RPTR LANDS ON DEFICIENTLY MARKED CONSTRUCTION AREA ON RWY AND DAMAGES AIRPLANE.

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ON SUNDAY MORNING AT XA50 AM; I FLEW A PIPER ARCHER FROM CENTENNIAL ARPT TO THE FORT COLLINS ARPT. I WAS GOING TO DO A TOUCH AND GO AT THE FORT COLLINS ARPT. PRIOR TO MY FLT I RECEIVED A WX BRIEFING FROM THE DENVER FLT SVC STATION AND WAS INFORMED THAT THE APCH END OF THE RWY WAS CLOSED. WHEN I WAS ON FINAL I THOUGHT I HAD SUFFICIENT ALT AND AIRSPD TO MAKE IT TO THE PART OF THE RWY THAT WAS OPEN AND LIT. AS I CAME IN FOR THE APCH I NOTICED NOTHING WRONG WITH THE RWY AND MADE A LOW APCH. WHEN I TOUCHED DOWN I HIT A 2 FT PEG IN THE RWY AND NOTICED MANY ILLUMINATED BARRICADES IN FRONT OF ME. I APPLIED FULL PWR AND WAS ABLE TO CLR THE OBSTACLES IN FRONT OF ME. I THEN EXITED THE RWY AND I NOTICED A SMALL TEAR ON THE BACK SIDE OF THE R FLAP. I DIDN'T BELIEVE THE DAMAGE WAS SUBSTANTIAL SO I FLEW THE PLANE BACK TO CENTENNIAL ARPT. I CALLED THE NTSB AND FAA CALLED ME TO FIND OUT WHAT TOOK PLACE SUNDAY MORNING. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THAT WHEN HE TALKED WITH DEN FLT SVC PRIOR TO THE FLT; HE WAS TOLD THE FIRST 400 FT OF RWY 33 WAS CLOSED. FLT SVC DID NOT INDICATE CONSTRUCTION WAS IN PROGRESS. ACTUALLY; 4000 FT WERE CLOSED AND UNDER REPAIR. IF HE HAD KNOWN THIS HE WOULD NOT HAVE LANDED AT THE ARPT FOR THE TOUCH AND GO. HE WAS DOING THE FLT TO COMPLETE HIS 50 HR XCOUNTRY REQUIREMENT. HE SAID HE NEVER DID SEE THE LIGHT ON THE BARRICADE. ALTHOUGH; THERE WAS A FLASHING YELLOW BATTERY POWERED LIGHT COMMON TO THOSE NORMALLY SEEN ON 'A' FRAME BARRIER SIGNS; IT WAS HIS LNDG LIGHT THAT ILLUMINATED THE BARRICADE AND EQUIP WHICH PROMPTED HIS SUCCESSFULLY JUMPING OVER AFTER LNDG. ANOTHER AIRPLANE LATER THAT EVENING WAS LESS LUCKY IN THAT HE CRASHED INTO THE CONSTRUCTION AND REPAIR EQUIP. AS IT WAS; THE RPTR'S AIRPLANE WAS DAMAGED IN THE FLAP AND FUEL TANK. THE RPTR STATED A LOW PASS WOULD HAVE REVEALED THE PROB AND HE WOULD NOT HAVE LANDED. THE NOTAM WAS CHANGED THE NEXT MORNING TO CLARIFY THE EXTENT OF THE CONSTRUCTION ACTIVITY.