## 2 Test of Binder Ratio and Mechanical Properties of Fiber-Reinforced Bamboo Substrate
### Fabrication and Performance Test Analysis of Fiber-Reinforced Bamboo Substrate
#### 2.3.2 Performance Test and Results of Fiber-Reinforced Bamboo Substrate  
Flexural strength was tested in accordance with the \"Test Method for Fiber Cement Products\" (GB/T 7019-2014) [30]. A universal testing machine was used to conduct two flexural strength tests on each specimen [31], as shown in Figure 5. The second flexural strength test involved reassembling the damaged specimens according to the fracture section after the first test and loading them in a direction perpendicular to the loading direction of the first test. Due to the single-layer bamboo board, the bending resistance of the plate varies with the direction of the bamboo fiber, leading to significant differences in the test results. The strength of the vertical bamboo fiber section is higher, while the strength of the horizontal bamboo fiber section is lower. Consequently, the data results of a sheet were averaged based on the low and high values from the two tests [32] to obtain the bending strength of the longitudinal and vertical bamboo fiber cross-sections. The flexural strength test of the fiber-reinforced bamboo board shows that the average bending strengths of the plate segments in the direction of bamboo fibers and perpendicular to the direction of bamboo fibers are 15.71 MPa and 34.64 MPa, respectively. The changes during the loading process of the specimens demonstrate that the glass fiber cloth has excellent strength reserves. After the MOC bonding of the bamboo strips, the board maintains good flexural resistance. During the bending property test of the section of the board in the direction of the bamboo fiber, the external tension side of the MOC first cracked with an increase in the applied load, followed by the MOC of the glass fiber cloth, and finally breaking at the MOC cement between the bamboo fibers. This demonstrates that the glass fiber and MOC are the primary load-bearing components when the section is stressed in the direction of the bamboo fiber, while the bamboo material contributes when the section is  
Figure 4: Structure of fiber-reinforced bamboo composite board: (**a**) bamboo strip distribution; (**b**) distribution of fiberglass cloth; (**c**) MOC distribution; and (**d**) composite plate sample. stressed perpendicular to the bamboo fiber. The mechanical properties of the plate thus exhibit anisotropy. Through the experimental results, the fiber-reinforced bamboo board demonstrates excellent flexural resistance. The board meets the strength requirements of grade R3 as stipulated in \"Fiber cement flat sheets--Part 1: Non-asbestos fiber cement flat sheets\" (JC/T 412.1-2018) [33]; it provides conditions for analyzing the mechanical properties of walls and floor slabs made of this board. 3 Numerical Simulation of Fiber-Reinforced Bamboo Substrate and Comparison with Experimental Results  
ABAQUS is a powerful and widely recognized finite element analysis software--particularly in the field of nonlinear analysis--that has been extensively utilized in various countries [34]. In this study, ABAQUS 2024 was employed to model the fiber-reinforced bamboo board and its components. The internal structure of this type of plate consists of three components--bamboo strips, glass fiber cloth, and MOC--all simulated using solid units and assigned corresponding material properties. The geometric modeling of bamboo strips involves selecting eight strips measuring 240 mm \(\times\) 30 mm \(\times\) 5 mm, arranged with a 1 mm gap in the middle, which is filled with MOC. The arranged bamboo strips are wrapped in glass fiber cloth with a thickness of 0.16 mm, and the wrapped model is filled with MOC around it to achieve the desired thickness. The dimensions of the fiber-reinforced bamboo board are shown in Figure 6a. The substrate is constrained at both ends, consistent with the test setup, and the load is applied in both the direction of the bamboo fiber and along the bamboo fiber direction, as shown in Figure 6b. Figure 5: Folding test of fiber-reinforced bamboo substrate.