Seismic Response of Secondary Systems Supported by Torsionally Yielding Structures

Substantial damage sustained during several recent earthquakes was non structural in nature. The economic consequence in terms of non structural component damage far exceeded the structural damage. Currently, there are several analytical studies that address the interaction between non structural components or Secondary systems (S-systems) and the main supporting structure or Primary system (P-system). Only a few of these analytical approaches have been proposed to evaluate and characterize the response of the S-systems attached to torsionally coupled P-systems. In addition, the experimental verification for the analytical approaches is scarce.

In the current study, the results and observations of an experimental research program conducted to characterize the behavior of both stiffness eccentric and mass eccentric torsionally coupled Primary-Secondary systems (PS-systems) are presented. From this experimental investigation it was found that the torsional yielding of the primary system has significant implications on the deamplification of near tuned secondary system response. The location of the S-system mounted on the P-system affects the peak response amplification, and interaction with the coupled P-system.     

Iraq: Past,Present and Uncertain Future: a Review Essay

Dancing with Saddam: The Strategic Tango of Jordanian‐Iraqi Relations. David Schenker. Lanham, MD Dark Victory: America's Second War against Iraq. Jeffrey Record. Annapolis, MD Ignorant Armies: Sliding into War in Iraq. Gwynne Dyer. The Gulf War Chronicles: a Military History of the First War with Iraq. Richard S. Lowry. The Iraq War: a Military History. William Murray and Major General Robert H. Scales, Jr. The Iraq War: Hidden Agendas and Babylonian Intrigue, the Regional Impact on Shi'ites, Kurds, Sunnis and Arabs. Raphael Israeli. The Modern History of Iraq, 2nd. ed. Phebe Marr. Boulder The New Iraq: Rebuilding the Country for Its People, The Middle East, and the World. Joseph Braude.