(Formerly numbered C239.) Lecture, four hours; discussion, two hours; outside study, six hours. Recommended requisite: course 135B. Basic structural dynamics course for civil engineering students. Elastic free and forced vibrations of single degree of freedom systems, introduction to response history and response spectrum analysis approaches for single and multi-degree-of-freedom systems. Axial, bending, and torsional vibration of beams. Letter grading.