V.761 Release Note - 台灣邁達斯 · PDF file... as per IRC:18-2000 ... Addition of torsional design of RC beam as per TWN ... •Creep function can be shown as “creep strain

V.761 Release Note

Enhancements

Pre/Post-Processing

• Addition of Pile Spring Supports

• Addition of upside-down T-shape beam

• Improvements in IS84 section DB

• and much more…

Analysis part

• Addition of Time Dependent Material (Creep/Shrinkage, Compressive Strength and Tendon Loss) as per Eurocode2:04

• Addition of Time Dependent Material (Creep/Shrinkage, Compressive Strength and Tendon Loss) as per IRC:18-2000


Design part

• Addition of torsional design of RC beam as per TWN-USD92

• Addition of steel code checking as per IS:800-2007


midas Gen V.741 R2 Release Notemidas Gen V.761 Release Note

Pre & Post processing

(1) Addition of Pile Spring Supports

(2) Addition of upside-down T-shape beam

(3) Improvements in IS84 section DB

(4) Addition of Chinese section DB: GB-YB05

(5) Improvements on the Display of Supports and Point Spring Supports

(6) Save an image in jpg format

(7) Addition of an export option in result tables

(8) Addition of the Preference in online help

(9) Addition of auto-generation of wind loads

according to the latest Korean Building Code (KBC2008)

(10) Addition of static and dynamic seismic loads


midas Gen V.761 Release Note

Enhancements

Copy right (c) 1989~2009 MIDAS Information Technology Co., Ltd. All rights reserved.

(1) Addition of Pile Spring Supports

• Pile spring support can consider the soil adjacent to piles as nonlinear springs. Nonlinear

characteristics of springs over the pile height are automatically varied.

• Linear, compression-only and Multi-Linear springs are automatically assigned to nodes

depending upon the spring direction.

• By selecting the pile elements and entering geometry data (ground level, pile diameter,

etc.) and soil properties, the spring stiffness at each node is automatically calculated.

Upgrade Contents

Model > Boundaries > Pile Spring Supports

Pre/Post-Processing

Linear type

Point Spring Support

Model > Boundaries > Point Spring Support Table

Multi-Linear type

Point Spring Support


Enhancements


The relationship between the lateral soil resistance and the

lateral displacement Y at a specific depth X is represented as

shown in the left figure.

The values of Pk, Pm, Pu, Yk, Ym and Yu are defined at a

specific depth (i.e., where pile springs are).

The method of calculating Pu varies with Soil Types. The

values of Pk, Pm, Yk, Ym and Yu are calculated using Pu as

explained below.

The calculation method is divided into two major cases -

Sand and Clay. Different J values are used for Soft Clay and

Stiff Clay, respectively.

The Stiffness of Nonlinear Elastic (Lateral) Springs for the Soils adjacent to Piles

a. Calculation of Pu in case of Sand Soil

The value of Xt denotes the depth when the following two Pu values are equal. Make the right

terms of two equations equal, rearrange the equation in terms of X and solve the quadratic

equation.

) ti X X ) tii X X

1 2 3 4[ ]u rP A X c c c c 5 6[ ]uP AD c c

0

1

tan sin

tan( )cos

K Xc

2

tan( tan tan )

tan( )c D X

3 0 tan (tan sin tan )c K X

4 ac K D

8

5 (tan 1)ac K rX

4

6 0 tan tanc K rX

Where, : Ultimate soil resistance per unit length : Angle of internal friction of sand

: Empirical adjustment factor :

: Depth below soil surface :

: Pile diameter : Unit weight of soil

: Coefficient of earth pressure at rest : Active earth pressure coefficient

uP

A

X

D

0KaK

2[tan (45 / 2)]

/ 2

45 / 2


Enhancements


b. Calculation of Pu in case of Clay Soil

c. Computation of Points k and m

[3 / ]u u uP D s rX Jc X D

9u uP s D

RX X

RX X

uP

us

uc

D

J

X

RX 6 /[ / ]uD s J

Where, : Ultimate resistance per unit length : Pile diameter

: Undrained shear strength : Empirical constant (0.5 for Soft Clay, 0.25 for Stiff Clay)

: Undrained cohesion : Depth below soil surface

: Unit weight of soil :

for

for

3

80u

DY

60m

DY

m u

BP P

A

/(1 )

1/1

n n

n

m

DPmYk

k XY

1( / )k kP X D k Y

,A B

[ ( )]/[ ( )]m u m m u mn P Y Y Y P P

1k

Where, : Empirical adjustment factor

: Constant varying with relative density

Relative Density

Loose 5.43

Medium 16.29

Dense 33.93

2

1( / / )k MN m m

d. Spring Stiffness

The final spring stiffness is determined by multiplying the stiffness per unit area calculated above

by the area.

u uP P A m mP P A k kP P A


Enhancements


Where, : Pile diameter : Coefficient of earth pressure at rest

: Unit weight of soil : Depth below soil surface

: Internal friction angle

The Stiffness of Linear Elastic (Vertical) Springs for the Soils adjacent to Piles

The direction of the linear elastic vertical springs for the soils adjacent to piles should be

perpendicular to the ground (GCS '-'Z direction). Even though the piles are not perpendicular to the

ground, the z-direction (Node Local Axis) of the nodes for Piles should coincide with the GCS Z-

direction.

tan 0 tanK D K

tan (1 sin ) tanK D X

D

0K

X

For Sand

For Clay


Enhancements


(2) Addition of upside-down T-shape beam

• Generate the strip foundations using upside-down T-shape beam.

• Both upside-down T-shape and L-shape section can be generated.

Upgrade Contents

Model > Properties > Section

Tables >Structure Tables > Properties>Section

Pre/Post-Processing

Upside-down T-shape section L-shape section


Enhancements


(3) Improvements in IS84 section DB

• In IS84 section DB, H-Section and Channel now reflect „r‟ value.

• T-Section has been newly added as per IS84.

Upgrade Contents


Pre/Post-Processing


Enhancements


(4) Addition of Chinese section DB: GB-YB05

• Chinese section DB (GB-YB05) has been newly added.

Upgrade Contents


Pre/Post-Processing


Enhancements


(5) Improvements on the Display of Supports and Point Spring Supports

• A new feature that displays the Support and Point Spring Support offering an intuitive

way of identifying boundary conditions.

Upgrade Contents

Model > Boundaries > Define Constraint Label Direction

View > Display > Boundary

Old version

Ver.761

Pre/Post-Processing

Support Point spring support


Enhancements


(6) Save an image in jpg format

• Graphic data of the Model Window can be saved in jpg format as well as AutoCAD DXF,

BMP or EMF.

Upgrade Contents

File > Graphic files > JPG files

Pre/Post-Processing


Enhancements


(7) Addition of an export option in result tables

• New feature that can export databases to an Excel Spreadsheet.

Upgrade Contents

Results > Result Tables

Pre/Post-Processing


Enhancements


(8) Addition of the Preference in online help

• The user can select a Local Help or Web-based Help in the preference.

• When „Use Local Help‟ option is checked on, a Local help file (midasGen.chm) which has

been installed in the local computer is invoked by pressing „F1‟ key.

• Default setting is check-off, which invokes a Web-based Help. Since Web-based Help

can be frequently updated, default setting is recommended.

Upgrade Contents

Tools > Preferences > Environment

Pre/Post-Processing

[Web-based Help]


Enhancements


Rigid Structure

Flexible Structure

(9) Addition of auto-generation of wind loads


• Auto-generation of wind loads according to KBC 2008 is newly implemented.

• In KBC2005, Gust Effect Factor was determined based on the Roughness in the

corresponding table for the rigid frame. In KBC 2008, it is calculated from the equation.

Upgrade Contents

Load > Lateral Loads > Wind Loads

Pre/Post-Processing


Enhancements


(10) Addition of static and dynamic seismic loads


• Static seismic load and design response spectrum according to KBC 2008 have been

newly added.

Upgrade Contents

Load > Response Spectrum Analysis Data

> Response Spectrum Functions

Load > Lateral Loads

> Static Seismic Loads

Pre/Post-Processing

midas Gen V.741 R2 Release Notemidas Gen V.761 Release Note

Analysis

(1) Addition of Time Dependent Material (Creep/Shrinkage, Compressive

Strength and Tendon Loss) as per Eurocode2:04

(2) Addition of Time Dependent Material (Creep/Shrinkage, Compressive

Strength and Tendon Loss) as per IRC:18-2000

(3) Addition of the Time Dependent Material (Compressive Strength)

as per CEB-FIP(1978)

(4) Addition of distributed springs

(5) Transfer reactions of slave nodes to the master node

(6) Addition of Sturm Sequence Check and Load Factor Range option in

Buckling analysis

(7) Improvements on the Eigenvalue analysis considering the maximum number

of frequencies

(8) Improvement on FEMA type pushover hinge properties

(9) Considering buckling load in the Pushover Yield Surface

Design

(1) Addition of torsional design of RC beam as per TWN-USD92

(2) Addition of steel code checking as per IS:800-2007

(3) Improvement in calculating effective length in the steel structure

according to the Chinese specification

(4) Auto-generation of load combination as per KBC 2008


Enhancements


(1) Addition of Time Dependent Material (Creep/Shrinkage, Compressive Strength and

Tendon Loss) as per Eurocode2:04

• Time Dependent Material (Creep/Shrinkage, Compressive Strength and Tendon Loss) as

per Eurocode2:04 is newly implemented.

Upgrade Contents

Model > Properties > Time Dependent Material(Creep/Shrinkage)

Model > Properties > Time Dependent Material(Comp. Strength)

Load > Prestress loads > Tendon Property

Analysis

Creep/Shrinkage

Compressive Strength Tendon Loss


Enhancements


(2) Update on Time Dependent Material (Creep/Shrinkage, Compressive Strength and

Tendon Loss) as per IRC:18-2000

• Time Dependent Material (Creep/Shrinkage, Compressive Strength and Tendon Loss) as

per IRC18:2000 is newly implemented.

• Creep function can be shown as “creep strain per 10MPa” as well as “Creep Coefficient”.

Upgrade Contents

Analysis

Creep/Shrinkage

Compressive Strength Tendon Loss

Model > Properties > Time Dependent Material(Creep/Shrinkage)

Model > Properties > Time Dependent Material(Comp. Strength)

Load > Prestress loads > Tendon Property


Enhancements


(3) Addition of the Time Dependent Material (Comp. Strength) as per CEB-FIP(1978)

• Time Dependent Material (Compressive Strength) as per CEB-FIP(1978) is newly

implemented.

Upgrade Contents

Model > Properties > Time Dependent Material (Comp. Strength)

Analysis


Enhancements


(4) Addition of distributed springs

• Distributed springs on the beam, plate and solid elements

• Generate surface springs to represent the stiffness of the soil.

• Consider accurate boundary conditions when modeling members on elastic subgrade.

• Compression-only spring can be considered.

Upgrade Contents

Model > Boundaries > Surface Spring Supports

Analysis

Difference between Convert to Nodal Spring and Distributed Spring

When Convert to Nodal Spring is selected, springs are entered at the nodes of the

elements. When Distributed Spring is selected, springs are uniformly distributed on a

face or edge of the elements.

Convert to Nodal

Spring

Distributed Spring

(Winkler Spring)

Spring location Nodes of elements Distributed on the elements

Unit of

reactionkN

Beam: kN(kN/M)

Planar or Solid: kN(kN/M2)

DeformationConcentrated at the

nodes

As element stiffness increases,

deformations are distributed throughout the

elements.

[Surface Spring Supports Display]

[Reaction (Local-Surface Spring )tab]


Enhancements


(5) Transfer reactions of slave nodes to the master node

• In the old version, reactions were produced at the master node only when rigid links were

assigned. In Gen V761, the user can select if reactions of slave nodes are transferred to

the master node or not.

Upgrade Contents

Analysis > Main Control Data > Transfer Reactions of Slave Nodes to the Master Node

Analysis

[Checked off - When reactions of slab nodes are

not transferred to the master node]

[Checked on - When reactions of slab nodes are

transferred to the master node]


Enhancements


Analysis

(6) Addition of Sturm Sequence Check and

Load Factor Range option in Buckling analysis

• Sturm Sequence Check option for detecting any missed buckling load factor and Load

Factor Range option for setting the range of the buckling load factor have been newly

added.

Upgrade Contents

Analysis > Buckling Analysis Control

[Message window]

[Buckling mode shape]

[Buckling mode shape table]

1st 2nd 3rd


Enhancements


(7) Improvements on the Eigenvalue analysis

considering the maximum number of frequencies

• When the Number of Frequencies exceeds the maximum number of eigenvalues for a

corresponding structure, the program automatically updates the number of frequencies.

In the old version, error message was displayed and analysis was terminated.

Upgrade Contents

Old version Ver.761

Analysis > Eigenvalue Analysis Control

Analysis


Enhancements


(8) Improvement on FEMA type pushover hinge properties

• In the old version, M/MY at the point D and E must have the same value. In Gen V761,

different values can be defined. It is applicable when the Interaction Type is „None‟ and

Input Method is „User Input‟.

• This function is implemented to support the integration between SERCB win and midas

Gen.

Upgrade Contents

Design > Pushover analysis > Define Pushover Hinge Properties

Analysis

[Pushover analysis result in Gen]

[SERCB win]


Enhancements


(9) Considering buckling load in the Pushover Yield Surface

• In the pushover PMM hinge properties, buckling load can be considered by checking on

the „Calc. Yield Surface of Beam considering Buckling‟ option.

Upgrade Contents

Design > Pushover > Pushover Global Control

Analysis


Enhancements


(1) Addition of torsional design of RC beam as per TWN-USD92

• Torsional design as per TWN-USD92 has been newly added.

• Torsional design results can be exported to DShop.

• The user can specify Torsion reduction factor in the Concrete Design Code dialog.

Upgrade Contents

Design > Concrete Design Parameter > Design Code (TWN-USD92)

Design > Concrete Code Design > Beam Design

Design > Concrete Code Design > Beam Checking

Design

[Graphic Report]


Enhancements


(2) Addition of steel code checking as per IS:800-2007

• Steel code checking and auto-generation of load combination as per IS800-2007 has

been newly implemented.

Upgrade Contents

Design > Steel Design Parameter > Design Code

Design

Design > General Design Parameter > Unbraced Length(L,Lb)

Design > General Design Parameter > Limiting Slenderness Ratio

Design > General Design Parameter > Equivalent Uniform Moment Factor (Cm)

Design > Steel Design Parameter > Partial Safety Factor

Design > Steel Design Parameter > Equivalent Moment Factor (CmLT)


Enhancements


(3) Improvement in calculating effective length in the steel structure according to the

Chinese specification

• Improvement in calculating effective length in the steel structure according to the

Chinese specification

Upgrade Contents

Design > General Design Parameter > Unbraced Length

Old version

A. Braced frame

B. Unbraced frame

Ver.761

A. Braced frame

B. Unbraced frame

Design


Enhancements


(4) Auto-generation of load combination as per KBC 2008

• Auto-generation of load combination as per KCI-USD07 has been newly updated to

KBC-USD08.

Upgrade Contents

Results > Combinations

Concrete Design Footing Design

Design

Documents

V.761 Release Note - 台灣邁達斯 · PDF file... as per IRC:18-2000 ... Addition of torsional design of RC beam as per TWN ... •Creep function can be shown as “creep strain