本文選題：Visual　切入點：LISP　出處：《蘇州科技大學》2017年碩士論文

【摘要】：“十二五”經(jīng)濟快速發(fā)展,車輛荷載等級不斷提高、車輛數(shù)量不斷增加,“十三五”期間,交通設施安全與規(guī)模要求越來越高,致使新建橋梁寬度越來越寬,與此同時,不可避免的橋梁病害數(shù)量日益增多。箱梁因具有良好的力學性能,如抗彎、抗扭等,所以被廣泛應用于橋梁建設中在國際橋梁建設中,因此箱梁精細化研究分析就顯得很有必要。以往橋梁設計計算受限于電算發(fā)展限制,多以平面桿系理論進行結(jié)構(gòu)計算,其分析計算結(jié)果精度相對于現(xiàn)在的“扁平梁”過于粗糙。在實際工程中,結(jié)構(gòu)采用桿系計算通過規(guī)范要求,但結(jié)構(gòu)后期運營中還是不可避免的出現(xiàn)病害,無形之中就偏離了設計人員的目的。為彌補平面桿系計算結(jié)果固有缺陷,現(xiàn)以精細化分析的思想,通過采用連續(xù)梁精細化建模方法,細致分析其結(jié)構(gòu)空間受力狀態(tài),并同時對比平面桿系模型,研究兩者差異所在,為以后對箱梁進一步研究分析提供一定的指導意義,并從精細化分析角度針對可能存在的病害給出合理加固方案。本文主要研究成果及結(jié)論如下所示:論文總結(jié)了國內(nèi)外箱梁橋在橋梁事業(yè)中發(fā)展現(xiàn)狀及趨勢,整理了目前常見典型橋梁病害案例,對國內(nèi)外研究成果、現(xiàn)狀以及目前存在不足之處進行綜述。并且,簡單介紹了箱梁橋常見的病害癥狀及其原因。詳細地對平面桿系計算模型的計算原理及適用條件、優(yōu)缺點進行論述,簡單介紹了梁格、網(wǎng)格模型計算方法,最后著重總結(jié)了有限元模型計算方法的優(yōu)越性、原理以及注意事項。整理LISP語言語法、發(fā)展來源,主要重點運用Visual LISP以三跨連續(xù)梁為例編寫mct建模程序,實現(xiàn)程序輔助自動化建模,克服了鋼束信息輸入、節(jié)點單元等繁雜問題,為箱梁建模提供快速解決方案。著重以等截面三跨連續(xù)梁為例,建立平面桿系模型與FEA精細化模型,分別選取中墩墩頂頂板位置、中跨跨中底板、邊跨0~1/4L區(qū)域分析其應力狀況,通過兩種模型分析對比規(guī)范主要關(guān)注的頂?shù)装濉懊嫱庹龖Α�、腹板“面�?nèi)主應力”指標的不同。從精細化分析角度提出理論上對于頂板及底板“面內(nèi)主應力”同樣需要進行控制驗算,若不驗算會導致頂?shù)装宄霈F(xiàn)斜裂縫病害。再次,對于平面桿系計算結(jié)果與現(xiàn)行“扁平梁”結(jié)構(gòu)實際應力情況誤差較大,建議設計過程中不僅需要桿系結(jié)構(gòu)計算,而且最好要空間塊體單元同時復核較為穩(wěn)妥。最后針對各種不同位置出現(xiàn)的病害給出常見加固技術(shù)方案。
[Abstract]:With the rapid economic development of the 12th Five-Year Plan, the vehicle load grade is constantly increasing and the number of vehicles is increasing. During the 13th Five-Year Plan period, the requirements for the safety and scale of traffic facilities are becoming more and more high, resulting in the width of new bridges becoming wider and wider, while at the same time, Because of its good mechanical properties, such as bending resistance and torsion resistance, box girder is widely used in bridge construction in international bridge construction. Therefore, it is necessary to study and analyze the box girder in detail. In the past, the design and calculation of bridges was limited by the development of computer calculation, and the structural calculation was mostly carried out by the theory of plane bar system. Compared with the present "flat beam", the accuracy of the analysis and calculation results is too rough. In the actual engineering, the structure adopts the bar system calculation to pass the specification requirements, but in the late operation of the structure, there are inevitable diseases. In order to make up for the inherent defects of the calculation results of the plane bar system, in order to make up for the inherent defects of the calculation results of the plane bar system, the detailed modeling method of continuous beam is adopted to analyze the spatial stress state of the structure in detail. At the same time, compared with the plane bar system model, the difference between the two is studied, which provides some guidance for further research and analysis of box girder in the future. In this paper, the main research results and conclusions are as follows: the paper summarizes the current situation and trend of the development of box girder bridges at home and abroad. In this paper, the common typical bridge disease cases are summarized, and the research results, current situation and shortcomings are summarized. This paper briefly introduces the common disease symptoms and causes of box girder bridge, discusses in detail the calculation principle, applicable conditions, advantages and disadvantages of the plane bar system calculation model, and briefly introduces the calculation methods of the beam lattice and grid model. In the end, the superiority, principle and matters needing attention of the finite element model calculation method are summarized emphatically. The grammar and development source of LISP language are arranged. The main emphasis is to use Visual LISP to compile the mct modeling program by taking three-span continuous beam as an example. Program aided automatic modeling is realized, which overcomes the complicated problems such as input of steel beam information and node element, and provides a fast solution for box girder modeling. Taking the three-span continuous beam with equal cross-section as an example, the plane bar system model and the FEA fine model are established. The position of top plate of middle pier, the middle span of middle span and the bottom plate of middle span are selected respectively, and the stress state of the middle span is analyzed in the area of 0 / 1 / 4L. Through the analysis of two models, the difference of "out-of-plane normal stress" and "in-plane principal stress" of the top and bottom plate, which are mainly concerned by the code, is compared. From the angle of fine analysis, the same "in-plane principal stress" of the roof and the floor is proposed theoretically. The sample needs to be controlled and checked. If the calculation is not checked, the inclined crack will occur on the top and bottom slab. Thirdly, it is suggested that the calculation of the plane bar system should not only require the calculation of the bar structure in the design process, but also that the calculation result of the plane bar system and the actual stress situation of the current "flat beam" structure are quite large. And it is better to check the space block unit at the same time. Finally, the common reinforcement technical scheme is given for various diseases in different positions.
【學位授予單位】：蘇州科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U448.213

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