Research Needs Assessment for Micropiles: The Past, Present and Future

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Presentation transcript:

Research Needs Assessment for Micropiles: The Past, Present and Future Gary M. Weinstein Research Fellow Polytechnic University Brooklyn, NY IWM 2003

Research Needs Identified in IWM 2002 Venice Design FOREVER Research - Must be applied - Utilization of WSU, State Pooled Fund, PANYNJ for research - Understanding of Case 2 micropiles with respect to seismic design - Design issues with battered micropiles - Connection details - Development of ductility and fixity conditions for Case 2 systems - Global stiffness prediction - Lateral/seismic load transfer - Certainty and risk assessment issues & costs Structural Geotechnical - Connection Details - Bending Moment Effects - Overall Structural Performance - S-P-S interaction - Scale effects - Group effects - Pile spacing/ geometry - Slenderness ratio/ construction method effects on system performance - Standardize FEA/FD - Dynamic – Load sharing and SSI design - CPT – construction effects on soil Economics - Are Case 2 systems viable? QA/QC - Test beds - PDA - CPT data on soil Design Standard for Case 2 Systems Other - Website / e-mail - Database / (skin friction and construction methods) Definition of a Group and Network? Definition of a Micropile? Stop and Think Before We Go Any Further What is the Framework for Implementation? Note: Text in yellow denotes research needs addressed per the MICROFOR proposal

- Research needs as identified in State-of-Practice Review Drilled and Grouted Micropiles Research Needs Assessment (Draft Final Report) Contract No. FHWA-DTFH 61-93-C-00128 July, 1995 Revisited - Research needs foreseen in original FHWA technical proposal (Sept., 1993) - Research needs as identified in State-of-Practice Review - Overview of FOREVER research plan - Proposal to conduct an integrated American micropile research program - Consolidated research needs assessment

MICROFOR Research & Integration Flow Chart Framework & Updated RNA – Case Study MICROFOR Research & Integration Flow Chart

Implementation – Case Study A Government-Industry-University Partnership for Research, Development, Testing and Performance Monitoring of Micropile Network Systems for Highway & Civil Infrastructure Applications

Dedicated to the Vision of Dr. Fernando Lizzi