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A support structure for a burner tube in a combustor cap assembly for a gas turbine combustor includes an outer annular ring; an inner annular hub; and a plurality of struts extending radially between said outer annular ring and the inner hub. The inner hub is provided with a piston ring groove and

A support structure for a burner tube in a combustor cap assembly for a gas turbine combustor includes an outer annular ring; an inner annular hub; and a plurality of struts extending radially between said outer annular ring and the inner hub. The inner hub is provided with a piston ring groove and a piston ring adapted to receive and seal an inner end of the burner tube.

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1. A support structure for a burner tube in a combustor cap assembly for a gas turbine combustor comprising: an outer annular ring;an inner annular hub; anda plurality of struts extending radially between said outer annular ring and said inner annular hub, wherein an end of each strut is directly at

1. A support structure for a burner tube in a combustor cap assembly for a gas turbine combustor comprising: an outer annular ring;an inner annular hub; anda plurality of struts extending radially between said outer annular ring and said inner annular hub, wherein an end of each strut is directly attached to an outer surface of the inner annular hub and an inner surface of the inner annular hub is configured to receive said burner tube;an annular piston ring groove formed in the inner surface of the inner annular hub, anda piston ring seated in the piston ring groove and adapted to receive and seal an inner end of the burner tube, the piston ring located radially between the inner annular hub and the burner tube;wherein said burner tube is radially outer to, and encircles, a fuel nozzle. 2. The support structure of claim 1 wherein said inner annular hub is formed with tapered portions on forward and aft ends thereof, the tapered portions being tapered towards a center of the inner annular hub. 3. The support structure of claim 2 wherein said piston ring groove is formed axially between said opposite forward and aft ends. 4. The support structure of claim 2 in combination with an effusion plate, said effusion plate having a circular opening defined by a forward-facing tapered edge, and wherein said aft end of said inner annular hub is welded to said forward-facing tapered edge on said effusion plate. 5. The support structure of claim 1 wherein said plurality of struts comprises five struts and wherein said burner tube comprises a center nozzle burner tube. 6. The support structure of claim 4 wherein said circular opening in said effusion plate is formed in a center portion of said effusion plate, with plural openings in the effusion plate surrounding said circular opening. 7. The support structure of claim 6 wherein each of said plural openings has a forward-facing support sleeve adapted to receive a peripheral burner tube, each forward-facing support sleeve having an inner piston ring groove fitted with a piston ring adapted to engage the peripheral burner tube. 8. A combustor cap assembly comprising: a support structure for the combustor cap assembly at forward and aft ends thereof for supporting a plurality of fuel nozzles and surrounding burner tubes, including a center nozzle and a center burner tube;the support structure at said aft end including an effusion plate having a circular opening defined in part by a sleeve facing said forward end and a wagon-wheel structure having an outer annular ring and an inner annular hub; anda plurality of struts extending radially between said outer annular ring and said inner annular hub and the struts being directly attached to the inner annular hub;a piston ring groove in a radially inward surface of said inner annular hub, anda piston ring seated in the piston ring groove of the inner annular hub, the piston ring located radially between the inner annular hub and the burner tube, wherein the piston ring is adapted to receive and seal an inner end of the burner tube. 9. The combustor cap assembly of claim 8 wherein said inner annular hub is formed with tapered edges on opposite forward and aft ends thereof, the tapered portions being tapered towards a center of the inner annular hub. 10. The combustor cap assembly of claim 9 wherein said piston ring groove is formed axially between said opposite forward and aft ends. 11. The combustor cap assembly of claim 8, the circular opening of said effusion plate being defined by a forward-facing tapered edge, and wherein said aft end of said inner annular hub is welded to said forward-facing tapered edge on said effusion plate. 12. The combustor cap assembly of claim 8 wherein said plurality of struts comprises five struts extending radially from a center axis of the inner annular hub and arranged symmetrically about the center axis. 13. The combustor cap assembly of claim 11 wherein said circular opening in said effusion plate is formed in a center portion of said effusion plate, with plural openings surrounding said circular opening. 14. The combustor cap assembly of claim 8 wherein inner ends of said burner tubes are unconstrained to thereby permit thermal growth in an axial direction. 15. A combustor cap assembly comprising: a support structure for the combustor cap assembly at forward and aft ends thereof for supporting a plurality of fuel nozzles and surrounding burner tubes, including a center nozzle and a center burner tube;the support structure at said aft end including:an effusion plate having at least one circular opening defined in part by a sleeve facing said forward end; anda wagon-wheel structure having an outer annular ring and an inner annular hub; anda plurality of struts extending radially between said outer annular ring and said inner annular hub;a piston ring groove in a radially inward surface of said inner annular hub;a piston ring seated in the piston ring groove and adapted to receive and seal an inner end of said center burner tube, the piston ring located radially between the inner annular hub and the burner tube; andthe at least one circular opening includes a central circular opening defined by a forward-facing tapered edge of said sleeve, and wherein said aft end of said inner annular hub is attached to said forward-facing tapered edge. 16. The combustor cap assembly of claim 15 wherein said central circular opening is surrounded by plural openings adapted to receive peripheral burner tubes associated with peripheral fuel nozzles. 17. The combustor cap of assembly of claim 16 wherein each of said plural openings is formed with a forward-facing support sleeve adapted to receive a respective one of said peripheral burner tubes, each forward-facing support sleeve having an inner piston ring groove fitted with a piston ring adapted to engage said respective one of said perpheral burner tubes. 18. The combustor cap of assembly of claim 15 wherein said aft end of said inner annular hub is welded to said forward-facing tapered edge. 19. The combustor cap assembly of claim 15 wherein an aft end of said center burner tube is free to thermally grow relative to said inner annular hub and said sleeve. 20. The combustor cap assembly of claim 15 wherein aft ends of each of said burner tubes are free to thermally grow relative to said sleeve.