Adjustable flexure loading apparatus for testing long span beams

An adjustable apparatus for supporting a long span specimen in a flexure test by a load application device, said apparatus comprising:

• an upper structure including an elongated beam, at least one support bracket adjustably mountable along a longitudinal span thereof, and a saddle pivotally mounted in said at least one upper support bracket, said saddle engageable in support of the specimen and said upper structure engageable with the load application device opposite said saddle;
• and
• a lower structure spaced apart from said upper structure, said lower support structure including a support beam, at least one spacing member adjustably mounted along a longitudinal span thereof, a lower support bracket adjustably mounted along a longitudinal span of said spacing member, and a saddle pivotally mounted in said lower support bracket to face said upper support structure and engageable with the specimen;
• said upper structure including a plurality of spaced and paired apertures formed as pairs in at least one end plate bordering an inner plate of said I-shape of said upper structure such that one aperture in each pair is on an opposite side of the inner plate;
• said upper support bracket further comprises a slider as a base portion center mounted at a distal end of a leg portion, and a pair of side walls projecting from opposite sides of said base portion, each side wall of said slider including a receiving slot formed therein for supporting said saddle of said upper structure.