Internal Force and Deflection Calculation of a Kind of Cellular Hollow Flat Slab Floor

2011 ◽  
Vol 94-96 ◽  
pp. 67-72
Author(s):  
Jin Sheng Han ◽  
Shu Ping Cong
Keyword(s):  
Internal Force ◽  
Thin Wall ◽  
Structural Form ◽  
Flat Slab ◽  
Flat Slabs ◽  
Calculation Results ◽  
Equivalent Frame ◽  
Frame Method

The structural form of a kind of cellular hollow flat slab floor using thin wall plastic boxes was introduced. The equivalent frame method, which was used to analyze the internal force of this kind of cellular hollow flat slab floor, was discussed. Finally, the method to calculate the deflection of cellular hollow flat slab was investigated and some improvements in this method were presented. The effects of the cracks on the stiffness and deflection of hollow flat slabs were taken into account in this method to decrease the error of elasticity calculation results.

scholarly journals Effect of load balancing on punching shear stress and deflection of post tensioning flat slab with different grade of concrete

2018 ◽  
Vol 7 (3.29) ◽  
pp. 157
Author(s):  
Kamal Padhiar ◽  
Dr C. D. Modhera ◽  
Dr A. K. Desai ◽  
Dr S. A. Vasanwala
Keyword(s):  
Shear Stress ◽  
Load Balancing ◽  
Load Balance ◽  
Punching Shear ◽  
Flat Slab ◽  
Flat Slabs ◽  
Equivalent Frame ◽  
Frame Method ◽  
Post Tensioning

Flat slabs are a widely adopted solution now a day for buildings, because of their economic and functional advantages. The main objective of this paper is to analysis of post tensioning flat slab by changing the different parameter such as span of slab, grade of concrete and load balancing and comparing the result such as deflection and punching shear. Grade of concrete and load balance directly influence to the deflection and punching shear of flat slab. So in this paper concrete grade varies M-35 to M-50 is considered and load balance varies from minimum 25% to maximum 100% is considered. The use of ADAPT-PT builder 2015 is recommended because of its friendly use and quick calculation capabilities. Use of the ACI Code equivalent frame method of analysis was performed using said software.  

On Bending of a Flat Slab Supported by Square-Shaped Columns and Clamped

1954 ◽  
Vol 21 (3) ◽  
pp. 263-270
Author(s):  
S. Woinowsky-Krieger
Keyword(s):  
Stress Distribution ◽  
Conformal Mapping ◽  
Complex Variable ◽  
Complex Variable Method ◽  
Variable Method ◽  
Flat Slab ◽  
Flat Slabs ◽  
At Will

Abstract A solution is given in this paper for the problem of bending of an infinite flat slab loaded uniformly and rigidly clamped in square-shaped columns arranged to form the square panels of the slab. The complex variable method in connection with conformal mapping is used for this aim. Although not perfectly rigorous, the solution obtained is sufficiently accurate for practical purposes and, besides, it can be improved at will. Stress diagrams traced in a particular case of column dimensions do not wholly confirm the stress distribution, generally accepted in design of flat slabs.

Punching Analysis of a Flat Slab with a Change in Elevation

2015 ◽  
Vol 1106 ◽  
pp. 233-236
Author(s):  
Jan Nováček ◽  
Miloš Zich
Keyword(s):  
Nonlinear Model ◽  
Linear Models ◽  
Flat Slab ◽  
Flat Slabs

In recent years, construction of buildings with concrete flat slabs has developed widely. For these structures, correct punching design is crucial. Suitable punching check methods for most common details are provided in all standards. In some cases, however, it is necessary to use a detail that is not fully covered in effective codes. In the article, the change in elevation at a column line detail of a flat slab is analysed. Attention is paid to possible ways of inner forces interpretation and to their subsequent check in accordance with standards. Several linear models and one nonlinear model were created and compared against each other.

Microcomputer analysis of reinforced concrete slab systems

1993 ◽  
Vol 20 (4) ◽  
pp. 587-601 ◽  
Author(s):  
Pierre Léger ◽  
Patrick Paultre
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Structural Design ◽  
Concrete Slab ◽  
Three Dimensional ◽  
Structural Behaviour ◽  
Reinforced Concrete Slab ◽  
Element Analysis ◽  
Equivalent Frame ◽  
Frame Method

Microcomputer finite element analysis of reinforced concrete slab systems can now be routinely performed to produce realistic numerical simulation of three-dimensional structural behaviour. However, an efficient use of this approach requires an automated integration of design and analysis procedures. Guidelines for proper finite element modelling of slab systems are first presented along with simple post-processing algorithms to perform automatically the design or verifications from the analytical results. Numerical applications on simple slab systems subjected to uniform and concentrated loads are then used to illustrate the relative performance between finite element analyses and the equivalent frame method. Key words: microcomputer, reinforced concrete slab, finite element method, structural design.

Reconstruction Effectiveness of Locally Supported Flat Slabs to Increase in Shear Resistance

2020 ◽  
Vol 309 ◽  
pp. 246-251
Author(s):  
Mária Bolešová ◽  
Katarína Gajdošová ◽  
Marek Čuhák
Keyword(s):  
Shear Stress ◽  
Numerical Models ◽  
Shear Resistance ◽  
Reconstruction Method ◽  
Detailed Calculation ◽  
Shear Reinforcement ◽  
Flat Slab ◽  
Advantages And Disadvantages ◽  
Flat Slabs ◽  
Eurocode 2

The most used horizontal load-bearing systems in concrete buildings are flat slabs. The effective and economic reconstruction of a locally supported flat slab of an existing building creates a complex task. Shear stress arises near the column and it becomes critical in design with increasing slab slenderness and requires a more detailed calculation. Increasing in the shear resistance of the flat slab can be achieved in various ways. Each method brings different effectiveness, advantages and disadvantages. The most widely used methods of the reconstruction are the increase in the size of the column (therein increasing the control perimeter for displaying the shear stress), the increase in the thickness of the flat slab or reinforcing the slab with shear reinforcement. Bolts and screw anchors (using different mounting angles) can be used as shear reinforcement. Each mentioned reconstruction method should be subjected to numerical calculations and verification of its efficiency. The parametric study presented in this paper is focused on the reconstruction techniques and their verification according to various numerical models. The results from Eurocode 2, fib Model Code 2010 and the new generation of Eurocode 2 are compared to show the differences between them. The aim of this paper is to bring a demonstration of the reconstruction methods that will increase in the shear resistance of the locally supported flat slabs and trying to choose the most effective one.

Comparative Analysis of the Influence of Different Construction Technology for Excavation on Adjacent Tunnels

2014 ◽  
Vol 638-640 ◽  
pp. 884-887
Author(s):  
Yong Gang Du ◽  
Jing Cao ◽  
Zu De Ding
Keyword(s):  
Lateral Displacement ◽  
Internal Force ◽  
Calculation Model ◽  
Construction Technology ◽  
Tunnel Structure ◽  
Lateral Deformation ◽  
Foundation Pit ◽  
Engineering Construction ◽  
Excavation Process ◽  
Calculation Results

Based on the project of a foundation pit engineering adjacent to existing tunnel of Kunming metro line 1, a 3D calculation model is established in consideration the interaction of foundation pit support structures, tunnel structure and soil. In this paper, the authors have simulated the foundation pit excavation process in three conditions, and analyzed the changing laws of the lateral displacement and internal force of the tunnel induced by adjacent excavation under different conditions. Calculation results show that the distributions and the values of the displacement and internal force of the tunnel are obviously different under three different construction technologies, and the “jump dig” is the optimum excavation scheme due to the restriction in the excavation of foundation pit, and the lateral deformation of tunnel structure is smallest in this condition. The conclusion can provide a theoretical basis for similar excavation engineering construction.

Unified equivalent frame method for flat plate slab structures under combined gravity and lateral loads - Part 2: verification

2014 ◽  
Vol 7 (5) ◽  
pp. 735-751 ◽  
Author(s):  
Seung-Ho Choi ◽  
Deuck Hang Lee ◽  
Jae-Yuel Oh ◽  
Kang Su Kim ◽  
Jae-Yeon Lee ◽  
...  
Keyword(s):  
Flat Plate ◽  
Lateral Loads ◽  
Equivalent Frame ◽  
Frame Method

Unified equivalent frame method for flat plate slab structures under combined gravity and lateral loads - Part 1: derivation

2014 ◽  
Vol 7 (5) ◽  
pp. 719-733 ◽  
Author(s):  
Kang Su Kim ◽  
Seung-Ho Choi ◽  
Hyunjin Ju ◽  
Deuck Hang Lee ◽  
Jae-Yeon Lee ◽  
...  
Keyword(s):  
Flat Plate ◽  
Lateral Loads ◽  
Equivalent Frame ◽  
Frame Method

The Calculation of Landslide-Thrust Based on Reliability Theory

2012 ◽  
Vol 226-228 ◽  
pp. 1293-1296 ◽  
Author(s):  
Ying Xiang Wu ◽  
Dong Sheng Liu ◽  
Lei Wang ◽  
Qian Xin
Keyword(s):  
Failure Surface ◽  
Internal Force ◽  
Reliability Theory ◽  
Retaining Structure ◽  
Distribution Form ◽  
Thrust Distribution ◽  
Calculation Results ◽  
Combined Action ◽  
Current Engineering

For current engineering of anti-slide piles, many problems exist in the calculation of landslide-thrust. Therefore, a new method based on the reliability theory combined with strength reduction FEM is introduced, and the landslide-thrust acting on anti-slide pile is researched here. In this method, the safety factor of slope can be caculated without assuming the shape and position of failure surface beforehand, the randomness of physical and mechanical parameters of slope are introduced, and the combined action of retaining structure and rock mass is considered. Meanwhile, the thrust distribution form and structural internal force can be calculated, which are also probabilistic. A case study shows that the calculation results are more reasonable and the applicability of proposed method is clearly dependable in calculating the landslide thrust.

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