Seismic Performance Analysis Of Frictional Energy Dissipating Trusses

With the national promotion of steel structure,the staggered trusses system has received great attention and application in the construction industry due to its advantages of green,cost-effective,fast and high efficiency.However,the staggered trusses has poor ductility and energy dissipation because the hollow web chord is the main energy dissipation part under the action of lateral force and the diagonal web is prone to yielding phenomenon.To solve this problem,this paper proposes to replace the upper chords of the structure with frictional energy dissipating combination chords to form a new structural form-frictional energy dissipating trusses.The friction-dissipative trusses can make full use of the energy dissipation capacity of the friction-dissipative chord and at the same time,the lateral resistance of the conventional trusses.In order to study the seismic performance of friction dissipation trusses structure,the work of this paper mainly includes.(1)Using the finite element software ABAQUS,a finite element model of the frictional dissipative trusses structure is established by selecting the appropriate material ontology and cell type.The same modeling method is used to build the reference test model and compare with its test results to verify the correctness and feasibility of the finite element modeling method in this paper.(2)To analyse the seismic performance of the frictional energy dissipating trusses,ABAQUS was used to carry out monotonic and cyclic loading calculations and to analyse the mechanical properties of the structure such as stiffness,ultimate load capacity,ductility and energy dissipation capacity by comparing with the conventional trusses.The results show that under monotonic loading,the frictional energy dissipation staggered trusses has better ultimate load capacity and ductility compared to the conventional staggered trusses.Under cyclic loading,the hysteresis curve of friction dissipative staggered trusses is parallelogram with no obvious pinching phenomenon,and the hysteresis curve is fuller,with better energy dissipation capacity and better load carrying capacity and ductility.(3)Compare and analyse the influence of main parameters on the seismic performance of the structure,and establish multiple models to analyse the influence of parameters such as hole slot size,friction coefficient,bolt preload,number of bolts and web section size on the structural performance.The results of the analysis show that: the size of the hole slot,the friction coefficient and the preload force have a greater influence on the energy dissipation capacity;the size of the hole slot has a greater influence on the stiffness in the slip and compression stages,and the friction coefficient,the bolt preload force and the number of bolts have a greater influence on the initial stiffness.The number of bolts has a certain influence on the load carrying capacity.