Stability of continuous composite plate girders with Umframe action R. P. Johnson, MA, FEng, FICE, FIStructE, Shiming Chen, BSc, MSc,PhD and W Tests are reported on two half-scale twin Proc. Instn Ciu. Engrsstructs& Bldgs, 1993. 99. May. 187-197 Siruciural Board Paper 10120 double-cantilever girders with class 4 webs. In one, lateral stability of the bottom flanges was provided by continuous.U-frameaction; and inthe other, by discrete U-frames that included the shear connection and the concrete slab, which was reinforced the deck ofa as highway bridge... Stability of continuous composite plate girders with Umframe action R. P. Johnson, MA, FEng, FICE, FIStructE, Shiming Chen, BSc, MSc,PhD and W Tests are reported on two half-scale twin Proc. Instn Ciu. Engrsstructs& Bldgs, 1993. 99. May. 187-197 Siruciural Board Paper 10120 double-cantilever girders with class 4 webs. In one, lateral stability of the bottom flanges was provided by continuous.U-frameaction; and inthe other, by discrete U-frames that included the shear connection and the concrete slab, which was reinforced the deck ofa as highway bridge...