Study On Seismic Performance Of Reinforced Concrete Hollow High Pier

Under the guidance of the important thought of"One Belt And One Road"construction of the party central committee,China’s infrastructure construction is developing in full swing.Due to the improvement of construction technology,makes the high hollow pier is widely used in the construction of bridge engineering in our country,especially in China,great western unique topographical features will be high bridge pier construction to a whole new level.Therefore,the hollow high pier structure has become the research focus of experts and scholars.In this paper,the seismic performance of reinforced concrete hollow high pier structure is analyzed as the research background,and the wall thickness factor is selected as the reference variable.Based on ABAQUS finite element software,the vibration characteristics and seismic performance of reinforced concrete hollow high pier structure with wall thickness factor are studied in depth.The main work of this paper is as follows:(1)Based on the Euler-Bernoulli beam theory and the elastic assumption of uniform equivalence,the formula of the natural vibration frequency of the hollow high pier is derived,and the functional relationship between the natural vibration frequencyf_n of the hollow high pier and the wall thickness coefficientf_n is explored.The accuracy of ABAQUS software was verified by numerical simulation analysis.(2)By studying the functional relationship between the natural vibration frequencyf_n of hollow high pier and the wall thickness coefficientβ,the variation rule of the wall thickness on the vibration characteristics of reinforced concrete hollow high pier structure is understood,that is,the increase of the wall thickness coefficientβleads to the decrease of the natural vibration frequencyf_n of the structure,and the decrease of wall thickness coefficientβleads to the increase of the natural vibration frequencyf_n of the structure.The accuracy is verified by the numerical simulation analysis of ABAQUS software.(3)Based on the theoretical analysis model,a simplified finite element model of line element is established,which can quickly calculate the natural frequencies of the first few orders with large length and fineness,such as hollow high pier,and compare it with the corresponding fine model of solid element to verify the rationality of the finite element model of line element from the Angle of error.(4)Full scale was established through finite element of reinforced concrete hollow high pier refinement entity unit model for numerical simulation analysis,respectively,to analyze the vertical bearing capacity,low cycle loading analysis,a push-over analysis and dynamic time history analysis.from the hysteresis curve,lateral force,ductility,multi-angle analysis such as time history response and energy dissipation ability of different wall thickness,the seismic performance of reinforced concrete hollow high pier structure change rule.the results showed that with the increase of wall thickness,the structure of the vertical bearing capacity,lateral and basal maximum shear bearing capacity were significantly improved,and the ductility,energy dissipation capacity,displacement of pier top largest also decreased to different degrees.(5)Through the numerical simulation and comparative analysis of several groups of hollow high pier finite element models with different wall thickness,the results show that the rectangular hollow high pier with wall thickness coefficientβwithin the range of0.25-0.40 has good vertical and lateral bearing capacity,ductility,energy dissipation capacity and time history response under the action of 7-degree E2 earthquake.