A Study of Damping Predictor of Buildings

许多组织已经积累了各种条件下建筑物的可靠的高质量全尺寸减振数据。从许多期刊和会议记录中收集了更多的阻尼数据。对建筑物动态特性的所有数据进行了修正，以确认测量值，并获得必要的信息，特别是关于测量和评估技术、振动幅度以及详细的建筑物信息。当观测到较大幅值的风振响应时，还采用随机减量技术对结构的减振效果进行了评估。一种改进的条件期望使随机减量技术能够估计幅度相关性，并推导出按峰值幅度排序的随机减量技术。通过该方法，可以清晰有效地评估结构自振周期和阻尼比的幅值相关性，并在数据库的基础上分析了阻尼率与建筑性能的关系，特别是在大幅值区域。在此基础上，提出了一种阻尼预报器来评估系统的动力学特性、频率和幅值相关性的非线性行为。建立了准确的阻尼器预测模型，以帮助设计人员根据建筑特性估算阻尼率。

Reliable high-quality full-scale damping data on buildings of various conditions have been accumulated from many organizations. Additional damping data have been collected from many journals and proceedings. All data on the dynamic properties of buildings have been amended to confirm the measured values, and to obtain necessary information, especially on measurement and evaluation techniques and vibration amplitudes as well as detailed building information. Reliable data have consequently been selected and are contained in the database.When wind-induced responses with large amplitude were observed, structural damping has also been evaluated by using random decrement technique. A modified conditional expectation enabled the random decrement technique to estimate amplitude dependencies, and derived the random decrement technique ranked by the peak amplitude. By using the proposed technique, the amplitude dependencies of the natural period and the damping ratio were clearly and efficiently evaluated.Relations between damping ratios and building properties were analyzed based on the database, especially in a large-amplitude regime. Then, a damping predictor was proposed to assess nonlinear behaviors of the dynamic properties, frequency and amplitude dependency. The accurate predictor model for damping was established to aid designers in estimating damping ratios, based on building properties.