HIGH SPEED IMPACT
CURRENTLY UNDER STUDY AT THE RESEARCH CENTER IS A PROJECT TO DETERMINE THE EFFECT OF HIGH SPEED IMPACT STRESSES ON CONCRETE. IT HAS LONG BEEN THOUGHT THAT CONCRETE WAS ABLE TO WITHSTAND HIGHER STRESSES WHEN RAPIDLY APPLIED AND THIS IS BEING DEMONSTRATED AT THE RESEARCH CENTER. BATTERED RAIL JOINTS ON BRIDGES RESULT IN SUCH HIGH SPEED IMPACTS AND THIS TYPE OF CONDITION IS BEING DUPLICATED IN THE LABORATORY. TRUE IMPACTS PRODUCE STRESS INCREASES IN 0.005 SEC WHEREAS ORDINARY DYNAMIC STRESS INCREASES MAY OCCUR IN ONLY 0.5 SEC. A SHORT PRESTRESSED CONCRETE BEAM HAS BEEN INSTALLED IN A ROLLING LOAD MACHINE AND PERMITS REPEATED APPLICATIONS OF HIGH SPEED IMPACTS OF VARIOUS AMPLITUDES. IT HAS BEEN INTERESTING TO NOTE THAT IDENTICAL CONCRETE BEAMS STRESSED TO THE SAME LEVEL WILL CARRY MORE CYCLES OF LOAD UNDER HIGH SPEED IMPACT THAN UNDER NORMAL SPEED STRESS APPLICATIONS. /ARTICLE/
- Publication Date: 1967
Media Info
- Pagination: 18 p.
- Serial:
Subject/Index Terms
- TRT Terms: Accelerated tests; Beams; Bridge railings; Concrete; High speed ground transportation; High speed vehicles; Impacts; Prestressed concrete; Prestressing; Repeated loads; Speed; Stresses
- Subject Areas: Bridges and other structures; Highways; Railroads;
Filing Info
- Accession Number: 00208951
- Record Type: Publication
- Files: TRIS
- Created Date: Apr 21 1994 12:00AM