【摘要】：采用混凝土壩的實測振動響應(yīng)識別結(jié)構(gòu)模態(tài)參數(shù)是進行結(jié)構(gòu)動力特性研究的一種可行的方式。基于混凝土壩的強震觀測數(shù)據(jù),提出采用矢量自回歸滑動平均模型(Auto-Regressive Moving Average Vector,ARMAV)和穩(wěn)態(tài)圖法來進行混凝土壩結(jié)構(gòu)模態(tài)參數(shù)識別。研究了結(jié)構(gòu)實測振動響應(yīng)時間序列的ARMAV模型表達(dá)形式,并通過引入輔助變量(Instrumental Variable,IV)技術(shù),來求解模型中的未知系數(shù);通過研究ARMAV模型系數(shù)矩陣與結(jié)構(gòu)系統(tǒng)矩陣的關(guān)系,以便為結(jié)構(gòu)模態(tài)識別提供理論依據(jù);根據(jù)綜合了各測點觀測信息的平均標(biāo)準(zhǔn)化功率譜(Average Normalized Power Spectrum Density,ANPSD)來對傳統(tǒng)的穩(wěn)態(tài)圖法進行改進,以實現(xiàn)強震激勵下混凝土壩的系統(tǒng)定階和虛假模態(tài)剔除。通過一個數(shù)值算例和一個工程實例,驗證了提出的基于強震觀測和ARMAV模型的結(jié)構(gòu)模態(tài)參數(shù)識別方法的精度、有效性和工程適用性。
[Abstract]:It is a feasible way to study the dynamic characteristics of concrete dam by using the measured vibration response to identify the modal parameters of the structure. Based on the strong earthquake observation data of concrete dam, the vector autoregressive moving average model (Auto-Regressive Moving Average Vector,ARMAV) and steady-state diagram method are used to identify the modal parameters of concrete dam structure. The expression form of ARMAV model for the measured vibration response time series of structures is studied, and the unknown coefficients in the model are solved by introducing auxiliary variable (Instrumental Variable,IV) technique. The relationship between the coefficient matrix of ARMAV model and the matrix of structural system is studied in order to provide a theoretical basis for modal identification of structures. According to the average standardized power spectrum (Average Normalized Power Spectrum Density,ANPSD), the traditional steady-state diagram method is improved to realize the systematic determination of order and elimination of false modes of concrete dam under strong earthquake excitation. Through a numerical example and an engineering example, the accuracy, effectiveness and engineering applicability of the proposed modal parameter identification method based on strong earthquake observation and ARMAV model are verified.
【作者單位】： 西安理工大學(xué)西北旱區(qū)生態(tài)水利工程國家重點實驗室培育基地;河海大學(xué)水文水資源與水利工程科學(xué)國家重點實驗室;
【基金】：國家自然科學(xué)基金項目(51409205) 博士后自然科學(xué)基金項目(2015M572656XB) 陜西省重點科技創(chuàng)新團隊(2013KCT-015) 水文水資源與水利工程科學(xué)國家重點實驗室開放研究基金(2014491011)
【分類號】：TV642;TV312

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