Specifications for Specifications for Highway BridgesHighway Bridges

Masahiro Ishida

Public Works Research Institute

JAPAN

Specifications for Highway BridgesSpecifications for Highway Bridges (Japan Road Association)(Japan Road Association)

•Part I : Common design principles•Part II : Steel bridges•Part III : Concrete bridges•Part IV : Substructures•Part V : Seismic design

Discussing Discussing NEXT Design CodeNEXT Design Code

Performance Based Design CodeLimit State Design Partial Safety Factors

Hierarchy of performance-based codes

LEVEL 2Functional Statement

LEVEL 3Performance Requirement

LEVEL 1Objectives

LEVEL 5Deemed-to-satisfy

LEVEL 4

Performance-based method

Figure 3. Confidence level of 95 % (SPP in sand subsoil layers)

0 10 20 30 40 50 600

20

40

60

80

100

120

140

160

N blow count

f (k

N/m

2 )

z=10

z=5

z=3

Figure 4. Estimated modification factors for popular piling methods

Figure 5. Estimated modification factors for innovative piling methods

Estimated modification factors for popular piling methods

Estimated modification factors for innovative piling methods