Effective Width

Automatically calculates effective width of PSC Box section (1Cell, 2Cell, nCell, nCell2) and PSC-Tee type section.

From the section of the girder defined in Span Information, Effective Width automatically calculates the moment of inertia (Iyy) about the y-axis and checks the sectional stresses reflecting the effective width. A scale factor of the new moment of inertia and neutral axis to the original moment of inertia and neutral axis is created. This generates the data for Boundary>Effective Width Scale Factor.  

From the Main Menu select Structure > Wizard > PSC Bridge > Effective Width..

Design Code

Following design code can be used:

EN 1992-2:2005

AASHTO LRFD Bridge Design Specifications 2012

2005 Korean Standard Specifications for Highway Bridges (KR-KSCE05)

Japanese Standard Specifications for Highway Bridges (JIS-Civil)

Chinese Standard Specifications for Highway Bridges (JTG D62-2004)

Calculation of bs and bf

Exact: Considers the linear deformation of bm/b in "a, c" interval. (Refer to 2005 Road & Bridge Design Standard).

Approximation: Does not consider the linear deformation of bm/b in "a, c" interval. Calculates the effective width only using bs, bf value. (Refer to 2005 Road & Bridge Design Standard).

Scale Factor

Apply the scale factor to the effective width calculated. If the effective width multiplied by the scale factor is larger than the total width, then the total width is used.

Consider the Variation of Centroid

Check on whether to reflect the translation of neutral axis due to considering the effective width. Calculated result is produced as z_top & z_bot Scale Factor in the Effective Width Scale Factor Table.

Save and display the calculation results of the stiffness considering the effective width.

Stiffness ratio and neutral axis considering the effective width

Stiffness ratio considering the effective width