基于现场测试的剪力墙结构多阶自振周期经验公式研究

项目名称： 基于现场测试的剪力墙结构多阶自振周期经验公式研究

项目编号： No.51508531

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 建筑环境与结构工程学科

项目作者： 闫培雷

作者单位： 中国地震局工程力学研究所

项目金额： 20万元

中文摘要： 近年来剪力墙结构迅速发展，结构的高度逐渐增加，而现行规范给出的结构自振周期经验公式存在以下问题：(1)基本自振周期经验公式是基于50m 以下结构测试数据建立的，设计多由承载力控制，刚度偏大，如将该公式应用到更高结构上，其合理性和精度有待商榷；(2) 高于50m的剪力墙结构在地震中以弯曲变形为主，高阶振型在地震响应中所占的比重增大，现行规范仅给出了基本自振周期经验公式。拟基于100—150栋50m-180m高的剪力墙结构的现场测试数据，采用回归分析法研究影响结构动力性能的关键因素，重点分析场地软硬程度对结构自振周期的影响规律，给出结构多阶自振周期经验计算公式，研究不同破坏状态下的结构自振周期和阻尼比的变化规律。本项目的成果可用于验证建筑工程设计软件给出的各阶振型和周期的可靠性，在结构初步设计阶段简化计算和建筑物抗震鉴定中能充分考虑多阶振型对结构地震响应的影响，为结构的设计提供可靠依据。

中文关键词： 剪力墙结构；现场测试；自振周期；经验公式；回归分析

英文摘要： In recent years, the shear wall structure is rapidly expanding in China and the height of the shear wall structure increases gradually. The vibration period empirical formula of shear wall structure in the present specification exist the following problems: (1) the empirical formula of fundamental vibration period is given by the testing data of the structures below the height of 50 meters. The structures are designed by the control of bearing capacity; the stiffness of the structure is too large. If the formula is applied to the higher structure, its rationality and accuracy is questionable.(2) the shear wall structures exceeding the height of 50 meters based mainly on bending deformation in the earthquake, the proportion of which higher mode occupies in the seismic response greatly increased. The current specification only the basic vibration period empirical formula is presented. Proposed based on the 100-150 shear wall structure field test data, which height is between 50m and 180m. Regression analysis were carried out to study the key factors influencing the structure dynamic performance Especially analysis the influence law of soft and hard degree of structural vibration period, multi order experience formula to calculate the vibration cycle is given. The structure under different damage state change laws of vibration period and damping ratio is studied. The project results can be used for verification of the construction engineering design software is given by the reliability of the vibration mode and cycle. In preliminary design stage of structure simplified calculation and Seismic evaluation of buildings can give full consideration to the influence of the seismic responses of the structure mode. Design of shear wall structure are provided more reliable basis.

英文关键词： shear wall structure;field testing;vibration period;empirical formula;regression analysis