Floor design response spectrum of base-isolated structure
DANG Yu1, LI Guobao1, XIE Pengfei2
1. School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China;
2. Lanzhou Branch Office, Aerospace Long March Chemical Engineering Co., Ltd., Lanzhou 730050, China
Abstract:Based on the spectral characteristics of the floor response spectrum of base isolated structure, the spectral curve is divided into sections for regression analysis to determine the shape of the spectral curve of each section, and a double-peak floor design response spectrum of base isolated structure is obtained. Consider the main factors that affect the floor response spectrum of base isolated structure, such as the dynamic parameters of the seismic isolation structure, site characteristics, ground motion intensity, the interaction between the seismic isolation structure and the equipment, and equipment damping. Using the orthogonal experiment method, analyze the floor response spectrum of base isolated structure-equipment combination system. Taking the maximum goodness of fit as the goal, the characteristic parameters of the floor design response spectrum are calibrated section by section, and the calculation formula of each characteristic parameter is statistically fitted. Through the verification of three actual base isolated engineering-equipment examples, the results show that the established standardized floor design response spectrum can faithfully reflect the spectral characteristics of the floor response spectrum, restore the curve changes of the floor response spectrum, and the spectrum value of each section of the curve can better envelop the floor response spectrum. Compared with the results of time-history analysis method, the error of seismic action of each equipment obtained based on the floor design response spectrum is within 10%, indicating that the floor design response spectrum has high accuracy and good engineering practicability.
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