Seismic response of precast, posttensioned concrete jointed wall systems designed for low- to midrise buildings using the direct displacement-based approach

PCI Journal ◽  
2015 ◽  
Vol 60 (2) ◽  
pp. 38-56 ◽  
Author(s):  
M. Ataur Rahman ◽  
Sri Sritharan
Keyword(s):  
Seismic Response ◽  
Posttensioned Concrete ◽  
Displacement Based

Seismic Assessment and Retrofitting of an Under-Designed RC Frame Through a Displacement-Based Approach

2017 ◽  
pp. 36-58
Author(s):  
Marco Valente ◽  
Gabriele Milani
Keyword(s):  
Seismic Response ◽  
Numerical Models ◽  
Seismic Assessment ◽  
Original Structure ◽  
Rc Frame ◽  
Existing Structures ◽  
Dynamic Analyses ◽  
Non Linear ◽  
Displacement Based ◽  
Southern European Countries

Many existing reinforced concrete buildings were designed in Southern European countries before the introduction of modern seismic codes and thus they are potentially vulnerable to earthquakes. Consequently, simplified methodologies for the seismic assessment and retrofitting of existing structures are required. In this study, a displacement based procedure using non-linear static analyses is applied to a four-storey RC frame in order to obtain an initial estimation of the overall inadequacy of the original structure as well as the extent of different retrofitting interventions. Accurate numerical models are developed to reproduce the seismic response of the RC frame in the original configuration. The effectiveness of three different retrofitting solutions countering structural deficiencies of the RC frame is examined through the displacement based approach. Non-linear dynamic analyses are performed to assess and compare the seismic response of the frame in the original and retrofitted configurations.

An Analytical Mechanical Model for the Seismic Assessment of Bell Towers

2014 ◽  
Vol 624 ◽  
pp. 97-105
Author(s):  
Sergio Lagomarsino ◽  
Daria Ottonelli ◽  
Serena Cattari
Keyword(s):  
Seismic Response ◽  
Mechanical Model ◽  
Main Body ◽  
Seismic Action ◽  
3D Fem ◽  
Fem Model ◽  
Bell Tower ◽  
Preliminary Validation ◽  
Proposed Model ◽  
Displacement Based

The paper describes the analytical model, recently proposed in the Perpetuate Project, aimed to assess the seismic response of the shaft of bell towers, of which the vulnerability to the seismic action has been dramatically testified also by the recent events (as that which hit L’Emilia region in 2012). As main novelties, the model follows the Displacement Based Approach (DBA) for the seismic verification and catches both the shear and combined bending and compression response of the main body of bell towers. In order to clarify the application and to provide a preliminary validation of the proposed model, the seismic response of the bell tower of the San Carlo Church in Castellazzo Bormida (Al, Italy) has been studied. It includes also a detailed analysis on a 3D FEM model aimed to support the calibration of some parameters which the model is founded on in case of quite irregular bell towers characterized by non symmetric boundary conditions that can significantly affect their dynamic behavior, as the case analyzed.

Seismic Strengthening of Non-Ductile R/C Structures Using Infill Wall or Ductile Steel Bracing

2012 ◽  
Vol 602-604 ◽  
pp. 1583-1587 ◽  
Author(s):  
Marco Valente
Keyword(s):  
Seismic Response ◽  
Numerical Models ◽  
Original Structure ◽  
Structural Members ◽  
Infill Wall ◽  
Steel Bracing ◽  
Earthquake Resistant ◽  
Ductile Steel ◽  
Displacement Based ◽  
Nonlinear Dynamic Analyses

This study deals with the seismic assessment and retrofitting of existing non-ductile R/C structures and the issue of selecting effective strengthening solutions is addressed. A displacement based procedure using nonlinear static pushover analyses is adopted in order to assess the main characteristics of the original structure and to select valuable retrofitting strategies. The procedure is applied to a four-storey R/C frame tested at the JRC ELSA Laboratory some years ago. The R/C frame was designed for gravity loads without specific earthquake-resistant provisions. Accurate numerical models are developed to reproduce the seismic response of the R/C frame in both the original and retrofitted configurations. The effectiveness of two strengthening techniques is examined. First, a retrofitting intervention is carried out by adding a concrete shear wall to the short bay of the frame. This solution is efficient in controlling global lateral drift and thus reducing damage in structural members. Then, a retrofitting solution involving the introduction of eccentric steel bracing is investigated in order to reduce the displacement demand and to increase the energy dissipation capacity of the frame. Nonlinear dynamic analyses are performed to assess and compare the seismic response of the frame in the original and retrofitted configurations.

Direct Displacement Based Seismic Design of High Rise Structures with Strengthened Stories (I) - Theory

2011 ◽  
Vol 250-253 ◽  
pp. 2176-2185
Author(s):  
Ke Jia Yang ◽  
Xing Wen Liang ◽  
Lin Zhu Sun
Keyword(s):  
Seismic Response ◽  
Seismic Design ◽  
Design Procedure ◽  
Single Degree Of Freedom ◽  
Mode Theory ◽  
High Rise ◽  
Single Degree ◽  
Actual Design ◽  
Displacement Based ◽  
Displacement Based Seismic Design

High rise structures with strengthened stories are widely used nowadays. A rational seismic design procedure for this kind of structure is thus necessary. Based on mode theory and direct displacement based seismic design of multi-story buildings, this paper proposed a new direct displacement based seismic design procedure. In the proposed method, each mode of the high rise structure is equivalent to a single degree of freedom (SDOF) system. Seismic response of each mode is calculated and adds up to consider the contributions of higher modes. Considering the characteristic of strengthened stories, two stories above the strengthened stories are taken as the “key stories”, whose performance indicates the performance of the building. The proposed procedure is logical, simple and can serve for reference of actual design.

Influence of the distribution of the shear walls on the seismic response of the buildings

2020 ◽  
Vol 15 (1) ◽  
pp. 37-44
Author(s):  
El Mehdi Echebba ◽  
Hasnae Boubel ◽  
Oumnia Elmrabet ◽  
Mohamed Rougui
Keyword(s):  
Structural Analysis ◽  
Seismic Response ◽  
Natural Frequency ◽  
Structural Design ◽  
Structural Response ◽  
Shear Walls ◽  
Structural Elements ◽  
Analysis Software ◽  
Ansys Apdl ◽  
The Impact

Abstract In this paper, an evaluation was tried for the impact of structural design on structural response. Several situations are foreseen as the possibilities of changing the distribution of the structural elements (sails, columns, etc.), the width of the structure and the number of floors indicates the adapted type of bracing for a given structure by referring only to its Geometric dimensions. This was done by studying the effect of the technical design of the building on the natural frequency of the structure with the study of the influence of the distribution of the structural elements on the seismic response of the building, taking into account of the requirements of the Moroccan earthquake regulations 2000/2011 and using the ANSYS APDL and Robot Structural Analysis software.

Influence of Ground Properties on Seismic Response of Tower Cranes Supported by Pile Foundations

2008 ◽  
Vol 1 (1) ◽  
pp. 37-46
Author(s):  
Satoshi TAMATE ◽  
Yasuo TOYOSAWA ◽  
Seiji TAKANASHI ◽  
Kazuya ITOH ◽  
Naoaki SUEMASA ◽  
...  
Keyword(s):  
Seismic Response ◽  
Pile Foundations
Sign in / Sign up

Export Citation Format

Share Document