Chinese Steel Design Parameters dialog

Opens when the Add or Edit button is clicked on the Chinese Steel Design Parameters - Whole Structure dialog.

General Parameters tab

Setting

Description

Parameter Name

Type a unique label used to identify the parameter set.

Steel No

Select the steel grade used (independent of any steel grade assigned as part of a material definition):

Q235 (default)
Q345
Q355
Q390
Q420
Q460

Refer to Steel Grade for additional details.

Member Type

Select the member type for design:

Automatic (default) - the actual type of the member is determined by the program based on the Principle selection.
Bending - a beam for which bending (MZ, MY) are considered but axial force (FX) is ignored for design.
Truss - only axial force (FY) is considered for design.
Column - both moment and axial force are considered for design.
Defined - for this type of member, the provisions for code checks are all user-defined.

Refer to Member Type for additional details.

Principle

Select the option which the program should use to determine the member type for Automatic:

Geometry - uses the geometric conditions of the member for selection as follows:

geometric condition	member type
member in a horizontal plane	bending
member with a truss specification	truss
any other condition	column

Stress Feature - uses the stress conditions of the member for selection as follows:

stress condition	member type
no axial force	bending
no bending moment	truss
any other condition	column

Refer to Member Type for additional details.

Check as Cantilever Member

Specify any cantilever member checks:

None (default)
Both - both major and minor axes
Major Axis
Minor Axis

Truss Secondary Moment

When this option is checked, the stability of axial members is per Cl. 8.5.2 and axial members are designed for strength per Cl. 8.5.2.

Section Slenderness Grade

Select the slenderness grade to check the width-to-thickness ratio of beam and column members per Table 3.5.1:

S1
S2
S3 (default
S4
S5

Use Axis forced member Post-Buckling

When this option is checked, the post-buckling strength is checked per Cl. 7.3.3 for members whose width to thickness ratio exceeds the limits in Cl. 7.3.4.

Displacements Load List

Click […] to open the Select Load Case for Displacements dialog, which is used to select the load cases and combinations which the program should use for displacement checks.

Fatigue Check Request

Force Loads List

Click […] to open the Select Load Case for Design dialog, which is used to select the load cases and combinations which the program should use for design checks.

Optimize Design

When this option is checked, members using this design parameter set participate in the design optimization (used with the optimization option).

Failure Ratio Above

Members whose design ratio (calculated / allowable stress) exceeds this value will be shown as Failed.

Safety Ratio Below

Members whose design ratio (calculated / allowable stress) falls below this value will be shown as Minimal (i.e., overly conservative).

Seismic Design tab

Setting	Description
Seismic Adjusting Factor	Check this option to specify the seismic adjusting factor values for Stability and Strength checks from the following: Auto (default) 0.75 0.8 1.0
Seismic Measure Grade	Select the levels as per Clauses 8.3.1, 8.3.2, and 8.4.1 and from Table 8.3.2. Select from the following: None (default) Level 1 Level 2 Level 3 Level 4
Reduction Factor of Bearing Capacity	Specify an optional value (less than 1.0) used for checking requirements of full plastic bearing capacity of left and right beam ends and upper and lower column ends of beam column joints per the exceptions in Cl. 8.2.5.

Allowable Slenderness tab

Setting	Description
Allowable Compression Slenderness	Select the allowable value of slenderness ratio for members in compression: Auto (default) - the value is determined as per Table 7.4.6 150 200
Allowable Tension Slenderness	Select the allowable value of slenderness ratio for members in tension: Auto (default) - the value is determined as per Table 7.4.7 200 250 300 350 400
Seismic Brace, GB50011-2010 8.4.1	Check this option to include checking slenderness of brace members per Cl. 8.4.1.
Seismic Multi-storey Plant, GB50011-2010 H.2.8	Check this option to include checking slenderness of multi-story industrial structures per Cl. H.2.8.
Seismic Column, GB50011-2010 8.3.1	Check this option to include checking slenderness of frame columns per Cl. 8.3.1.
Seismic Single-storey Plant, GB50011-2010 9.2.13	Check this option to include checking slenderness of single-story industrial structures per Cl. 9.2.13.

Plastic Development Factor tab

The plastic development coefficient is a coefficient related to the shape of the section. The coefficient can be according to article 6.1.2 8.1.1 of the specification. If you enter the design parameters γ_z, γ_y, γ_sharp, the program will use those values. If you select to use automatic calculation, the program will use values for γ_z, γ_y, γ_sharp as specified in Plastic Development Coefficients γx, γy, γsharp.

Setting	Description
Major Axis (Z Axis)	The γ_z value. Auto (default) 1.05 1.20
Minor Axis (Y Axis)	The γ_y value. Auto (default) 1.05 1.20
Sharp (Tee/Double Angle/Channel)	The γ_sharp value. Auto (default) 1.05 1.20

Equivalent Moment Factor tab

The equivalent moment coefficient is used to "correct" the bending moment when checking the stability of the solid web bending member with bending moment acting on the symmetry axis plane, so it is divided into in-plane equivalent moment coefficient and out of plane equivalent moment coefficient. These coefficients can be calculated automatically by program or manually input.

Setting	Description
Equivalent Moment Factor in-Plane	Auto (default) 1.00 0.85 0.65
Equivalent Moment Factor out-Plane	Auto (default) 1.00 0.85 0.65
Lateral Load Along Local y	Auto (default) 1.00 0.85 0.65
Lateral Load Along Local z	Auto (default) 1.00 0.85 0.65

Deflection Parameters tab

Refer to Deformation Parameters for additional details.

Setting	Description
Span/Deflection (DFF)	Select the span-to-deflection ratio limit: 150 200 250 300 350 400 (default) 500 600 750 1,000
Start Joint (DJ1)	Select the starting joint used to define the member for deflection checking: Auto - forms a continuous beam Member start joint - selects the current member start joint
End Joint (DJ2)	Select the ending joint used to define the member for deflection checking: Auto - forms a continuous beam Member end joint - selects the current member end joint
Check Horizontal Section Displacement	Check this option to check horizontal displacement in addition to the vertical displacement in calculation of deflections against limits.

Stability Factors tab

The stability coefficient is divided into overall stability coefficient of flexural member (beam) and stability coefficient of axial compression member (truss). The program can automatically calculate the coefficients according to the section type and force characteristics of the designed member as described in Stability Coefficient.

Setting

Description

Overall Stability Factor of Beam

Setting	Description
Major Axis (Z Axis)	Auto
Minor Axis (Y Axis)	Auto
Stress Feature (GB50017-2017 Appendix Table C.1)	Type1 Type2 Type3 Type4 Type5 Type6 Type7 Type8 Type9 Type10

Stability Factor of Axial Compression

Setting	Description
Major Axis (Z Axis)	Auto
Minor Axis (Y Axis)	Auto

Axial Compression Section Type

Setting	Description
Major Axis (Z Axis)	Auto Class a Class b Class c Class d
Minor Axis (Y Axis)	Auto Class a Class b Class c Class d

Effective Length tab

The unsupported effective length and effective length coefficient are the calculation parameters needed to check the stability of members. The direction of the strong axis and the weak axis of the principal inertial axis should be considered respectively. For complex structures, it can difficult to select the effective length and effective length coefficient of members. Therefore, the program can automatically compute these values. When these coefficients are automatically calculated by the program, they are calculated as described in Unsupported Effective Length and Effective Length Coefficient. The values may also be user-specified.

Setting	Description
Unbraced Length	The unbraced length (in meters) of the members, in both the Major Axis (Z Axis) and Minor Axis (Y Axis).
Effective Length	Select the member bracing condition in the Brace Type drop-down. Then, specify the effective length coefficients, $μ_{z}$ (Major Axis (Z Axis)) and $μ_{y}$ (Minor Axis (Y Axis)). Note: If the current solution set is set to use a P-Delta analysis type, then the effective length options are disabled. An effective length of 1.0 is used for all design parameter sets for this solution set type.
Gyration Radius Calculation of Single Angle	Select the option to use for the radius of gyration for single angles: Parallel Leg Calculation (Y-Z Axis) - the geometric axes Strong Weak Axis Calculation (U-V Axis) - the primary axes Refer to Rigid Fixed Stepped Column at the Lower End of Frame of Single Story Workshop for details.

Detailing Checks tab

The structural requirement parameters specified here refer to the limits of flange width thickness ratio and web height thickness ratio, as well as the section type of axial compression members. Generally, this parameter is automatically calculated by the program. However, in order to make it easier for users to design the program more flexibly, you can also set the parameters required here. Refer to Construction Requirements for details.

Setting	Description
Flange Slenderness Limit (b/t)	Auto
Web Slenderness Limit (h0/tw)	Auto
Include check for web of H profiles in a Truss as per GB50017-2017, Table 8.5.2	Check this option to use the values for Table 8.5.2 instead.

Section Factor tab

The net section coefficient refers to the ratio of net section to gross section area and section modulus (temporarily replaced by net section modulus coefficients An, Wnz, and Wny). The default value is 1.0. Refer to Section Coefficient for details.

Setting

Description

Net Section Factor

Setting	Description
Net Area Factor (An/A)	Type a value to use for the net section area to gross area ratio.
Net Resistance Moment Factor (Wny/Wy)	Type a value to use for the net moment resistance to gross section moment resistance ratio about the y direction.
Net Resistance Moment Factor (Wnz/Wz)	Type a value to use for the net moment resistance to gross section moment resistance ratio about the z direction.

Effective Section Factor of Axis Force (nA)

Type a value to use for the net section area to gross area ratio.

Reduce Factor

Setting	Description
Reduce Strength of Angle Section (Ref. 7.6.1)	Check this option to use a re
Strength Reduction	Auto 0.70 0.85 0.90
Stability Reduction	Auto 0.70 0.85 0.90
Unequal Angle Connection	Short leg Long leg (default)

Optional Checks tab

Optional checks based on the selected member type. Any of the checks can be un-selected to prevent that check from being performed.

For bending members:

Beam Bending Strength
Beam Deflection
Flange Slenderness
Overall Stability
Equivalent Stress
Web Slenderness
Shear Strength

For truss members:

Compression Flange
Compression Shear
Compression Stability
Compression Web Slenderness
Compression Slenderness
Truss Strength
Tension Slenderness

For column members:

Column Strength
Compression Flange Slenderness
Compression Slenderness
Compression Web Slenderness
Shear Strength
Stability in-plane
Stability out-plane
Tension Slenderness

For defined members:

Setting	Description
Strength	Select the strength check: Beam Bending Strength Truss Strength Column Strength
Stability	Overall Stability Compression Stability Stability in-plane
Flange Slenderness	Flange Slenderness Compression Flange Slenderness
Web Slenderness	Web Slenderness Compression Web Slenderness
Other	Shear Strength Compression Shear Equivalent Stress Stability out-plane Beam Deflection Compression Slenderness Tension Slenderness