TR.37.7.5.1 User-Defined Hinge Property
Several hinge property may be specified with specific type identifier. User may later refer this type identifier while assigning specific hinge properties to members (See "TR.37.7.9 Validation of Commands other than Input Parameters "). If hinge property is not specified, STAAD assumes the FEMA specified hinge properties.
To specify uncoupled moment hinge property of the member following input is required.
General Format
HINGE PROPERTY MOMENT
TYPE n1
A xa1 ya1 B xb1 yb1 C xc1 yc1 D xd1 yd1 E xe1 ye1 YM f11 YR f21
IO f31 LS f41 CP f51
…
TYPE ni
A xai yai B xbi ybi C xci yci D xdi ydi E xei yei YM f1i YR f2i
IO f3i LS f4i CP f5i
| Parameter | Description |
|---|---|
| n1,…, ni | Type identifier (Hinge property number) |
| A, B, C, D, E | Points on the load deformation curve at points A, B, C, D, and E as specified in FEMA |
| xa1 ya1 … xe1 ye1,…, xai yai … xei yei | Coordinates of A, B, C, D, E respectively |
| xa1, …, xe1, …, xai, …, xei | Deformation Ratio, θ/θy |
| ya1 …, ye1, …, yai, …,yei | Moment Ratio, Q/Qy |
| f11,…,f1i | Yield moment in current force units |
| f21,…,f2i | Yield rotation in radians |
| f31,…,f3i | Immediate occupancy in deformation ratio |
| f41,…,f4i | Life safety in deformation ratio |
| f51,…,f5i | Collapse prevention in deformation ratio |
The coordinates of point A should be always (0, 0) and that of point B is (1.0, 1.0). Both the coordinates of point C must be greater than 1.0. The X coordinate of point D must be same as that of point C and Y coordinate must be less than 1.0. The X coordinate of point E must be greater than that of point D and Y coordinate should be same as that of point D.
See "TR.37.7.5.2 Assignment of Hinge Property to the Members" for example input.