poland mbm_pc composite and psc box girder bridge design_final

HyeYeon Lee midas IT

Poland

2015

MIDAS

TECH TALKPC Composite and PSC Box Girder Bridge Design

Poland

2015

HyeYeon Lee midas IT

Poland

2015

MIDAS

TECH TALKPC Composite and PSC Box Girder Bridge Design

1. PC Composite Girder Bridge Design

2. Modeling Features of PSC Box Girder

3. Practical Analysis and Design of PSC Box Girder

Poland

2015

MIDAS Information Technology Co., Ltd. 4

Modeling of Composite Girder

Plate + Beam Model All Plate Model

Grillage Beam Model



What is grillage model

Structure is idealized as a number of

longitudinal and transverse beam

elements in a single plane, rigidly

interconnected at nodes.

Grillage mesh

(a) Grid of longitudinal and transverse

beams

(b) Longitudinal beams at center a little less

than lane width

(c) Deck with contiguous beam

(d) Two longitudinal members per larger

beam

Structural Analysis for Grillage Bridge



Spacing of Transverse Beams

1/4~1/8 of the effective span

Generally 1.5 times of the spacing of the longitudinal members

Spacing of Longitudinal Beams

1/4~1/10 of the effective span

Less than 2d or 3d

Direction of Transverse Beams

Modeling of Grillage Model



Flexural stiffness (Iyy)

Shear area (Asz)

Grillage Modeling Separate model for calculating Iyy

Grillage Modeling Separate model for calculating Asz

Modeling of Cross Frame



Torsionless Design

Torsion constants of PC I-girder: 1/10 of bending inertias

Torsion constants of steel composite girder: 1/60 of bending inertias

=> Simplify model by ignoring torsion effect in a safe manner

PC I-Girder Steel Plate Girder

Modeling of Grillage Model



Types of 3D model

(1) All Plate model

(2) Deck (Plate element) + Girder (Beam element)

(3) Deck (Plate element) + Girder top & bottom flange (Beam element) + Girder web

(Plate element)

Plate + Beam Model All Plate Model

Modeling of 3D Model



Purpose of Bracing

(1) Assists construction

(2) Restrain the bottom flange where they are in compression near

intermediate supports

Bracing type

Single Beam

X-Bracing

K-Bracing

Modeling of 3D Model



Advantage of 3D Model

(1) Automatically account for shear lag (dependent on the fineness of the mesh)

(2) Concrete slab that is cracked in longitudinal tension can be modeled

(3) Effective moment, shear, axial force on composite beam section can be

determined from the stresses

(4) Verification buckling resistance is available.

(5) Large displacement analysis is available.

(6) More realistic model by considering bracing

Local Direction Force Sum

Modeling 3D Model



Comparison between grillage model and 3D model

Items Grillage model 3D model

Analysis Time Short Long

Checking the member forces Easy (Beam force diagram)Complex (Resultant force from meshed

plate elements)

Accuracy Less accuracy

High accuracy

(Considering Warping stress, shear

force about longitudinal direction in

slab )

Cross Frame Considering as a Single beamConsidering either Single beam or 3D

bracing

Nominal Member

Required

(at the end of slab in longitudinal

direction)

Not required

Applicable bridge type Beam and Slab type bridge deck only Any type of bridges

Transverse beam Required Not required

Torsionless Design Optional Not required

Modeling of Composite Girder Bridge



Composite Sections

Various Section Properties



Quick Generation of General Composite Section



Composite I-Girder Composite Section for Construction Stage

Modeling of Composite Girder



Three Modeling Method for Composite Section


Method 1 Method 2 Method 3

Sequential Analysis +

Accurate Time Dependent Material

Sequential Analysis +

Long-term Modular Ratio of 3n

Composite Action

without Sequential Analysis


Tendon Template



Tendon Template Tendon Profile

PSC Value sections UK code DB

( UK-M, UK-SY, UK-TY, UK-TYE,

UK-U, UK-Y, UK-YE )

Add

AutoGeneration

Easily Generated Tendon Profile

Tendon Template



Considering Reinforcement of Deck in Analysis and Design



Resultant Force Diagram



Steel Composite Girder Bridge Wizard


Layout : Defining the basic geometry of a bridge• Girder Type and Modeling Type• Bridge Alignment• Span• Substructure• Boundary Condition

Section : Defining the section and location of deck, bracing and girder• Transverse deck element• Bracing• Girder

Load : Defining the Dead and live Load conditions• Before and after composite dead loads• Live loads

Construction Stage : Defining the detailed construction sequence• Construction stage• Reinforcement of Deck


Different Support Skew and bracing type

Composite Steel Tub model

All PlateDeck as Plate

Deck & Web as Plate

Construction Stage with Deck pouring Sequence

Tapered Girder section



Select the desired Ultimate Limit States

Enter the Partial Factors and Parameters

Optimized Design as per EN1992-2


Select the desired Service Limit States



Design Parameter Shear Resistance



Bridge Wizard for PSC Box Girder Bridge

Suspension Bridge Wizard

Cable Stayed Bridge Wizard

ILM Bridge Wizard

FCM Bridge Wizard

MSS Bridge Wizard

FSM Bridge Wizard

RC Frame/

Box Culvert Wizard

RC Slab Bridge Wizard

Grillage Model Wizard

Transverse Analysis Model Wizard

Segmental Bridge Model Wizard

PSC Bridge Wizard

2. Modeling Features for Practical Analysis


Balanced Cantilever Method Bridge Wizard


Bridge Layout Tapered Sections Tendons


Web TendonsFlange TendonsBridge Layout

Incremental Launching Method Wizard



Full Staging and Movable Scaffolding Wizard

FSM Wizard MSS Wizard



Transverse Analysis Wizards

Selection Load Tendon



Various Built-in PSC Sections



User Defined Section Generation

Define any sectional shape using SPC



Automatic Generation of Tapered Section



PSC Reinforcement

Shear Reinforcement

Strengthening Effect by shear reinforcement

and shear bars

Enclosing Stirrup for Torsional Strength

Longitudinal Reinforcement

Transformed Section

Confinement Effect by Creep

Considered in PSC Design



• Typical tendon : Defines lumped

representative tendon. Only one

tendon profile is defined at the

centroid of the all the tendons. It is

multiplied with number of tendons at

the time of analysis.

• X Axis Rot Angle: The tendon placed

in the table is rotated about its local

x-axis by the specified angle. Useful

while placing tendons on inclined

webs.

Tendon Profile Generation



Tendon Profile Generation

Draw Tendon Profile using CAD

Import DXF file through Tendon

Profile Generator

Import Tendon Profile



Moving Load Tracer

Step 1

Moving Load Code

Step 2

Traffic Line Lane or Traffic Surface

Lane

Step 3

Standard Vehicle or User-defined

Vehicle




Vehicle Load


Seasonal Temperature- Element Temperature- System Temperature- Nodal Temperature

Temperature Variation- Beam Section Temperature- Temperature Gradient

Effects of Temperature Distribution and Restraint Conditions

Temperature Loads



Time Dependent Materials

Material Code

Eurocode

CEB-FIP (1990)

CEB-FIP (1978)

ACI

PCA

Combined (ACI&PCA)

AASHTO

IRC 18

User Defined

Creep & Shrinkage Compressive Strength



Time Loads for Construction Stage

• Impose Time Load to

specific members to reflect

the time dependent material

properties relative to the

contiguous members.



Maximum Bending Moment

Envelope upon Completion

Minimum Bending Moment

Envelope upon Completion

Bending Moment Diagram for Each Construction Stages



Primary and Secondary Forces



Node Tip Deflection



Bridge Girder Diagram

Bridge Girder Diagram



Sig-xx, Position 1

Sig-xx, Position 9

PSC Beam Stress Diagram



Tendon Loss Table and Graph



Tendon Stress Limit Check



FCM Camber



Element Properties at Each Stage

- Age of Element

- Elastic Modulus

- Shrinkage Strain

- Creep Coefficient

Beam Section Properties at the Last

Stage

- Transformed Section Properties

- Neutral Axis Position Change

Section Properties at Each Stages



PSC Design

Bridge Load Rating Design

Composite Plate Girder Design

Structural Steel Design

Reinforced Concrete Design

SRC Design

AASHTO-LRFD02

AASHTO-LRFR

EN 1994-2

SSRC79

AIJ-SRC01

JGJI38-01

AIK-SRC2K

TWN-SRC92

AASHTO-LFD96

ACI318-02

CSA-S6-00

EN 1992-2

JTG D62-04

JSCE02

KSCE-USD05

KSCE-RAIL-USD04

JTJ023-85

IRC:21-2000

KCI-USD99

KSCE-USD96

TWN-BRG-LSD90

EN 1993-2 (new in 2012)

AASHTO-LRFD02

AASHTO-LFD & ASD96

AISC-LRFD2K

AISC-LRFD93

AISC-ADS89

BS5950-90

JTJ025-86

IS:800-2007

KSCE-ASD96

TWN-BRG-LSD90

TWN-BRG-LSD90

AASHTO-LRFD08



Select PSC Design Results

PSC Design as per Eurocode2-2:2005

Select Tendon / Bridge / Construction types



Cross section stress design results table



Design Report (EXCEL compatible)

Design Parameter

Flexural Resistance



Design Report


Thank you!

poland mbm_pc composite and psc box girder bridge design_final

Documents