Response Analysis Of Plane Frame Structure Under Velocity Pulse Seismic Action

At home and abroad,experts and scholars have studied the seismic response of reinforced concrete frame structures under the action of near-fault earthquakes.The seismic response of the concrete-filled steel tubular column-H-steel composite beam frame structure is relatively small.It is necessary to study the frame structure of concrete-filled steel tubular column-H-shaped steel composite beam.The research contents and results are as follows:A finite element model was established for the frame structure using finite element analysis software ABAQUS and the response analysis under near-fault velocity pulse earthquake was performed.Six sets of seismic waves are selected in the PEER database.The selected six seismic waves are numbered RSN143,RSN149,RSN316,RSN1050,RSN1148 and RSN4102.Each group of seismic waves includes velocity pulse direction and no velocity pulse direction.Each frame of the seismic structure is loaded with a frame structure model.The main research is the inter-layer lateral displacement,permanent lateral displacement,first-layer column bottom shear force,first-layer column bottom bending moment and structural deformation.For the frame structure of this paper,under the seismic records RSN143,RSN149,RSN316,RSN1050,RSN1148 and RSN4102,there are velocity pulses and no-velocity pulsed seismic waves,respectively.The maximum value of the lateral displacement and the average value of maximum value of the lateral displacement of the structure under the action of seismic velocity pulse are all increased.The average value of the maximum value of the lateral displacement of the first layer of the structure is 6.53%,17.90%,34.11%,5.75%,58.92%,and 2.54%,respectively.For the frame structure of this paper,under the action of seismic pulse RSN149,RSN316 and RSN1148,there are velocity pulse and no velocity pulse seismic wave respectively.There is an increase in the permanent lateral displacement between the layers.The average increase of the permanent lateral displacement between the first layer of the structure is 11.87%,66.17%,and 61.82%,respectively.The calculation results of the seismic wave with velocity pulse is compared with that of the seismic wave without velocity pulse.In the case of seismic waves with velocity pulses,the average value of the relative lateral shift of each layer of the structure increases,especially in the second and third layer.For the frame structure of this paper,under the action of the seismic records RSN143,RSN149,RSN316 and RSN1148,there are velocity pulses and no-velocity pulsed seismic waves,respectively.Under the action of seismic waves,the shear at the bottom of the column and the bending moment at the bottom of the column are all increased.The proportion of the shear strength at the bottom of the column is 17.83%,5.07%,63.38%,and 40.18%,respectively.The proportion of the bending moment at the bottom of the column is 16.36%,6.95%,55.69%,and 36.49%.The structure of the seismic wave loaded with the velocity pulse direction has a large plastic permanent deformation.The stress at the beam-column joint of the structure is greater than the stress at the non-node,and the stress at the center pillar and the beam joint is greater than the stress at the joint between the pillar and the beam.