BLAST RESISTANCE ANALYSIS ON RESIDENTIAL BUILDING STRUCTURE

Blast Resistant Design on Residential Building Structure

1. Friday, 03 May 2024 1 PRESENTED BY: Prathamesh Lagad Vishal Nikam Aniket Yamgar Asharani Masal GUIDED BY: PROF. ROSHNI JOHN ANALYSIS OF BLAST LOAD ON G+2 STRUCTURE USING SAP 2000 Friday, 03 May 2024 1 DEPARTMENT OF CIVIL ENGINEERING (2023-24)

2. BLAST LOAD ANALYSIS It is a process used in engineering to evaluate the effects of explosive blasts on structures, such as buildings, bridges, and any other infrastructure. It involves studying of blast pressure waves, their impact, forces, and damage caused to the structure. This analysis needs some data against which the blast load is to be analyzed. Friday, 03 May 2024 2

3. DURATION OF BLASTS Short duration Loading- In this load is applied for a short duration on the model and is analyzed for the loads impact for that particular duration. Long Duration Loading- In this load is applied for a longer duration than the previous one and causes significantly more damage as it is acting for a long period of time. Friday, 03 May 2024 3

4. TYPES OF ANALYSIS TIME HISTORY ANALYSIS- Time History Analysis is a type of analysis used to study the dynamic behavior of applied loads on structure by two different methods. They are: - Linear Time History Analysis- This time history analysis calculates the solution to the dynamic equilibrium equation for the structural behavior at an arbitrary time using the dynamic properties of structure Non-Linear Time History Analysis- This time history analysis mostly considers large displacements and elastoplastic materials and therefore superposition effect cannot be applied. This must be carried out if the structure exhibits a significant change of its shape under applied loading. Friday, 03 May 2024 4

5. LITERATURE REVIEW Author’s Names : Boyina Sita Rama Krishna and Jinka Chandra Shekhar Name of the Journal: Blast load Analysis and Effect on High Rise Structures Year of Publication: 2018 This paper investigates effects of blast loads on high rise structures due to increasing terrorist attacks . They studied damage to the structure and decrease in strength and durability of structure. This study helps to understand the behavior of G+10 RCC structure, subjected to blast load. Structure designed in sap2000 software by nonlinear time history analysis. 5

6. LITERATURE REVIEW Author’s Names : Sana N. Kazi, P.V. Muley Name of the Journal: Analysis of blast resistant RCC structure Year of Publication: 2017 This paper presents the study of effect of Blast loading on a six storey RCC building. Effect of variable blast source weight is calculated by considering 30 m distance from point of explosion. The blast load was analytically determined as a pressure-time history and numerical model of the structure was created in SAP2000 . The influence of the lateral load response due to blast in terms of peak deflections, velocity, accelerations, inter storey drift is calculated and compared. 6

7. LITERATURE REVIEW Author’s Names : Hrvoje Draganić, Vladimir Sigmund Name of the Journal: Blast Loading on Structures Year of Publication: 2012 This paper describes the process of determining the blast load on structures and provides a numerical example of a fictive structure exposed to this load. The aim was to become familiar with the issue of blast load because of ever growing terrorist threat and the lack of guidelines from national and European regulations on the verification of structures exposed to explosions . The blast load was analytically determined as a pressure-time history and numerical model of the structure was created in SAP2000. The results confirm the initial assumption that it is possible with conventional software to simulate an explosion effect 7

8. LITERATURE REVIEW Author’s Names : Shreya Vedhapathak, Ajay Hamane Name of the Journal: Analysis of Blast Resistant Structures Year of Publication: 2022 In this study a 12-storey building is subjected to 100kg and 200kg TNT charge weight with stand of distance 20m and 40m. Blast parameters are calculated using IS 4991-1968. Further four models are considered by implementing different structural systems and response of the models in terms of storey displacement and storey drift is considered to know the model with the structural element that helps resist the effect of blast. 8

9. LITERATURE REVIEW Author’s Names : Geethu Elsa Thomas, Dr. Kulbhushan Rai Name of the Journal: Analysis and Design of Blast Resistant Structure Year of Publication: 2016 This research focuses on an alternative section of cylindrical module of the shelter. The dynamic behavior of module under blast load is studied in finite element software Abaqus CAE 6.12. It is observed that the material stress-strain behavior is greatly influenced by strain rates of loadings. Shelter manually designed using codes in working stress method is verified with the analytical analysis. 9

10. LITERATURE REVIEW Author’s Names : P. Babu Aurtherson, K. Hari Ram Name of the Journal: Analytical Investigation of Blast Loading Impact on High Rise Structures Year of Publication: 2023 In this paper describe the blast loads on the buildings, the ten-storey building is proposed in this study. The primary reaction of the design is analyzed by utilizing the SAP2000 program. Based on IS 4991-1968 code the impact waves are evaluated. To achieve low base shear the proposed method compared with the existing methods like 3, 5, 7 and 9 storey buildings. The tall building structures of RC frame are analyzed with the standoff distances of 30m, 40m, 50m and 60m respectively 10

11. O BJECTIVES Determine the blast loads to be applied on structure. To analyze the effect of blast load on G+2 RC structure using SAP2000. Finding the s torey d rift of structure at different levels due to varying charge weights with respect to its stand-off distance. 11

12. Friday, 03 May 2024 12 METHODOLOGY PROCEDURE TO CALCULATE BLAST LOADS: - Calculate Radial Distance, R G = Calculate Scaled Distance, Z = Calculate Peak Overpressure, P s = Co-Efficient of Reflected Overpressure, Reflected Overpressure, Arrival Time, Positive Phase Duration, Blast Load =  

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15. CONDITIONS CONSIDERED FOR BLAST Case 1- Blast Load of 10 Kg @ 10 m Case 2- Blast Load of 10 Kg @ 20 m Case 3- Blast Load of 20 Kg @ 10 m Case 4- Blast Load of 20 Kg @ 20 m Friday, 03 May 2024 15

16. BLAST LOAD DATA Friday, 03 May 2024 16 STOREY W R B H   (kg) (m) (m) (m) Gr. Floor 10 10 20 3.5 1 st Floor 10 10 20 7 2 nd Floor 10 10 20 10.5 Radial Distance, R G Scaled Distance, Z Peak Overpressure, P s Co-Efficient of Reflected Overpressure, C R Reflected Overpressure, P R Arrival Time, t a Positive Phase Duration, t d Blast Load (m) (m) (Kpa)   (Kpa) (ms) (ms) (KN) 10.594 4.917 32.667 2.267 74.056 5.137 21.544 5183.93 12.206 5.665 25.532 2.132 54.434 4.461 21.544 3810.38 14.5 6.73 19.063 1.982 37.782 3.757 21.544 2644.74 CASE 1- Blast Load of 10 Kg @ 10 m

17. BLAST LOAD DATA Friday, 03 May 2024 17 CASE 1 CASE 2

18. BLAST LOAD DATA Friday, 03 May 2024 18 CASE 3 CASE 4

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21. CONCLUSION The storey drift values obtained from the analysis indicate significant displacements at higher levels of the G+2 structure under varying blast loads. The results show that as the charge weight increases, the storey drift values also increase, and as the distance is increased there is a significant decrease and that highlights the importance of considering blast loads in structural design to ensure stability and safety. Friday, 03 May 2024 21

22. THANK YOU Friday, 03 May 2024 22