Analyses on Prestress Loss and Flexural Performance of the Laminated Bamboo Beam Applied with Prestressed BFRP Sheet

Table 3

Specimens for measuring the prestress loss.

Label	b × h × l (mm)	F0 (kN)	bf (mm)	ε0	Preparation stage	Storage stage
P-1	50 × 150 × 2978	12.02	51.2	10820	2-9 11 : 38 to 2-13 9 : 09	—
P-2	50 × 150 × 2978	12.54	51.9	11135	2-18 10 : 45 to 2-24 9 : 08	2-24 9 : 08 to 3-03 8 : 11
P-3	50 × 150 × 3000	12.54	51.1	11310	3-03 11 : 35 to 3-10 8 : 55	3-10 8 : 55 to 3-14 8 : 55

Note. F₀ is the actual load applied at the tensioned end, which is the target initial prestressed force; b_f is the width of the BFRP sheet; ε₀ is the calculated initial strain caused by the initial prestressed force; 2-9 11 : 38 means the data were monitored at 11 : 38 on February 9.