PARAMETRIC STUDY OF PORTABLE RESS (RAPID ERECTION SUN SHELTERS) WITH NCEL

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1 International Journal of Civil Engineering and Technology (IJCIET) Volume 8, Issue 4, April 17, pp Article ID: IJCIET_8_4_17 Available online at ISSN Print: and ISSN Online: IAEME Publication Scopus Indexed PARAMETRIC STUDY OF PORTABLE RESS (RAPID ERECTION SUN SHELTERS) WITH NCEL Tejas Keshaorao Dange P.G. Student, School of Civil and Chemical Engineering VIT University, Vellore, Tamil Nadu, India Dr. Neeraja Associate Professor, School of Civil and Chemical Engineering VIT University, Vellore, Tamil Nadu, India ABSTRACT Rapid erection sun shelters (RESS) are the portable hangars, which are used as storage space and shed for refugee camps or aircraft such as fighter planes etc. These structure exhibit higher bending strength in case of longer spans and are very light in weight due to which the dead weight of structure does not affect the stability and strength of structure. In this paper we focus on the parametric analysis of three models for Mig-27K, Mig and Su-3MKI.Foranalysis the governing external load is wind load so we have considered the effect of various Basic wind speed on models. For the force calculation we have taken aid of NCEL Technical Report-7 and IS 875 (Part-3): 15.The analysis has been completed using Staad-Pro software. Key words: RESS, NCEL, Wind load, IS 875(Part-3)15,Kedar, Staad Pro. Cite this Article: Tejas Keshaorao Dange and Dr. Neeraja, Parametric Study of Portable RESS (Rapid Erection Sun Shelters) with NCEL. International Journal of Civil Engineering and Technology, 8(4), 17, pp INTRODUCTION RESS are not different from regular steel hangars, which we see at airport, it is different in construction material. The notion behind the RESS is the cost effectiveness and customization according to customer requirement. The RESS is made of low weight, high strength aircraft grade Aluminium Alloy with special lightweight, high strength, and fire retardant PVC coated fabric as cladding. The RESS can be manufactured and designed as per specific requirements and theoretically, it can be supplied in any length. Because of these design features, the RESS is very light in weight RESS is easy to assemble/dismantle connections, due to which it can be relocated easily and hence can be very useful for Disaster Management especially during floods/earthquakes as home for people. The RESS can be

2 Tejas Keshaorao Dange and Dr. Neeraja installed on a various surface like RCC, Hard ground, Sand, Mud etc., However the anchoring technique may vary as per soil condition. Figure 1 Typical View of RESS The RESS structure is covered by a PVC coated fabric, which is fire retardant in nature. It is attached to the frame with the help of Kedar rope for which special extrusion has to be made to fit. In RESS structure, All the frames are at equidistant for better stability. The length of RESS structure is divided into number of frames. All frames are connected to each other with the help of purlins. The initial and terminal frames are provided with bracing to regulate the forces with in the structure. Due to these provisions, whole structure act in box action which increases the stability, strength and efficiency of structure. The RESS frame is divided into three parts, which are curved beam, extension beam and ridge. For longer or shorter spans the curved beam dimension remain same however, the extension beam span will vary according to span. The extrusion of frames supports the fabric enveloping the structure as well as the electrical wiring. 2. CURRENT STATUS Regarding steel hangars various Research work has been done but very rare research has been done on Rapid Erection Sun Shelters, After an extensive literature review shows that reported work on this topic is limited. M. Jacoby (1988) - In this paper he has worked out the various external pressure coefficient for wind load for RESS hangars, for various angles with respect to structure. They conducted various wind tunnel test at California wind tunnel Laboratory and work out the coefficient for at various location of structure. Chen Wang et al (13)-They published a paper in which they studied about the various tensioned membrane structures (RESS) and their application as well as defects occur in various components. They have concluded the due to material properties of aluminium various cost on defects is less as compared to steel. Yingying Zhang, Qilin Zhang, Zonglin Yang, Lu Chen, Yuan Cao (15) - They published a paper in which they studied about various mechanical effects occurred in to the tensile membranes structure. They concluded the fabric is very durable for external loa also distributes load to various components very efficiently editor@iaeme.com

3 Parametric Study of Portable RESS (Rapid Erection Sun Shelters) with NCEL 3. OBJECTIVE AND STUDY With literature reviews presented the objective of this present study is to Study the structural behaviour of RESS for various wind speed. For analysis STAAD.ProV8i software results will be taken into consideration The paper aims to show the various parametric study for the models considered for analysis. To check the serviceability criteria. To check the effect of bracing on the end frames of RESS. 4. MODELLING Based on Parametric study of various aircraft, the dimensions of various RESS model are as follows. Model 1 consider for Mig -27k, Model 2 for Mig and Model 3 for Su-3MKI Figure 2 Autocad model of RESS Data Considered for modelling is as shown table-1 below:- Table 1 Model Width (D) (m) Height(H) (m) Length (L) (m) Number of frames Frame Spacing (m) H/D L/D Figure 3 STAAD model-1 For Mig-27k editor@iaeme.com

4 Tejas Keshaorao Dange and Dr. Neeraja Figure 4 STAAD model-2 For Mig Figure 5 STAAD model-3 For Su-3MKI Section Properties Section Considered for modelling of section in Staad.Pro is as shown in fig Figure 6 Section Properties of Frame Section editor@iaeme.com

5 Parametric Study of Portable RESS (Rapid Erection Sun Shelters) with NCEL 5. ANALYSIS Data considered for analysis: Dead load with all other accessories.8 kgm s-2 (weight of fabric) Live load -.51 knm -2 (Reference IS 875-(Part-2): 1987, roof angle base on 25 ) Basic wind speed: - 33ms -1, 39ms -1, 44ms -1, 47ms -1, 5ms -1, 55ms -1 Design life of structure:- 5 years Terrain category: - 2 Internal pressure coefficient (cpi): (Reference IS 875-(Part-2): 1987 External pressure coefficient: standard model Considered from table-2is A5. For external force coefficient, we have taken the aid of NCEL (Naval Civil Engineering Laboratory) technical report-7, they have given various external force coefficient for five different models. To use that we have to take L/D and H/D ratio of model-1, model-2 & model-3 compare it with the L/d and H/D ratio of models mentioned in the table-1, whichever matches with the ratio of standard models that model we should consider for external pressure coefficient. Table 2 Standard model table from NCEL. Model L D H A A A A B C Table 3 External Pressure Coefficient table from NCEL for standard model A5. Section Azimuth Angle Load combination: -(As per IS 456:) 1.5 DL LL + 1 WL 1.5 DL+ 1.5 WL.9 DL LL WL editor@iaeme.com

6 Tejas Keshaorao Dange and Dr. Neeraja 6. RESULTS The results which we have gotten after analysis in STAAD. Pro for 33ms -1, 39ms -1, 44ms -1, 47 ms -1, 5 ms -1, 55 ms -1 basic wind speed. The results are shoen separately for internal and external frames due to effect of bracing in external frames. 33 ms -1 1 Figure 7 (a) For internal frames 33 ms -1 Figure 7 (b) For external frames 39 ms -1 Figure 8 (a) For internal frames editor@iaeme.com

7 Parametric Study of Portable RESS (Rapid Erection Sun Shelters) with NCEL 39 ms -1 1 Figure 8 (b) For external frames 44 ms -1 1 Figure 9 (a) For internal frames 44 ms -1 Figure 9 (b) For external frames editor@iaeme.com

8 Tejas Keshaorao Dange and Dr. Neeraja 47 ms Figure 1 (a) For internal frames 47 ms -1 1 Figure 1 (b) For external frame 5 ms Figure 11 (a) For internal frames editor@iaeme.com

9 Parametric Study of Portable RESS (Rapid Erection Sun Shelters) with NCEL 5 ms -1 1 Figure 11 (b) For external frames 55 ms Figure 12 (a) For internal frames 55 ms -1 1 Figure 12 (b) For external frames editor@iaeme.com

10 Tejas Keshaorao Dange and Dr. Neeraja 7. CONCLUSION After the parametric study of the models and results, which we have got through analysis, we can conclude following points We can observe the significant amount of reduction in moments and reaction in frames connected to bracing rather than the frames without bracing. There is not much change in results of model 1 and model 3 as both models have approximately similar dimensions. The deflections are in safe limits as per IBC 9 its L/1 for Hangars. so according to this the maximum allowable deflection for model-1 is 1mm, for model-2 is 143mm and for model-3 is 188mm. so the serviceability criteria is safe. Due to bracing in the external frames, the forces are properly circulated with in the structure and the maximum moments are shifted to internal frames rather than external frames. REFERENCES [1] M. Jacoby, (1988) Pressure coefficient for basic tensioned membrane structure forms, Naval Civil Engineering Laboratory, California. [2] Chen Wnag, Hmazah Abdul Rahman, Lincoln C. Wood, Faizal Azlimohd-Rahm, Nushuhada Zainon and EllvisSaputin,, Defects In The Tensioned Membrane Structures In Tropics, American Society of Civil Enginners (ASCE) (15) [3] Yingying Zhang, Qilin Zhang, Zonglin Yang, Lu Chen, Yuan Cao, Load Dependant Mechanical Behaviour of Membrane Materials And Its Effects On Static Behaviour of Membrane Structures. American Society of Civil Enginners (ASCE) (15), [4] Aniket N. Tolani, Aniket S. Patil, Ganesh N. Patil, Vedang H. Vadalkar, P. R.Barbude, Advantages of Tensile Structures Over Other Space Frame Structures, IJRET, eissn: pissn: [5] Krisztián Hincz, Ph.D.1 and Mauricio Gamboa-Marrufo, Ph.D., Deformed Shape Wind Analysis of Tensile Membrane Structures DOI-1.161/(ASCE)ST X American Society of Civil Engineers. [6] IS 875 (Part-3): 15,Design Loads (Other than Earthquake) for Buildings and Structures- Code of Practice, Part 3 Wind Loads (Third Revision). [7] Shadhan, K. K. Optimal Diagrid Angle to Minimize Drift in High-Rise Steel Buildings Subjected to Wind Loads. International Journal of Civil Engineering and Technology, 6 (11), 15, pp [8] T.V.V.S. Murali Manohar and N. Jitendra Babu, Effect of Shape of Tall Buildings Subjected To Wind Loading. International Journal of Civil Engineering and Technology, 8(1), 17, pp editor@iaeme.com