GEOL 2390 Study Guide - Radon, Deep Foundation
8 Nov 2012
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Mitigation lateral spread/flow failure: avoidance, zoning, excavation (if small: g n ral liqu faction/bearing strength loss: engineering designs: drainage, grouting, artificial compaction, deep foundation expensive! small area only. 50% more expensive result - most eq prone areas under coded. San fernando 1971: 90% of buildings collapsed exceeded building code. Caracas 1967: much new construction in previous 10 yr (i. e. modern build- ings) Most rigid code ater calif total collapse 5 high rise. Major structural damage 500 other 30 story buildings biggest upgrading problem. 30% of population lives/works in high risk zone: general: sufficient spacing no ornamentation rectangular vs. complex steel reinforced concrete, eq prediction/control, only within past decade last 5 years major advances but still elusive appraoaches, long-term analysis seismicity/recurrence rates. 120/yr 6-7m (area ~160,000 km2: problem: relies totally on length of data large data = good relationship small database = poor relationship, short term approach, study of precursors, key "event" that started modern investigation.
