Study On Mechanical Behaviorof Large Section Glulam Splicing Joints And Curved Beams

Today,with emphasis on sustainable development,people’s green environmental protection concept is getting stronger and stronger,and more attention is paid to energy consumption and environmental pollution.Construction activities are the main source of environmental pollution in the world,and they consume 50% of global energy consumption.Above,in order to reduce the energy consumption and environmental pollution caused by construction activities,it is undoubtedly one of the best methods to select the most natural and green building materials in the building.At the same time,with the continuous development of glulam technology,glulam The mechanical properties are greatly improved,and various shapes and sizes can be manufactured according to the actual needs of the project;based on the above background,the wooden structure begins to develop toward large-span and multi-tall buildings;and in the largespan spatial wooden structure,the nodes are the entire wooden structure design.In the important part,it often needs to bear large rigidity,bending moment and shearing force.In the modern large-span space wood structure,the embedded steel plate pin connection node is often used to meet the design requirements for strength and rigidity.Lack of a thorough understanding of this type of node,so the force on the in-line steel pin connection Can study has important significance.In this paper,the ideal rigid-plastic assumption is used to derive the calculation formula of the failure mode and bearing capacity of the two steel plates.The destructive mode of the large-section glulam joints is derived by using the derivation formula.The large-section glulam splicing joints with two steel plate pin connections are designed to test the bending resistance.The failure mode and failure mechanism of the large-section glulam splicing joints are obtained through experiments.The test failure mode is consistent with the calculation results.At the same time,the load-span middisplacement curve of the extraction node is the basis for the analysis of the key parameters of the next part of the numerical simulation and the large-section glulam splicing node geometry domain.The finite element model of large-section glulam splicing joints was established by finite element analysis software ABAQUS.In this paper,the wood was simplified to a transversely isotropic ideal elastoplastic material,and different constitutive models of different material parameters were established for different stress regions.Including the constitutive model of the common area and the hole area(the elastic modulus of the constitutive model of the bolt and the steel pin area is reduced),the constitutive model is used to simulate the large-section glulam splicing node,and the finite element model is selected on the basis of correctness.The multi-group parameters were used to analyze the geometric key domain parameters of the joints.The effects of parameters such as the diameter of the pin joints,the thickness of the steel plate and the number of steel plates on the performance of the joints were studied.The splicing joints were applied to the 30 m long-span vibrating wood string bending beam,and the bending performance test of the 1:1 full-scale model was carried out to study the working mechanism,overall stability and macroscopic response of the full-size glulam beam.At the same time,the working state of the bolt group of the large section joint node is investigated.