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

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/State	Pathanamthitta/Kerala
   Municipality/Taluk	Pathanapuram
   Type of auditorium	Multipurpose
   Type of soil in the site	Lateritic soil
   Type of structure	RCC/steel
   Estimated capacity	1000
   Estimated Area	10764 sq. ft.
   Estimated Area of Auditorium	8000 10000 sq. ft

   District/State	Pathanamthitta/Kerala
   Municipality/Taluk	Pathanapuram
   Type of auditorium	Multipurpose
   Type of soil in the site	Lateritic soil
   Type of structure	RCC/steel
   Estimated capacity	1000
   Estimated Area	10764 sq. ft.
   Estimated Area of Auditorium	8000 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

   Components	Standard Sizes	Size Provided	Quantities Provide
   Side Entrance	1.5-3m	1.5 m	6
   Main entrance	1.5m	1.5 m	1
   Total seats at ground floor	0.45-0.65m	0.5m × 0.46m	1000
   no of seats per row	0.45-0.65m	0.5m × 0.46m	10
   no of seats per Coloumn	0.45-0.65m	0.5m × 0.46m	50
   Steps provided at entrance	As per planning	3.5 m	3
   Steps guiding to stage	As per planning	1.7 m	6 at each side
   Distance between two chairs for circulation	At least 0.85 m	0.87 m
   Changing room	As per planning	3 × 4 m	2
   Gents Toilet	As per planning	1.5 × 1.5 m	3
   Ladies Toilet	As per planning	1.5 × 1.5 m	3

   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.