Dynamic Analysis

Dynamic Analysis

In order to perform the seismic analysis and design of a structure to be built at a particular location, the actual time history record is required. However, it is not possible to have such records at each and every location. Further, the seismic analysis of structures cannot be carried out simply based on the peak value of the ground acceleration as the response of the structure depend upon the frequency content of ground motion and its own dynamic properties. To overcome the above difficulties, earthquake response spectrum is the most popular tool in the seismic analysis of structures. There are computational advantages in using the response spectrum method of seismic analysis for prediction of displacements and member forces in structural systems. The method involves the calculation of only the maximum values of the displacements and member forces in each mode of vibration using smooth design spectra that are the average of several earthquake motions.

Response Spectrum Analysis method

  • It is a linear elastic analysis method using modal analysis procedures, where the structure is subjected to spectral accelerations corresponding to a design acceleration response spectrum
  • The design earthquake ground motion, in this case, is represented by its response spectrum

What you'll learn

  • Requirements of dynamic analysis for structures
  • How to calculate static earthquake load from response spectrum curve
  • How to develop an excel program for calculation of response spectrum function
  • How to draw a graph from response spectrum function
  • How to define response spectrum function
  • How to define P-Delta for dynamic analysi
  • How to define modal cases for dynamic analysis
  • How to define dynamic load cases by response spectrum function
  • How to calculate scale factor for dynamic analysis
  • How to create design load combination for dynamic load

Prerequisite / Eligibility

  • BSc, MSc or PhD in Civil Engineering
  • Level 4 or 4th year student of bachelor’s in civil engineering

Course Teacher

Md. Sajjak Hosain, BSc (Civil, BUET), MSc (Geotechnical, BUET), Bangladesh

Brief Biography of Md. Sajjak Hosain


MSc in Civil and Geotechnical Engineering, BUET, Dhaka, Bangladesh
BSc in Civil Engineering, BUET, Dhaka, Bangladesh


Engr. Md. Sajjak Hosain is graduated from the Department of Civil Engineering, BUET, Dhaka-1000, in the year 2016. He is now completing his master’s degree from the same university in Geotechnical Engineering. He is a professional design engineer and training assistant at “Getoech & Structures” a specialized civil engineering consultancy firm. He is also a research assistant under Professor Dr. Jahangir Alam, Professor, Department of Civil Engineering, BUET. Md. Sajjak did his BSc in Civil Engg with a major in Structure.
Md. Sajjak has research interests and has publications in international conferences. His notable research works are “Cyclic load analysis on strengthening by micro-concrete, Simplified FEM analysis of mat foundation, Simplified FEM analysis of Shore pile, Revetment and retaining wall for coastal engineering”.
Md. Sajjak was involved in many consultancy projects where he designed/checked high rise RCC buildings, Jetty, Shore Pile, Container Terminal, Ground Improvement, Bridge, etc. He visited many construction projects to check with design or to solve any construction difficulties.

Course Advisor:

Professor Dr. Jahangir Alam, Department of Civil Engineering, BUET, Dhaka, Bangladesh

Certificate of Attendance

Certificate of attendance will be awarded after completion of all video lessons and quizzes

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Course Preview


Introduction to Dynamic Analysis, Part-1
Introduction to Dynamic Analysis, Part-2
Documents of Dynamic analysis

Static Analysis Procedure

Static Analysis Procedure, Part-1
Static Analysis Procedure, Part-2

Development of Response Spectrum Graph

Development of Response Spectrum Graph, Part-1
Development of Response Spectrum Graph, Part-2
Development of Response Spectrum Graph, Part-3
Development of Response Spectrum Graph, Part-4
Development of Response Spectrum Graph, Part-5

Input and Analysis

Input of Response Acceleration Graph in Software
Define Response Spectrum Function
Define Scale Factor and RSA Load Case
Revise of scale factor
Checking mass participating ratio
Finalization of scale for code minimum requirements

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Enrolled: 79 students
Lectures: 16