本文關(guān)鍵詞： 混合試驗(yàn) 本構(gòu)模型 系統(tǒng)辨識(shí) 參數(shù)估計(jì) 模型更新　出處：《哈爾濱工業(yè)大學(xué)》2015年博士論文　論文類型：學(xué)位論文

【摘要】：混合試驗(yàn)綜合了數(shù)值模擬和物理試驗(yàn)的優(yōu)點(diǎn),是研究結(jié)構(gòu)動(dòng)力反應(yīng)的有效方法之一。子結(jié)構(gòu)技術(shù)的應(yīng)用使混合試驗(yàn)在評(píng)估大型復(fù)雜結(jié)構(gòu)抗震性能上具有很大的潛力。但是當(dāng)前的子結(jié)構(gòu)混合試驗(yàn)還存在較大模型誤差:一方面源自結(jié)構(gòu)的計(jì)算模型和數(shù)值單元過于簡(jiǎn)化,如用層模型及構(gòu)件層次本構(gòu)來描述框架結(jié)構(gòu);另一方面源于數(shù)值子結(jié)構(gòu)模型參數(shù)的不確定性,如用假定的數(shù)值模型來描述大型復(fù)雜結(jié)構(gòu)中無法進(jìn)行試驗(yàn)又可能進(jìn)入非線性的構(gòu)件,當(dāng)這種數(shù)值模型在結(jié)構(gòu)中所占比例較大時(shí),混合試驗(yàn)的優(yōu)勢(shì)就消失了。為了減少子結(jié)構(gòu)混合試驗(yàn)中的兩類模型誤差,有必要采用合理的計(jì)算模型和精細(xì)的數(shù)值單元;可以而且應(yīng)該利用試驗(yàn)子結(jié)構(gòu)觀測(cè)數(shù)據(jù)實(shí)時(shí)辨識(shí)預(yù)設(shè)數(shù)值模型的參數(shù),并在線更新數(shù)值子結(jié)構(gòu)中相應(yīng)部分的模型。這兩個(gè)解決方案還要求有基于有限元軟件的混合試驗(yàn)系統(tǒng)提供技術(shù)支撐。本文以框架結(jié)構(gòu)為研究對(duì)象,以減少模型誤差提高試驗(yàn)精度為宗旨,提出了基于截面屈服面模型更新的框架結(jié)構(gòu)混合試驗(yàn)方法,主要內(nèi)容和結(jié)論如下:(1)提出了梁柱單元中考慮軸力彎矩耦合的截面本構(gòu)模型。根據(jù)截面組合思想構(gòu)建了軸力與彎矩的屈服面,并基于經(jīng)典塑性理論建立了截面本構(gòu)模型;闡述了截面狀態(tài)確定和本構(gòu)關(guān)系積分的方法;編寫了基于MATLAB的桿系有限元非線性分析程序。研究表明,該截面本構(gòu)模型不但能考慮軸力存在及變化對(duì)截面抗彎承載力的影響,而且具有隨動(dòng)、等向及混合強(qiáng)化的特性。此外,與塑性鉸模型和纖維截面模型結(jié)果的比較表明所提截面模型能兼顧計(jì)算精度和效率。(2)提出了梁柱單元中截面本構(gòu)模型參數(shù)的識(shí)別方法。以框架柱為辨識(shí)對(duì)象,提取其基本坐標(biāo)系下桿端位移和力為輸入和輸出信息,并預(yù)設(shè)基于力的單元和截面本構(gòu)為框架柱的數(shù)值模型;采用unscented Kalman Filter(UKF)純參估計(jì)和雙重估計(jì)模式進(jìn)行辨識(shí);分析了UKF純參數(shù)估計(jì)性能對(duì)初值與噪聲的選擇的敏感性,并探討了有無模型誤差下兩種估計(jì)模式的識(shí)別效果。研究表明,UKF算法在識(shí)別梁柱截面本構(gòu)模型參數(shù)時(shí)具有較高的精度、魯棒性和計(jì)算效率。(3)建立了基于有限元并考慮模型更新的混合試驗(yàn)系統(tǒng)架構(gòu)。分析了兩環(huán)混合試驗(yàn)系統(tǒng)架構(gòu)存在的問題并搭建了一個(gè)混合試驗(yàn)系統(tǒng)仿真平臺(tái);研究了基于有限元軟件的三環(huán)混合試驗(yàn)系統(tǒng)架構(gòu),總結(jié)了MATLAB有限元與中間環(huán)d SPACE間數(shù)據(jù)的通信,擴(kuò)展了中間層d SPACE以包含命令的插值、邊界的控制等功能;提出面向單元并考慮在線模型更新的桿系結(jié)構(gòu)混合試驗(yàn)系統(tǒng)架構(gòu)。研究表明,所提出的仿真平臺(tái)和試驗(yàn)架構(gòu)是可行的,有效的。(4)開展了常規(guī)混合試驗(yàn)及考慮在線模型更新的混合試驗(yàn)。以平面鋼框架為研究對(duì)象,以桿系結(jié)構(gòu)為計(jì)算模型并明確了靜動(dòng)力分析算法;設(shè)計(jì)了足尺框架柱試驗(yàn)子結(jié)構(gòu),研究了三個(gè)作動(dòng)器加載模式和測(cè)量方案;開展了面向單元的框架結(jié)構(gòu)常規(guī)混合試驗(yàn)和考慮在線模型更新的混合試驗(yàn)。研究表明,三個(gè)作動(dòng)器加載模式能實(shí)現(xiàn)平面框架柱的邊界條件,常規(guī)子結(jié)構(gòu)混合試驗(yàn)對(duì)大型框架結(jié)構(gòu)優(yōu)勢(shì)不太明顯,而考慮在線模型更新的混合試驗(yàn)?zāi)艽蠓岣咴囼?yàn)精度。
[Abstract]:Hybrid testing combines the advantages of numerical simulation and physical experiment, is one of the effective methods to study dynamic response of structure. The application of Substructure Hybrid Test in the assessment of potential seismic performance of large complex structures. But the Substructure Hybrid test current is still large model error: on the one hand from the model and numerical simulation the unit structure is too simplified, such as the use of layer model and component level constitutive description of frame structure; on the other hand from the numerical substructure model parameter uncertainties, such as the numerical model is assumed to describe the component test can not be carried out in large and complex structures may enter the nonlinear, when a larger proportion of the numerical model accounted for in the structure, the hybrid testing advantage disappears. In order to reduce the model error of two kinds of Substructure Hybrid test, it is necessary to adopt reasonable calculation model And the numerical unit can and should be fine; by using the parameters of the experimental substructure observation data real-time identification of preset numerical model, and the online update corresponding part of the numerical substructure model in two. This solution also requires a hybrid test system based on finite element software to provide technical support. Based on the frame structure as the research object, in order to reduce the error of the model for the purpose of improving the accuracy of the test, put forward a framework of hybrid testing method based on the updated section yield surface model, the main contents and conclusions are as follows: (1) proposed constitutive model of section beam column element considering axial force bending moment coupling of the senior high school entrance examination. According to the section combined to construct the yield surface of axial force and bending moment and, based on the constitutive model of section established the classical plasticity theory; expounds the section state determination and constitutive relation of integral method; preparation of finite element non line based on MATLAB Analysis of the program. The results show that the section constitutive model can not only consider the existence and change of the axial force effect of flexural bearing capacity of cross section, and with follow-up, to strengthen and mixed characteristics. In addition, with the plastic hinge model and fiber section model results show that the proposed model can take into account the section the accuracy and efficiency of computation. (2) proposed recognition method of constitutive model parameters of beam and column in the unit. The frame column for the identification of object extraction, the basic coordinate rod end displacement and force for the input and output information, and the default unit and section based on stress constitutive numerical model for frame columns; using unscented Kalman Filter (UKF) pure parameter estimation and double estimation model identification; analysis of UKF pure parameter estimation and noise performance sensitivity to initial value selection, and discusses a model error of two kinds of estimation model. Research on recognition effect Show that the model has a high precision parameter constitutive UKF algorithm in recognition of beam and column section, robustness and computational efficiency. (3) established the finite element model and considering the hybrid test system architecture based on the updated. Analysis of the existing two ring hybrid test system architecture and build a hybrid test system simulation platform study on the architecture of three; hybrid test system based on finite element software, summarizes the MATLAB finite element and the intermediate ring D data communications between SPACE and extended middle layer D SPACE to include command interpolation, boundary control; the unit and consider the online model updating bar structure hybrid test system architecture. The research shows that the simulation platform and the test architecture proposed is feasible and effective. (4) to carry out routine mixture test and hybrid test consider online model updating. The plane steel frame for the research of As to truss structure calculation model and the static and dynamic analysis algorithm; design of full-scale column test structure, studied three actuator loading mode and measurement scheme; carry out frame structure of conventional hybrid test oriented unit and considering the mixed test online update model. The results show that, three the actuator loading mode can realize planar frame column boundary conditions, conventional Substructure Hybrid Test of large frame structure advantage is not obvious, and consider the online hybrid test model updating can greatly improve the test precision.

【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU317.1;TU311.3

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本文編號(hào)：1457776