【摘要】：本文以星海灣跨海大橋?yàn)楣こ瘫尘?研究吊桿與主桁架連接結(jié)構(gòu)-錨箱的疲勞性能。對(duì)錨箱進(jìn)行足尺模型疲勞試驗(yàn),經(jīng)過(guò)200萬(wàn)次的循環(huán)加載后,錨箱的應(yīng)力狀態(tài)穩(wěn)定,結(jié)構(gòu)疲勞性能滿(mǎn)足設(shè)計(jì)要求。采用有限元軟件進(jìn)行疲勞分析,采用VonMises等效應(yīng)力作為多軸不規(guī)律應(yīng)力轉(zhuǎn)化為簡(jiǎn)單單軸應(yīng)力的應(yīng)力值；為了能夠更好地模擬拉壓狀態(tài),應(yīng)力比采用R=-1；為了能夠準(zhǔn)確的描述延性材料的疲勞特性,平均應(yīng)力修正理論采用Gerber理論。實(shí)驗(yàn)結(jié)果表明,應(yīng)力測(cè)試值均與理論值相近且均小于理論值,且實(shí)驗(yàn)過(guò)程中錨箱的應(yīng)力值很小,結(jié)構(gòu)處于線彈性變形階段,結(jié)構(gòu)體系設(shè)計(jì)安全可靠。焊縫的疲勞性能,由于受施工工藝等的影響,采用考慮施工工藝的Sr—N曲線進(jìn)行處理；結(jié)果表明此種方法能夠很好地考慮制作工藝這一影響。采用雨流計(jì)數(shù)法統(tǒng)計(jì)疲勞應(yīng)力循環(huán)次數(shù),采用Palmgren-Mine線性損傷理論計(jì)算疲勞損傷。采用雙軸受力指示系數(shù)(Biaxiality Indication)對(duì)構(gòu)件在任意時(shí)程荷載作用下的受力狀態(tài)進(jìn)行定性判斷,當(dāng)系數(shù)值為0時(shí)表明結(jié)構(gòu)處于單軸受力狀體,當(dāng)為-1時(shí)為純剪狀態(tài),當(dāng)為1時(shí)為單純的雙軸狀態(tài)。分析表明錨箱焊縫從邊緣向內(nèi)部由純剪狀態(tài)逐步過(guò)渡為雙軸受力狀態(tài)。通過(guò)對(duì)結(jié)構(gòu)整體受力狀態(tài)定性后,能夠指導(dǎo)今后的設(shè)計(jì)重點(diǎn),可為今后錨箱設(shè)計(jì)提供參考。
[Abstract]:In this paper, the fatigue behavior of anchor box, which is the connection structure of suspender and main truss, is studied based on the sea crossing bridge of Xinghai Bay. After 2 million cycles of cyclic loading, the stress state of the anchor box is stable and the fatigue property of the structure can meet the design requirements. Fatigue analysis is carried out by finite element software, VonMises equivalent stress is used as the stress value of multiaxial irregular stress to simple uniaxial stress, in order to simulate the tension and compression state better, the stress ratio is RP-1. In order to accurately describe the fatigue characteristics of ductile materials, Gerber theory is adopted in the mean stress correction theory. The experimental results show that the measured stress values are close to the theoretical values and are smaller than the theoretical values, and the stress values of the anchor box are very small in the experimental process, the structure is in the stage of linear elastic deformation, and the structural system design is safe and reliable. The fatigue properties of weld are treated by Sr-N curve considering construction technology due to the influence of construction technology, and the results show that this method can take this effect into account. The number of fatigue stress cycles is counted by rain flow counting method and the fatigue damage is calculated by Palmgren-Mine linear damage theory. The biaxial force indication coefficient (Biaxiality Indication) is used to qualitatively judge the stress state of the member under arbitrary time-history load. When the coefficient value is 0, it indicates that the structure is in a uniaxial force form, and when -1 is a pure shear state. When 1 is a simple biaxial state. The analysis shows that the weld of the anchor box is gradually transferred from the pure shear state to the biaxial stress state from the edge to the interior. Through the qualitative analysis of the stress state of the whole structure, it can guide the design emphasis in the future and provide reference for the design of the anchor box in the future.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：U441.4

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本文編號(hào)：2412225