software module for rcc column design

Software Module for Design of Rectangular and Non-Rectangular RCC Columns

PRESENTED BY : RUTVIK SHETH

GUIDED BY :Dr. M. A. PATEL

DEPARTMENT OF CIVIL ENGINEERINGDHARMSINH DESAI INSTITUTE OF TECHNOLOGY

NADIADAPRIL 2012

Introduction and Scope of work Review of Existing Software

PI-Design Prokon CSI COL

RCC Columns Design Basis Formulation

Sample Problems and Applications

Contents


• Columns are most important members of Reinforced Concrete Structures having different cross sectional shapes.

• They are classified on the basis of their length, lateral dimensions, support condition and nature of loading.

• Aim of the dissertation is to prepare a SOFTWARE MODULE FOR DESIGN OF RECTANGULAR AND NON-RECTANGULAR RCC COLUMNS subjected to Axial Force and Biaxial Bending Moments as per IS Codes

• Module supports a user friendly input of required data and an impressive graphical output of calculated data.


Introduction

• To prepare a software module for design (capacity calc.) of rectangular and non-rectangular shapes RCC Short Columns (incl. L, C, +, T)

• To identify software requirements and prepare the formulation

• To design front-end and do the implementation of module using Microsoft Visual C++ 2010

• Testing of software and verification by comparing its results with the standards solution available in references

• To design the Security system with the help of hardware locking system (Safe-Net Systems)


Scope of Work

• Design of RCC Column subjected to Axial Force and Biaxial Bending Moments is an iterative task which is tedious and time consuming if done manually which can be used for Rectangular shape only and with Symmetric Rebar Arrangements only

• Present Design methodology in India is based on use of Interaction Charts given in Handbook of Reinforced Concrete Design

• Software packages are available for design of rectangular and non-rectangular based on international codes but very few are based on IS code


Background for Dissertation

• PI – Design

• Prokon Structural Analysis & Design

• CSI COL


Review of Existing Software

• Pi–Design is a software package for advanced analysis and design of reinforced concrete elements (columns, beams, slabs) subjected to axial forces (N) and axial or biaxial (Mx and My) bending moments.

• It includes following Column sections : Rectangular, L-shaped, Z-shaped, T-shaped, Circular, Quadrilateral, -shaped Π

• It supports a user friendly graphical input of required data and an impressive graphical output of calculated data.


PI - Design : Introduction

Design codes

•EC2 (Eurocodes)

•EKOS 2000 (Greek regulations)

•German DIN 1045 (nominal Bn και ΒSt)

Materials

•Concrete from C12 to C90

•All steel qualities

• All calculated data are adequately organized in table format, ready to be printed. All diagrams are visualized both in 2D and 3D for a better clarification and presentation. Software Module for Design of Rectangular and Non-Rectangular RCC Columns

PI - Design : Specification


PI - Design : User Interface

PROKON Structural Analysis and Design is a useful tool for solving everyday building design problems

The concrete Column Design modules are suitable for the design of the following column types:

• Rectangular Column Design, RecCol: Solid rectangular columns of which the larger column dimension does not exceed four times the smaller dimension.

• Circular Column Design, CirCol: Solid circular columns where the simplified design approach applicable to rectangular columns may be applied.

• General Column Design, GenCol: Columns of any general shape and columns with openings.


Prokon : Introduction

• All column design modules can design reinforced concrete

columns subjected to axial load and bi-axial bending

• Bending schedules can be generated for editing and printing

• Code of Practice supported:• ACI 318 - 1993.• BS 8110 - 1987.• BS 8110 - 1997.• CSA-A23.3 - 1994.• Eurocode 2 -1992.• SABS 0100 - 1992.• IS-456 : 2000

Software Module for Design of Rectangular and Non-Rectangular RCC Columns 11

Prokon : Specification


Prokon : Input Form


Prokon : Design Chart

• CSICOL is a comprehensive software package for analyzing and designing reinforced concrete, and reinforced concrete composite columns of all shapes.

• Software designs the column and perform the check in

accordance with the specifications of the selected design code

• Generate capacity interaction surfaces and diagrams

• Code of Practice supported:• ACI 318 - 1993.• BS 8110 - 1997.• IS 456 - 2000• Eurocode 2 -1992.


CSI COL : Introduction


CSI COL : User Interface

• Pu = (0.446* fck*Ac) + (0.87* fy*Asc) for fy = 250



For axially loaded column, εmax = 0.002

When eccentricity ≤ 0.05D or 0.05B

Pu= Puc + Pus

Pu = (0.4* fck*Ac) + (0.67* fy*Asc)


Column Design BasicsAxial Load Capacity:

When the Column is subjected to axial load with biaxial bending, such columns are designed by the following equation.

+

αn is related to Pu/Puz.

where, Puz = ( 0.45*fck*Ac) + (0.75*fy*Asc)


Column Design BasicsColumn Subjected to Axial Load with Biaxial Bending:

Formulation for L – ColumnFor Axial Load + Uniaxial Bending

1) Highly Compressed Edge at Flange Portion (Moment is –ve)

Neutral Axis Lies Outside The Section

Neutral Axis Lies Inside The Section

2) Highly Compressed Edge at Web Portion (Moment is +ve)

Neutral Axis Lies Outside The Section

Neutral Axis Lies Inside The Section

a) D > D1 :

Neutral Axis Lies Outside the Section

𝑋 1=0.5∗𝐷1𝑋 2=( 37 𝐷−𝐷1

2 )+𝐷1

𝑋 3=𝑘𝐷− 𝐴 𝑋 3/𝑃𝑢3

𝑀𝑢=𝑃𝑢1(𝐷2 −𝑋 1)+𝑃𝑢2(𝐷2 − 𝑋 2)+𝑃𝑢 3(𝐷2 −𝑋 3)+∑𝑖=1

𝑛 𝑃𝑖∗ 𝐴𝑔

100∗ (𝐹 𝑠𝑖−𝐹𝑐𝑖 )∗𝑌 𝑖

b) D < D1 :

Neutral Axis Lies Outside the Section

𝑃𝑢1=0.446∗𝐹𝑐𝑘∗37𝐷∗𝐵

𝑋 1=

37𝐷

2

𝑋 2=𝑘𝐷−𝐴 𝑋 2/𝑃𝑢 2


Neutral Axis Lies Inside the Section

a) Xu > D1 :

𝑃𝑢1=0.446∗𝐹𝑐𝑘∗𝐵∗𝐷1

𝑋 1=0.5∗𝐷1

𝑃𝑢2=0.446∗𝐹𝑐𝑘∗( 37 𝑋𝑢−𝐷1)∗𝐵1

𝑋 2=( 37 𝑋𝑢−𝐷1

2 )+𝐷1



b) Xu < D1 :

𝑃𝑢1=0.446∗𝐹𝑐𝑘∗37𝑋𝑢∗𝐵

𝑋 1=

37𝑋𝑢

2




c) Xu < D1 :

𝑃𝑢1=0.446∗𝐹𝑐𝑘∗37𝑋𝑢∗𝐵

𝑋 1=

37𝑋𝑢

2



Description of the Program• Program contains separate modules for different column shapes

• Input Geometrical and Reinforcement data

• Input Pu, Mux and Muy for all load combinations

• Click ‘Check’ button. This will prepare interaction diagram for Pu-Mux and Pu-Muy.

• Program will read the Muxl and Muyl values from interaction diagram corresponding to given axial load Pu.

• Inequality ratio is calculated based on moment capacities obtained

• It checks the criteria of minimum and maximum percentage of

steel, axial load carrying capacity of the section and spacing of

reinforcement

Reference Book: SP-16, Example-8, Pg.105

B = 400 mm fck = 15 MPa

D = 600 mm fy = 415 MPa

Pu = 1600 kN

Mux = 120 kNm Muy = 90 kNm

Solution:

SP-16 :

Pt = 1.27%, Muxl = 205.2 kNm and Muyl =122.4 kNm

By using program:

Pt = 1.27%, Muxl = 218.3 kNm and Muyl =135.4 kNm

Inequality ratio is 0.85


Sample ProblemsProblem:- 1 (Rectangular Column)

Reference Book: Handbook of Reinforced Concrete Design

By S. N. Sinha. (Example 5.8, Pg.257)

B = 1000 mm B1 = 250 mm

D = 1000 mm D1 = 250 mm

fck = 25 MPa fy = 415 MPa

Pu = 4000 kN

Mux = -1390 kNm Muy = -1390 kNm

Solution:

By using the interaction curve, Pt = 3.40% is required for the safe design.

By using program, Pt = 3.38% for the same data and reinforcement pattern


Sample ProblemsProblem:- 2 (L-Shape Column)

Notations



By S. N. Sinha. (Example 5.9, Pg.315)

B = 1000 mm B1 = 250 mm

D = 1000 mm D1 = 250 mm


Pu = 4000 kN

Mux = -1390 kNm Muy = 750 kNm

Solution:

By using the interaction curve, Pt = 3.84% is required for the safe design.

By using program, Pt = 3.52% for the same data and reinforcement pattern


Sample ProblemsProblem:- 3 (T-Shape Column)



By S. N. Sinha.

B = 800 mm B1 = 200 mm

D = 800 mm D1 = 200 mm


Pu = 2240 kN

Pt = 2.80%

Solution:

By Using interaction curves, values of Muxl =Muyl =473 kNm.

By using program, we get Muxl = Muyl = 480.54 kNm for the same data and reinforcement pattern.


Sample ProblemsProblem:- 4 (Plus-Shape Column)


Illustrative Problem

B = 800 mm B1 = 200 mm

D = 800 mm D1 = 200 mm


Pu = 4000 kN

Mux = 750 kNm Muy = -750 kNm

Solution:

By using program, Pt = 2.36%


Sample ProblemsProblem:- 5 (C-Shape Column)

• Safe Net systems provide Sentinel HASP HL hardware based

protection and licensing component.

• Sentinel HASP HL comes in USB Card form factors that protect

software against piracy and illegal copying by allowing access and

execution of the protected software only when the key is

connected to the computer.

• This system is being used by well known softwares like STRUDS

and STRAP for security purpose.

• Cost per dongle ranges from Rs.600 to 2000 based on the size of

software and its platform. For this module, the purchased dongle

costs Rs 650Software Module for Design of Rectangular and Non-Rectangular RCC Columns

Security System

• Ivor Horton, Beginning Visual C++ 2010, Wiley Publication Inc.,2010

• Infosys Campus Connect Generic Courseware

• Sinha S.N., Handbook of Reinforced Concrete Design, Tata McGraw - Hill,

2004.

• Variyani U.H. and Radhaji A., Design Aids for Limit State Design of

Reinforced Concrete Members, Khanna Publishers, 2001.

• Special Publication SP: 16, Design Aids (for reinforced concrete) to IS

456: 1978, Bureau of Indian standard, New Delhi, 1980

• IS 456:2000, Indian Standard Plain and Reinforced Code of Practice

(Fourth Revision), Bureau of Indian Standard

• Unnikrishna Pillai and Devdas Menon, Reinforced Concrete Design,

Second edition, Tata McGraw - Hill, 2003.Software Module for Design of Rectangular and Non-Rectangular RCC Columns

References

THANK YOU

software module for rcc column design

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