Structural Analysis and Design of an Auditorium using Extended-3D Analysis of Building System

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Structural Analysis and Design of an Auditorium using Extended-3D Analysis of Building System

Ashwini Mareena Sam1, Devika J S2, Panchami P S3, Muhammad Salih N4, Rajeev Kumar P5*

1, 2,,3,4 IV yr BTech students; 5Professor

Department of Civil Engineering

Musaliar College of Engineering & Technology, Pathanamthitta, Kerala

Abstract This technical paper highlights the project work pertaining to the structural analysis and design of a multipurpose auditorium using a computer software, Extended3D Analysis of building System, abbreviated as ETABS®. Shape of the auditorium was linear (rectangular). This includes planning, analysis of loads and designing of structural elements based on different loading conditions. Planning of acoustic and vision point of view were taken from National Building Code, and the limit state method of collapse using respective IS codes. AutoCAD® was used for drawing plan, elevation and section of auditorium. Design and analysis were done manually and the results were verified using ETABS®. For completeness a cost estimation was also performed. Such a work would enable the economic design of an auditorium.

Keywords Structural analysis; design, ETABS®, AutoCAD®, auditorium, cost estimation

  1. INTRODUCTION

    An auditorium is a multipurpose facility where a room built to enable an audience to hear and watch performances. For movie theatres, the number of auditoria (or auditoriums) is expressed as the number of screens. Auditoria can be found in entertainment venues, community halls, and theatres, and may be used for rehearsal, presentation, performing arts productions, or as a learning space. Seating arrangements in an auditorium seating layout (or assembly space) are either be identified as multiple-aisle or continental. These terms are commonly found in design standards manuals, building codes, and similar architectural reference documents. Each size is unique, with specific guidelines governing row size, row spacing, and exit ways. Basically, a multiple-aisle arrangement will have a maximum of 1416 chairs per row with access to an aisle-way at both ends. In a continental arrangement, all seats are located in a central section. Here the maximum quantity of chairs per row can greatly exceed the limits established in a multiple-aisle arrangement. In order to compensate for the greater length of rows allowed, building codes will require wider row spacing, wider aisles, and strategically located exit doors. Although it would seem like more space is called for, a continental seating plan is often not any less efficient than a multiple-aisle arrangement. In fact, if it is carefully planned, a continental arrangement can frequently accommodate more seating within the same space [1].

    Many researchers have conducted works in this area [2]- [5]. Objective of this paper is to perform the structural analysis and design of a multipurpose auditorium for a seating capacity of 1000 audience, at Pathanapuram municipality, Kerala state. In this paper details of the analysis and design of

    an auditorium done by the software package called as ETABS®. ETABS® is the abbreviation of “Extended 3D Analysis of Building System [6]. For completeness, a cost estimation for construction is also performed. It is thought that such a study would help to perform an economical and environment friendly design and construction of an auditorium at this location.

  2. LOCATION DETAILS OF THE SITE

    The proposed site is at Pathanapuram municipality, Pathanamthitta district, Kerala state. Figure 1 shows the proposed site and Table 1 gives the details of the proposed auditorium:

    District/StatePathanamthitta/Kerala
    Municipality/TalukPathanapuram
    Type of auditoriumMultipurpose
    Type of soil in the siteLateritic soil
    Type of structureRCC/steel
    Estimated capacity1000
    Estimated Area10764 sq. ft.
    Estimated Area of Auditorium8000 10000 sq. ft
    District/StatePathanamthitta/Kerala
    Municipality/TalukPathanapuram
    Type of auditoriumMultipurpose
    Type of soil in the siteLateritic soil
    Type of structureRCC/steel
    Estimated capacity1000
    Estimated Area10764 sq. ft.
    Estimated Area of Auditorium8000 10000 sq. ft

     

    Fig. 1. Proposed site in Pathanapuram, Kerala state TABLE I. DETAILS OF PROPOSED AUDITORIUM

  3. ANALYSIS AND DESIGN OF AUDITORIUM

    A: PLANNING OF AUDITORIUM

    A number of standard codes approved by Indian Standard institutions has specified the following minimum requirements for the construction of the auditoriums:

    1. FRONT AND REAR OPEN SPACES:

      No person shall erect a building unless it is set back at least 6m from the regular line of the street or from the street if no such regular line exists.

    2. PLAN AREA:

    Plan area of the building is to be fixed at an occupant load of range 0.6 to 0.9 m2 /member.

    Drawings were done using AutoCAD®. Details of the step- by-step procedure can be obtained from [7]. Site plan, front elevation, side elevation, cross-section and plan are shown in Figures 2 to 6. Different components of the auditorium are given in Table 2.

    Fig 2. Auditorium site planning

    Fig 3. Auditorium front elevation

    Fig 4. Section of auditorium

    Fig 5. Auditorium side elevation

    Fig 6. Auditorium plan view

    B: ETABS ANALYSIS

    As discussed in the above sections, structural analysis was done using ETABS®. Different steps involved in the process is shown below.

    TABLE II: COMPONENTS OF THE AUDITORIUM

    ComponentsStandard SizesSize ProvidedQuantities Provide
    Side Entrance1.5-3m1.5 m6
    Main entrance1.5m1.5 m1
    Total seats at ground floor0.45-0.65m0.5m × 0.46m1000
    no of seats per row0.45-0.65m0.5m × 0.46m10
    no of seats per Coloumn0.45-0.65m0.5m × 0.46m50
    Steps provided at entranceAs per planning3.5 m3
    Steps guiding to stageAs per planning1.7 m6 at each side
    Distance between two chairs for circulationAt least 0.85 m0.87 m
    Changing roomAs per planning3 × 4 m2
    Gents ToiletAs per planning1.5 × 1.5 m3
    Ladies ToiletAs per planning1.5 × 1.5 m3

    The structure created in the ETABS® is shownin Figure 7. Inbuilt algorithms in the software do the analysis of the structure and give the output files. Figures 8 and 9 show the loads applied on the structure and the output of final analysis output respectively. From the output files different standard sections can be obtained and it is used for the construction.

    Fig 7. Structure created in ETABS

    Fig 8. Loads applied on the structure

    Fig 9. Output of analysis of the structure

  4. CONCLUDING REMARKS

This work highlighted the analysis and design of a multipurpose auditorium at Pathanapuram municipality, Kerala state using ETABS® software. Preliminary drawings were done using AutoCAD®. For completeness, a cost estimation for the construction was also carried out and the estimated cost was found as Rs 1,22,00000/-.

REFERENCES

  1. National Building Code of India (2018), Bureu of Indian Standards, New Delhi.
  2. Ch. Pratyusha et al(2017) PLANNING, ANALYSIS AND DESIGN OF AUDITORIUM, International Journal For Technological Research In Engineering Volume 4, Issue 12
  3. Bhoite et al(2017) Design Of College Auditorium For PES College Of Engineering, Phaltan, International Journal of Informative & Futuristic Research, 7 ,6851-6858.
  4. Sri Priya et al(2018) Design of an Auditorium Building, International Journal of Innovative Research in Science, Engineering and Technology, Vol. 7, Issue 4.
  5. Shivam Asawa et al (2017) Structural Design of Concrete Structure Using E-Tabs IOSR Journal of Mechanical and Civil Engineering,

    Volume 14, Issue 1 PP 49-51

  6. ETABS v16 (2018) Computures and structures Inc. USA
  7. AutoCAD (2018) AutoDESK Inc, USA.
  8. Ramamrutham S (2016), Design of RC Structures. S Dhanpat Rai publications, New Delhi
  9. Norris C.H. and Wilbur J (1991), Elementary Structure Analysis, 10th Edition, McGraw-Hill company limited, New York.
  10. IS: 875 (1987), Part III – Code of Practice for Design Wind Loads for buildings. Bureu of Indian Standards, New Delhi.
  11. IS 456:2000 Plain Concrete Code of practice, Bureu of Indian Standards, New Delhi.

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