Static and dynamic analysis of a reinforced concrete flat slab frame building for progressive collapse

2012 ◽  
Vol 40 ◽  
pp. 205-217 ◽  
Author(s):  
Seweryn Kokot ◽  
Armelle Anthoine ◽  
Paolo Negro ◽  
George Solomos
Keyword(s):  
Reinforced Concrete ◽  
Dynamic Analysis ◽  
Progressive Collapse ◽  
Flat Slab ◽  
Static And Dynamic Analysis ◽  
Frame Building

scholarly journals Numerical modeling of reinforced concrete structures: static and dynamic analysis

2013 ◽  
Vol 66 (4) ◽  
pp. 425-430 ◽  
Author(s):  
Jorge Luis Palomino Tamayo ◽  
Armando Miguel Awruch ◽  
Inácio Benvegnu Morsch
Keyword(s):  
Reinforced Concrete ◽  
Numerical Model ◽  
Finite Elements ◽  
Dynamic Analysis ◽  
Time Integration ◽  
Great Accuracy ◽  
Constitutive Law ◽  
Published Data ◽  
Static And Dynamic Analysis ◽  
Plates And Shells

A numerical model using the Finite Element Method (FEM) for the nonlinear static and dynamic analysis of reinforced concrete (RC) beams, plates and shells is presented in this work. For this purpose, computer programs based on plasticity theory and with crack monitoring capabilities are developed. The static analysis of RC shells up to failure load is carried out using 9-node degenerated shell finite elements while 20-node brick finite elements are used for dynamic applications. The elasto-plastic constitutive law for concrete is coupled with a strain-rate sensitive model in order to take into account high loading rate effect when transient loading is intended. The implicit Newmark scheme with predictor and corrector phases is used for time integration of the nonlinear system of equations. In both cases, the steel reinforcement is considered to be smeared and represented by membrane finite elements. Various benchmark examples are solved with the present numerical model and comparisons with other published data are performed. For all examples, the path failure, collapse loads and failure mechanism is reproduced with great accuracy.

scholarly journals Nonlinear behaviour of reinforced concrete flat slabs after a column loss event

2018 ◽  
Vol 21 (14) ◽  
pp. 2169-2183 ◽  
Author(s):  
Justin M Russell ◽  
John S Owen ◽  
Iman Hajirasouliha
Keyword(s):  
Reinforced Concrete ◽  
Shear Failure ◽  
Progressive Collapse ◽  
Nonlinear Behaviour ◽  
Dynamic Amplification Factor ◽  
Element Analysis ◽  
Flat Slab ◽  
Standard Design ◽  
Loss Event ◽  
Dynamic Amplification

Previous studies have demonstrated that reinforced concrete flat slab structures could be vulnerable to progressive collapse. Although such events are dynamic, simplified static analyses using the sudden column loss scenario are often used to gain an indication into the robustness of the structure. In this study, finite element analysis is used to replicate column loss scenarios on a range of reinforced concrete flat slab floor models. The model was validated against the results of scaled-slab experiments and then used to investigate the influence of different geometric and material variables, within standard design ranges, on the response of the structure. The results demonstrate that slab elements are able to effectively redistribute loading after a column loss event and therefore prevent a progressive collapse. However, the shear forces to the remaining columns were 159% of their fully supported condition and increased to 300% when a dynamic amplification factor of 2.0 was applied. It is shown that this can potentially lead to a punching shear failure in some of the slab elements.

scholarly journals Static and dynamic analysis of reinforced concrete shells

2013 ◽  
Vol 10 (6) ◽  
pp. 1109-1134 ◽  
Author(s):  
Jorge L. P. Tamayo ◽  
Inácio B. Morsch ◽  
Armando M. Awruch
Keyword(s):  
Reinforced Concrete ◽  
Dynamic Analysis ◽  
Static And Dynamic Analysis ◽  
Concrete Shells

scholarly journals Progressive Collapse Analysis of Reinforced Concrete Structures: A Simplified Procedure

2017 ◽  
Vol 2 (10) ◽  
pp. 7 ◽  
Author(s):  
Arash Naji ◽  
Mohamadreza Rohani
Keyword(s):  
Reinforced Concrete ◽  
Dynamic Analysis ◽  
Static Analysis ◽  
Progressive Collapse ◽  
Concrete Structures ◽  
Nonlinear Static Analysis ◽  
Reinforced Concrete Structures ◽  
Collapse Analysis ◽  
Nonlinear Static ◽  
Progressive Collapse Analysis

In this paper, a simplified analysis procedure to calculate the column removed point displacement at progressive collapse analysis of reinforced concrete structures is proposed. The energy absorption capacity under the column missing event is used for formulations. The approximate method is simple to utilize, user friendly, yet accurate. For progressive collapse analysis of structures, linear static analysis, nonlinear static analysis, linear dynamic analysis and nonlinear dynamic analysis can be performed. In this paper, the nonlinear static analysis from alternate load path method is used and the reason of initial local collapse has not been considered. In fact, an energy-based method by using load-displacement curve of RC frame and considering the effect of floor slab for the progressive collapse analysis is considered. The accuracy of the proposed method is demonstrated by comparing the results to three experimental and analytical results. Finally, the effects of the spans length, sections dimensions, material properties and the beams reinforcements of column removed spans on substructure behavior is studied, as well.

scholarly journals DETERMINATION OF RELIABILITY OF OPERATION OF MULTI-STOREY FRAME BUILDING AT DIFFERENT VARIANTS OF COLUMN REINFORCEMENT

2020 ◽  
Vol 3 (156) ◽  
pp. 121-125
Author(s):  
O. Shapovalov ◽  
S. Potapov
Keyword(s):  
Reinforced Concrete ◽  
Progressive Collapse ◽  
Residential Building ◽  
Emergency Situation ◽  
The Third ◽  
Reliability Indicators ◽  
Reliability Parameters ◽  
Frame Building ◽  
Actual Design ◽  
Reliability Of Operation

The article considers the issues of variant design of bearing elements of monolithic reinforced concrete crossbarless frame. In particular, the columns, in order to ensure increased reliability of operation of the frame in cases of exposure to various adverse conditions. Such conditions include factors of disproportionate destruction (progressive collapse), which can significantly damage the building. With variant reinforcement of columns, it is possible to achieve a state when the reliability of safe operation of the building will be most pronounced, which may be a recommended measure in the design of multi-storey buildings. It is noted that a rational increase in the reinforcement of columns on the lower floors leads to an increase in the parameter of trouble-free operation of the entire building in emergencies, and this is a sign of increasing the reliability of the entire designed frame of the building. The technology of estimating the reliability parameters is that along the height of the column there are four to five sections with a certain percentage of reinforcement, the maximum percentage (up to 2% -3.5%) is located in the lower zone of the columns, and the smallest % -1.0%) at the top of the columns. This armature is appointed proceeding from statistical calculation of a skeleton and the received internal efforts of M, N, V. In the resulted article as the device of calculation of a 14-storeyed with a cellar of a inhabited frame building the software and computer complex "SCAD" version 21.1.9.5 is used. The emergency situation is predicted in the form of an explosion in the basement of a residential building, which led to the destruction of three columns of the corner of the building and one stiffness diaphragm. Five possible options for column reinforcement were compared (there are 585 columns in the frame of the building). In the first and second embodiments, the reinforcement of the lower two zones was ϻ = 1.57%, the upper two zones ϻ = 0.5%, in the third variant, the reinforcement of the lower two zones was ϻ = 2.57%. In the fourth and fifth variants, the lower two zones had reinforcement ϻ = 1.0%, the upper two zones ϻ = 1.57%. In each of the variants the strength of the concrete changed: for the I and IV variants it corresponded to class C20 / 25; for II, III and V variants the concrete class corresponded to C32 / 40. The parameter of failure-free operation P (t) for the frame in each case was determined by the method of Kudzis AP The calculations showed that the values of P (t) for each option were: I - 0,978; II - 0.986; III - 0.998; IV - 0.969; V - 0.983. Thus, the most effective was the third option (maximum reinforcement of the lower tiers of the columns), which is recommended for implementation in the actual design. Keywords: disproportionate destruction, reliability and safety of operation, reliability indicators, reinforced concrete monolithic framework, variant reinforcement, efficiency of the accepted decisions.

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