000018738 001__ 18738
000018738 005__ 20170118182239.0
000018738 04107 $$aeng
000018738 046__ $$k2017-01-09
000018738 100__ $$aGibson, Rupert
000018738 24500 $$aReduction of Liquefaction-Induced Kinematic Pile Loading By Means of In-Ground Ringwall

000018738 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000018738 260__ $$b
000018738 506__ $$arestricted
000018738 520__ $$2eng$$aThis paper presents an approach to reducing liquefaction-induced kinematic loading on piles by means of an in-ground ringwall made of overlapping jet grout columns. A vulnerability assessment using Dynamic Soil-Structure Interaction (DSSI) analysis of the pile foundation of an existing liquefied petroleum gas (LPG) spherical storage tank has identified that the piles capacity will be exceeded during a design earthquake. Liquefaction assessment indicated that several soil layers may liquefy and create non-liquefied ‘crusts’ that impose additional lateral deformation along the length of the pile. The precast pre-stressed concrete piles had relatively low lateral capacity and were prone to bending failure during earthquake shaking. A retrofit study was performed to assess the effectiveness of an in-ground wall concept in minimizing the kinematic loads on the piles. The concept was to construct overlapping jet grout columns that form a ringwall that would deflect the kinematic loading of the non-liquefied ‘crusts’, shielding the brittle piles during earthquake shaking. To help select efficient ringwall configurations, several pushover analyses were performed varying the ringwall thickness and depth. Finally, the optimized ringwall configurations were incorporated into the full DSSI model and subjected to two orthogonal horizontal acceleration time histories. Results indicated that the in-ground ringwall greatly reduced the kinematic loading on the piles, and hence piles that once failed now perform within capacity. The DSSI analyses provided ‘proof of concept’ that shows inground walls reduce kinematic loading and can be used to retrofit the existing foundations.

000018738 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000018738 653__ $$adynamic soil-structure interaction; kinematic loading; pile foundations; liquefaction mitigation; petrochemical facilities.

000018738 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000018738 720__ $$aGibson, Rupert$$iLopez, Jorge$$iLubkowski, Ziggy$$iGo, James
000018738 8560_ $$ffischerc@itam.cas.cz
000018738 8564_ $$s944345$$uhttps://invenio.itam.cas.cz/record/18738/files/2120.pdf$$yOriginal version of the author's contribution as presented on USB, paper 2120.
000018738 962__ $$r16048
000018738 980__ $$aPAPER