Shaking Table Test Of A Shear Wall Structure Subjiected To Random Ground Motions

Ground motion is a typical and complex and random phenomenon.It changes with time and space and has a very strong randomness.A seismic wave can be regarded as a sample of a random process,but even if they occur in the same location,two earthquakes with the same magnitude and the same seismic source on the same structure will not have the same structural response,that is,the ground motion is not reproducible.The research on the seismic performance of the existing shear wall structure shaking table test mainly focuses on the deterministic research.For this purpose,this paper carried out the shaking table test of the high-rise shear wall model structure under random earthquake action.First,in order to consider the randomness of ground motion,based on the orthogonal deployment theory,by constructing a random function form of standard orthogonal random variables,a probability model of non-stationary ground motion is established,and a function using a basic random variable is used to generate a random ground motion sample.Using a set of discrete representative points of a basic random variable,34 representative sample sets of a nonstationary ground motion with a given assigned probability can be generated as ground motion load input.Secondly,a 12-layer scale high-rise shear wall shaking table test scale model was produced by making a 1/5 scale,The random ground motion sample obtained according to the above method is similarly transformed and used as a mesa excitation,The vibration mode and damping ratio of the model structure are obtained through structural dynamic characteristics test,Based on the experimental results,the mean,variance,coefficient of variation,and probability density function of the structural dynamic amplification factor,floor shear force,and lateral displacement angle under the effect ofrandom ground motion are analyzed.At last,Using ABAQUS finite element software to analyze the seismic performance of shear wall model structure.The mean,variance,coefficient of variation,and probability density function of the dynamic amplification factor,floor shear force,and lateral drift angle obtained by numerical simulation agree well with the experimental results.The random seismic response of the structure shows obvious dispersion.The discreteness of the acceleration amplification factor increases with the increase of the floor,and the discreteness of the floor shear decreases with the increase of the floor.The reliability of the numerical analysis of the stochastic response of the structure is proved by the comparison of the random response and the probability information obtained from the analysis of the experimental and ABAQUS finite element software.