Study On The Bonding And Sliding Performance Of Bamboo Beam Components With Built-in Steel Plates

Reconstituted bamboo material is a high-performance bamboo-based composite material formed by reorganizing and strengthening bamboo.With its eco-friendly,renewable,and highstrength properties,it can be widely used as a primary structural material in engineering structures.Promoting and developing high-performance reconstituted bamboo structures not only helps reduce the use of concrete materials in existing structures but also decreases carbon emissions,which is significant for achieving China’s "dual carbon" goals.As a novel green bamboo-based engineering material,reconstituted bamboo is one of the first materials developed in China with independent intellectual property rights.It has excellent physical and mechanical properties and has been extensively promoted and applied in bamboo enterprises across various provinces.Green building materials,as a key industry field in China’s sustainable development,could be one of its essential breakthroughs.Reconstituted bamboo has high strength,good elasticity and plasticity,and excellent seismic performance.However,due to its low modulus of elasticity,it can easily deform under load,leading to deformation controlled by stiffness,preventing the full potential of the material’s performance.Therefore,special attention must be given to the deformation performance of reconstituted bamboo materials in structural design and construction.Currently,the elastic modulus of reconstituted bamboo components is mainly improved by forming composite components with other materials,such as externally bonded fiber composites.However,this method requires secondary processing,increasing the construction period,and the synergistic performance between different materials cannot be guaranteed.To solve these problems,this paper proposes a novel component,in which steel plates are directly embedded in the reconstituted bamboo during the manufacturing process,eliminating the need for post-processing grooving and further enhancing the overall performance of the composite component.This study investigates the effects of steel plate thickness and anchorage length on the bonding and anchorage performance of embedded steel plate reconstituted bamboo components.The main research contents and results are as follows:(1)A total of 18 reconstituted bamboo specimens with six different working conditions were tested under axial tension,summarizing the effects of steel plate thickness and bonding length on the bonding-slip performance of reconstituted bamboo components.For specimens with the same steel plate thickness,increasing the bonding length can increase the initial ultimate load by3.5%-8.9% and the anchorage stiffness by 11.35%-73.8%.For specimens with the same bonding length,increasing the steel plate thickness can significantly increase the initial ultimate load by31.7%-71.1% and the anchorage stiffness by 4.3%-69.6%.For slip stiffness,increasing the bonding length within a certain range can effectively improve the slip stiffness.(2)ABAQUS was used to simulate the embedded steel plate reconstituted bamboo components,and the finite element and experimental ultimate loads and load-slip curves were compared and analyzed.The results show that finite element analysis can accurately simulate the stress distribution,ultimate bearing capacity,and bonding-slip relationship of reconstituted bamboo components.(3)The bonding-slip relationship curves of different specimen groups were analyzed to explore the bonding-slip mechanism of various reconstituted bamboo specimens.Based on the summary of existing bonding-slip models,a bonding-slip relationship model suitable for embedded steel plate reconstituted bamboo was proposed and verified by experimental data for its feasibility.By analyzing the parameters of the model,the physical meaning of each parameter was revealed.