scholarly journals Factors in the Relationship Between Optimal CO2 Emission and Optimal Cost of the RC Frames

2020 ◽  
Author(s):  
Lida Mottaghi ◽  
Ramezan Ali Izadifard ◽  
Ali Kaveh
Keyword(s):  
Reinforced Concrete ◽  
Co2 Emissions ◽  
Carbon Dioxide Emissions ◽  
Reinforced Concrete Frame ◽  
Optimal Cost ◽  
Concrete Frame ◽  
Rc Frames ◽  
Greenhouse Gases Emissions ◽  
The Cost ◽  
The Relationship

Nowadays, reduction of greenhouse gases emissions from the construction industry is seriously under investigation. The aim of this study is to investigate the various effective factors on the relationship between optimal cost and optimal carbon dioxide emissions of the reinforced concrete structures with nonlinear structural behavior. A four-story reinforced concrete frame is designed for various peak ground accelerations (PGAs) and all ductility classes according to Iran’s seismic resistant design-2800 code, as well as for different concrete classes. The frames are optimally designed according to ACI 318-08 and FEMA codes. The results of optimal designs show that the design of structures with medium and high ductility class produces less cost and CO2 emissions than the low ductility class. On the other hand, the relationship between cost and CO2 emissions shows that in the low ductility class, increasing the percentage of the optimal cost can greatly reduce the amount of CO2 emissions. PGA design has a significant effect on reducing optimal cost and CO2 emissions. Especially in the low ductility class, reducing this parameter can greatly decrease the amount of the objective functions. Also, the use of concrete with low class can reduce the cost and CO2 emissions but the effect of this parameter in the objective is very small.

Application of Value Engineering to the Ductility Design of RC Frame Columns with High Compression Ratio

2011 ◽  
Vol 255-260 ◽  
pp. 279-283
Author(s):  
Jun Qing Guo ◽  
Zhou Can Fu
Keyword(s):  
Reinforced Concrete ◽  
Design Method ◽  
Value Engineering ◽  
Reinforced Concrete Frame ◽  
Factors Affecting ◽  
Concrete Frame ◽  
High Compression ◽  
Major Factors ◽  
The Cost ◽  
Made In

This paper expatiates the prominent effect of axial compression ratios on the ductility of reinforced concrete frame columns and the limits of the ratios in Code for Seismic Design of Buildings and summarizes the ductility design methods of frame columns with high compression ratios. The principles of value engineering were adopted to analyze the major factors affecting the ductility of reinforced concrete frame columns. The cost of columns with high compression ratios and different types of ties in a real project was calculated and relevant analysis and evaluations were conducted according to Value Coefficient Discriminance. At last the optimum ductility design method for frame columns with high compression ratios was put forth, with which reference can be made in design.

Response of Mid-Rise Reinforced Concrete Frame Buildings to the 2017 Puebla Earthquake

2019 ◽  
Vol 35 (4) ◽  
pp. 1763-1793 ◽  
Author(s):  
Carlos A. Arteta ◽  
Julian Carrillo ◽  
Jorge Archbold ◽  
Daniel Gaspar ◽  
Cesar Pajaro ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
The United States ◽  
Rc Buildings ◽  
Reinforced Concrete Frame ◽  
Infill Walls ◽  
Concrete Frame ◽  
Soft Story ◽  
Masonry Infills ◽  
Rc Frames ◽  
Ductility Capacity

The response of mid-rise reinforced concrete (RC) buildings in Mexico City after the 2017 Puebla Earthquake is assessed through combined field and computational investigation. The Mw 7.1 earthquake damaged more than 500 buildings where most of them are classified as mid-rise RC frames with infill walls. A multinational team from Colombia, Mexico, and the United States was rapidly deployed within a week of the occurrence of the event to investigate the structural and nonstructural damage levels of over 60 RC buildings with 2–12 stories. The results of the study confirmed that older mid-rise structures with limited ductility capacity may have been shaken past their capacity. To elucidate the widespread damage in mid-rise RC framed structures, the post-earthquake reconnaissance effort is complemented with inelastic modeling and simulation of several representative RC framing systems with and without masonry infill walls. It was confirmed that the addition of non-isolated masonry infills significantly impacts the ductility capacity and increases the potential for a soft-story mechanism formation in RC frames originally analyzed and designed to be bare systems.

Multi-Objective Optimization Design of Hybrid Structure

2011 ◽  
Vol 243-249 ◽  
pp. 20-25
Author(s):  
Shan Suo Zheng ◽  
Zhi Qiang Li ◽  
Yi Hu ◽  
Qing Lin Tao ◽  
Wei Wang
Keyword(s):  
Reinforced Concrete ◽  
Optimization Design ◽  
Failure Modes ◽  
Hybrid Structure ◽  
Wall Structure ◽  
Reinforced Concrete Frame ◽  
Core Tube ◽  
Structure Damage ◽  
Concrete Frame ◽  
The Cost

The primary goal of failure modes-based optimization design which is to study the performance of structure without shocking absorption device is to transform the non-ideal failure modes of structure into the ideal failure modes, and then a small probability of the structure damage can be obtained. Although the study of this field is significant, no paper has so far attempted to study. Taking the cost of the structure into consideration, this paper aims at the failure modes-based optimization design. Therefore, an optimal approach based on failure modes with the ability to limit the cost is proposed. The procedure to obtain the failure modes-based optimization includes two phases, the concrete optimization and the shaped steel optimization. At last a reinforced concrete frame-shear wall structure is cited to verify the method developed. It is concluded that the method can supply an effective way to reduce both the damage and the cost of steel reinforced concrete framework-core tube structure.

scholarly journals COMPUTER TECHNOLOGIES IN THE FORMATION OF COMPUTED MODELS OF MONOLITHIC REINFORCED CONCRETE STRUCTURES

2017 ◽  
Vol 13 (4) ◽  
pp. 37-46 ◽  
Author(s):  
Anatoliy I. Bedov ◽  
Aleksandr S. Salov ◽  
Azat I. Gabitov ◽  
Dmitriy М. Kuznetsov ◽  
Elza A. Sadykova
Keyword(s):  
Reinforced Concrete ◽  
Analytical Models ◽  
Structural Elements ◽  
Reinforced Concrete Frame ◽  
Concrete Element ◽  
Concrete Frame ◽  
Numerical Studies ◽  
Deformation State ◽  
Rational Combination ◽  
The Relationship

The areas of application of concrete and reinforcement of higher grades for strength in structural elements of a monolithic reinforced concrete frame are considered. Analytic dependencies, criteria and boundary conditions are proposed that numerically describe the relationship between increasing the strength of concrete and reducing the consumption of reinforcing steel for bent and compressed-bent elements. Calculation-analytical models of the deformation state of overlaps of a monolithic reinforced concrete multi-storey frame have been developed on the basis of multifactor numerical studies carried out for various values of the thicknesses of ceilings, spans, operating loads, classes of concrete and reinforcement. Calculated parameters of slabs are determined, which determine their bearing capacity. On the basis of computer technology, the optimum section of a reinforced concrete element is modeled according to the criterion of reducing the material consumption and rational combination of classes of concrete and reinforcement.

Seismic Vulnerability of Reinforced Concrete Frame with Unreinforced Masonry Infill Due to Main Shock–Aftershock Earthquake Sequences

2015 ◽  
Vol 31 (3) ◽  
pp. 1427-1449 ◽  
Author(s):  
Solomon Tesfamariam ◽  
Katsuichiro Goda ◽  
Goutam Mondal
Keyword(s):  
Reinforced Concrete ◽  
Seismic Vulnerability ◽  
Main Shock ◽  
Ground Motions ◽  
Period Change ◽  
Reinforced Concrete Frame ◽  
Site Class ◽  
Concrete Frame ◽  
Rc Frames ◽  
Hazard Level

This paper presents a parametric study on the inelastic response of six-story reinforced concrete (RC) frames subjected to main shock–aftershock (MS-AS) ground motions. For this purpose, one bare frame (BF) and four masonry RC frames with two infill thicknesses (75 mm or 125 mm) and two infill patterns (open ground story or fully infilled) are considered. They are situated at site class C in Vancouver, Canada, and are designed for office occupancy according to the 2005 National Building Code of Canada. The five frames are subjected to 100 ensembles of MS-AS ground motions scaled to seismic hazard level corresponding to the return period of 2,500 years. For each sequence of earthquakes, change in the fundamental period ( T1) and inter-story drift (ISD) for both MS-AS sequences are quantified. The analysis results show that the period change and ISD were significant for BF, whereas the infilled frames sustained small damage with negligible change in T1.

Seismic Behavior of Reinforced Concrete Frame Columns with Different Volumetric Percentage of Stirrups

2012 ◽  
Vol 166-169 ◽  
pp. 2046-2049 ◽  
Author(s):  
Shan Suo Zheng ◽  
Yue Heng Yan ◽  
Qing Lin Tao ◽  
Wen Yong Li
Keyword(s):  
Reinforced Concrete ◽  
Seismic Behavior ◽  
Low Frequency ◽  
Reinforced Concrete Frame ◽  
Reinforced Concrete Column ◽  
New Members ◽  
Skeleton Curve ◽  
Concrete Frame ◽  
The Relationship ◽  
Constant Axial Load

Based on the experiments of a reinforced concrete frame column, 5 new members with different volumetric percentage of stirrups which are applied with constant axial load and horizontal low-frequency cyclic load are analyzed with ABAQUS. This paper aims to study the relationship between volume-stirrup ratio and seismic behavior of reinforced concrete column. By analyzing skeleton curve and hysteretic curve of members, the results show that, if stirrups are reasonably arranged and the volume-stirrup ratio is larger enough, the good ductility, carrying capacity, energy dissipation capacity, and seismic behavior still be obtained with high axial compression ratio.

Behaviour of reinforced concrete frames rehabilitated with concentric steel bracing

2000 ◽  
Vol 27 (3) ◽  
pp. 433-444 ◽  
Author(s):  
H Abou-Elfath ◽  
A Ghobarah
Keyword(s):  
Reinforced Concrete ◽  
Seismic Performance ◽  
Concrete Frames ◽  
Reinforced Concrete Frame ◽  
Simplified Approach ◽  
Concrete Frame ◽  
Rc Frames ◽  
Damage Indices ◽  
Steel Bracing ◽  
Story Building

The seismic performance of low-rise nonductile reinforced concrete (RC) buildings rehabilitated using concentric steel bracing is investigated. A three-story building was analysed using various ground motion records. The effectiveness of the steel bracing in rehabilitating the three-story building was examined. The effect of the distribution of the steel bracing along the height of the RC frames on the seismic performance of the rehabilitated building was studied. The behaviour of the nonductile RC frame members is represented using a beam-column element capable of modelling the strength softening and the effects of the axial force on the yield moment and the deformation capacities at peak strength of these members. The performance of the building is evaluated in terms of global and story drifts and damage indices. A simplified approach is proposed for selecting the proper brace distribution.Key words: reinforced concrete, frame, nonductile, rehabilitation, concentric steel brace.

scholarly journals Vibration-Based Damage Evaluation of a Reinforced Concrete Frame Subjected to Cyclic Pushover Testing

2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Burcu Gunes ◽  
Oguz Gunes
Keyword(s):  
Reinforced Concrete ◽  
Promising Result ◽  
Reinforced Concrete Frame ◽  
Concrete Frame ◽  
Vibration Data ◽  
Rc Frames ◽  
Drift Ratio ◽  
Before And After ◽  
Plane Frame ◽  
Observed Damage

This research investigated the changes in vibration characteristics of a simple reinforced concrete (RC) frame subjected to incremental cyclic pushover testing as a basis for detection, quantification, and localization of damage in RC frames using vibration data obtained before and after a seismic event. A half-scale one-story one-bay plane frame was subjected to progressive damage through cyclic lateral loading to incrementally increasing drift ratios. Ambient and impact vibration tests were performed at each increment of drift ratio, and modal analyses of the acceleration responses obtained at seven locations on the frame were carried out with the acceleration responses measured at seven different locations on the frame to track changes in the dynamic characteristics. Linear degradation of the lowest two vibration frequencies was identified with increasing drift ratio, which was regarded as a promising result towards detection and quantification of damage. For localization, a flexibility-based damage localization procedure, the damage locating vector (DLV) approach, was explored. Localization results mostly agreed with the observed damage, and the approach was found to have potential for use in prioritizing the suspected damage locations in the structure for detailed inspections.

scholarly journals Seismic Design Of Low-Rise Office Buildings According To Romanian Seismic Codes. Case Study.

2015 ◽  
Vol 11 (2) ◽  
pp. 10-18
Author(s):  
Ana-Maria Ghiţă
Keyword(s):  
Reinforced Concrete ◽  
Systems Design ◽  
Tubular Structures ◽  
Reinforced Concrete Frame ◽  
Seismic Code ◽  
Concrete Frame ◽  
Rc Frames ◽  
Study Case ◽  
Reinforced Concrete Frame Structures

Abstract The paper presents a study case and highlights the changes made by the new, in force, seismic Code P100-1/2013 in comparison with the former P100-1/2006, concerning the reinforced concrete frame structural systems design. Different seismic designed RC frames systems, compatible with modern office requirements, were studied. The influence of the earthquake codes provisions on design of regular buildings, having openings fitted for open spaces, with a story height of 3.50m, was assessed. The benefits of tubular structures, with rigid frames made of closely spaced columns on the building perimeter, were analyzed as well. The results of the study case are presented emphasizing the consequences of the application of the new seismic Code on the computation of the reinforced concrete frame structures.

Failure Modes-Based Multi-Objective Optimization Design of Steel Reinforced Concrete Frame Structures

2010 ◽  
Vol 450 ◽  
pp. 219-222 ◽  
Author(s):  
Shan Suo Zheng ◽  
Zhi Qiang Li ◽  
Bin Wang ◽  
Lei Li ◽  
Wei Wang
Keyword(s):  
Reinforced Concrete ◽  
Optimization Design ◽  
Failure Modes ◽  
Frame Structure ◽  
Reinforced Concrete Frame ◽  
Earthquake Intensity ◽  
Steel Reinforced Concrete ◽  
Concrete Frame ◽  
Reinforced Concrete Frame Structure ◽  
The Cost

The frame structure designed with the existing design code in zones of high earthquake intensity doesn’t satisfy with the expectation of strong column–weak beam. Therefore, a new optimal approach based on failure modes with the ability to limit the cost and the damage is proposed. In the process of optimization design, all the stories of a building with the same interstory drift is defined to obtiain the minor damage, while the damage values of beams and columns are difined to obtain the except failure modes. At last a six-story steel reinforced concrete frame structure is designed to verify the method developed inhere. It is concluded that the method can supply an effective way to reduce both the damage and the cost of steel reinforced concrete frame structure, and can obtain the except failure modes.

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