Release Date : Aug. 2016 Product Ver. : Gen 2017 (v1.1

DESIGN OF General Structures I n t e g r a t e d D e s i g n S y s t e m f o r B u i l d i n g a n d G e n e r a l S t r u c t u r e s

Release Note Release Date : Aug. 2016

Product Ver. : Gen 2017 (v1.1) and Design+ 2017 (v1.1)

Enhancements

(1) Inelastic Hinge Hysteresis Models

(2) RC Wall Checking Detail Report as per ACI 318-11/08

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(1) Isolated Footing as per EN 1992-1-1

(2) Bolt Connection as per EN 1993-1-1

(3) User Defined Max/Min Reinforcement Ratio for column design as per ACI 318-11/08

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1. Inelastic Hinge Hysteresis Model

• Takeda Slip Model

Properties > Inelastic Hinge Properties

• Element Type : Applicable for all element types.

• Material Type : Applicable for all material types.

• Definition : Applicable for all definition types.

• Interaction Type : Applicable for None and P-M type.

• Component : Applicable for all components.

Takeda Slip Model


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1. Inelastic Hinge Hysteresis Model

• Takeda Slip Model

Force-deformation relation of a beam with slab shows obvious pinching characteristics in negative moment region. This pinching behavior is not associated with that often observed in a member failing in shear, but rather associated with a wide crack opening at the bottom of the beam during positive-moment loading; (i.e. after a load reversal from positive-moment loading, the stiffness does not recover until the crack closed at the beam bottom.)

*. S. Otanl, T. KabeyaSawa, H. Shiohara, and H. Aoyama(1983). “Analysis of the Full-scale Seven-story Reinforced Concrete Test Structure” The Faculty of Engineering, University of Tokyo, Vol. XXXVII, No. 2, 1983, pp. 431 - 478.

Takeda-slip Hysteresis Rule

(c) Typical Hysteresis and Reloading

Stiffness K


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1. Inelastic Hinge Hysteresis Model (continued)

• Axial Stiffness Model

Properties > Inelastic Hinge Properties

• Element Type : Applicable for all element types.

• Material Type : Applicable for only RC/SRC(encased).


• Interaction Type : Applicable for only None.

• Component

Beam-Column, Truss or Wall : Applicable for only Fx component.

GL-LINK : Applicable for only Fx, Fy, Fz components.

Axial Stiffness Model

Axial Stiffness Hysteresis Model

after tensile yielding

This axial-stiffness hysteresis model is used for the axial deformation of an independent column as well as a boundary column of a wall. This rule is introduced only to reduce an unbalanced force by a sudden stiffness change at compressive characteristic point Y’.

*. S. Otanl, T. KabeyaSawa, H. Shiohara, and H. Aoyama(1983). “Analysis of the Full-scale Seven-story Reinforced Concrete Test Structure” The Faculty of Engineering, University of Tokyo, Vol. XXXVII, No. 2, 1983, pp. 431 - 478.


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1. Inelastic Hinge Hysteresis Model (continued)

• Steel Buckling Model

Properties > Inelastic Hinge Properties Steel Buckling Model

Buckling Strength (Constant) Buckling Strength (Deterioration)

This hysteresis model can be used to analyze the inelastic buckling of braced frame structure. Under cyclic load reversals, the load-bearing capacity of the beam member decreases as the number of load cycles increases. Steel member is initially compressed until the member buckles and is tensioned until it yields.

*. Black, G. R., Wenger, B. A., and Popov, E. P. (1980). “Inelastic Buckling of Steel Struts Under Cyclic Load Reversals.” UCB/EERC-80/40, Earthquake Engineering Research Center, Berkeley, CA.

• Element Type : Applicable for Beam-Column, Truss and GL-Link.

• Material Type : Applicable for only Steel/SRC(filled).


• Interaction Type : Applicable for only None.

• Component

Beam-Column, Truss or Wall : Applicable for only Fx component.

GL-LINK : Applicable for only Fx, Fy, Fz components.


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2. RC Wall Checking Detail Report as per ACI 318-11/08

• For the strength checking of shear reinforcement, shear strength is calculated and outputted in detail report.

• Previously, shear strength checking was performed based on shear reinforcement ratio but now it is based on shear strength.

Normal RC Wall (ACI 318-11/08)

Detail Result (2016 v2.1) Detail Result (2017 v1.1)


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2. RC Wall Checking Detail Report as per ACI 318-11/08 (continued)

• Shear strength for special structural wall is considered in strength check as per ACI 318-11/08, 21.9.4.1.

Special Structural Wall (ACI 318-11/08)

Detail Result (2016 v2.1) Detail Result (2017 v1.1)

Results of limiting value of shear strength (as per ACI 318-

11/08, 21.9.4.1) were outputted as a reference.

Final shear strength of RC wall is taken as the minimum value between the

shear strength of special structural wall and shear strength of normal wall.

Design+ 2017 (v1.1) Release Note

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midas Design+

Tools > Design+ > RC > Footing

1. Isolated Footing as per EN 1992-1-1 • The report shows the results of column punching at Face / D / 2D and pile punching at Face / 2D, which only showed the critical part previously.

• There are minor corrections on Column β value, visual expression of column, values of k for rectangular loaded areas and unit of stress in Detail report.

4. Minor correction in outputting unit of stress in Detail report

5. For column punching check where the loading

is eccentric to both axes, there has been

correction of ‘b’ values for calculation of β.

Before After

6. Column will not be drawn outside of foundation (for negative eccentricity) Column punching results at Face/D/2D can be shown.

Pile punching results at Face/2D can be shown.

Punching check summary at Face / D / 2D

Minor corrections

1. Moment value used for calculation of β (EN 1992-1-1:2004, Eq 6.39)

2. Interpolated values of k for rectangular loaded areas (EN 1992-1-1:2004, Table 6.1)


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Tools > Design+ > RC > Footing

1. Isolated Footing as per EN 1992-1-1 (continued)

• User can now define the position of column: Internal / Edge / Corner.

• Eccentricity in y-direction of circular column is now available.

Edge

Corner

Internal

Column positions can be defined.

Ey is now activated for Circular column.


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Basic Control Perimeter, U1

1. Isolated Footing as per EN 1992-1-1 (continued)

• Basic Control Perimeter, U1 and Reduced Basic Control Perimeter, U1* for Edge and Corner columns can be calculated as follows.

If U1 is located outside of foundation (Edx ≤ offset or Edy ≤ offset)

Reduced Basic Control Perimeter, U1*

Edge Condition Corner Condition

General Description


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Tools > Design+ > Steel > Bolt Connection

2. Bolt Connection as per EN 1993-1-1

• Bolt connection for ‘Fin Plate: I (Beam) - RHS/CHS (Column)’ has been added.

Addition of bolt connection between RHS/CHS (Supporting) and I-Section (Supported) for ‘Fin Plate – Beam to Colum’ as per Eurocode.

RHS

CHS

Connection examples

Previously it was only possible if both members; supporting and supported were assigned as I-section.

Now it is possible to have bolt connection between I section and hollow section.

e.g. Fin Plate: I (Beam) - RHS/CHS (Column)


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Tools > Design+ > RC > Column

3. User Defined Max/Min Reinforcement Ratio for column design as per ACI 318-11/08

When the reinforcement ratio does not satisfy the Max/Min reinforcement ratio range, the reinforcement ratio will be outputted in RED.

However if it falls within the range that user defined, reinforcement ratio will be outputted in BLUE.

User can define Max/Min Reinforcement ratio.

This can be checked in Summary / Detail / Excel

report.

Output format

• This option is activated when designing column as per ACI standard.

• Applicable when designing pedestal.


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Documents

Release Date : Aug. 2016 Product Ver. : Gen 2017 (v1.1