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| Universal mechanical testing device |
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| Diaphragm with perimeter edging on structural panels |
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| Record receptacle for a burial vault |
| FIG. 1 illustrates a perspective view of a burial vault 100 for use with an embedded and sealed ... |
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| Method and apparatus for real-time structure parameter modification |
| First, with reference to FIG. 1, a building structure is indicated generally at 10. The structure ... |
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| Burial crypt |
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TMD-damped stay cable and method and TMD
| Details |
Inventors: Tabatabai, Habib; Mehrabi, Armin B.;
Assignee: Construction Technology Laboratories, Inc. (Skokie, IL)
Primary Examiner: Neuder; William
Assistant Examiner:
Attorney, Agent or Firm: Norek; Joan I. The Law Office of Joan I. Norek
Wind-rain induced vibrations of a cable-stayed bridge are damped using tuned mass damper(s) ("TMD"). A TMD-damped cable-stayed bridge is comprised of (a) a bridge having at least one span, at least one pylon, and at least one stay cable extending from a point on the pylon to a point on the span and (b) at least one tuned mass damper in damping communication with the stay cable. A TMD-damped stay cable is comprised of (a) a stay cable comprised of a core of at least one longitudinal element or strand within a tube and (b) a tuned mass damper in damping communication with the stay cable. The TMD can be mounted on the stay cable in a low-profile position relative the stay cable and/or at any desired position along the length of the cable. The TMD can be of annular configuration and comprised of a viscoelastic spring system and an outer mass. The outer mass can be formed of two mating sections. |
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DETAILED DESCRIPTION OF THE INVENTION Referring to FIG.
1 through FIG.
6, there is shown a typical span of a twin-pylon, cable stayed bridge, designated by the reference number 10.
The bridge 10 as depicted is of the type that might have a main span of up to about 800 or 900 meters.
As shown, the bridge 10 has a plurality of two-legged pylons, namely a first two-legged pylon 11 and a second two-legged pylon 13.
The first two-legged pylon 11 is comprised of first and second pylon legs 12, 14 bridged by a tie 20.
The second two-legged pylon 13 is comprised of third and fourth pylon legs 16, 18 bridged by a tie 22.
(Since each leg of the two-legged pylons 11, 13 is itself a column, each two-legged pylon could be described as a pair of pylons bridged by a tie.
Single-legged pylons are used at times and of course are not excluded from the present invention.
) There are two planes of stay cables 22 at each two-legged pylon.
Each plane of cables is comprised of twenty-four stay cables 22, twelve of which are positioned on each side of the respective pylon leg, forming in combination a semi-harp arrangement of cables.
Thus there are a total of ninety-six stay cables 22 on the bridge 10 depicted.
Stay cables generally (except single-strand stay cables) and as depicted are comprised of a bundle of steel strands 26 (also referred to as wires), which forms the core 48, encased or sheathed within a chemical-resistant and moisture resistant outer cover, such as a polyethylene (sometimes steel) pipe or tube 28.
A typical strand is a 15.
2-mm-diameter, seven-wire strand with a nominal strength of about 1860 MPa.
The strands of the stay cables generally can be uncoated, epoxy-coated, or individually greased and coated with polyethylene sheathing.
As shown, the strands 26 of the stay cables 22 are uncoated.
The outer pipe 28 both bundles the strands 26, holding them together, and protects them from adverse environmental conditions.
In U.
S.
practice, cement group 52 (as shown) is commonly injected into the pipe 28 to provide additional protection for the strands 26
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