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McMaster University Department of Civil Engineering Fall 2018 CE 4SD4 CE 4SD4 – Structural Dynamics and Earthquake Engineering Instructor Prof. Dimitrios Konstantinidis Office: JHE-336 Office hours: Mon, Wed 2:00 - 3:00 pm, or by appointment E-mail: konstant@mcmaster.ca Teaching Assistant Ms. Neda Salari (PhD candidate) E-mail: salaritn@mcmaster.ca Location and Time Lecture: Mon 12:30 - 1:20 pm HH 217; Tue 1:30 - 3:20 pm HH 217 Tutorial: Tue 3:30 - 5:20 pm ETB 224 Course Overview This is an introductory course in structural dynamics and its application to earthquake engineering. We will begin by looking at simple structures called Single-Degree-of-Freedom (SDOF) systems that are subjected to time-dependent (dynamic) loading, such as, for example, an earthquake. We will learn how to formulate the equations that describe the motion of such a system. Solution of these equations provides us with the structural deformations, from which we will compute the corresponding forces. Analysis of these simple systems subjected to earthquake loading naturally leads to fundamental concepts in earthquake engineering, such as the Seismic Response Spectrum, an extremely powerful tool in seismic design. We will extend our discussion to more complicated structures, like multi-storey buildings, that are called Multi-Degree-of-Freedom (MDOF) systems. We will learn methods that are used to simplify seismic analysis and design of such complicated structures. Lastly, we will learn about the different seismic design provisions in the building code. Learning Outcomes 1. Ability to identify when a structure can be modelled as a SDOF system and to formulate the equation that describes the motion of such a system. 2. Ability to analyze SDOF systems subjected to simple loading, e.g., impulses, constant force, ramp force, harmonic force. 3. Ability to use time-stepping procedures (e.g., central difference, Newmark’s method) to compute the response of a SDOF system subjected to earthquake excitation. 4. Ability to compute new and use existing earthquake response spectra. 5. Ability to formulate the matrix equation of motion of MDOF systems. 6. Ability to use response history analysis and response spectrum analysis to compute the earthquake response of realistic structures. 7. Ability to use realistic modelling assumptions to simplify complex structural dynamics problems. 8. Familiarization with seismic design criterial in the National Building Code of Canada. Prerequisites CE 2Q03 (Engineering Mechanics: Dynamics), CE 3G04 (Structural Analysis) Basic programming skills in Matlab (e.g., vector and matrix calculations, 2D plotting, for/while loops) Required Textbook Anil K. Chopra. Dynamics of Structures: Theory and Applications to Earthquake Engineering, 5th edition. Pearson, 2017. ISBN-10: 0134555120, ISBN-13: 9780134555126. Optional Textbooks If you feel that you need additional references to clarify or reinforce concepts covered in the course, you may find the following texts useful (available on-reserve for the course at Thode Library): Raymond W. Clough and Joseph Penzien. Dynamics of Structures. McGraw-Hill. Jagmohan L. Humar. Dynamics of Structures. CRC Press/Taylor & Francis. 1 of 3 McMaster University Department of Civil Engineering Fall 2018 CE 4SD4 Class Attendance and Avenue to Learn Attendance in lecture and tutorial is required. If a student is unable to attend, they are responsible for getting the notes from a friend. Students are expected to regularly check Avenue to learn for course announcements, homework assignments and solutions, etc. Requests for Relief for Missed Academic Term Work - McMaster Student Absence Form (MSAF) In the event of an absence for medical or other reasons, students should review and follow the Academic Regulation in the Undergraduate Calendar “Requests for Relief for Missed Academic Term Work.” Assignments There will be approximately 10 homework assignments. These assignments are primarily intended to allow students to apply theory and to practice for midterms and the final. Solutions must abide by the following few but important rules: 1. All pages should be stapled together, and the student’s name and number should appear on the first page of the solution. 2. Solutions must be neat and well organized. 3. The solution procedure must be clearly stated, followed by calculations. 4. Principal results must be clearly identified (i.e., boxed or underlined). The teaching assistant reserves the right to deduct up to 25% for assignments that do not follow these rules. In many cases, a computer will be used to solve or aid in solving a problem. Make sure that the solution is presented in a complete and readily understood format. Only significant, easily interpreted parts of computer output should be included in the problem solution— superfluous computer output should be avoided. Late assignments will not be accepted. If a student has obtained an MSAF, the weight of the missed assignment will be transferred to the final exam. It is understood that due to one reason or another, a student may not be able to submit an assignment; for this reason, the lowest homework assignment score will be dropped in calculating the final grade, provided that the student has not missed more than one assignment during the course. Examinations There will be two midterm exams and the final exam. The midterm exams are scheduled for Tuesday, October 16, 1:30-3:20 pm, Location: HH-217 Tuesday, November 13, 1:30-3:20 pm, Location: HH-217 Note: The dates/times of the midterm exams are solid. There will be no make-up exams. It is the responsibility of the student to make themselves available during these times. Students will be allowed one 8.5x11" (letter) “crib sheet” with writing on both sides during examinations. In the event that a student misses a midterm exam, an MSAF cannot be submitted. To be considered for relief, per University policy (please refer to http://mcmaster.ca/msaf/), a student “must report to their Faculty Office to discuss their situation and will be required to provide appropriate supporting documentation.” If the Faculty Office approves the absence, the instructor will determine the appropriate relief. Grading Assignments 10%, Midterm Exams 25% each, Final exam 40% Academic Integrity You are expected to exhibit honesty and use ethical behaviour in all aspects of the learning process. Academic credentials you earn are rooted in principles of honesty and academic integrity. Academic dishonesty is to knowingly act or fail to act in a way that results or could result in unearned academic credit or advantage. This behaviour can result in serious consequences, e.g. the grade of zero on an assignment, loss of credit with a notation on the transcript (notation reads: “Grade of F assigned for academic dishonesty”), and/or suspension or expulsion from the university. It is your responsibility to understand what constitutes academic dishonesty. For information on the various types of academic dishonesty please refer to the Academic Integrity Policy, located at www.mcmaster.ca/academicintegrity. The following illustrates only three forms of academic dishonesty: 1. Plagiarism, e.g. the submission of work that is not one’s own or for which other credit has been obtained. 2. Improper collaboration in group work. 3. Copying or using unauthorized aids in tests and examinations. 2 of 3 McMaster University Department of Civil Engineering Fall 2018 CE 4SD4 Discrimination The Faculty of Engineering is concerned with ensuring an environment that is free of all discrimination. If there is a problem, individuals are reminded that they should contact the Department Chair or the Human Rights Consultant, as the problem occurs. Academic Accommodation of Students with Disabilities Students with disabilities who require academic accommodation must contact Student Accessibility Services (SAS) to make arrangements with a Program Coordinator. Student Accessibility Services can be contacted by phone 905-525-9140 ext. 28652 or e- mail sas@mcmaster.ca. For further information, consult McMaster University’s Academic Accommodation of Students with Disabilities policy. Note: in recent years, scheduling an exam through SAS has been challenging if not done early in the semester because spots fill up quickly. Students with approved SAS accommodations should contact SAS on the first week of classes to reserve a spot for the midterm exam dates/times listed above. Academic Accommodation for Religious, Indigenous or Spiritual Observances (RISO) Students requiring academic accommodation based on religious, indigenous or spiritual observances should follow the procedures set out in the RISO policy. Students requiring a RISO accommodation should submit their request to their Faculty Office normally within 10 working days of the beginning of term in which they anticipate a need for accommodation or to the Registrar's Office prior to their examinations. Students should also contact their instructors as soon as possible to make alternative arrangements for classes, assignments, and tests. Notice Regarding Possible Course Modification At certain points in the course it may make good sense to modify the schedule outlined below. The instructor reserves the right to modify elements of the course and will notify students accordingly (in class and on Avenue to Learn). Extreme Circumstances The University reserves the right to change the dates and deadlines for any or all courses in extreme circumstances (e.g., severe weather, labour disruptions, etc.). Changes will be communicated through regular McMaster communication channels, such as McMaster Daily News, A2L and/or McMaster email. Syllabus Part I: Single-Degree-of-Freedom (SDOF) Systems Reading from textbook Equations of Motion; Overview of Solution Methods Chapter 1 Free Vibration § 2.1, 2.2 Response to Harmonic Excitation; Transmissibility; Energy Dissipated in § 3.1, 3.2, 3.5, 3.6, 3.8, 3.9 Viscous Damping; Equivalent Viscous Damping Response to Arbitrary Force; Earthquake Excitation § 4.1 – 4.5 Numerical Evaluation of Dynamic Response § 5.1 – 5.4 Earthquake Response and the Response Spectrum Chapter 6 Part II: Multi-Degree-of-Freedom (MDOF) Systems Equations of Motion § 9.1 9.4, 9.9 9.11 Free Vibration Chapter 10: Parts A and B Dynamic Analysis and Response Chapter 12: Parts A and B Modal Analysis § 13.1, 13.2, 13.7, 13.8 Part III: Seismic Design Modeling Assumptions; Reduction of Degrees of Freedom § 15.1 15.3 Canadian National Building Code (NBC) Provisions § 22.2, 22.5 3 of 3
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