scholarly journals Numerical Modeling of Masonry Infilled Reinforced Concrete Building during Construction Stages Using ABAQUS Software

Buildings ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 181 ◽  
Author(s):  
Boudjamaa Roudane ◽  
Süleyman Adanur ◽  
Ahmet Can Altunışık
Keyword(s):  
Reinforced Concrete ◽  
Natural Frequencies ◽  
Ambient Vibration ◽  
Mode Shapes ◽  
Analysis Model ◽  
Reinforced Concrete Building ◽  
Finite Element Software ◽  
Comparison Results ◽  
Concrete Building ◽  
Abaqus Software

The effects of seismic actions on reinforced concrete (RC) structures are strongly influenced by the dynamic behavior of their materials. It is crucial to find a simple definition of the natural frequencies of reinforced concrete buildings, particularly in relation to both principal and secondary elements constructing the reinforced concrete building type. This paper firstly presents a comparison with the ambient vibration surveys. An analysis model of different stages of construction of the reinforced concrete masonry wall was compared using the finite element software. In the second step, structural responses of the model were investigated by means of static analysis. Three main types were examined: Bare frame for one, two and three storeys; brick-walled; and coated cases. Modal analysis is carried out by ABAQUS software starting from the deformed building, to provide the natural frequencies and mode shapes. For the natural frequencies, a good agreement is obtained between analytical and experimental results. Furthermore, the comparison results between different cases show that the application of the plaster work increases the lateral stiffness and has significant effects on the dynamic response of the buildings.

scholarly journals Seismic Behavior of Mid-Rise Precast Reinforced Concrete Building with Effect of Joints and Supports

2019 ◽  
Vol 8 (4) ◽  
pp. 3633-3637
Keyword(s):  
Reinforced Concrete ◽  
Response Spectrum ◽  
Precast Concrete ◽  
Mode Shapes ◽  
Base Shear ◽  
Reinforced Concrete Building ◽  
Axial Forces ◽  
Building Models ◽  
Precast Buildings ◽  
Concrete Building

Precast concrete structures are widely used in construction. It consists of prefabricated elements casted in industry and connected to each other to form a homogeneous structure. Connections function is to transfer moments and axial forces. Many engineers assume precast connection as pinned, but in reality, they are semi-rigid connections that transfer forces to other members. Lack of design and detailing of connection leads to improper behaviour of the structure, which then leads to the collapse of the building. Past earthquake studies show that many precast buildings performed poorly, and the main reasons were connections. This paper mainly focuses on understanding the seismic behaviour of mid-rise i.e seven-storey precast reinforced concrete buildings with various beam-column joints i.e rigid, semi-rigid, pinned and column-base supports i.e, fixed and hinged supports. Building is modelled and analyzed using ETABS v17 software. Rotational stiffness of precast billet connection is adopted for modelling of semi-rigid beam-column connections. Response spectrum and modal analysis are carried out. Results of displacements, storey drift, storey shear, storey stiffness, base shear, time periods and first mode shapes of models are discussed. It is observed, precast reinforced concrete building models with semi rigid connection performs better than building models with pinned connections and building models with fixed supports reduces the structural response to a great extent.

scholarly journals Progressive Collapse Analysis of Three Dimensional Two Bay Five Storey Bare and Infilled Frames under Corner and Middle Column Removal

2019 ◽  
Vol 8 (4) ◽  
pp. 4749-4753
Keyword(s):  
Reinforced Concrete ◽  
Cement Mortar ◽  
Progressive Collapse ◽  
Three Dimensional ◽  
Reinforced Concrete Building ◽  
Infilled Frame ◽  
Finite Element Software ◽  
Column Removal ◽  
Concrete Building ◽  
Middle Column

Demand Capacity Ratio (DCR) assessment of the structural progressive collapse of two bay five storey bare frame without wall load , bare frame with wall load and Infilled frame with cement mortar (IFCM). IN this paper linear static analysis is carried out under corner and middle column removal base on GSA guidelines. Finite element software was used to design two bay five storey reinforced concrete building frame using Indian Standard (IS code). Finally all the three cases according to the progressive collapse resistant behaviour indicator DCR values to investigate in ability in progressive collapse, this present result shows Infilled frame with cement mortar shows to prevent the progressive collapse of Reinforced concrete building

scholarly journals Forced Vibration Testing of a Four-Story Reinforced Concrete Building Utilizing the nees@UCLA Mobile Field Laboratory

2008 ◽  
Vol 24 (4) ◽  
pp. 969-995 ◽  
Author(s):  
Eunjong Yu ◽  
Derek Skolnik ◽  
Daniel H. Whang ◽  
John W. Wallace
Keyword(s):  
Reinforced Concrete ◽  
Harmonic Excitation ◽  
Ambient Vibration ◽  
Mode Shapes ◽  
Northridge Earthquake ◽  
Vibration Data ◽  
Field Laboratory ◽  
Concrete Building ◽  
Rc Building ◽  
Low Amplitude

The nees@UCLA mobile field laboratory was utilized to collect forced and ambient vibration data from a four-story reinforced concrete (RC) building damaged in the 1994 Northridge earthquake. Both low amplitude broadband and moderate amplitude harmonic excitation were applied using a linear shaker and two eccentric mass shakers, respectively. Floor accelerations, interstory displacements, and column and slab curvature distributions were monitored during the tests using accelerometers, linear variable differential transformers (LVDTs) and concrete strain gauges. The use of dense instrumentation enabled verification of common modeling assumptions related to rigid diaphragms and soil-structure-interaction. The first six or seven natural frequencies, mode shapes, and damping ratios were identified. Significant decreases in frequency corresponded to increases in shaking amplitude, most notably in the N-S direction of the building, most likely due to preexisting diagonal joint cracks that formed during the Northridge earthquake.

scholarly journals Ambient Vibration Test of a 18-Story Reinforced Concrete Building

2018 ◽  
Vol 53 ◽  
pp. 03077
Author(s):  
Jun Ma ◽  
Jie Ge
Keyword(s):  
Reinforced Concrete ◽  
Domain Decomposition ◽  
Frequency Domain ◽  
Dynamic Properties ◽  
Ambient Vibration ◽  
Vibration Test ◽  
Ambient Vibration Test ◽  
Reinforced Concrete Building ◽  
Concrete Building ◽  
Frequency Domain Decomposition

Ambient vibration analysis of a 18-story reinforced concrete building was carried out to investigate its dynamic properties. Ambient vibration test was conducted on the building, and modal parameters including natural frequencies and damping ratios were identified using the Frequency domain decomposition (FDD) method and the Enhanced frequency domain decomposition (EFDD) method. The results demonstrate that ambient vibration test is a feasible and efficient technique to excite structures, and that FDD and EFDD methods are reliable and efficient techniques for ambient vibration data.

Soft storey effects on plastic hinge propagation of moment resisting reinforced concrete building subjected to Ranau earthquake

2017 ◽  
Author(s):  
Chee Ghuan Tan ◽  
Wei Ting Chia ◽  
Taksiah A. Majid ◽  
Fadzli Mohamed Nazri ◽  
Mohd Irwan Adiyanto
Keyword(s):  
Reinforced Concrete ◽  
Plastic Hinge ◽  
Reinforced Concrete Building ◽  
Soft Storey ◽  
Concrete Building ◽  
Moment Resisting
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