Seismic Engineering Fundamentals

This lecture covers the response spectrum method, equivalent lateral force method, and their applications in seismic engineering. It explains the modes of vibration, SRSS combination, and base shear calculations for inelastic systems. The instructor discusses the limitations and simplifications of the ELF method, emphasizing its use for new buildings. The importance of building regularity, floor rigidity, and fundamental period in ELF analysis is highlighted. The distribution of lateral forces over building height, regularity criteria in plan and elevation, and the horizontal distribution of forces are also explained. Practical examples and steps for implementing the ELF method are provided, along with considerations for torsional effects and multi-directional excitations in seismic design.