The Design of a Semi-Prefabricated LVL-Concrete Composite Floor

Table 1

Experimental-analytical comparisons at ULS and SLS load levels for beams 1, 2, and 3 in terms of midspan deflection (Δ_𝑉), slip (Δ_𝐻), and shear force (𝐹_conn) in the most stressed notched connector, mid span bottom (𝜎_LVL) and top fibre (𝜎_conc) stresses in LVL and concrete, respectively.

Beam properties	Quantity		ULS			SLS
		Exp.	Analy.	Ratio of exp./analy.	Exp.	Analy.	Ratio of exp./analy.
Beam 1	Δ𝑉 (mm)	32.2	32.0	1.01	21.1	19.7	1.07
Single LVL	Δ𝐻 (mm)	0.71	—	—	0.31	—	—
R300 connection	𝐹conn (kN)	116	119	0.98	75.0	76.3	0.98
6 numbers	𝜎LVL (N/mm^2)	15.5	18.6	0.83	11.2	12.4	0.90
ULS = 55.5 kN	𝜎conc (N/mm^2)	8.55	10.7	0.80	5.72	7.15	0.80
SLS = 37.0 kN
Beam 2	Δ𝑉 (mm)	41.0	40.5	1.01	25.9	26.2	0.99
Double LVL	Δ𝐻 (mm)	0.72	—	—	0.36	—	—
R150 connection	𝐹conn (kN)	110	—	—	65.0	—	—
10 numbers	𝜎LVL (N/mm^2)	20.3	23.5	0.86	13.3	15.7	0.85
ULS = 138 kN	𝜎conc (N/mm^2)	10.9	13.5	0.81	7.47	9.02	0.83
SLS = 91.9 kN
Beam 3	Δ𝑉 (mm)	26.3	25.8	1.02	16.5	17.0	0.97
Double LVL	Δ𝐻 (mm)	0.56	—	—	0.21	—	—
P connection	𝐹conn (kN)	116	120	0.97	85.0	83.0	1.02
8 numbers	𝜎LVL (N/mm^2)	12.3	15.4	0.80	8.26	10.3	0.80
ULS = 92.2 kN	𝜎conc (N/mm^2)	9.52	8.92	1.07	4.93	5.95	0.83
SLS = 61.5 kN