Shake Table Test For Reinforced Concrete Hollow Rectangular Pier

With the rapid development of infrastructure construction in China,the application of high-rise pier is more and more extensive,and the hollow section occupies a large proportion in the high-rise pier.The design of hollow section is not clearly stipulated in the code in China,and the design principle of solid section is often used in practical design.At present,the research on hollow section piers in China is mainly about circular section.The research of hollow rectangular section mostly adopts quasi-static test method,and the pseudo-static test will ignore the effect of strain rate on concrete performance.Therefore,it is of great significance to study the seismic behavior of reinforced concrete rectangular hollow bridge pier by shaking table test.The main contents of this paper are as follows:(1)Two reinforced concrete rectangular hollow bridge piers with different reinforcement ratios were tested by seismic simulation shaking table.The experimental results show that the pier has good vertical bearing capacity.Under the excitation of the same intensity seismic wave,the maximum acceleration value of the of EI wave,the natural vibration frequency of M2 is larger than M1.(2)The finite element models of M1 and M2 are established by using the general finite element software ABAQUS,and El-centro wave,Taft wave and Lanzhou wave are applied to the specimen.By comparing the calculated values of acceleration and displacement with the experimental values,it is found that the calculated values and experimental value are in good agreement with each other.The feasibility of the finite element model is verified.(3)Seven finite element models are established with the use of ABAQUS to study the effects of axial compression ratio,hoop ratio and longitudinal reinforcement ratio on the vibration response of piers.Based on the calculation results,the effects of the three factors on the pier top acceleration,pier top displacement,magnification factor,energy dissipation,equivalent plastic strain and natural vibration frequency are analyzed.