Modelling of Mortarless Masonry As an Equivalent Strut Inside Reinforced Concret

2021 ◽  
Vol 1 (2) ◽  
pp. 50-54
Author(s):  
Hakan KOMAN
Keyword(s):  
Equivalent Strut

Monotonic Behaviors of Steel Frames with Sandwich Composite Panel Infills: Theoretical and Numerical

2012 ◽  
Vol 193-194 ◽  
pp. 1424-1428
Author(s):  
Miao Liu ◽  
Yan Fei Sun ◽  
C.X. Qiu ◽  
He Tao Hou
Keyword(s):  
Structural Engineering ◽  
Theoretical Study ◽  
Numerical Models ◽  
Steel Frames ◽  
Composite Panel ◽  
Sandwich Composite ◽  
Actual Structure ◽  
Equivalent Strut ◽  
Cross Section Area ◽  
Section Area

Abstract: Analysis of infilled frames is one of the most complicated problems in the structural engineering field. This complication is mainly attributed to the existence of the variety and complex of the infills and the difficulty in modeling the infill-frames interaction. In the present paper, with the aim to study the integral behavior of the single-story single-bay steel frames with sandwich composite panel infills, a proper computational model (the panel is simplified into an equivalent pin-jointed diagonal strut) is proposed. In the theoretical study, both of the panels and steel frames are assumed to be in the linear elastic state for simplicity’s sake, and then the cross-section area of the equivalent strut is obtained by imposing the initial lateral stiffness of actual structure equal to that of simplified model. As a support of the discussion, several numerical models under monotonic lateral loadings are performed by software ABAQUS, in order to verify the theoretical analysis. Finally, results from theoretical study and numerical modeling are compared, which give a satisfactory correlation between them.

scholarly journals Infill Modelling Influence on Dynamic Identification and Model Updating of Reinforced Concrete Framed Buildings

2020 ◽  
Vol 2020 ◽  
pp. 1-16 ◽  
Author(s):  
Marco Bovo ◽  
Michele Tondi ◽  
Marco Savoia
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Model Updating ◽  
Numerical Models ◽  
Finite Element Models ◽  
Dynamic Tests ◽  
Large Variability ◽  
Equivalent Strut ◽  
Infill Panels ◽  
Wide Range

In order to correctly capture the dynamic behavior of infilled framed buildings, the importance to take into account in seismic design the infill panels’ contribution is nowadays well recognized since they could modify in a significant way the global and local response of the whole building. Despite about sixty years of continuous research in the field, the modelling of the frame-infill interaction still represents a serious issue for the daily practical design since there is no reference model proven to be suitable to cover a wide record of possible cases. Moreover, few works are available in the literature, comparing the results of different modelling proposals with outcomes of dynamic tests on a full-scale building. To this regard, starting from the results of induced vibration dynamic tests performed on a 7-story building with reinforced concrete frames with masonry infill, in the present paper, the effects of the infill presence have been evaluated by comparing experimental outcomes, achieved using a MDOF Circle-Fit identification procedure, with the results obtained by means of numerical analyses performed on finite element models. Using a model updating procedure, the optimal width to assign to the masonry equivalent struts modelling the infill panels was defined. Furthermore, several literature proposals for the definition of the equivalent strut width have been analysed. Thirteen different proposals have been selected and implemented in thirteen different finite element models. The reliability of each proposal has been investigated and quantified by comparing the dynamic properties of the models with the building dynamic response obtained by the experimental tests. The main outcomes of the analyses highlight that different proposals provide a great variability for the strut width. This brings to a large variability of the mechanical properties of the equivalent struts, and as a consequence, the modelling choice also influences the dynamic behaviour of the numerical models. Currently, this represents a serious issue for the daily designers’ activity. The outcomes provided in the paper, although established for a specific case study, can be extended to a wide range of buildings and should drive the future research studies in order to provide more robust criteria for the modelling of this worldwide building class.

Experimental Study of Partially Masonry Infilled Reinforced Concrete Frame under Lateral Loading

2017 ◽  
Vol 21 ◽  
pp. 22-32
Author(s):  
Prachand Man Pradhan ◽  
Ramesh Kumar Maskey ◽  
Prajwal Lal Pradhan
Keyword(s):  
Experimental Study ◽  
Reinforced Concrete ◽  
Failure Modes ◽  
Point Of View ◽  
Lateral Loading ◽  
Experimental Point ◽  
Reinforced Concrete Frame ◽  
Infilled Frames ◽  
Concrete Frame ◽  
Equivalent Strut

The partially infilled frames are considered vulnerable in terms of captive column effect for the events of earthquakes. Many reinforced concrete buildings have been affected due to captive column effects. Experimental study has been done to verify the captive column effect and its failure modes for partially infilled frames and the results have been compared with the ones obtained for a bare frame subjected to lateral loading. The results of experimental study have also been compared with some analytical results and the verification of equivalent strut width proposed by one of the authors has been done. From the experimental point of view, it is understandable that due to lateral loading to partially infilled frames, the damage pattern is diagonal and the failure of column occurs at the column-wall joint at the upper side of the wall. It is also seen that for fifty percent partially infilled frames, the stiffness of bare frame is enhanced slightly, however, the failure in the column during lateral loading indicates that the columns are subjected to high shear due to the presence of partial infill.

Implementation and Verification of a Masonry Infill Model Considering the Out-Of-Plane Behaviour

2013 ◽  
Vol 353-356 ◽  
pp. 1836-1845
Author(s):  
Zhi Xiong Chen ◽  
Ying Hu
Keyword(s):  
Numerical Model ◽  
Inertial Forces ◽  
Plane Failure ◽  
Masonry Infill ◽  
Earthquake Loads ◽  
Equivalent Strut ◽  
Column Type ◽  
Proposed Model ◽  
Out Of Plane ◽  
Plane Direction

The response of reinforced concrete buildings to earthquake loads can be substantially affected by the influence of infill walls. Also the out-of-plane failure of the infill can cause heavy casualties. In this article, an improved numerical model for the simulation of the in-plane and out-of-plane behaviour of masonry infill is proposed. First, the proposed model is presented. This is an upgrading equivalent strut model composed of two beam-column type elements, with a node at the mid-span assigned a mass in the in-plane and the out-of-plane direction to account for the inertial forces in both directions. Second, the main results of the calibration analyses obtained with two experiments are presented and discussed.

scholarly journals Comparison of Modelling Strategies of R.C Walls for Seismic Analysis

2021 ◽  
Vol 1197 (1) ◽  
pp. 012067
Author(s):  
Syed Hamim Jeelani ◽  
Salim Akhtar ◽  
N Lingeshwaran ◽  
Durga Chaitanya Kumar Jagarapu ◽  
M A Mohammed Aslam ◽  
...  
Keyword(s):  
Seismic Analysis ◽  
Response Spectrum ◽  
Time History ◽  
Shell Element ◽  
Point Of View ◽  
Element Discretization ◽  
Shell Elements ◽  
Design Engineers ◽  
Equivalent Strut ◽  
Modelling Strategies

Abstract Reinforced concrete walls are being widely adopted as lateral load resisting systems for high rise structures. The current practice among design engineers for modelling of such walls is by idealizing the same as ‘wide’ columns, which is uncertain from safety as well as economy point of view. The most efficient modelling strategy of RC walls involves use of shell elements. Such an approach can be computationally much intensive, especially from a seismic analysis perspective. The present study utilizes an equivalent strut approach for modelling RC walls. The modelling strategy is demonstrated on a G + 15 storey residential apartment located in Calicut city. The proposed methodology will be compared with the traditional ‘wide’ column method as well as the one with shell element discretization. Comparison of modal properties such as frequencies and vibration modes from the various models are initially made to assess the model accuracy. Various seismic analyses viz. Equivalent static approach, Response spectrum approach and the assessment the storey shear, inter storey drifts as well as computation times using various models were performed using time history analysis. From preliminary results, it is understood that the modelling strategy could serve as an efficient alternative to more robust and computationally demanding scheme involving use of shell elements.

scholarly journals Numerical Analysis of Masonry Assemblages through Simplified Micro-Modeling

2020 ◽  
Vol 20 (6) ◽  
pp. 7-13
Author(s):  
Dong-Jin Yoon ◽  
Kwang-Mo Lim ◽  
Joo-Ha Lee
Keyword(s):  
Performance Evaluation ◽  
Masonry Wall ◽  
Nonlinear Static Analysis ◽  
Analysis Method ◽  
Equivalent Strut ◽  
Reinforced Masonry ◽  
Micro Modeling ◽  
Nonlinear Static ◽  
Evaluation Techniques ◽  
Significant Attention

Recently, research focused on preventing the aging of masonry structures, and minimization of damage caused by earthquakes to these structures has gained significant attention. To improve the performance of these structures, an appropriate method is required for their performance evaluation. Generally, the equivalent strut model is employed for the performance evaluation of a masonry wall. However, this method is known to have limitations in implementing reinforced masonry and in reflecting the actual reinforcement effect. Appropriate evaluation techniques should be developed to implement the performance improvement methods developed in the future. Therefore, in this study, analysis methods were developed considering the nonlinear static analysis method for masonry elements. In addition, using these methods, the analysis considering the various reinforced thicknesses and shapes was performed, and the appropriate reinforcement methods were presented for these structures.

scholarly journals EQUIVALENT STRUT WIDTH FOR MODELING R.C. INFILLED FRAMES

2013 ◽  
Vol 41 (3) ◽  
pp. 851-866 ◽  
Author(s):  
K. H. Abdelkareem ◽  
F. K. Abdel Sayed ◽  
M. H. Ahmed ◽  
N. AL-Mekhlafy
Keyword(s):  
Infilled Frames ◽  
Equivalent Strut

Local stability of concrete arch bridge based on Ritz method

2021 ◽  
pp. 1-16
Author(s):  
Jiansheng Tong ◽  
Zhengyuan Lin ◽  
Qian Zhou
Keyword(s):  
Ritz Method ◽  
Local Buckling ◽  
New Method ◽  
Radius Of Gyration ◽  
Limit Values ◽  
Arch Bridge ◽  
Finite Element Software ◽  
Equivalent Strut ◽  
Thin Walled ◽  
Arch Bridges

In order to minimize the self-weight and prevent local buckling failure of thin-walled box concrete arch bridges at the same time, the limit values of width-thickness ratios are deduced based on Ritz method and equivalent strut theory of arch bridge. A new method of determining sectional forms based on the limit values of width-thickness ratios is put forward. Based on Mupeng bridge, the theoretical results are verified by finite element software ANSYS. Results show that the limits of width-thickness ratios are related to concrete grade, equivalent calculation length and radius of gyration, the allowable minimum thickness of Mupeng bridge is 15 cm to avoid local buckling. The limit values of width-thickness ratios deduced in this paper are reasonable and this new method of determining sectional forms is simple and rational to apply in engineering. A scientific engineering calculation method on arch ring design is put forward and it can provide a theoretical basis for the design of thin-walled box concrete arch bridges constructed by cantilever pouring.

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