Parametric Study on the Influence of Bays Number and Frame-Span Length on the Redundancy Indices of Reinforced Concrete Structures

2016 ◽  
Vol 845 ◽  
pp. 259-264
Author(s):  
Mutiara Puspahati Cripstyani ◽  
Stefanus Adi Kristiawan ◽  
Edy Purwanto
Keyword(s):  
Reinforced Concrete ◽  
Parametric Study ◽  
Load Distribution ◽  
Three Dimensional ◽  
Alternative Possibilities ◽  
Span Length ◽  
Reinforced Concrete Structure ◽  
Strength Index ◽  
Capacity Curves ◽  
Variation Index

The role of redundancy in a structure that receives earthquake load is very important. It provides alternative possibilities of load distribution in the event of a local collapse of the system before it reaches the total collapse of the structure. This mechanism of load distribution provides time for the users of the building to escape. A parametric study is carried out to investigate the effect of bays number and frame-span length in order to identify factors affecting the redundancy of the reinforced concrete structural system. Non-linear analysis (pushover) using SAP2000 on three-dimensional structural frames system are performed to obtain the capacity curves of the structures from which redundancies are calculated. Redundancy on the system is determined into two redundancy indices i.e. redundancy strength index (rs) and redundancy variation index (rv) which are, respectively, deterministic and probabilistic measure of the stuctural redundancy. This study points out that frame-span length has more significant effect on redundancy indices compared to the bays number. It is also shown that a reinforced concrete structure with a higher redundancy strength index tends to have a lower redundancy variation index.

scholarly journals Development and Verification of the Capacity Curve for Two Dimensional Reinforced Concrete Moment-Resisting Frames System under Earthquake Loading

2021 ◽  
Vol 27 (6) ◽  
pp. 73-96
Author(s):  
Haider A Abass ◽  
Husain Khalaf Jarallah
Keyword(s):  
Reinforced Concrete ◽  
Plastic Hinge ◽  
Pushover Analysis ◽  
Three Dimensional ◽  
Automatic Identification ◽  
Two Dimensional ◽  
Seismic Evaluation ◽  
Concrete Frames ◽  
Capacity Curves ◽  
Comparison Of The Results

Pushover analysis is an efficient method for the seismic evaluation of buildings under severe earthquakes. This paper aims to develop and verify the pushover analysis methodology for reinforced concrete frames. This technique depends on a nonlinear representation of the structure by using SAP2000 software. The properties of plastic hinges will be defined by generating the moment-curvature analysis for all the frame sections (beams and columns). The verification of the technique above was compared with the previous study for two-dimensional frames (4-and 7-story frames). The former study leaned on automatic identification of positive and negative moments, where the concrete sections and steel reinforcement quantities the source of these moments. The comparison of the results between the two methodologies was carried out in terms of capacity curves. The results of the conducted comparison highlighted essential points. It was included the potential differences between default and user-defined hinge properties in modeling. The effect of the plastic hinge length and the transverse of shear reinforcement on the capacity curves was also observed. Accordingly, it can be considered that the current methodology in this paper more logistic in the representation of two and three-dimensional structures.  

scholarly journals Numerical study of the behaviour of loop bar splicing in joints of reinforced concrete structures

2019 ◽  
Vol 12 (1) ◽  
pp. 39-68
Author(s):  
T. D. L.VASCONCELOS ◽  
V. G. HAACH
Keyword(s):  
Reinforced Concrete ◽  
Numerical Study ◽  
Three Dimensional ◽  
Concrete Structures ◽  
Experimental Tests ◽  
Reinforced Concrete Structures ◽  
Reinforced Concrete Structure ◽  
Ideal Situation ◽  
Parametric Analyses ◽  
Concrete Elements

Abstract Sometimes straight bar splicing takes up too much space in a reinforced concrete structure due to the required overlapping length. Therefore, in limited space situations, loop joints may be a good solution, which has been spread in civil construction, although there are very few studies about it. The aim of the present work is to study the loop joint behavior in reinforced concrete structures under tension. Three dimensional numerical simulations are made using the software DIANA®. Firstly, the calibration of the numerical model based on experimental tests of the literature is performed, followed by parametric analyses varying geometric parameters of the concrete elements and reinforcement. The results indicate that arranging the bars as close as possible to a maximum spacing of 60 mm between axes and considering a minimum splice length equal to the bend diameter of the loops may be an ideal situation for the behavior of this type of connection.

scholarly journals Numerical investigation of reinforced-concrete beam-column joints retrofitted using external superelastic shape memory alloy bars

2021 ◽  
Vol 8 (5) ◽  
pp. 716-738
Author(s):  
Yamen Ibrahim Elbahy ◽  
◽  
Maged A. Youssef ◽  
M. Meshaly ◽  
◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Shape Memory ◽  
Parametric Study ◽  
Linear Regression Analysis ◽  
Three Dimensional ◽  
Element Model ◽  
Multiple Linear Regression Analysis ◽  
Reinforced Concrete Beam ◽  
Rc Structures ◽  
Three Dimensional Finite Element

<abstract> <p>The unique properties of Shape Memory Alloys (SMAs) have motivated researchers to use them as primary reinforcement in reinforced concrete (RC) structures. In this study, the applicability of using external unbonded SMA bars to retrofit RC beam-column joints (BCJs) is investigated. A three-dimensional finite element model, which simulates the suggested retrofitting technique, is first developed, and validated using ABAQUS software. The model is then further simplified and utilized to conduct a parametric study to investigate the behaviour of SMA retrofitted RC BCJs. Results of the parametric study are used to perform multiple linear regression analysis. Simple equations, which can be used to calculate the length and amount of SMA bars required to retrofit a RC BCJ, are then developed.</p> </abstract>

Evaluation of a Gravity Load Designed Reinforced Concrete Structure Failed under its Own Weight due to Creep in Concrete

2013 ◽  
Vol 747 ◽  
pp. 441-444
Author(s):  
Mevlut Yasar Kaltakci ◽  
Hasan Husnu Korkmaz ◽  
Mehmet Kamanli ◽  
Murat Ozturk ◽  
Musa Hakan Arslan
Keyword(s):  
Reinforced Concrete ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Central Anatolia ◽  
Reinforced Concrete Structure ◽  
Building Stock ◽  
Gravity Load ◽  
Moment Resisting ◽  
The One ◽  
Recent Earthquakes

Turkish building stock is commonly composed of reinforced concrete moment resisting frames. Recent earthquakes in Turkey resulted thousands of failed or heavily damaged residential houses and office buildings. In addition of the earthquake failures, reinforced concrete structures may also failed only under their own weight. There are several examples such as Hicret Apartment in Diyarbakir (1983), Zumrut Apartment in Konya, in central Anatolia, Huzur Apartment in Istanbul (2007). On February 2nd, 2004 a 9-story reinforced concrete building in Konya (Zumrut Apartment) collapsed leaving 92 people dead. The first author of the paper was governmentally charged about the investigation of the failure causes. Carrot samples were taken from the concrete columns and steel samples were obtained from the disaster area. The dimensions of the structural members were determined. The structure was modeled in three dimensional space and vertical collapse analyses were conducted. The one of the main cause of failure was determined as the creep of the concrete occurred in excessively loaded columns. The main reasons of the damages and failures were determined to be the insufficiency in material quality, mistakes made in load selection and the inappropriate load-carrying dimensions. The construction mistakes and not obeying the design drawings are the other flaws. In this paper detailed information about the structure, creep analyses and vertical collapse analyze results were depicted in understandable format.

scholarly journals persamaan empiris waktu getar alami struktur pelat datar beton bertulang berdasarkan hasil analisis vibrasi 3 dimensi

2016 ◽  
Vol 13 (2) ◽  
pp. 116
Author(s):  
Agus Setiawan
Keyword(s):  
Reinforced Concrete ◽  
Flat Plate ◽  
Concrete Structure ◽  
Three Dimensional ◽  
Frame Structure ◽  
Fundamental Period ◽  
Reinforced Concrete Structure ◽  
Base Shear ◽  
Standard Code ◽  
Steel Frame Structure

persamaan empiris waktu getar alami struktur pelat datar beton bertulang berdasarkan hasil analisis vibrasi 3 dimensiEmpirical Formula for Fundamental Period of Flate Plate Reinforced Concrete Structure Based on 3 Dimentional Vibration AnalysisAgus SetiawanJurusan Teknik Sipil, Fakultas Teknik,Universitas Pembangunan Jaya Alamat Korespondensi : BJl. Cendrawasi, Ciputat, Sawah Baru, Tangerangan Selatan, Banten 15413Email : [email protected] of the parameters required in the calculation of seismic base shear on a structure is the fundamental period of the structure. The fundamental period of structure can be obtained through three-dimensional dynamic analysis of the structure. Indonesian Standard Code for Earthquake Resistance Building, SNI 1726-2012, given some empirical equations to calculate the fundamental period ofsome structural system. Some of the given equation can be used for concrete and steel frame structure. However, for the flat plate reinforced concrete structure, sometimes the fundamental period approached as “other structural systems”, which of course can not be shown for accuracy. This study was conducted to obtain an empirical equation that can be used to calculate the fundamental periodof a flat plate structure. The flat plate reinforced concrete structure model being analyzed is vary in total floor number, which varies from 1 to 10 floors, and the width of the building from 20 to 28 meters. From the analysis results obtained relationship between fundamental period, building width and building height in the form Ta = 0,0022(B)’”hn1,15, for the un-cracked section. And Ta = 0,0025(B)’”hn1,28, for the condition of cracked cross-section, with Tn is fundamental period, B is the width of the building plan, and hn is the height of the building.Keywords : Time Period, Flat Plate, Reinforced ConcreteAbstrakSalah satu parameter yang diperlukan dalam perhitungan gaya geser dasar seismik pada suatu struktur adalah besarnya waktu getar alami dari struktur tersebut. Nilai waktu getar alami struktur dapat diperoleh melalui hasil analisis dinamik 3 dimensi dari struktur tersebut. Namun dalam Standar Perencanaan Ketahanan Gempa SNI 1726-2012, juga diberikan beberapa persamaan empiris untuk menghitung waktu getar alami struktur. Beberapa persamaan yang diberikan dapat digunakan untuk sistem struktur rangka beton dan baja. Namun untuk sistem struktur berupa pelat datar (flat plate) beton bertulang, terkadang nilai waktu getarnya didekati sebagai “sistem struktur lainnya”, yang tentu saja tidak dapat ditunjukkan keakuratannya. Penelitian ini dilakukan dengan tujuan untuk mendapatkan persamaan empiris yang dapat digunakan untuk menghitung waktu getar alami suatu struktur pelat datar. Model yang dianalisis berupa struktur pelat datar beton bertulang, dengan jumlah lantai bervariasi dari 1 hingga 10 lantai, serta lebar bangunan dari 20 hingga 28 meter. Dari hasil analisis diperoleh hubungan waktu getar alami dengan lebar bangunan dan tinggi bangunan dalam bentuk Ta = 0,0022(B)’”hn1,15, untuk kondisi penampang utuh. Serta Ta = 0,0025(B)’”hn1,28, untuk kondisi penampang retak, dengan Tn adalah waktu getar alami, B adalah lebar denah bangunan, serta hn adalah tinggi bangunan.Kata kunci : Waktu Getar Alami, Pelat Datar, Beton Bertulang

scholarly journals Simulation of Real Defect Geometry and Its Detection Using Passive Magnetic Inspection (PMI) Method

2018 ◽  
Vol 8 (7) ◽  
pp. 1147 ◽  
Author(s):  
Milad Mosharafi ◽  
SeyedBijan Mahbaz ◽  
Maurice Dusseault
Keyword(s):  
Reinforced Concrete ◽  
Three Dimensional ◽  
Laser Scanner ◽  
Time History ◽  
Magnetic Behavior ◽  
Financial Risks ◽  
Reinforcing Steel ◽  
Reinforced Concrete Structure ◽  
Finite Element Software ◽  
History Of

Reinforced concrete is the most commonly used material in urban, road, and industrial structures. Quantifying the condition of the reinforcing steel can help manage the human and financial risks that arise from unexpected reinforced concrete structure functional failure. Also, a quantitative time history of reinforcing steel condition can be used to make decisions on rehabilitation, decommissioning, or replacement. The self-magnetic behavior of ferromagnetic materials is useful for quantitative condition assessment. In this study, a ferromagnetic rebar with artificial defects was scanned by a three-dimensional (3D) laser scanner. The obtained point cloud was imported as a real geometry to a finite element software platform; its self-magnetic behavior was then simulated under the influence of Earth’s magnetic field. The various passive magnetic parameters that can be measured were reviewed for different conditions. Statistical studies showed that 0.76% of the simulation-obtained data of the rebar surface was related to the defect locations. Additionally, acceptable coincidences were confirmed between the magnetic properties from numerical simulation and from experimental outputs, most noticeably at hole locations.

Numerical investigation on damage performance of a reinforced concrete structure subjected to machine loads

2020 ◽  
Vol 6 (3) ◽  
pp. 132
Author(s):  
Memduh Karalar ◽  
Murat Çavuşli
Keyword(s):  
Reinforced Concrete ◽  
Carrying Capacity ◽  
Structural Engineering ◽  
3D Model ◽  
Three Dimensional ◽  
Reinforced Concrete Structure ◽  
Rc Structures ◽  
Machine Element ◽  
Rc Structure ◽  
Capacity Performance

Investigation of carrying capacity performance of reinforced concrete (RC) structures is very important for structural engineering. In this study, it is aimed to examine the nonlinear carrying capacity performance of an RC laboratory structure by using three dimensional (3D) modelling approach. For this purpose, Zonguldak Bulent Ecevit University Laboratory Structure is selected and it is modeled as three dimensional by utilizing IDECAD static software. After modelling all beams, columns and floors according to 2018 Turkish earthquake code, concrete classes are determined for all bearing elements and specified concrete classes are defined for all elements of 3D model. Then, structure is analyzed for empty situation (Case 1) and structural performance of building is analyzed to this situation. In the past, a flat of this RC structure has been exposed to strong machine loads. For this reason, a machine which is fixed on the floor is placed in the 3D model and RC structure is analyzed considering nonstructural machine element loads (Case 2). According to analysis results, Case 1 is compared with Case 2 and it is clearly seen that nonstructural machine loads effect nonlinear carrying capacity performance of RC buildings.

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