Estimation of period of vibration for concrete moment-resisting frame buildings

Salama, Magdy I.

doi:10.1016/j.hbrcj.2014.01.006

Cited by 16 publications

(12 citation statements)

References 1 publication

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“…The database includes observed period values for 40 RC buildings in transverse and longitudinal directions, measured during the 1971 San Fernando and subsequent earthquakes. Some strong motion records obtained during the Loma Prieta and Northridge earthquakes [44] and [45].…”

Section: 12 40 Buildings In California -Geomorphological Zone IImentioning

confidence: 99%

Soil foundation and structure interaction effects on the estimating of fundamental period of instrumented buildings

Torkia¹,

Maalem²,

Noureddine³

2020

Preprint

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The aim of this paper is to propose new expressions for fundamental period of reinforced concrete buildings which takes into account of soil foundation and structure interaction SFSI effects and its variation of 215 existing buildings located in the USA, Europe and Asia. Diagrams representing empirical relationship between fundamental period-height in most recent research and building codes. No difference was observed in the value of period T as a result of degradation of the soil bearing capacity in this ranges. It is incorrect to present a single equation or a single diagram for different geotechnical conditions. To evaluate SFSI effects, simplified SFSI modal described in this work using on Van nuys building-VN7SH and are compared with those obtained by different authors. In order to developed a simplifieds equations for estimating fundamental periods of vibration for 03 geomorphological sites, 40 existing buildings recorded over a period of 24 years located in the sites of California are utilized, that encompass a wide range of structural and geotechnical conditions. On the other hand,175 more buildings used from Europe and Asia exposed to earthquake actions were examined to evaluate the accuracy of the relationship.A collective examination of the empirical, measured and procedures show that the fundamental period is fonction of to the building overall height H estimated on empirical formulas provided by earthquake design codes used for buildings under SFSI conditions effects under certain circumstances, underestimate the real response of the structures. The results reveal the effects of SFSI due to an earthquake recorded motion on the response of buildings depends mainly on the soil mass amplification, as well as secondary influences from type, shape and inertia of foundation.

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Section: 12 40 Buildings In California -Geomorphological Zone IImentioning

confidence: 99%

Soil foundation and structure interaction effects on the estimating of fundamental period of instrumented buildings

Torkia¹,

Maalem²,

Noureddine³

2020

Preprint

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“…The codes permit calculation of the period by a rational analysis [10], such as Rayleigh's method, but specify that the resulting value should not be longer than that estimated from the empirical formula by a certain factor to safeguard against unreasonable assumptions in the rotational analysis.…”

Section: Code Formulasmentioning

confidence: 99%

“…Salama [10] studies the effect of the floor height in the period of vibration for concrete moment resisting frame buildings.…”

Section: Introductionmentioning

confidence: 99%

Estimation of period of vibration for concrete shear wall buildings

El-saad

Salama

2017

HBRC Journal

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Most seismic design codes generally provide formulas to be used for the estimation of the base shear and lateral loads. For the determination of the lateral loads, it is required to estimate first the fundamental vibration period of the building theoretically or experimentally (Uniform Building Code (UBC-1997); Structural Engineers Association of California (SEAOC-1996); Egyptian Code for Computation of Loads and Forces in Structural and Building Work (EGC-2012); Applied Technological Council, 1978). In various codes such as the current United States (US) and Egyptian building codes and also in the recommendations of many researches, empirical period formulas for concrete shear wall buildings relate the building fundamental period of vibration (T) to the building overall height (H). In this paper, using the available data for the fundamental vibration period of reinforced concrete shear wall buildings measured from their motions recorded during eight California earthquakes, improved formulas for estimating the fundamental period of vibration (T) of concrete shear wall buildings are developed by regression analysis of the measured period data. The results indicate that the value of coefficient C t in the current US and Egyptian building codes formula should be decreased from its present value 0.02 to 0.014. Also, factors to limit the period calculated by rational analysis, such as Rayleigh's method, are recommended in this paper. Comparisons between the periods determined using the proposed formula and the measured values show good agreement.

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“…Building height value is an important parameter for 3D urban modeling (Shiode 2000), post-disaster assessment (Brunner et al 2010) and building period estimation (Salama 2015). Several different methods have been applied for estimation of building height information from remote sensed images or Digital Elevation Model (DEM).…”

Section: Introductionmentioning

confidence: 99%

Object Based Building Extraction and Building Period Estimation From Unmanned Aerial Vehicle Data

Çömert

Kaplan

2018

ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:The aim of this study is to examine whether it is possible to estimate the building periods with respect to the building heights in the urban scale seismic performance assessment studies by using the building height retrieved from the unmanned aerial vehicle (UAV) data. For this purpose, a small area, which includes eight residential reinforced concrete buildings, was selected in Eskisehir (Turkey) city center. In this paper, the possibilities of obtaining the building heights that are used in the estimation of building periods from UAV based data, have been investigated. The investigations were carried out in 3 stages; (i) Building boundary extraction with Object Based Image Analysis (OBIA), (ii) height calculation for buildings of interest from nDSM and accuracy assessment with the terrestrial survey. (iii) Estimation of building period using height information. The average difference between the periods estimated according to the heights obtained from field measurements and from the UAV data is 2.86% and the maximum difference is 13.2%. Results of this study have shown that the building heights retrieved from the UAV data can be used in the building period estimation in the urban scale vulnerability assessments.

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Estimation of period of vibration for concrete moment-resisting frame buildings

Cited by 16 publications

References 1 publication

Soil foundation and structure interaction effects on the estimating of fundamental period of instrumented buildings

Soil foundation and structure interaction effects on the estimating of fundamental period of instrumented buildings

Estimation of period of vibration for concrete shear wall buildings

Object Based Building Extraction and Building Period Estimation From Unmanned Aerial Vehicle Data

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