本文選題：網(wǎng)殼結(jié)構 + 損傷識別�。� 參考：《蘭州理工大學》2013年碩士論文

【摘要】：隨著經(jīng)濟的飛速發(fā)展以及科學技術的不斷進步,以網(wǎng)殼結(jié)構為代表的大跨度空間結(jié)構在國內(nèi)外廣泛應用,然而,隨著這些大型結(jié)構的不斷發(fā)展,其伴隨著的問題也不斷凸顯。這些大型復雜結(jié)構在復雜多變的自然環(huán)境中,承受著各種威脅,導致結(jié)構可能產(chǎn)生各種不同的損傷情況。這些大跨度結(jié)構,如網(wǎng)架、網(wǎng)殼,都關乎著人民的生命和財產(chǎn)安全,及時準確的獲得結(jié)構的損傷狀況、預測結(jié)構剩余壽命、為后續(xù)加固方案提供重要信息等就具有不同尋常的意義和舉足輕重的作用。 本文主要闡述了國內(nèi)外結(jié)構損傷識別的研究背景和研究現(xiàn)狀,以及基于模態(tài)參數(shù)的損傷識別理論,重點研究了基于應變模態(tài)的損傷識別理論,并將應變模態(tài)損傷識別理論運用在網(wǎng)殼結(jié)構中。 網(wǎng)殼結(jié)構是大跨度空間結(jié)構中的一種重要的結(jié)構形式。本文通過試驗模態(tài)分析,對有限元模型進行模態(tài)修正,將固有頻率作為修正參數(shù),使最終修正后的有限元理論模型與試驗模型的固有頻率高度相似,為后續(xù)損傷分析的精確度提供了一定的保障。 對修正后的網(wǎng)殼進行損傷識別分析,利用靜力分析確定損傷工況,討論網(wǎng)殼結(jié)構在前三階的不同損傷工況下的損傷指標—應變模態(tài)差的不同變化規(guī)律,通過大量的分析表明： (1)在單桿損傷情況下,利用損傷指標能夠準確快速的識別出受損桿件,并且通過損傷指標的大小關系,可以容易的判別損傷程度。因此,應變模態(tài)能夠有效識別單桿損傷的損傷狀況。 (2)在多桿損傷的情況下,對桿件的損傷識別需要區(qū)分桿件的類別,對于同類型桿件,可以一次性識別出損傷桿件,而對于不同類型桿件同時損傷時,需要進行兩步識別法,通過同類型桿件損傷指標的比較,對損傷桿件進行有效的識別。分析表明,兩步識別法可以有效識別多桿損傷下的受損桿,并且判別出損傷程度。
[Abstract]:With the rapid development of economy and the progress of science and technology, the long-span space structures represented by latticed shell structures are widely used at home and abroad. However, with the continuous development of these large structures, the accompanying problems are constantly highlighted. These large and complex structures are subjected to various threats in the complex and changeable natural environment, which may lead to a variety of damage conditions. These long-span structures, such as latticed structures and latticed shells, are all related to the safety of people's lives and property, timely and accurately obtaining the damage condition of the structure, and predicting the remaining life of the structure. It is of great significance and importance to provide important information for the subsequent reinforcement scheme. In this paper, the research background and present situation of structural damage identification at home and abroad, the damage identification theory based on modal parameters, and the damage identification theory based on strain mode are introduced. Strain mode damage identification theory is applied to reticulated shell structure. Reticulated shell structure is an important structural form in long span spatial structure. In this paper, the modal of the finite element model is modified by the experimental modal analysis, and the natural frequency is taken as the correction parameter, so that the modified finite element theory model is highly similar to the test model. It provides a guarantee for the accuracy of subsequent damage analysis. The damage identification analysis of the modified reticulated shell is carried out, the damage condition is determined by static analysis, and the different variation law of the damage index-strain modal difference of the reticulated shell structure under the first three different damage conditions is discussed. Through a lot of analysis, it is shown that: 1) in the case of single rod damage, the damage index can be used to identify the damaged member accurately and quickly, and the damage degree can be easily judged by the relationship between the damage index and the damage index. Therefore, the strain mode can effectively identify the damage condition of single rod damage. (2) in the case of multi-rod damage, the damage identification of the member needs to distinguish the type of the member. For the same type of member, the damaged member can be identified at one time, but for the different type of member at the same time, the two-step identification method is needed. The damage index of the same type of member is compared to identify the damaged member effectively. The analysis shows that the two-step identification method can effectively identify the damaged rod under multi-bar damage and identify the damage degree.
【學位授予單位】：蘭州理工大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU33;TU317

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