本文選題：SNS柔性防護系統(tǒng) + 普通鋼柱　； 參考：《重慶交通大學》2014年碩士論文

【摘要】：近幾年來,一種全新的SNS柔性防護技術在國內水電站、礦山、鐵路、公路等各種工程現(xiàn)場的崩塌落石防護中得到了越來越多的認可和應用。國內外至今，在邊坡災害事件中，頻繁不斷發(fā)生下列現(xiàn)象，即被動柔性防護系統(tǒng)在較大巖石沖擊下，或較大量的塌方襲擊鋼繩網時，鋼柱承受著巨大的外力而發(fā)生扭曲和彎曲變形，被動柔性系統(tǒng)有效高度大大降低，嚴重削弱了被動安全防護系統(tǒng)的防護能力。為此，必須更換鋼柱，于是必然產生繁重的系統(tǒng)修復作業(yè)和較大費用的再開支。這種致命弱點的暴露，引起了各方面的關注。 本文針對在邊坡災害事件中，公路邊坡柔性防護系統(tǒng)中普通鋼柱的變形破壞的特點，總結出鋼柱變形的共同特征和原因，在此基礎上，，提出了新的鋼柱截面形式，即截面為中空方形與中空圓形的鋼柱，在參考大量論文的前提下，通過ANSYS有限元分析的方法對三種鋼柱進行了受力的對比分析，并進行了計算的驗證。為了更好的對比分析出三種鋼柱的性能差異，本文首先對三種鋼柱進行了兩種受彎模式下的性能對比分析；其次對三種鋼柱進行了受扭性能的分析;最后針對鋼柱的破壞模式，又進行了屈曲性能的對比分析。為了進行驗證，每一種分析的后面還配有手算的過程。兩種受彎模式的數(shù)據(jù)分析均表明，在相同的材料和外力作用下，普通鋼柱的最大位移以及最大應力都要比中空方形與中空圓形鋼柱的位移大得多；在自由扭轉的情況下，普通鋼柱截面的最大剪應力也要比中空方形鋼柱與中空圓形鋼柱大很多；另外，中空方形鋼柱與中空圓形鋼柱的第一屈曲模態(tài)的臨界荷載則要比普通的工字鋼的要大�？傊�，在相同的用料的情況下，中空方形鋼柱與中空圓形鋼柱在抗扭與抗彎曲的性能上比普通鋼柱強，在抗屈曲性能上也要比普通鋼柱好。以上得出的結論是建立在特定的受力模式情況下得出來的，由于問題的復雜性和其它原因，一些問題還有待深入研究。 由于實體建模的復雜性和鋼柱在SNS柔性防護系統(tǒng)中主要起支撐作用的事實，本文缺少對鋼柱動力抗撞擊性能的研究，重點對鋼柱的力學性能進行了較為全面的分析，以及對鋼柱進行了屈曲性能的分析。
[Abstract]:In recent years, a new SNS flexible protection technology has been more and more recognized and applied in domestic hydropower stations, mines, railways, highways and other projects in the field of rockfall protection. Up to now, the following phenomena occur frequently in slope disaster events at home and abroad, that is, passive flexible protection system under the impact of larger rock, or when a large number of landslides attack the steel rope network, The steel column is subjected to huge external force and is distorted and bent. The effective height of the passive flexible system is greatly reduced which seriously weakens the protection ability of the passive safety protection system. Therefore, the steel column must be replaced, which will inevitably result in heavy system repair operations and costly repayments. The exposure to this fatal weakness has attracted attention from all quarters. In view of the characteristics of deformation and failure of common steel columns in highway slope flexible protection system during slope disasters, the common characteristics and causes of steel column deformation are summarized in this paper. On this basis, a new steel column section form is proposed. The steel column with hollow square section and hollow circular section is compared and analyzed by ANSYS finite element analysis under the premise of referring to a large number of papers, and the calculation results are verified. In order to compare and analyze the performance difference of three kinds of steel columns better, this paper makes a comparative analysis of the performance of three kinds of steel columns under two bending modes; secondly, the torsional properties of three kinds of steel columns are analyzed; finally, aiming at the failure modes of steel columns, A comparative analysis of the buckling performance is also carried out. For verification, each analysis is followed by a manual process. The data analysis of the two bending modes shows that the maximum displacement and maximum stress of the ordinary steel column under the same material and external force are much larger than those of the hollow square and hollow circular steel columns, and in the case of free torsion, the maximum displacement and the maximum stress of the ordinary steel column are much larger than those of the hollow square and hollow circular steel columns. The maximum shear stress of common steel column section is much larger than that of hollow square steel column and hollow circular steel column, and the critical load of the first buckling mode of hollow square steel column and hollow circular steel column is larger than that of common I-steel column. In a word, the torsion and bending resistance of hollow square steel column and hollow circular steel column are better than that of ordinary steel column, and the buckling resistance of hollow square steel column is better than that of ordinary steel column. The above conclusions are based on the specific stress mode. Due to the complexity of the problem and other reasons, some problems need to be studied deeply. Due to the complexity of solid modeling and the fact that steel columns play a major supporting role in SNS flexible protection system, the dynamic impact resistance of steel columns is not studied in this paper, and the mechanical properties of steel columns are analyzed comprehensively. The buckling behavior of steel column is also analyzed.
【學位授予單位】：重慶交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U417.1

【參考文獻】

相關期刊論文 前2條

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本文編號：1806671