Modeling, analysis and seismic design of structures using energy dissipators SLB

This paper initially describes aspects of the modeling of structures equipped with energy dissipators Shear Link Bozzo (SLB) and develops two iterative design procedures to select these devices. This methodology is applied to a precast 5-story reinforced concrete building. The SLB energy dissipation devices are initially stiff, but ductile with a range of yielding forces from 36 kN to 900 kN characterized by 52 + 52 standard devices. Moreover, these devices can be combined in parallel giving a very wide range of possibilities for selection and corresponding structural response. Therefore, to simplify its automatic selection, this article presents two procedures: (1) direct iteration and (2) inverse or fixed force iteration. Both procedures were implemented in an automatic application or “plugin” for the ETABS program that automates its selection for a specific structural system or architectural configuration of these elements. Using these devices, the energy introduced by an earthquake into the structure can be dissipated, protecting other structural elements that suffer damage. The SLB energy dissipation devices are affordable to get a significant performance improvement in the overall structural response. This work presents a five-story precast reinforced concrete building frame, called SLB Building, that provides 4 departments per level all with a diaphanous interior floor. The building is made up of 11 columns with a constant 40x40cm section and all its beams have hinges at the ends. This building was equipped with 120 small SLB devices showing its performance for the maximum earthquake of Peruvian seismic code without ductility reduction (R = 1) by means of nonlinear time history with ten seismic records compatible with the S1 soil spectrum. In this structure, all seismic energy dissipation was concentrated in these devices so there would be no structural damage. In addition, the levels of non-structural damage were controlled with initial stiffness of these devices since lateral displacements were reduced to levels below the Peruvian seismic code (or even immediate occupancy for devices greater than those provided in this example). At the same time, the levels of acceleration decrease in height to only 0.3g and the base shear coefficient is reduced from almost 1.2 to only 0.12-0.2 (this means an R factor between 6 and 10 without structural damage).

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Structural Health Monitoring of a Reinforced Concrete Building during the Severe Typhoon Vicente in 2012

The Scientific World JOURNAL ◽

10.1155/2013/509350 ◽

2013 ◽

Vol 2013 ◽

pp. 1-12 ◽

Cited By ~ 11

Author(s):

Sin-Chi Kuok ◽

Ka-Veng Yuen

Keyword(s):

Reinforced Concrete ◽

North Pacific Ocean ◽

Structural Response ◽

Tropical Storm ◽

Modal Identification ◽

Structural Performance ◽

Reinforced Concrete Building ◽

Concrete Building ◽

Time Histories ◽

Wind Characteristics

The goal of this study is to investigate the structural performance of reinforced concrete building under the influence of severe typhoon. For this purpose, full-scale monitoring of a 22-story reinforced concrete building was conducted during the entire passage process of a severe typhoon “Vicente.” Vicente was the eighth tropical storm developed in the Western North Pacific Ocean and the South China Sea in 2012. Moreover, it was the strongest and most devastating typhoon that struck Macao since 1999. The overall duration of the typhoon affected period that lasted more than 70 hours and the typhoon eye region covered Macao for around one hour. The wind and structural response measurements were acquired throughout the entire typhoon affected period. The wind characteristics were analyzed using the measured wind data including the wind speed and wind direction time histories. Besides, the structural response measurements of the monitored building were utilized for modal identification using the Bayesian spectral density approach. Detailed analysis of the field data and the typhoon generated effects on the structural performance are discussed.

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F.E.M. Simulation of the Building Frame Node Behavior during Seism

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.823.95 ◽

2016 ◽

Vol 823 ◽

pp. 95-98

Author(s):

Adriana Ionescu ◽

Cristian Burada ◽

Mihai Negru

Keyword(s):

Reinforced Concrete ◽

Energy Dissipation ◽

Strain State ◽

Stress And Strain ◽

Building Frame ◽

Reinforced Concrete Building ◽

Concrete Building ◽

Important Nodes

This paper presents a simulation made with ANSYS program on the stress and strain state of the node region of a reinforced concrete building subjected to earthquakes and equipped with devices for seism energy dissipation. This simulation includes the forces developed by the damping devices which act on these important nodes regions. The main goal of this simulation is to determine if the presence of the damping device at the supra-structure of the building is increasing the stresses and strains in the concrete and reinforcement bars of the node during earthquakes. For this study were used damping devices with damping forces depending on displacements. The results are very useful in the process of designing the damping system for the superstructure of the building and in the process of designing the reinforcements of the building nodes regions.

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Evaluation of Medium-Rise Reinforced Concrete Building Performance under Low Intensity Earthquake Effect

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.661.106 ◽

2014 ◽

Vol 661 ◽

pp. 106-110 ◽

Cited By ~ 2

Author(s):

Rozaina Ismail ◽

Hamidah Mohd Saman ◽

Masitah Hassim

Keyword(s):

Reinforced Concrete ◽

Structural Damage ◽

Damage Index ◽

Design Procedure ◽

Time History ◽

Building Design ◽

Reinforced Concrete Building ◽

Damage Level ◽

Low Intensity ◽

Concrete Building

The paper presents an evaluation of medium-rise reinforced concrete building in Johor which is subjected to low intensity earthquake effects. Even-though Malaysia is outside the earthquake region, the country had experienced and did suffer from major cases due earthquake in the past like tsunami. Engineers should concern and consider the loading for reinforced concrete building due to earthquake in the building design procedure. The study addresses the performance of critical frame reinforced concrete building when subjected to earthquake motion. The building of Marlborough College Malaysia chooses as model. The building was analyzed using Finite Element Modelling (FEM) using IDARC (2D) with respect to various earthquake intensities obtained from Time History Analysis (THA) data. The yield point at the beam-column connections was analyzed to determine the damage index and damage level of the building subjected to the various earthquake intensities. The building performed the early yielding point at 4.2650 sec for beam element at the intensity of 0.15g. Based on the results, it was found that the critical frame of Condominium Marlborough College Malaysia can stand an earthquake occurrence with intensity up to 0.20g. There is no structural damage some non-structural damage is expected in the non-linear analysis of modal frames. The building was also categorized as the one in the light damage level.

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