【摘要】：目前,結(jié)構(gòu)動力損傷識別理論多集中在橋梁上部結(jié)構(gòu)上,針對下部結(jié)構(gòu)橋墩和基礎(chǔ)的研究較少。本文在既有研究的基礎(chǔ)上,提出了一種利用動力響應(yīng)靈敏度分析的鐵路橋墩墩身和基礎(chǔ)狀態(tài)評估方法。本文的主要工作內(nèi)容和成果如下： (1)對各種結(jié)構(gòu)損傷識別方法的研究現(xiàn)狀進(jìn)行了簡單介紹,比較了各種方法的優(yōu)缺點,總結(jié)了現(xiàn)有損傷識別方法研究難點和發(fā)展方向。 (2)詳細(xì)論述了基于靈敏度分析的模型修正方法,闡述了基于靈敏度分析的損傷識別理論和靈敏度方程的求解方法。 (3)建立了考慮梁質(zhì)量和基礎(chǔ)約束的橋墩有限元模型,對橋墩墩身剛度下降和提高兩種工況進(jìn)行了分析。結(jié)果表明,基于動力響應(yīng)靈敏度分析的損傷評估方法對橋墩狀態(tài)變化的位置及程度均能夠進(jìn)行準(zhǔn)確的識別。 (4)選取了不同的激勵位置和響應(yīng)點位置,對結(jié)構(gòu)進(jìn)行了損傷識別,分析總結(jié)了激勵位置和響應(yīng)點位置對識別結(jié)果的影響,給出了較為合理的測點布置建議。 (5)用所提方法對橋梁基礎(chǔ)的病害和加固狀況進(jìn)行了評估。評估結(jié)果和設(shè)定狀態(tài)變化吻合,從而證明了基于動力響應(yīng)靈敏度的評估方法也適用于橋梁基礎(chǔ)狀態(tài)評估。
[Abstract]:At present, the theory of structural dynamic damage identification is mostly focused on the superstructure of the bridge, and the research on the pier and foundation of the substructure is less. Based on the existing research, this paper presents a method for evaluating the piers and foundation states of railway piers by using the sensitivity analysis of dynamic response. The main contents and achievements of this paper are as follows: (1) the research status of various structural damage identification methods is briefly introduced, and the advantages and disadvantages of these methods are compared. The research difficulties and development directions of existing damage identification methods are summarized. (2) the model modification method based on sensitivity analysis is discussed in detail. The damage identification theory based on sensitivity analysis and the solution method of sensitivity equation are expounded. (3) the finite element model of bridge pier considering beam mass and foundation constraints is established. The reduction of pier stiffness and the improvement of pier stiffness are analyzed. The results show that the damage assessment method based on dynamic response sensitivity analysis can accurately identify the location and degree of pier state change. (4) different excitation positions and response point positions are selected. The damage identification of the structure is carried out, and the influence of the excitation position and the response point position on the identification result is analyzed and summarized. The reasonable arrangement of measuring points is given. (5) the disease and reinforcement condition of bridge foundation are evaluated by the proposed method. The evaluation results are consistent with the change of the set state, which proves that the method based on the sensitivity of dynamic response is also suitable for the evaluation of bridge foundation state.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U443.22;U446

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本文編號：2146250