Secondary Beam Design Results

The secondary beam design results and the failure conditions of the steel beams are displayed in the Secondary Beams dialog. The secondary beams dialog displays PMM ratios, combinations and deflection results. In the “ Details ” tab, material and section properties, internal force values, axial compressive strength, bending moment strength in strong and weak axis, design variables and lateral stiffness coefficients (K coefficient, L factor etc.) and PMM ratio are displayed.

If composite slab is defined for secondary beams, secondary beams become composite beams and are evaluated according to composite beam design criteria.

Location of Secondary Beams Dialog

After the analysis is done, you can access it by clicking the Secondary Beam command under the Steel Design heading in the ribbon menu Analysis and Design tab .

Secondary Beams

Specifications

ID

It is the name of the secondary steel beam in the plan.

Section

It is the section used in the secondary steel beam.

Material

It is the material used in steel beam.

PMM ratio

It is the ratio of requirement to section capacity (PMM Ratio = Need/Capacity).

Combo

It is the load combination that produces the most unfavorable PMM ratio.

Maj-Shr-Ratio

It is the ratio of the shear force in the major direction of the section to the capacity in the major direction.

Combo

It is the load combination that produces the most unfavorable stress ratio in the major direction.

Min-Shr-Ratio

It is the ratio of the shear force in the minor direction of the section to the capacity in the minor direction.

Combo

It is the load combination that produces the most negative stress ratio in the minor direction.

Strength check

It is an information box whose sign changes according to the presence or absence of negativity in the cross section.

Deflection

It is the deflection value made by the secondary steel beam.

Limit value

It is the value of the maximum allowable deflection in the secondary steel beam.

Deflection check

It is an information box whose sign changes depending on whether the deflection limit is exceeded or not.

Details

Design details are shown in detail.

Previous

The cursor moves to the previous line.

Next

The cursor goes to the next line.

OK

It saves the changes made and closes the dialog.

Cancel

Closes the dialog without saving the changes made.

Summary information

The summary information about the line where the cursor is located is given in the name of the dialog in story, pose format.

For example, BASE STORY, SB008

Using the Shift key

In this tab, you can select more than one row with the Shift key, enter a value by double-clicking any cell whose value is open to change, and make that value apply to all selected rows.

Using the Ctrl key

Ctrl key selects the lines in between one by one.

Design Details

Specifications

Schematic drawing

Section properties

It is the part where the name and geometric properties of the section take place.
A: Cross section area.
J: Torsion is the moment of inertia.
I_y: It is the section moment of inertia on the 2 axis.
I_x: The section moment of inertia on the 3 axis.
i_y: It is the radius of inertia on the 2 axis.
i_x: It is the radius of inertia on the 3 axis.
W_ey: Section on the 2 axis is the moment of elastic strength.
W_ex: Section on the 3 axis is the moment of elastic strength.
W_py: Section in 2 axis is the plastic strength moment.
W_px: Section in 3 axis is the plastic strength moment.

Material properties

The properties of the steel material used in the section are listed.
F_y: It is the yield strength.
E: It is the modulus of elasticity.
G: It is the shear modulus.
F_u: It is the tensile strength.

Forces and moments

Internal forces occurring in the element, belonging to the selected load combination, are shown in this section.
P_r: The axial load value.
M_rx: The bending moment of the element in 2 directions.
M_ry: The bending moment of the element in 3 directions.
V_ry: It is the cutting forces of the element in 2 directions.
V_rx: The shear forces of the element in 3 directions.
T_r: The torque of the element.

Combo

The load combination is selected.

Demand/capacity ratio

The requirement / capacity ratio in the cross section of the selected load combination is displayed.
Ratio: It is the ratio value in percentage.
Interaction equation: It is the interaction equation used in ratio calculation.

Shear check

The shear capacity ratio of the steel secondary beam is shown.
V_r: It is the major and minor beam shear force calculated according to the selected load combination.
V_r/Omega*V_c: The shear capacity of the steel beam in major and minor directions.
Ratio: It is the ratio value calculated based on the effect and capacity.

Axial force and biaxial bending check

The axial capacity and moment capacity ratios of the steel secondary beam are shown.
P_r: The secondary beam axial load calculated according to the selected load combination.
P_c/Omega capacity: It is the axial pressure load capacity of the steel secondary beam.
P_t/Omega capacity: It is the axial tensile load capacity of the steel secondary beam.
M_r: It is the moment value in major and minor direction calculated according to the selected load combination.
M_c/Omega capacity: It is the moment carrying capacity of the steel secondary beam.
T_r: The secondary beam torque value calculated according to the selected load combination.
T_c: It is the torsional moment carrying capacity of the steel secondary beam.

Design factors

K factor: It is the effective length coefficient used in calculations.
L factor: It is the supported length ratio used in the calculations.
LTB - L factor: It is the value used for lateral torsion buckling in the calculations.
C_b factor: It is the flexural coefficient used in the calculations.

Next Topic

Composite Castellated Beam Results

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