CPR MDT JET HITS BARRIER ON CLOSED PORTION OF RWY CAUSING DAMAGE TO THE MAIN LNDG GEAR.

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AS WE ARRIVED INTO THE CLEVELAND AREA; I WAS FLYING IN THE L SEAT AND THE PIC WAS IN THE R SEAT. WE HEARD ATIS SAY THEY WERE USING RWY 23L. WIND WAS 210 DEGS AT 7 KTS VISIBILITY 6 MI. THEY SAID THERE WERE A LOT OF TXWYS CLOSED AND THE FIRST 2000 FT OF RWY 23L WAS CLOSED. WE WERE RADAR VECTORED AROUND THE ARPT FOR A LOC DME APCH TO RWY 23L. THE GS WAS OUT OF SVC. WE WERE TURNED ONTO THE LOC AND THE SUN WAS VERY BRIGHT. THE OTHER PLT AND I BOTH COMMENTED ON THE BRIGHTNESS OF THE SUN. AS WE APCHED THE RWY WITH OUR HANDS AT TIMES COVERING OUR EYES; I NEVER SAW ANY CONSTRUCTION SIGNS NOR DID THE OTHER PLT EVER POINT ANY OUT. AS THE AIRPLANE WAS SETTLING INTO THE RWY; I WAS SEARCHING FOR THE BARRIERS. THE SUN BEING SO BRIGHT MADE IT IMPOSSIBLE TO SEE ANYTHING. I THOUGHT PERHAPS THE OBSTRUCTION COULD HAVE BEEN ON THE OTHER END OF THE RWY. AT THAT SECOND THERE IT WAS; A SMALL RED AND WHITE BARRIER (LATER IDENTED AS A 1 FT BY 1 FT BY 10 FT LONG LOG). I THEN PULLED THE ACFT UP; AS I DID THE L REAR MAIN WHEEL HIT THE BARRIER. I KEPT THE ACFT ON THE RWY AS LONG AS POSSIBLE BEFORE WE WENT INTO THE ROUGH. WE CALLED FOR THE CRASH EQUIP. THE ACFT WAS EVACED; THERE WAS NO FIRE. THE 3 CREW MEMBERS AND 5 PAX WERE SAFE. PREVENTIVE MEASURES SHOULD BE TAKEN AS FOLLOWS: THE CTL TWR SHOULD REPEAT OBSTRUCTIONS ON RWY WHEN CLRED TO LAND; ESPECIALLY WHEN THE OBSTRUCTION IS SO SMALL. ANY OBSTRUCTIONS ON RWY SHOULD HAVE YELLOW BLINKING LIGHTS; RED CONES AND MADE OF A FLEXIBLE MATERIAL. THIS PRACTICE SHOULD BE ENFORCED DURING ALL ARPT OPS.