SeungKyu Nam nsk0201@midasit.com

Post-tensioned PSC Box Girder Bridge using FCM as per Eurocode 13 February 2018

Learning Objectives

• Basic procedure of designing segmental bridges

• Manual method of modeling

• Modeling using Wizard

• Checking Results and Design Report

Introduction

Bridge type: Curved balanced cantilever bridge

Horizontal & Vertical alignments • Importing .dxf file • Super elevation: Continuous variation from 0 to 5 ͦ • 20 m pier height

Top View

Side View Front View

Geometry

Tapered Section with polynomial variation

Tapered Section

Superelevation

Beta angle

0

Modify B-Angle from element table

Time dependent material properties

Creep & Shrinkage

Compressive Strength

Tendon

Internal (Pre-Tension)

Internal (Post-Tension)

External (Post-Tension)

Tendon

Tendon Template

PSC Value sections UK code DB

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

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

Add

AutoGeneration

Tendon template

Tendon profile generator AutoCAD .dxf file import

Construction Stage

Define duration and additional step for each stage Define activation of elements Activate boundary conditions Activate and deactivate load as per construction schedule

Traffic Load

Step 1

Moving Load Code

Step 2

Traffic Line Lane or Traffic Surface Lane

Step 3

Standard Vehicle or User-defined Vehicle

Vehicle from database and automatic consideration of adjustment factor

Traffic Load: Load Model 1 vehicle

Vehicle from database and automatic consideration of Ψ factors

Traffic Load: Load Model 1 vehicle

Traffic Load: Load Model 3 vehicle

Traffic Load: Load Model 3 vehicle

Traffic Load: Moving Load Case

Temperature Load

Seasonal Temperature: Element / System / Nodal Temp. Temperature Gradient: Temp. Gradient, Beam Section Temp.

Results

Deflections & deformed shape Reactions in nodes

Forces and stresses in elements Moving load tracer result Tendon loss result

Results

Top fiber Bottom fiber

Design Report

Select the desired ULS and SLS

Enter the Partial Factors

Flexure Design

Torsional Design

Shear Design

Practical Features: Effective Width Calculation / FCM Camber Control

Effective Width Calculation FCM Camber Control

Practical Features: Transverse Analysis Model Wizard

Selection Load Tendon

10

midas Civil Demonstration

Program Demonstration

Modeling feature comparison

Manual Method

• Define material and section properties

• Structural modeling

• Define and compose Structure Group

• Define and compose Boundary Group

• Define and compose Load Group

• Load input

• Tendon arrangement/prestressing

• Define construction stages

• Define Time Dependent Material Properties

• Perform Analysis

Wizard Method

• Define material and section properties

• FCM Wizard

• Define and Time Dependent Material Properties

• Perform Analysis

Tips: How to check section properties of tapered section?

Tips: Analysis result for tapered section

Node

• Analysis results are calculated at the neutral axis of the section (perpendicular to the neutral axis)

10

Tips: Reinforcement

Tips: Tendon Elongation

• Theoretical tendon elongation ranges are calculated and can be provided as a reference material during the construction procedure.

Q & A

Thank You ! For any questions, feedback and suggestions send an e-mail at: uksupport@midasuser.com

THANK YOU !

For any questions, feedback and suggestions send an e-mail at: uksupport@midasuser.com