本文關鍵詞：異形梁橋偏載系數(shù)分析及損傷識別方法研究　出處：《吉林大學》2017年碩士論文　論文類型：學位論文

  更多相關文章： 異形梁橋 數(shù)值仿真 響應曲面法 偏載系數(shù) 損傷識別

【摘要】：隨著我國經(jīng)濟快速增長與城市化進程的不斷推進,城市交通需求不斷增大,給城市交通運輸提出了新的挑戰(zhàn)。為了適應城市交通流的不斷增長及地形空間的局限,異形橋梁作為主線與匝道的連接結構,得到了不斷應用,極大地解決了繁重的城市交通問題。但異形橋梁結構空間受力復雜,現(xiàn)行設計規(guī)范及計算理論對該型橋梁尚未做出詳細規(guī)定,設計理論亟待完善。偏載系數(shù)作為車輛偏載時對橋梁整體受力影響的分析參數(shù),現(xiàn)有偏載系數(shù)分析方法存在局限性,提出適用于異形橋梁的偏載系數(shù)計算方法對提高結構的設計安全性尤為重要。此外,在重載交通作用下,異形橋梁結構極易出現(xiàn)損傷,給人員和車輛的出行帶來安全隱患。因此,完善異形橋梁結構的設計方法,及時、有效識別異形橋梁結構損傷,對保障該型橋梁安全運營具有重要意義。本文依托吉林省交通廳科技項目《異形預應力混凝土橋梁受力特性分析及設計方法研究》,選取分叉型和漸變型兩類典型的異形箱梁橋作為研究對象,通過數(shù)值仿真分析了設計參數(shù)對偏載系數(shù)的影響。針對分叉橋跨在復雜受力條件下的損傷狀態(tài),提出了具有較高準確性的損傷識別方法,具體研究內(nèi)容如下:1、對現(xiàn)有直線橋梁設計理論與偏載系數(shù)計算方法進行了概述,對比分析了各方法的適用條件和優(yōu)缺點。闡述了有限元數(shù)值仿真方法和響應曲面法在異形梁橋偏載系數(shù)計算分析中的適用性,為后續(xù)研究提供了理論依據(jù)。2、針對異形梁橋設計參數(shù)對偏載系數(shù)的影響,基于Box-Behnken響應曲面方法計算分析了偏載系數(shù)與設計變量間的定量影響關系。以跨徑、箱梁截面寬度和高度、匝道半徑、暗橫梁剛度作為響應曲面法輸入值,以偏載系數(shù)為響應輸出值,確定了設計參數(shù)對偏載系數(shù)的影響分析方案。對各參數(shù)組合下的異形梁橋進行數(shù)值仿真,提取控制截面測點的應力、撓度來計算典型異形梁橋的偏載系數(shù),得到了各設計參數(shù)對偏載系數(shù)的影響規(guī)律。通過建立設計變量與偏載系數(shù)之間的多項式函數(shù)關系,為實際工程偏載系數(shù)計算提供參考。3、基于模態(tài)曲率差與模糊推理理論,提出了異形梁橋分叉橋跨的損傷識別方法。將振型數(shù)據(jù)進行二次差分,計算模態(tài)曲率值,通過損傷前后的模態(tài)曲率差進行損傷位置識別。在此基礎上,以損傷位置節(jié)點模態(tài)曲率差為損傷程度識別指標,采用隸屬度函數(shù)對其進行模糊化,構建損傷識別模糊規(guī)則庫,通過測試樣本與模糊規(guī)則庫的模式匹配,實現(xiàn)損傷程度識別。數(shù)值仿真損傷識別結果表明,基于模糊曲率差與模糊推理的損傷識別方法能夠準確識別分叉橋跨的既有損傷,驗證了該方法在異形梁橋損傷識別中的有效性。
[Abstract]:With the rapid growth of China's economy and city development, city traffic demand increases unceasingly, put forward the new challenge to the city transportation. In order to adapt to the growing city traffic and terrain space limitation, special-shaped bridge connecting structure as main line and ramp, has been continuously applied, greatly solve the city the heavy traffic problems. But the special-shaped bridge structure spatial stress is complex, the bridge has not yet made with current design specifications and calculation theory, design theory needs to be improved. Parameter analysis of partial load coefficient as the partial load vehicles on the bridge when the overall stress effect, the existing partial load coefficient analysis method has limitations, calculation method the partial load coefficient is proposed for special-shaped bridge is very important to improve the design of the safety of the structure. In addition, under heavy load, special-shaped bridge structure prone to damage Injury, security risks to personnel and vehicle travel. Therefore, to improve the design method, special-shaped bridge structure and special-shaped bridge structure damage identification effectively, to guarantee the safe operation of the bridge type has important significance. This paper relies on the project "Jilin province transportation hall shaped prestressed concrete bridge force analysis and Design Method Study on the selection of irregular box >, forked and graded two typical girder bridge as the research object, effects of design parameters on partial load coefficient is studied by numerical simulation. The bifurcation bridge in complex stress conditions by injury, the damage identification method has high accuracy, the specific contents are as follows 1, the existing design theory of linear bridge and partial load coefficient calculation method are summarized, compared and analyzed the applicability of the methods and the advantages and disadvantages are expounded. The finite element numerical simulation method And the response surface method in special-shaped bridge eccentric load coefficient calculation applicability analysis, provides a theoretical basis for further research on.2, special-shaped bridge design parameters on the impact of partial load coefficient, Box-Behnken response surface method to analyze the quantitative effects of partial load coefficient and the relationship between the design variables. Based on the calculation to the span, box beam width and height, ramp radius, dark beam stiffness as the response surface method to input value, partial load coefficient of response output value, to determine the influence of design parameters on partial load coefficient analysis method. The parameters of beam bridge under the combination of numerical simulation, extraction and control points of section stress. To calculate the deflection of eccentric load coefficient of typical special-shaped bridge, get the design parameters on the influence of eccentric load coefficient. The polynomial function by establishing a relationship between the design variables and partial load coefficient, eccentric load coefficient for practical engineering Calculation of reference.3, based on the modal curvature difference and fuzzy reasoning theory, put forward the method of damage identification of beam bridge bridge. The bifurcation mode data for the two time difference calculation, modal curvature value, the modal curvature difference before and after damage damage location identification. On this basis, the damage location node mode as the curvature damage identification index, using the membership function of the fuzzy, construction damage identification Fuzzy rule base, through the test sample and the fuzzy rules for pattern matching, to achieve the recognition of the damage degree. The numerical simulation results show that the damage identification, damage identification method of fuzzy curvature and fuzzy reasoning can accurately identify the bifurcation of the bridge is based on the damage, to verify the validity of the method in damage identification of beam bridge.

【學位授予單位】：吉林大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U446

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