STRUCTURAL DYNAMIC Notes

STR 484 / STR 485: Structural Dynamics Notes & Study Materials

📚 Course Overview & Academic Context
Structural Dynamics (STR 484 / STR 485) is a specialized 8th-semester elective in the Bachelor of Civil Engineering (BE Civil) curriculum at Pokhara University. This page serves as a dedicated archive for downloading complete lecture notes, solved numericals, unit guides, and past exam solutions. Dynamic behavior differs from static behavior because forces vary over time, inducing inertia effects and structural resonance.

🎯 Syllabus & Notes Topics Covered

Unit 1: Introduction to Dynamic Analysis – Basic concepts of vibration, dynamic forces vs. static loads, degree-of-freedom (DOF) systems, and mathematical modeling of structural systems.
Unit 2: Single Degree of Freedom (SDOF) Systems – Free vibration response of damped and undamped systems; harmonic loading, periodic excitation, transmissibility ratio, and dynamic magnification factors; response to arbitrary, impulse, and step loads (including Duhamel’s Integral and numerical step-by-step evaluation).
Unit 3: Multi-Degree of Freedom (MDOF) Systems – Formulation of equations of motion, mass and stiffness matrices, evaluation of natural frequencies, and mode shapes.
Unit 4: Distributed Parameter / Continuous Systems – Dynamic behavior of continuous elements like beams and frames subjected to transverse vibrations.
Unit 5: Practical & Seismic Applications – Modal analysis, elastic response spectra, dynamic response under earthquake forces, and shock absorption principles.

📝 What You Will Find in This Category

Handwritten & Chapter Notes: Unit-wise PDF lecture notes written according to the official Pokhara University syllabus.
Solved Numerical Problems: Step-by-step solutions for SDOF, MDOF frequencies, and response spectra problems.
Past Board Exam Papers: Previous year question collections with detailed solutions to help with exam revision.
Quick Revision Sheets: Summary sheets covering core dynamic formulas, stiffness matrices, and unit definitions.

💡 Study Tip for Students
Key Strategy: Master SDOF dynamic equilibrium equations and numerical methods early in your preparation to easily tackle MDOF matrix formulations and seismic response calculations.