Construction of Data-Base for High-capacity Micro-pile method

Yoshinori Otani,P.E. ｊ p

Hirose & Co., Ltd.

Prof. Masaru Hoshiya

Musashi Institute of Technology

Aug.27th 2004

IWM ’04 Tokyo

Contents

• Purpose of the Data-Base

　 　　 Background 　• Frame of the Data-Base

• Challenges • Summary 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　

Purpose of the Data-Base

Design Optimization　　　　　　　　

Gathering,Sharing and Communication

for Technical Information of HMP

• Bearing Capacity Characteristics• Seismic Performance• Deformation Performance

Background(1)Difference of Design Codes

Fig.1 Comparison of Design Bond Stress between Highway Bridge and Rail-road Bridge

Experiences of HMP in Japan

0

0.1

0.2

0.3

0.4

10 20 30 40 50

SPT N- value（ ）

Des

ign　

Max

imum

　Bon

dStres

s(N/m

m2)

HighwayBridgeRailroadBridge　

Background(2)Seismic Performance of MP

Fig.1 Damage under the Kobe-Earthquake Comparison of between reinforced wall by MP and non-reinforced wall

Frame of the Data-Base

Fig. Frame of the Data-Base System

1)Basic Data • Engineering 　 Evaluations• Market 　 Analyses 　• Reliability Study• Develope new technology

　　　　　　　　　　　　　 Basic Data Formation of structures and piles Design,Construction data Ground condition of the Existing Works

2)Bearing Capacity Characteristics

Loading Test in-situ of HMP Loading Test Result (load-displacement curve) on HMP

• Load factor Design Method on Performance Design 　 Design safety index, Partial safety factor,

Coefficient of variation

　　　　　　　　　　　　　 　 　 　 Code Calibrations

Limit state, Performance function

　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　

3)Seismic Performance

Measurement by Acceleration 　 Seismographs

Research of the structures received damage by Earthquake

4)Deformation Performance

Fig. Displacement Analysis of Pile

Photo. Deformation on the head of HMPTakenaka 　 Corporation

Uncertainties　　　　　　　deformation　performance　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　deformation　analysis　

Research　deformation　conditions　　　　　　　　　　　　　　　associated　with　changes　in　loading　history　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　over　long　periods　

Challenges

• Developing tools for collecting data• Managing proprietary rights in data attributable to

organizations• Integrating data

formats 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　　 　 　

Summary It is urgently necessary to construct a Limit State

Design Method incorporating reliability techniques in the process of transition towards Performance Provision Design.

Data to be collected for optimizing designs are thought not only to serve as simple mathematical statistic works but also to be used as materials for geo-technical verification. It is hoped that in the future these databases will be available for differing ground characteristics and regions and contribute towards internationally integrated design standards.