SAP 2000 / ETABS Modeling Total Mass and Weight The mass and weight input are estimated values for the dampers and the steel braces that are used to attach them to the structure. Since these items will add a very small amount of weight to the overall structure, they will have a small impact on the performance of the building. Attached are drawings of typical dampers and a drawing showing how our dampers are installed in diagonal bracing elements. You can select the damper weight from the drawing of the damper size that works for your project. You will also have to calculate the weight of the extender based on the size of tube that you select and the length of the entire damper/brace assembly. Rotational Inertia These are intended to define the elements resistance to flexural and torsional deformations. Since viscous dampers generally only experience axial loading and deformation and are not intended to resist flexure and torsion, the rotational inertias are set to zero. Directional Properties Viscous dampers are axial elements and generally only experience axial loading and deformations. Consequently, the model of viscous dampers only requires property definitions in the U1 direction, where U1 is the local axial direction of an element. Linear Properties Because viscous dampers are velocity dependent and do not resist static loads, the linear properties are set to zero. Nonlinear Properties The stiffness is expressed as K = AE/L for the extender brace/damper. When doing this, it is important to assure a substantial area, "A" of the extender brace to assure that you will fully activate the damper by minimizing elastic deflections of the brace and maximizing deflections inside the damper. At the same time, this should also assure that there is enough moment of inertia "I" and area "A" to have significant resistance against buckling in the compression direction. The following equation illustrates the relationship of the damping coefficient and exponent to the stroking velocity of the damper: F=CV

where C is the damping constant (damping coefficient) and is the velocity exponent. Taylor Devices makes dampers with in the range of 0.3 to 1.0. We can make just about any damping constant that is desired. For your model, you may want to start with damping set at 50 and an exponent of 0.4. You can tweak (modify) these values to improve the performance if analysis time permits.

Craig WintersOval

Craig WintersOval

FULLRADIUS BORE

SPHERICAL BEARING

MID-STROKE LENGTH

CLEVIS DEPTH PLATETHICKNESS

CLEVISWIDTH

CYLINDER DIA.

AND/OR FOR FORCE CAPACITIES FOR STROKELONGER THAN LISTED IN TABLE.

& LOCK-UP DEVICESFLUID VISCOUS DAMPERS

* DENOTES 4-BOLT MOUNTING PATTERN DENOTES CUSTOM PATTERN. CONSULT FACTORY.

NOTE: VARIOUS STROKES ARE AVAILABLE, FROM 50 TO 900mm. FORCE CAPACITY MAY BE REDUCED FORSTROKE LONGER THAN STROKE LISTED IN TABLE. ANYSTROKE CHANGE FROM THE STANDARD STROKEVERSION DEPICTED CHANGES MID-STROKE LENGTHBY FIVE MILLIMETERS PER 1 MILLIMETER OF STROKE.

EXAMPLE: 1000 kN 100 mm STROKE, MID-STROKE LENGTH IS 1048 mm 1000 kN 150 mm STROKE, 150-100 = 50 TIMES FIVE = 250 1048+250 = 1298 mm MID-STROKE LENGTH

BELLOWS MAY BE REPLACED WITH A STEEL SLEEVEAS DESIRED STROKE LENGTHS INCREASE. CONSULTTAYLOR DEVICES FOR STROKE OVER 300 mmTAYLOR DEVICES INC.

90 TAYLOR DRIVEN. TONAWANDA, NEW YORK, 14120 WWW.TAYLORDEVICES.COM, PHONE 716-694-0800 OR FAX 716-695-6015

CLEVIS

"A""B"

"B"

"C"

"C"

"A"

THICKNESS

"D"

FORCE"A"

(mm)"B"

(mm)"C"

(mm)"D"

(mm)

PLATE THICKNESS

(mm)250 kN 1783 127.25 * 20.6.25 38.76500 kN 2823 203.25 * 31.8.25 38.76750 kN 3433 254.25 127.25 28.7.25 61.76

1000 kN 4193 318.25 159.25 31.8.25 761.51500 kN 4323 330.25 165.25 34.9.25 761.52000 kN 4573 343.25 171.5.25 38.1.25 1021.53000 kN 5083 406.25 203.25 41.4.25 1021.54000 kN 6500 kN 8000 kN

FORCESPHERICAL

BEARING BORE DIA. (mm)

MID-STROKE LENGTH (mm)

STROKE (mm)

CLEVIS THICKNESS

(mm)

CLEVIS WIDTH (mm)

CLEVIS DEPTH (mm)

CYLINDER DIA. (mm)

WEIGHT (Kg)

250 kN 38.10 787 75 41 100 MAX. 83 114 MAX. 44500 kN 50.80 997 100 54 127 MAX. 102 150 MAX. 98750 kN 57.15 1016 100 57 155 MAX. 129 184 MAX. 181

1000 kN 69.85 1048 100 70 191 MAX. 150 210 MAX. 2541500 kN 76.20 1105 100 76 205 MAX. 162 241 MAX. 3062000 kN 88.90 1346 125 89 230 MAX. 191 292 MAX. 4503000 kN 101.60 1441 125 114 290 MAX. 203 350 MAX. 8004000 kN 127.00 1626 125 140 325 MAX. 273 425 MAX. 10886500 kN 8000 kN