was calculated for various levels of ductility using all three methods and compared against each other. This was performed for structural elastic periods from 0.1 to 4.5 seconds. For a given set of requirements based on the NZS 1170.5 parameters, a representative acceleration-displacement hysteresis loop has been generated. The equivalent viscous damping was then calculated based on the area under this hysteresis using the recommendations of either the AISPBE or through the damping equations based on the DBSDS. The final damped spectra were then compared with each other and against the NZS 1170.5 design spectrum. Results indicate good correlation between the NZS 1170.5 design spectra and the damped design spectra at low levels of ductility but show significant disparities at higher levels of ductility.

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