00822723

Component

https://doi.org/10.3141/1772-10

http://scholar.google.com...usta&publication_year=2001

Presented is a three-dimensional finite element analysis of the seismic behavior of micropiles used in engineering applications, such as construction in earthquake areas, and seismic retrofitting of structure foundation and retaining systems. It is composed of two parts. The first is concerned with analysis of the seismic behavior of a single micropile supporting a superstructure; results obtained with three-dimensional finite element modeling are compared to those obtained from a simplified model based on the Winkler approach. The second part includes a study of the seismic behavior of groups of micropiles. Numerical simulations are conducted to study the variation of the group effect with the variation of micropile spacing, number of micropiles, and the position of the micropile in the group. Analysis of results of numerical simulations shows that the presence of the superstructure induces significant inertial effect, which causes a high increase in the bending moment in the upper part of micropiles; the inertial effect depends mainly on the loading frequency with respect to the fundamental frequency of the soil layer and that of the superstructure. A group effect is observed in groups of micropiles connected by a rigid cap. The group effect depends mainly on micropile spacing, number of micropiles, and position of micropiles in the group. Results show an increase in moment at the head of micropiles with the increase of the micropile spacing (presence of inertial effect) and a concentration of seismic loading on corner micropiles.

This paper appears in Transportation Research Record No. 1772, Soil Mechanics 2001.

English

p. 84-90

2001

Transportation Research Record

0309072360

Figures (8) ; References (13) ; Tables (4)

Bending moments; Earthquake resistant design; Earthquake resistant structures; Finite element method; Inertia (Mechanics); Pile foundations; Pile groups; Positioning; Retrofitting; Soil structure interaction; Spacing

Micropiles

Geotechnology; Highways; I42: Soil Mechanics

TRIS, TRB

Jan 24 2002 12:00AM

• CLASS-A PREDICTION OF CONSTRUCTION DEFECTS IN DRILLED SHAFTS
• EFFECTS OF MINOR ANOMALIES ON AXIAL CAPACITY OF DRILLED SHAFTS
• ENGINEERING ANALYSIS OF DYNAMIC BEHAVIOR OF MICROPILE SYSTEMS
• ESTIMATING HIGHWAY EARTHWORK CROSS SECTIONS BY USING VECTOR AND PARAMETRIC REPRESENTATION
• EXAMINING THE EFFECTS OF REINFORCEMENT IN U.S. FOREST SERVICE DEEP-PATCH LANDSLIDE REPAIR TECHNIQUE: FULL-SCALE MODEL TESTS
• FAILURE OF GEOTEXTILE-REINFORCED VERTICAL SOIL WALLS WITH MARGINAL BACKFILL
• FIELD INSTALLATION OF AN EARTH PRESSURE CELL
• GEOCOMPOSITE CAPILLARY BARRIER DRAIN SYSTEM WITH FIBERGLASS TRANSPORT LAYER
• IN SITU MEASUREMENT AND EMPIRICAL MODELING OF BASE INFILTRATION IN HIGHWAY PAVEMENT SYSTEMS
• INSTALLATION SURVIVABILITY OF FLEXIBLE GEOGRIDS IN VARIOUS PAVEMENT SUBGRADE MATERIALS
• INSTRUMENTATION AND CONSTRUCTION PERFORMANCE MONITORING FOR I-15 RECONSTRUCTION PROJECT IN SALT LAKE CITY, UTAH
• LATERALLY LOADED DRILLED SHAFTS EMBEDDED IN SOFT ROCK
• LIMIT STATES AND FACTOR OF SAFETY IN DESIGN OF AN ANCHORED SHEET PILE WALL
• LIZZI'S STRUCTURAL SYSTEM RETROFIT WITH RETICULATED INTERNAL REINFORCEMENT METHOD
• MODELING PAVEMENT SUBDRAINAGE SYSTEMS
• MONITORING THE EFFECTS OF A DEEP EXCAVATION ON TWO ADJACENT OFFICE BUILDINGS
• PERFORMANCE OF GEOCOMPOSITE MEMBRANE AS PAVEMENT MOISTURE BARRIER
• QUALITY ASSURANCE PROCEDURE TO ASSESS MAINTENANCE ADEQUACY OF DRAINAGE ASSETS
• RATIONAL BASIS FOR EVALUATION AND DESIGN OF PAVEMENT DRAINAGE LAYERS
• REAL-TIME MONITORING OF SUBSIDENCE ALONG I-70 IN WASHINGTON, PENNSYLVANIA
• REPEATABILITY AND RELIABILITY OF THE TUBE SUCTION TEST
• STRAIN WEDGE MODEL HYBRID ANALYSIS OF LATERALLY LOADED PILE GROUP
• STUDY OF SCALP-AND-REPLACE EQUATION IN COMPACTION SPECIFICATION FOR SOIL WITH HIGH GRAVEL CONTENT
• USE OF DISCRETE EVENT SIMULATION TO DESIGN GEOCOMPOSITE MEMBRANE INSTALLATIONS