Behaviour and Optimization Aids of Composite Stiffened Hypar Shell Roofs with Cutout under Free Vibration

Table 3

Values of “𝑝” for 0/90/0/90 hypar shell.

Boundary conditions	Cutout size (𝑎^/𝑎)
	0	0.1	0.2	0.3	0.4
CCCC	0	1.67	−0.20	−1.76	−3.56
CSCC	0	1.04	−0.47	−2.26	−4.2
CCSC	0	0.95	−0.60	−2.54	−4.56
CCCS	0	−1.02	−0.47	−2.32	−4.22
CSSC	0	0.0	−1.97	−5.43	−9.42
CCSS	0	0.0	−1.94	−5.41	9.41
CSCS	0	12.48	21.21	27.74	27.51
SCSC	0	12.17	21.25	29.32	28.51
CSSS	0	12.70	19.87	24.70	23.50
SSSC	0	12.67	19.92	24.99	23.75
SSCS	0	12.77	19.87	24.68	23.49
SSSS	0	13.61	21.53	29.00	32.20

𝑎/𝑏=1, 𝑎/ℎ=100, 𝑎^/𝑏^=1, 𝑐/𝑎=0.2; 𝐸₁₁/𝐸₂₂ = 25, 𝐺₂₃=0.2𝐸₂₂, 𝐺₁₃=𝐺₁₂=0.5𝐸₂₂, 𝜈₁₂=𝜈₂₁=0.25, 𝑏_st/ℎ=1, 𝑑_st/ℎ=2. Each stiffener has a single lamina with fibres along its length.