Determination of lateral strength and ductility characteristics of existing mid-rise RC buildings in Turkey

2015 ◽  
Vol 16 (3) ◽  
pp. 467-485 ◽  
Author(s):  
Taner Ucar ◽  
Onur Merter ◽  
Mustafa Duzgun
Keyword(s):  
Rc Buildings ◽  
Lateral Strength ◽  
Strength And Ductility

A Comparative Investigation of Structural Performance of Typical and Non-Ducitle Public RC Buildings Strengthened Using Friction Dampers and RC Walls

2017 ◽  
pp. 112-127 ◽  
Author(s):  
Erkan Akpinar ◽  
Seckin Ersin
Keyword(s):  
Ground Motion ◽  
Comparative Investigation ◽  
Rc Buildings ◽  
Post Intervention ◽  
Friction Dampers ◽  
History Analysis ◽  
Response History Analysis ◽  
Nonlinear Static ◽  
Selection Of

Strengthening of non-ductile public buildings is a never-ending issue. Selection of the suitable strengthening method and appropriate analysis type for the assessment of pre- and the post-intervention performances are still open to question. The displacement or drift limitations are crucial as well as demand capacity ratios for determination of such buildings performance under severe ground motion. In this chapter, an investigation of seismic performance focused on displacement criterion of strengthened non-ductile public RC buildings in Turkey is presented. Both the nonlinear static and response history analysis were conducted. Friction dampers which are fairly modern technique and conventional RC wall implementation method were introduced to as-is building. For the simplicity and the easy of the process, 2D frame selected for investigation. Comparison of the aforementioned techniques for non-ductile public RC buildings and performances particularly by means of displacement obtained using different methods for those investigated schemes are carried out and presented in the chapter.

A Comparative Investigation of Structural Performance of Typical and Non-Ducitle Public RC Buildings Strengthened Using Friction Dampers and RC Walls

2019 ◽  
pp. 1073-1089
Author(s):  
Erkan Akpinar ◽  
Seckin Ersin
Keyword(s):  
Ground Motion ◽  
Comparative Investigation ◽  
Rc Buildings ◽  
Post Intervention ◽  
Friction Dampers ◽  
History Analysis ◽  
Response History Analysis ◽  
Nonlinear Static ◽  
Selection Of

Strengthening of non-ductile public buildings is a never-ending issue. Selection of the suitable strengthening method and appropriate analysis type for the assessment of pre- and the post-intervention performances are still open to question. The displacement or drift limitations are crucial as well as demand capacity ratios for determination of such buildings performance under severe ground motion. In this chapter, an investigation of seismic performance focused on displacement criterion of strengthened non-ductile public RC buildings in Turkey is presented. Both the nonlinear static and response history analysis were conducted. Friction dampers which are fairly modern technique and conventional RC wall implementation method were introduced to as-is building. For the simplicity and the easy of the process, 2D frame selected for investigation. Comparison of the aforementioned techniques for non-ductile public RC buildings and performances particularly by means of displacement obtained using different methods for those investigated schemes are carried out and presented in the chapter.

The ECCC Approach to Creep Data Assessment

2007 ◽  
Author(s):  
Stuart R. Holdsworth
Keyword(s):  
Rupture Strength ◽  
Creep Data ◽  
Data Assessment ◽  
Long Time ◽  
Material Conditions ◽  
Original Approach ◽  
Flexible Model ◽  
Short Times ◽  
Strength And Ductility

The ECCC (European Creep Collaborative Committee) approach to creep data assessment has now been established for almost 10 years. The methodology covers the analysis of rupture strength and ductility, creep strain and stress relaxation data, for a range of material conditions. This paper reviews the concepts and procedures involved. The original approach was devised to determine Data Sheets for use by committees responsible for the preparation of National and International Design and Product Standards, and the methods developed for data quality evaluation and data analysis were therefore intentionally rigorous. The focus was clearly on the determination of long time property values from the largest possible datasets involving a significant number of observations in the mechanism regime for which predictions were required. More recently, the emphasis has changed. There is now an increasing requirement for full property descriptions from very short times to very long, and hence the need for much more flexible model representations than were previously required. There continues to be a requirement for reliable long time predictions from relatively small datasets comprising relatively short duration tests, in particular to exploit new alloy developments at the earliest practical opportunity. In such circumstances, it is not feasible to apply the same degree of rigour adopted for large dataset assessment. Current developments are reviewed.

Design Strategies for the Seismic Retrofit of Reinforced Concrete Frames

1993 ◽  
Vol 9 (4) ◽  
pp. 817-842 ◽  
Author(s):  
José A. Pincheira
Keyword(s):  
Reinforced Concrete ◽  
Design Strategies ◽  
Main Criterion ◽  
Concrete Frames ◽  
Reinforced Concrete Frames ◽  
Lateral Drift ◽  
Seismic Rehabilitation ◽  
Significant Damage ◽  
Lateral Strength ◽  
Strength And Ductility

Due to economical and practical considerations, the seismic rehabilitation of buildings is generally confined to strategic areas of the structure in which only selected elements are modified or new elements are added. While these modified or new elements can be designed to have substantial strength and ductility, studies have shown that unless the retrofit scheme is stiff enough to control lateral drifts, significant damage to existing non-strengthened elements can be expected. This paper summarizes some of the results of a series of analytical studies conducted on prototype reinforced concrete frames strengthened with some of the most commonly used rehabilitation techniques. Based on the results of these studies, a design strategy that uses lateral drift rather than lateral strength as the main criterion for the design of retrofit schemes is presented.

scholarly journals EMPIRICAL DETERMINATION OF THE FUNDAMENTAL PERIOD OF FREE VIBRATION OF RC BUILDINGS

2018 ◽  
Vol 13 (1) ◽  
Author(s):  
Andrija Radovic
Keyword(s):  
Reinforced Concrete ◽  
Free Vibration ◽  
Fundamental Period ◽  
Design Stage ◽  
Reinforced Concrete Structures ◽  
Complex Task ◽  
Rc Buildings ◽  
Approximate Methods ◽  
Empirical Determination

Determining the value of the fundamental period of vibrations of reinforced concrete structures is a complex task. In order to have certain data on the fundamental period of vibration in the earliest design stage, engineers use various approximate methods, which can quickly and simply, but still sufficiently accurate, provide an estimate of the required parameter.The paper presents the most frequently used empirical expressions describing the dependence of the fundamental period in the function of the number of storeys, or the height of the building. All of these expressions, with greater or lesser accuracy, give an estimate of the required value, as shown by a number of examples. A graphic representation of all expressions and their comparison with experimental and numerically derived values has been performed.

Lateral Strength Evaluation of Ferrocement Strengthened Masonry Infilled RC frame Based on Experimentally Observed Failure Mechanisms

2021 ◽  
Author(s):  
Debasish Sen ◽  
Hamood Alwashali ◽  
Md Shafiul Islam ◽  
Matsutaro Seki ◽  
Masaki Maeda
Keyword(s):  
Low Cost ◽  
Failure Mechanisms ◽  
Experimental Studies ◽  
Evaluation Procedure ◽  
Rc Frame ◽  
Rc Buildings ◽  
Strength Evaluation ◽  
Diagonal Compression ◽  
Lateral Strength ◽  
Ductile Behavior

Abstract In developing countries, lateral strengthening of seismically vulnerable masonry infilled RC buildings is one of the major concern. In this context, ferrocement can be used as a low cost and less labor-intensive strengthening scheme for those buildings. This study aims to experimentally identify major failure mechanisms, and to develop a lateral strength evaluation procedure of ferrocement strengthened masonry infilled RC frame. Subsequently, ductility of all of the identified major failure mechanisms is compared. Mainly four major failure mechanisms (i.e. overall flexural, column punching-joint sliding, diagonal compression, and diagonal cracking-sliding) are identified from the current experimental work and past experimental studies. The strength evaluation procedure, based on the identified failure mechanisms, is proposed and verified with an average calculated to experimental lateral strength ratio of 0.8. Among the identified failure mechanisms, overall flexural, and diagonal cracking-sliding mechanisms showed relatively ductile behavior when compared to the ductility of column punching-joint sliding, and diagonal compression failure mechanism.

scholarly journals FRP-Confined Concrete Columns: A New Procedure for Evaluating the Performance of Square and Circular Sections

2018 ◽  
Vol 2018 ◽  
pp. 1-15 ◽  
Author(s):  
Marinella Fossetti ◽  
Francesco Basone ◽  
Giuseppe D’Arenzo ◽  
Giuseppe Macaluso ◽  
Alfio Francesco Siciliano
Keyword(s):  
Concrete Columns ◽  
Confined Concrete ◽  
Analytical Models ◽  
Dissipated Energy ◽  
Element Analysis ◽  
The Many ◽  
Open Question ◽  
Semiempirical Models ◽  
Strength And Ductility

In the last few decades, the upgrading of existing reinforced concrete columns with the use of FRP jackets has met with increasing interest for its effectiveness and ease of application. The use of these kinds of jackets ensures an improvement of the affected column in terms of strength and ductility; however, the prediction of behavior of columns wrapped with FRP jackets is still an open question because of the many parameters that influence the effectiveness of the upgrading technique, and several semiempirical models are proposed. Because these models are often only applicable to specific cases, in this paper, a generalized criterion for the determination of the increase in strength, in ductility, and in dissipated energy for varying corner radius ratios of the cross section and fiber volumetric ratios is shown. Numerical results using a finite element analysis, calibrated on the basis of experimental data available in the literature, are carried out to calibrate the new analytical models. A comparison with some available models confirms the reliability of the proposed procedure.

Scientific and Methodological Base for Technical Diagnostics of Potentially Hazardous Production Facilities

2021 ◽  
pp. 7-14
Author(s):  
N.A. Makhutov ◽  
◽  
M.M. Gadenin ◽  
V.I. Ivanov ◽  
◽  
...  
Keyword(s):  
Quantitative Information ◽  
Industrial Safety ◽  
Material Strength ◽  
Technical Diagnostics ◽  
Complex Deformation ◽  
Hazardous Production ◽  
Kinetics Of ◽  
Strength And Ductility ◽  
Production Facilities

Modern requirements to industrial safety presuppose the use of scientifically based methods and means of technical diagnostics for obtaining direct quantitative information sufficient for the subsequent normative calculation determination of a set of the parameters of strength, resource, reliability, survivability and risks. It is shown that such information includes data on the accumulated and developing technological and operational defects in the load-bearing elements, on the kinetics of stress-strain states in the most loaded hazardous zones of a structure, on the thermal, chemical, biological and radiation dangerous effects, on the changes in characteristics over time of the basic mechanical properties of material strength and ductility. Such an approach to diagnostics should be linked both with the existing system of a set of equations with the diagnosed parameters included in them for the analysis of permissible, hazardous and limiting states, and with the implementation of the results of new fundamental studies of complex deformation, damage and destruction processes that determine the probability of accidents and catastrophes at the production facilities, as well as relevant applied scientific and methodological, hardware and software developments. Relevance and importance of promising research and development in this direction are associated both with the facilities of I, II classes of hazard, and the objects that are critically and strategically important for national safety.

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