Dynamic Analysis of Blast Resistant Buildings
Dynamic Method of Blast Analysis in Petrochemical Facilities and Study of IS 4991:1968.
Dr. Sidramappa V. Itti 1, Shishir S. Kadam 2
1 Head of Department, K.L.E. College of Engineering and Technology, Belgaum, India.
2 M.Tech (Structural Engg) Graduate, K.L.E. College of Engineering and Technology, Belgaum, India.
Email: ittisv@gmail.com 1, shishir.kadam@gmail.com 2
Abstract
Process plants in the petrochemical industries handle hydrocarbons and other fuels which may produce accidental explosion. Plants are designed to minimize the occurrence of such incidents. In today’s scenario the focus is on structural aspects of design or evaluation of buildings for blast resistance, establishing the design blast loads from overpressure, setting the structural performance requirements and designing the buildings and structures to withstand these loads within the required performance limits. This paper presents discussions on dynamic approach of design and analysis of a structure in petrochemical facilities, with numerical simulation study aiming to characterize the various structural effects of vapor cloud explosion. Numerical time integration method is used for caring out the analysis, where in an program has been written in MS EXCEL to carry out the incremental solution by solving the dynamic equilibrium equation for the displacement at each time step and results of previous time steps and the current time step are used with recurrence formulas to predict the acceleration and velocity at the current time step. A R.C.C. box structure is designed and analyzed by dynamic and static approach for various response ranges. Results show that dynamic analysis gives more economical and safer designs compared to other methods of analysis. Based on the understanding of results, a study on IS 4991:1968 is carried out and suitable suggestions have been given for its revision, by implementing new theories and research carried out in and around the world.
Keyword:
Dr. Sidramappa V. Itti 1, Shishir S. Kadam 2
1 Head of Department, K.L.E. College of Engineering and Technology, Belgaum, India.
2 M.Tech (Structural Engg) Graduate, K.L.E. College of Engineering and Technology, Belgaum, India.
Email: ittisv@gmail.com 1, shishir.kadam@gmail.com 2
Abstract
Process plants in the petrochemical industries handle hydrocarbons and other fuels which may produce accidental explosion. Plants are designed to minimize the occurrence of such incidents. In today’s scenario the focus is on structural aspects of design or evaluation of buildings for blast resistance, establishing the design blast loads from overpressure, setting the structural performance requirements and designing the buildings and structures to withstand these loads within the required performance limits. This paper presents discussions on dynamic approach of design and analysis of a structure in petrochemical facilities, with numerical simulation study aiming to characterize the various structural effects of vapor cloud explosion. Numerical time integration method is used for caring out the analysis, where in an program has been written in MS EXCEL to carry out the incremental solution by solving the dynamic equilibrium equation for the displacement at each time step and results of previous time steps and the current time step are used with recurrence formulas to predict the acceleration and velocity at the current time step. A R.C.C. box structure is designed and analyzed by dynamic and static approach for various response ranges. Results show that dynamic analysis gives more economical and safer designs compared to other methods of analysis. Based on the understanding of results, a study on IS 4991:1968 is carried out and suitable suggestions have been given for its revision, by implementing new theories and research carried out in and around the world.
Keyword:
References: [1] American Society of Civil Engineers (1997), Design of Blast Resistant Buildings in Petrochemical Facilities, Reston, VA. [2] U.S. Army Corps of Engineers (1990) TM 5-1300, Structures to Resist the Effects of Accidental Explosions, U.S [3] IS 4991:1968, Criteria for Blast Resistant Design of Structures for Explosions above Ground, Bureau of Indian Standards, New Delhi, New Delhi, 1968. [4] SG-22, Sitting and Construction of New Control Houses for Chemical Manufacturing Plants, Safety Guide SG-22, Manufacturing Chemist Association, Washington, DC, 1978 [5] Biggs, john M. (1964), Introduction to Structural Dynamics, McGraw-Hill, New York, NY. [6] Mario Paz 1991, Structural Dynamics: Theory and Computation, third edition, Mario Paz, Van Nostrand Reinhold Inc., New York, NY, 1991.