EAS 140 Engineering Solutions Lecture #9 Civil Engineering Case Study

Announcements Reading for Civil Eng. Case Study: Jensen, section 4.5 and Chapters 5, 6, and 7 Reading for Lab 4: Laboratory Guide, Chapter on Charting Midterm: Friday, October 22nd, 6-8 pm Chemical Eng. Case study - due at Lecture 10

Civil Engineering In the good old days, everyone was civil Oldest engineering discipline In the good old days, everyone was civil American Society of Civil Engineers (ASCE) – 1852 Most diverse engineering discipline Tall buildings to highways to drinking water treatment Common threads: mechanics – solid or fluid engineered and natural systems mathematics

Civil Engineering Disciplines Structural engineering Geotechnical engineering Construction management Environmental engineering

Structural Engineering Creative use of: F = ma Intelligent approaches to uncertainty Engineering is the art of modelling materials we do not wholly understand, into shapes we cannot precisely analyse so as to withstand forces we cannot properly assess, in such a way that the public has no reason to suspect the extent of our ignorance. AR Dykes (1976)

Geotechnical Engineering Where structures touch the dirt Areas: soil mechanics foundation engineering engineering geology rock mechanics and rock engineering

Construction Management Management of materials, money, and people Areas: scheduling decision-making Web-based inspections

Environmental Engineering Analysis and design of natural and engineered systems Areas: drinking water treatment wastewater treatment environmental modeling water resources

Example: Earthquakes Structural engineers Geotechnical engineering design and implement passive/active control Geotechnical engineering soil liquification Construction management reconstruction with limited resources Environmental engineering lifelines – water, sewer

Civil Eng. Case Study Topic: Collapse of suspended walkways in the Kansas City Hyatt Regency hotel 10

Civil Eng. Case Study After the collapse: 10

Civil Eng. Case Study deck rod box beam stringer Anatomy of a Walkway: 12

Civil Eng. Case Study Nut/washer pulled through box beam: 13

Civil Eng. Case Study Case Study Question: Was the fourth-floor walkway designed properly? How did the capacity compare to the code? How did the capacity compare to the load? 13

Civil Eng. Case Study Case Study Questions: How did the change order affect the load on the weld? 13