scholarly journals The Thermal Response of Multi-Storeies Concrete Frame Building in the Arabic Area

2019 ◽  
Vol 9 (1) ◽  
pp. 1863-1869
Keyword(s):  
Thermal Response ◽  
Time Dependent ◽  
Column Height ◽  
Thermal Loads ◽  
Reinforced Concrete Frame ◽  
Concrete Frame ◽  
Thermal Deformations ◽  
Frame Building ◽  
Frame Buildings ◽  
The Impact

In this paper, there will be an analysis study to figure out the impact of the environment thermal loads, shrinkage and creep at multi-storeies reinforced concrete frame buildings in the Arabic area. Etabs models will be prepared considering time dependent properties of concrete and non-time dependent properties, considering two columns heights as 3m and 6m, and two supports conditions as fixed and hinged to define the major aspects affect the thermal response of multi-storey concrete frame buildings concentrating at the thermal deformations and the columns reactions, then it will be compared with the thermal response of existing concrete building considering both methodologies of time dependent properties and non-time dependent properties of concrete to define the optimum methodology to be recommended and followed The generated Etabs models confirmed that the time dependent properties method is the optimum with a clear conversion between time dependent properties model and the existing parking thermal deformations. The increment in horizontal reactions under thermal loads due to column support condition is accompanied with a reduction in horizontal slabs deformations. Column height is inversely proportional to horizontal reaction values, finally, the importance of analyzing thermal loads fluctuation at columns reactions for multi storeies buildings whereas the reactions of multi storeies cannot be predicted from single storey analysis.

scholarly journals The Thermal Response of Concrete Frame Buildings in Arabic Area Considering Time Dependent Properties of Concrete

2019 ◽  
Vol 8 (3) ◽  
pp. 7329-7335
Keyword(s):  
Reinforced Concrete ◽  
Thermal Design ◽  
Time Dependent ◽  
Column Height ◽  
Slab Thickness ◽  
Clear Understanding ◽  
Reinforced Concrete Frame ◽  
Concrete Frame ◽  
Concrete Properties ◽  
Frame Buildings

The Arabic area is known for its high temperatures especially during the summer period. It affects the structural displacements and stresses in concrete elements. The main objectives of this paper are to study the effects of thermal loads on the response of super-long reinforced concrete frame buildings in the Arabic area and regions with similar temperature variation patterns, accounting for various design aspects considering both methodologies of time dependent properties of concrete as per CEB FIP 90 code and non-time dependent properties as per ACI 224.3R. To achieve these objectives a total of 272 one story reinforced concrete frame buildings are numerically modelled and analyzed using the finite element procedures of ETABS. The models are divided into two different groups. The first group is with columns fixed supports, the second group is with columns hinged supports. Each group is analyzed twice: once with time dependent concrete properties, and another with non-time dependent concrete properties. The study findings are utilized to develop a clear understanding about mentioned variables effects at thermal deformations and columns reactions to aid structural engineers in the thermal design of super-long buildings with similar conditions of this study within time. The horizontal deformations values increase proportionally with the increase of slab length and column height. The horizontal reactions increase proportionally with the increase of slab length and slab thickness values. Fixed columns horizontal reactions are more than horizontal reactions related to hinged columns conditions while column height is inversely proportional with the lateral reaction’s values. Time dependent properties deformations and reactions ratios are around 160% the non-time dependent properties result for all cases. Ignoring this difference imposes defects, additional cracks and damages at the structures and related serviceability conditions for 70 years period.

scholarly journals A procedure for the analysis and design of ductile reinforced concrete frame buildings of moderate height

1975 ◽  
Vol 8 (4) ◽  
pp. 260-272
Author(s):  
R. L. Williams
Keyword(s):  
Reinforced Concrete ◽  
New Zealand ◽  
Brittle Failure ◽  
Design Approach ◽  
Capacity Design ◽  
Reinforced Concrete Frame ◽  
Analysis And Design ◽  
Concrete Frame ◽  
Frame Building ◽  
Frame Buildings

A procedure is presented in step by step form for designing and detailing a reinforced concrete frame building to the requirements of DZ4203 (Draft New Zealand loading code). Consideration is given for adequate ductility by means of a capacity design approach to all members to obtain a large number of plastic hinges which are detailed to dissipate energy without brittle failure. Further ductile detailing is given for all other locations where accidental hinges could occur and to limit excessive deflections that may result from deterioration of beam column joints.

scholarly journals Impact of genetically nonlinear application of external loads on the stress-strain state and on the principal vibration modes of reinforced concrete frame buildings on elastic subsoil

2019 ◽  
Vol 221 ◽  
pp. 01038 ◽  
Author(s):  
Oleg Pakhmurin ◽  
Victor Mikhaylov ◽  
Matvey Khamgushkeev
Keyword(s):  
Reinforced Concrete ◽  
Strain State ◽  
Vibration Modes ◽  
Reinforced Concrete Frame ◽  
Concrete Frame ◽  
Frame Buildings ◽  
Linear And Nonlinear ◽  
Reinforced Concrete Frame Structures ◽  
The Impact ◽  
External Loads

In this paper authors discuss the impact of genetically nonlinear application of external loads on the stress-stain state and on principal vibration modes of reinforced concrete frame structures on elastic foundation. The reader will find a methodology for integrated numerical and instrumental analysis. Six examples of linear and nonlinear FEA-models calculated in SCAD Office are given in comparison.

scholarly journals Evaluation of the impact of compliance of precast discs of overlapping on the work of the frame of a multi-storey building

2019 ◽  
Vol 97 ◽  
pp. 04022
Author(s):  
Nikolay Trekin ◽  
Emil Kodysh ◽  
Alexander Bybka ◽  
Alexander Yamalov ◽  
Nikita Konkov
Keyword(s):  
Economic Performance ◽  
Computational Models ◽  
Precast Concrete ◽  
Building Frames ◽  
Frame Building ◽  
Numerical Studies ◽  
Frame Buildings ◽  
The Impact ◽  
Structural Solutions ◽  
Storey Building

The article provides an analysis and justification of the need to take into account the compliance of discs of overlapping and coatings when calculating frames from precast concrete structures. Previously conducted full-scale experiments showed that the rigidity of the precast overlapping with full filling of the seams, in comparison with the monolithic overlapping, decreases by 3-15 times due to the ductility of the joints. The use of refined computational models of structural solutions for frames, which take into account the compliance of the conjugations of elements, makes it possible to trace possible redistribution of efforts. Such an approach when reconstructing, it is possible to optimally select and calculate the enforcement of structure, and on new designing, to increase reliability and / or improve the economic performance of frame buildings. According to the results of analytical studies, formulas were adopted for the parameters that allow one to take into account the overall compliance of overlapping disks and coatings in computational models of building frames. Numerical studies on the computational model of a frame building made it possible to evaluate the effect of accounting for compliance on the stress-strain state of a multi-storey frame.

scholarly journals Challenges in Evaluating Seismic Collapse Risk for RC Buildings

2021 ◽  
Vol 15 (1) ◽  
Author(s):  
Jin Zhou ◽  
Zhelun Zhang ◽  
Tessa Williams ◽  
Sashi K. Kunnath
Keyword(s):  
Ground Motion ◽  
Seismic Vulnerability ◽  
Ground Motions ◽  
Primary System ◽  
Fragility Functions ◽  
Reinforced Concrete Frame ◽  
Ground Motion Selection ◽  
Concrete Frame ◽  
Frame Building ◽  
Seismic Collapse

AbstractThe development of fragility functions that express the probability of collapse of a building as a function of some ground motion intensity measure is an effective tool to assess seismic vulnerability of structures. However, a number of factors ranging from ground motion selection to modeling decisions can influence the quantification of collapse probability. A methodical investigation was carried out to examine the effects of component modeling and ground motion selection in establishing demand and collapse risk of a typical reinforced concrete frame building. The primary system considered in this study is a modern 6-story RC moment frame building that was designed to current code provisions in a seismically active region. Both concentrated and distributed plasticity beam–column elements were used to model the building frame and several options were considered in constitutive modeling for both options. Incremental dynamic analyses (IDA) were carried out using two suites of ground motions—the first set comprised site-dependent ground motions, while the second set was a compilation of hazard-consistent motions using the conditional scenario spectra approach. Findings from the study highlight the influence of modeling decisions and ground motion selection in the development of seismic collapse fragility functions and the characterization of risk for various demand levels.

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