Translated Title

Pseudo-static Test Research on Mechanic Behavior of PHC Piles with Soil-pile Interaction

Translated Abstract

A　reciprocating　low-cycle　pseudo-static　test　in　view　of　prestress　high　concrete　(PHC)　pipe-pile　test　model　was　conducted　aimed　at　the　problem　that　conventional　design　and　calculation　of　Technical　Code　for　Building　Pile　Foundations　(JGJ　94　2008)　was　not　applicable　to　pile　foundation　of　integral　abutment　jointless　bridges　(IAJB).The　failure　characteristics,horizontal　displacements　along　pile　depth,strains,skeleton　curves　as　well　as　hysteretic　behavior　curves　were　developed　by　applied　horizontal　displacement　loads,embedded　strain　gauges　and　soil　pressure　cells.Then　the　mechanism　of　soil-pile　interaction　was　preliminarily　discussed,especially　by　designing　an　innovative　method　for　measuring　horizontal　displacements　of　piles　inside　the　soil.The　testing　results　show　that　the　prestress　degree　and　reinforcement　ratio　have　a　great　influence　on　the　failure　mode　of　PHC　pipe-piles　with　different　regularities　of　crack　distribution,development　of　maximum　moment　along　piles　and　the　redistribution　of　internal　force.Moreover,the　less　prestress　degree　and　reinforcement　ratio　are　the　poorer　ductility　and　interaction　perform　and　the　severer　damage　causes.The　effect　of　soil-pile　interaction　is　unsatisfactory　PHC　pipe-piles　show　a　linear　elastic　behavior　and　the　pile　bears　the　horizontal　external　load　at　the　preliminary　stage　of　loading.When　piles　crack　and　concrete　in　tension　area　fails　to　work,the　loading　rate　rises　slightly　with　obvious　nonlinearity.After　continuing　load,the　increment　of　load　is　mainly　born　by　soil　around　pile,and　when　the　pressure　of　soil　around　pile　reaches　the　peak,the　load　begins　to　decline　and　the　model　is　rapidly　damaged.The　piles　perform　the　favorable　plasticity　and　deformability,applying　to　the　pile　foundation　of　IAJB.The　larger　the　ductility　coefficient　is,the　better　the　seismic　performance　will　be.At　last,the　equivalent　stiffness　(ES)　calculating　method　of　PHC　pipe-pile　is　presented　with　providing　a　reference　to　the　code　of　pile　foundation　of　IAJB.

Translated Keyword

bridge engineering
mechanic behavior
PHC pipe-pile
reciprocating low-cycle pseudo-static test
soil-pile interaction

Classification

U441

Type

Project Name

Project No.

Access Number

WF:perioarticalzgglxb201704006

Language

Chinese

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