The Micro Vibration Of Urban Rail Transit Impact On Ancient Building

According to the research of the national cultural relic- Xi'an Bell Tower, the impact of the ground traffic slight vibration induced by the upcoming construction and operation of Xi'an urban rail on the ancient architecture was analysed, and based on the allowable value in GB/T50452 ancient building protection standards, the way of running was proposed to protect the Bell Tower. The main contents are as follows:(1)By analysing the infinitesimal of the beam and column, which is the basic load-bearing elements, the deflection curve equation of the timber beams and wooden pillars was derived. With the spring as the constraint of the tenon joints, and inputing boundary conditions, the stiffness of the tenon joints was derived. Making use of the finite element software ANSYS to build the finite element model, the calculation results are in good agreement with the experimental dates, and the proposed method applied to the analysis and calculation for the stiffness of the tenon joints in wooden ancient buildings.(2)The high-station base is an important part of many ancient buildings, this paper has studied the impact of the high-station base on the upper structure. Different heights of the station base, cross-section forms, and the internal fixed value of initial elastic modulus have been taken to establish the finite element model of the high-station base with the upper wooden structure interaction, and the impact of different parameters on the different vibrating modes of the upper part of wooden structure was obtained, and compared with the self-vibration frequency of the wooden structures with no high-station base. The results showed that the high-station bases which with different parameters has significant different impacts on the dynamic effects of the upper wooden structure.(3)The model of the three-dimensional vertical load and the single load had been analysed by ways of SRSS, the effect of two different operation modes -- the second line and the sixth line on the vibration of the Bell Tower was analysed..(4)The impact of the second line subway's Bell Tower station on the vibration of the Bell Tower was considered for the first time. By compared with the vibration amplitudes of the Single-start acceleration run, two-speed operation and uniform operation, it was showed that the vibration of the Bell Tower should consider the impact of the site.(5)On the base of using the floating slab track for isolation, compared the damped vibration amplitude and the allowable values, reasonable running recommendation were suggested for the subway.