Finite Element Analysis and Design of Post-Tensioned ... · Finite Element Analysis and Design of Post-Tensioned Transfer Girder ... Construction stage analysis in structure is important

IJSRD - International Journal for Scientific Research & Development| Vol. 5, Issue 03, 2017 | ISSN (online): 2321-0613

All rights reserved by www.ijsrd.com 685

Finite Element Analysis and Design of Post-Tensioned Transfer Girder Desai Ajaykumar J1 Nihil Sorathia2 Hiren G. Desai3

1PG Student 2Assistant Professor 3Structural Consultant 2Department of Civil Engineering

1,2Parul University, Vadodara 3Sai Consultant, Surat

Abstract— A Post-Tensioned Transfer Girder is utilized to

transfer point load of column from the above stories and

transfer them to the supporting column. Transfer girder gives

great engineering stylish view to the tall structure. Behavior

and design of transfer girder is extremely unusual contrast

with ordinary beam, so it is important to concentrate the

behavior and design of the transfer girder in detail. To

understand the same in the present review, G+10 story

building is basically modeled in which the columns are float

at various levels. The analysis and design of transfer girder

considering dynamic loading i.e. seismic load is done in

ADAPT Builder. Five unique cases are considered with the

end goal of examining the behavior of transfer girder. The

behavior of transfer girder is contemplated by considering the

adjustment in the position of transfer girder in working in

plan and the different location of shear wall. The five

fundamentally unique building is displayed in ETABS and

behavior of the transfer girder is examined. The entire

behavior of the post-tensioned transfer girder is contemplated

by doing construction stage analysis in ETABS. Additionally

the construction stage analysis is done for every one of the

five cases in ETABS. To the extent analysis is concerned, the

column is regularly accepted pinned at the base and is

consequently taken as a point load on the transfer girder.

Additionally the impact of transfer girder on the above

structure is concentrated under gravity and lateral load. The

final design of the transfer girder will done in ADAPT

Builder.

Key words: Post-tensioned, Floating Column, Seismic,

ADAPT Builder

I. INTRODUCTION

In tall building column is stopped at ground and first floor

level to encourage bigger opening at ground level to make get

to agreeable to people in general zone at the base. In 1950's

and 1960's, some Europe researchers proposed the soft base

level to achieve the substantial openings at the base level. A

frame is constructed at base level to support the upper

structure in this kind of structure. It is viewed as that this kind

of structure has better performance during earthquake,

however as indicated by the present encounters, it has been

demonstrated that the idea isn't right. In 1978, numerous this

kind of building fell during the Romania quake.

A column should be a vertical part beginning from

foundation level and exchanging the load to the ground. The

term floating column is additionally a vertical component

which closes at lower level (end level) of the building because

of structural prerequisite and its lay on beam. The beams

thusly exchange the load to different columns below it.

Practically speaking, the genuine columns below the end

level [usually the stilt level] are not constructed with care and

more at risk to disappointment.

These days bigger opening at the ground floor level

is accomplished by utilization of transfer girder to collect the

vertical and parallel load from the elevated structure part and

then distribute them to the broadly separated column.

However in the analysis of the transfer girder, thought of the

impact of intelligent drive in the general examination is past

the scope of the advancement of straightforward and

approximate and requires appropriate modeling in mind the

end goal to have greater understanding the structural behavior

and analysis.

II. MODELLING

A. Problem Definition

For the purpose of understanding behaviour and design of

Post-tensioned transfer girder ETABS 2016 software is

utilized. In order to get correct result from the software the

correct modelling of structure must be required. To validate

the present work with software, following problem of book is

taken in order to compare the analysis result given by

software with the analytical result.

B. Different models

Fig. 1: Configuration for case-1


Finite Element Analysis and Design of Post-Tensioned Transfer Girder

(IJSRD/Vol. 5/Issue 03/2017/179)





Grade of Concrete Fck = 25 N/mm²

Grade of Steel Fy = 500 N/mm²

Density of Concrete 𝛾c = 25 kN/m³

Density of Brick wall 𝛾 = 20 kN/m³

Table 1: Material Specifications

Earthquake zone III

Importance factor 1

Response reduction factor 5

Wall load 11.04 kN/m

Parapet wall load 4.6 kN/m

Typical floor live load 3 kN/m

Terrace love load 1.5 kN/m

Typical floor Super dead 2 kN/m

Floor finish 1 kN/m

Table 2: Loading

Table 3: Columns for the Position

All beams having size of 230 mm x 375 mm are passed in

analysis result of ETABS.

– All slabs are having the depth of 150 mm in all cases.

– Thickness of Shear wall provided in the case-2, case-4

and case-5 is of 180 mm.

– Column sizes for case-1 and case-2 is same and is given

in Table

– Column sizes for case-3, case-4 and case-5 are same and

is given in Table




C. Results and Discussion

1) Comparison between Construction Stage & Conventional

Analysis

Fig. 6: Bending Moment in Transfer Girder for case-1

Fig. 7: Shear force in transfer Girder for case-1

The maximum positive and negative bending moments are

linearly increasing as construction stage increases. The

maximum positive bending moment in transfer girder (case-

1) is 5% more when construction stage analysis is used

compare to conventional analysis. The shear forces at support

and at floating column are linearly increasing as construction

stage increases. The maximum shear force in transfer girder

(case-1) is 3% more when construction stage analysis is used

compare to conventional analysis. The maximum deflection

in transfer girder (case-1) is 5% more when construction stage

analysis is used compare to conventional analysis.



The maximum positive and negative bending

moments are linearly increasing as construction stage

increases. The maximum positive bending moment in transfer

girder (case-2) is 5% more when construction stage analysis

is used compare to conventional analysis. The shear forces at

support and at floating column are linearly increasing as

construction stage increases. The maximum shear force in

transfer girder (case-2) is 3% more when construction stage

analysis is used compare to conventional analysis. The

maximum deflection in transfer girder (case-2) is 5% more

when construction stage analysis is used compare to

conventional analysis.














































III. CONCLUSION

1) Construction stage analysis in structure is important to

improve the analysis accuracy in terms of displacement,

axial force, bending moment and shear force in transfer

girder and column near of it and also for structure as a

whole.

2) Bending moment and shear force in transfer girder are

higher in construction stage analysis which must be

consider in design phase for avoiding cracking of the

beam and column due to sequence effect.

3) In case of displacement, structure analyzed utilizing

construction stage analysis indicates considerable larger

displacement which is reality in comparison to

conventional analysis in which structure is

conceptualized as entire and loaded at the same time after

construction which is not reality.

4) The provision of shear wall improves the behavior of

transfer girder under earthquake load.

5) The maximum reduction in bending moment is about

85% due to the provision of the shear wall under

earthquake load.

6) The beam above the transfer girder shows drastic change

in flexural behavior as we construct the floor stage wise,

it changes from hogging to ultimately sagging which

should be taken care while designing the beams above

the transfer girder.

7) In conventional analysis, this flexural behavior change is

not getting reflected and it may result into the flexural

cracking, if beams are designed considering

conventional analysis only.

8) The transfer girder must be design as partially

prestressed member to get acceptable depth of girder

rather than fully prestressed member.




REFERENCES

[1] Chris, G. and Constantin, E. (2013) “Design of partially

prestressed concrete beam based on cracking control

provision” Engineering Structures 48, pp. 402–416.

[2] Devashree, U., Salunke, P. and Sayagavi, V. (2014)

“Cost optimization of post-tensioned I girder”

International Journal of Students Research in

Technology & Management, Vol.2 (01), Jan –Feb,

ISSN 2321-2543, and pp. 14-18.

[3] Edward, G., Christopher, B. and Yook-Kong, Y (1986)

“Anchorage zone stresses of beams subjected to shear

force” J. Struct. Eng. no. 113, pp.1789-1805.

[4] Eric, skibbe (2010) “A Comparison of Design using

Strut-And-Tie of Modelling and Deep Beam Method for

Transfer Girders in Building Structures ”B.S, Kansas

State University.

[5] Elif A. (2010) “Transfer and development length of

strands in post-tensioned members after anchor head

failure” M.sc Thesis, University of Central Florida.

[6] Jacques, E J. (1971) "Study of long-span prestressed

concrete bridge girders." J. Prestressed Concrete Inst.,

pp. 24-42.

[7] Kaung, J. And Puvvala, J. (1996) “The Behaviour and

failure of wall beams in tall building” Proc. Of 2nd Int.

Conf. Multi-Purpose High-Rise Towers and Tall

buildings, Singapore, pp. 139-143.

[8] Michael S., Zenon A., and Abdolrahim N. (1989)” Pre-

tensioned and Post-tensioned composite girders”

Journal of Structural Engineering, Vol. 115, No. 12,

December, pp. 3142-3153.

Documents

Finite Element Analysis and Design of Post-Tensioned ... · Finite Element Analysis and Design of Post-Tensioned Transfer Girder ... Construction stage analysis in structure is important