Behaviour of embedded steel plate in composite coupling beams

A unified design approach for plate-reinforced composite coupling beams

“…The design procedure of PRC coupling beams described in this section is applicable to normal practical ranges of span/depth ratios (1 ≤ l/h ≤ 4) and plate depth/beam depth ratios (0.95 > h p /h > 0.8) which are in line with the previous experimental and parametric study [12][13][14][15][16].…”

“…In the parametric study [16], the tensile force F x was found to be dependent on the steel ratio of the longitudinal bars, the plate thickness to beam width ratio, and the span/depth ratio of the beam. The plots of F x /V u against l/h with various steel ratios ρ s are reproduced in Fig.…”

“…The steel plate is required to take up the additional shear when the design ultimate shear V u exceeds the maximum allowable shear in the RC component V RC,allow , which varies depending on the concrete grade. Numerical investigations [16,18] revealed that the load shared by the steel plate should not be more than 0.45V u even for beams with a small span/depth ratio and embedded with a thick plate. Thus the plate shear demand V p,req is expressed as…”

“…Horizontal forces F x would be exerted on the RC part and the steel plate respectively in equal magnitudes but at opposite directions. The previous numerical and experimental investigations [16][17][18][11][12][13][14][15] found that beam-wall joints are the most critical location for the plate design and yielding often occurs at the ultimate loading stage. The simplified stress blocks of member forces at beam-wall joints are shown in Fig.…”

“…Design models of simplified bearing stress distribution in the plate anchorage were proposed [13,14]. Nearly one hundred non-linear finite element models of hypothetical PRC coupling beams with different ratios of clear span length to overall depth 1 ≤ l/h ≤ 4 and steel plate depth to overall beam depth 0.95 > h p /h > 0.8 were analyzed [16,17] behaviours of shear studs in the embedded beam region and in wall regions. The effects of the variations in span/depth ratio, plate anchorage length, plate thickness and longitudinal reinforcement ratio were investigated.…”