scholarly journals Comparison of Ultimate Capacities of RC Chimney Sections under Wind Loading

2022 ◽  
Vol 19 (1) ◽  
pp. 1722
Author(s):  
Megha Bhatt ◽  
Sandip Vasanwala
Keyword(s):  
Reinforced Concrete ◽  
Comparative Study ◽  
Ultimate Strength ◽  
Limit State ◽  
Design Concept ◽  
Wind Loading ◽  
Stress Strain ◽  
Limit State Design ◽  
Strain Relationship ◽  
Thin Walled

Diffusion of gaseous and particulate pollutants from tall stacks has formed an important element in the control of air pollution since the industrial revolution began. These tall reinforced concrete chimneys are considered to be cantilever columns subjected to axial load resulted from the self-weight of the shell, linings and other accessories and bending moments which are resulted from the lateral loads like wind forces and earthquake forces. The recently published IS: 4998 – 2015 adopted a limit state design concept which requires well defined stress-strain relationship for concrete and steel. It has been seen that there are many disparities lies between the stress-strain relationships of constituent materials adopted by IS: 4998 – 2015 and other design standards. This paper discusses various methods pertaining to the estimation of the ultimate strength of thin-walled hollow circular sections of reinforced concrete chimneys, subjected to wind loading. A comparative study of various methods based on the prevalent codes reveals considerable disparity in the predicted ultimate strength values. These differences have been critically analyzed and results are discussed in this paper in terms of ultimate strength along with the contribution of concrete and steel, ultimate curvature and depth of neutral axis. For the comparison of above-mentioned parameters, design recommendations of IS 4998 – 2015, CICIND 2011, ACI 307 – 08 are used. HIGHLIGHTS The recently published IS: 4998 – 2015 adopted a limit state design concept which requires well defined stress-strain relationship for concrete and steel which differs in terms of strain and stress limits when compared with other well established RC chimney design codes Various methods pertaining to the estimation of the ultimate strength of thin-walled hollow circular sections of reinforced concrete chimneys, subjected to wind loading are discussed using a comparative study with different parameters of RC chimney For the comparison of above-mentioned parameters, design recommendations of IS 4998 – 2015, CICIND 2011, ACI 307 – 08 are used Stress-strain relationship of concrete and steel also discussed with the bases of the same is also discussed in detail for each of the above codes GRAPHICAL ABSTRACT

Structural performance of steel fibre reinforced concrete — Part II. Compressive behaviour and stress-strain relationship

2014 ◽  
Vol 5 (1) ◽  
pp. 21-33
Author(s):  
I. Kovács
Keyword(s):  
Reinforced Concrete ◽  
Steel Fibre ◽  
Fibre Orientation ◽  
Reinforced Concrete Beams ◽  
Fibre Reinforcement ◽  
Fibre Reinforced Concrete ◽  
Stress Strain ◽  
Steel Fibre Reinforced Concrete ◽  
Compressive Behaviour ◽  
Strain Relationship

Abstract The present paper of a series deals with the experimental characterisation of compressive strength and compressive behaviour (stress-strain relationship) of different structural concrete containing different volume of steel fibre reinforcement (0 V%, 0.5V%, 1.0V%, 75 kg/m3, 150 kg/m3) and different configuration of steel fibres (crimped, hooked-end). Compressive tests were carried out on standard cube (150 mm × 150 mm × 150 mm) and cylinder (Ø = 150 mm, l = 300 mm) specimens considering random fibre orientation. Since the fibre orientation may significantly affect the compressive behaviour, test series were also performed on cylinders (Ø = 70 mm, l = 100 mm) drilled out of fibre reinforced concrete beams and prisms (100 mm × 100 mm × 240 mm) sawn out of steel fibre reinforced deep beams. Throughout the tests stress-strain relationships were registered on the standard cube and cylinder specimens as well. In conclusion, behaviour of steel fibre reinforced concrete was examined in compression taking into consideration different experimental parameters such as fibre content, type of fibres, fibre configuration, fibre orientation, size of specimens (size effect) and concrete mixture.

A comparative study on stress-strain response and associated hysteresis for conventional and PET macro-reinforced concrete

2020 ◽  
Vol 264 ◽  
pp. 120534
Author(s):  
Mihir Fadadu ◽  
Nikulkumar Vadher ◽  
Vivekkumar Trivedi ◽  
Mahesh Mungule ◽  
Kannan K.R. Iyer
Keyword(s):  
Reinforced Concrete ◽  
Comparative Study ◽  
Strain Response ◽  
Stress Strain

Thickness of Concrete Cover for Corrosion Protection of Steel Reinforcement and Crack Control

2010 ◽  
Vol 95 ◽  
pp. 61-68 ◽  
Author(s):  
Rina Farhat
Keyword(s):  
Corrosion Protection ◽  
Crack Width ◽  
Limit State ◽  
Concrete Cover ◽  
Steel Reinforcement ◽  
Strain Diagram ◽  
Stress Strain ◽  
Crack Control ◽  
Strain Relationship ◽  
Cover Thickness

Thickness of concrete cover positively affects both the protection of the steel against corrosion and the safe transmission of bond forces. On the other hand it affects Crack control inversely, larger concrete cover causes larger crack width, and as a result it yields reduction in the protection of the steel against corrosion. The influence of the distance between the centroid of the longitudinal reinforcement to the neutral axis, and the stress in the tension steel, on the crack width and Crack control, will be examined. Computations will be done using personal computer program developed for nonlinear analysis of rectangular reinforced concrete sections in flexure. The analysis is performed using Stress-strain relationship for confined concrete: parabola – rectangle with decending branch to 0.3 fc at Ecu, followed by horizontal branch. Stress-strain diagram for reinforcing steel, with an inclined top branch with a strain limit of E su . Beams and slabs elements sections will be examined for the flexural moments from the external loads acting at serviceability limit state. This paper will introduce by computing the concrete fibers stresses and strains over the height of the section, for different element thickness, the influence of tension steel stresses and concrete cover thickness on crack control and corrosion protection of steel reinforcement.

scholarly journals Analysis and Design of Reinforced Concrete Multi-Stored Building (G+5) by using Tekla Software

2021 ◽  
Vol 7 (03) ◽  
pp. 229-244
Keyword(s):  
Reinforced Concrete ◽  
Construction Industry ◽  
Limit State ◽  
Bending Moment ◽  
Wind Loading ◽  
Unit Weight ◽  
Analysis And Design ◽  
Code Of Practice ◽  
Budget Analysis ◽  
Earthquake Load

The rapidly developing world, in construction industry software’s are used today is the urgent necessity of the moment in order to match the peace of infrastructural development. The main objective of the study is checking the computability of results. The analysis and design of Reinforced Concrete structures is a final stage in the construction industry to deliver the projects with in the estimated time and within the budget. Analysis and design tasks is not an easy matter of fact. Especially specialized software’s are used such as Robot structural Analysis, MIDAS Gen, SAP2000, STAAD PRO, ETABS, TEKLA Structural designer, S-Frame and so on. To gain the design results most commonly used software are validated. In manual design process Indian Standard Codes are utilized and different design modules are used to gain the confidence of the users. The basic elements of a RC Structure such as beams, columns and simple frame have been discussed. In analysis process, shear force and bending moment of beams and columns are comparable in all cases. Thereafter the loads are calculated namely the dead loads, which depend on the unit weight of the materials used (concrete, brick), live loads, which according to the code IS 875-1987 and earthquake load according to IS1893 (PART-1). IS 456:2000 code of practice for plain and reinforced concrete and IS 800:2007 limit state design and seismic ductile design IS:13920(2016) and seismic loading IS 1893 (part 1):2016 and wind loading IS875(part 3):1987. Finally, the footings are designed based on loading from the column and the soil bearing capacity for the particular area. Most importantly, the sections must be checked for all the four components with regard to strength and serviceability factors.Construction plays a significant role in the emergence of ecological problems such as environmental pollutions, energy consumption and carbon emission and so on. In the emergence of ecological situations the specific attention has to be devoted and develop the sustainable and green solutions in the design of buildings and structures.

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