Considering Soil-Foundation-Pier Interaction Analysis Of The Seismic Performance Of Bridge Piers

For the study of soil-foundation-pier interaction on seismic response of rei nforced concrete rectangular hollow pier,the integrated numerical model of soil-fo undation-pier with infinite element boundary was established by means of theoretica l derivation and numerical simulation.A three-dimensional finite element model of the pier system of soil structure interaction is considered using finite elemen t analysis software ABAQUS,studying the influence of soil-foundation-pier inte raction to the seismic response of bridge piers by means of dynamic analysis under El-Centro earthquake wave;truncated boundary and infinite element bou ndary were established to study the calculation efficiency of the integrated numeric al model of soil-foundation-pier with infinite element boundary,the computational e fficiency of infinite soil boundary model with soil-structure interaction is studied,Bas ed on this,the influence of soil-foundation-pier dynamic interaction on the seismic res ponses of piers with various natural periods was observed.Research shows that,the soil filter the seismic wave after in consideration of soil-foundation-pier interaction,the natural frequency decreases because of t his,the peak acceleration response and equivalent pier stress significantly decre ases,the horizontal displacement peak increased,and will lead to greater struct ural seismic damage;the integrated numerical model of soil-foundation-pier based o n infinite element boundary is more efficient than the other models when the soil-stru cture dynamic interaction is considered.Considering the soil-foundation-pier interacti on will lead to the stiffness reduction of the pier,which induces the increasing of displ acement response and decrease of acceleration response of the pier.With the increasin g of the natural period of the piers,the influence of soil-structure interaction on seismi c response of pier is more and more significant,and when the natural period of a pier i s larger than 0.1sec the effect of soil-structure interaction should not be neglected.