鋼絲損傷對懸索橋吊索承載力影響分析
發(fā)布時間：2018-10-16 14:08
【摘要】：懸索橋具有跨度大、輕柔性、用料省等特點,其能充分利用材料的特性而受到橋梁界的青睞。由于在車輛荷載作用下并加上自然界的腐蝕雙重作用,使得懸索橋鋼絲吊索的安全使用受到了嚴重的威脅�；诖私Y(jié)合大跨度懸索橋?qū)嶋H工程,研究鋼絲吊索損傷情況下對懸索橋吊索結(jié)構(gòu)承載力特性影響分析。運用有限元結(jié)構(gòu)分析軟件Midas/Civil對懸索橋進行實體模型的建立,對懸索橋處于不同車輛荷載工況下懸索橋吊索結(jié)構(gòu)的內(nèi)力變化；其次對工程吊索鋼絲材料進行力學拉伸試驗,試驗分為損傷試驗和無損試驗,其中損傷試驗是對鋼絲進行表面刻槽及電化學腐蝕,電化學腐蝕采用外加直流電源的形式進行,腐蝕的程度是以時間和通電電流大小為參數(shù)進行試驗研究,吊索刻痕深度控制以精度為0.02mm的游標卡尺進行有效控制。研究結(jié)果表明：刻痕深度的變化對鋼絲的受力位移曲線影響主要表現(xiàn)在曲線的彈塑性階段和頸縮破壞階段,而對材料的彈性階段影響較小。荷載作用下刻痕損傷的吊索鋼絲塑性變形隨著刻痕深度的增加逐漸的降低,而與刻痕的位置沒有關系,隨著刻痕深度的增加鋼絲吊索的承載力有一定程度的下降,但對整個吊索結(jié)構(gòu)的影響相對較�。欢g的鋼絲對吊索結(jié)構(gòu)影響較大,腐蝕改變了材料的力學特性,經(jīng)過腐蝕的材料,其塑性變形在一開始受力的時候位移就發(fā)生較大的變化,這種變化往往是不可逆的,而在彈塑性階段和頸縮破壞階段都發(fā)生的很快,即達到一定的荷載就發(fā)生斷裂破壞,這對于受較大沖擊力并需要一定伸長變化的吊索而言顯然腐蝕材料是不能滿足構(gòu)件的需要,特別是腐蝕特別嚴重的構(gòu)件,承載力降低達45%,對構(gòu)件的安全使用構(gòu)成了嚴重的威脅,因此在日常的維修與加固過程中應該重點監(jiān)測吊索鋼絲材料的腐蝕,對腐蝕的材料及早的采取保護或者更換。
[Abstract]:Suspension bridge has the characteristics of large span, soft, and saving materials, and it can make full use of the characteristics of materials, so it is favored by the bridge boundary. Due to the dual action of vehicle load and natural corrosion, the safety of steel wire sling of suspension bridge is seriously threatened. Based on the practical engineering of long-span suspension bridge, the influence of steel wire sling damage on the bearing capacity of suspension bridge structure is studied. The finite element structure analysis software Midas/Civil is used to establish the solid model of suspension bridge, and the internal force of suspension bridge under different vehicle load conditions is changed. Secondly, the mechanical tensile test of steel wire material for engineering sling is carried out. The test is divided into damage test and nondestructive test, in which the damage test is the surface grooving and electrochemical corrosion of the steel wire, and the electrochemical corrosion is carried out in the form of an additional DC power supply. The degree of corrosion is studied with time and current as parameters, and the depth of slings is controlled by Vernier calipers with precision of 0.02mm. The results show that the stress displacement curve of steel wire is mainly affected by the change of indentation depth in the elastic-plastic stage and necking failure stage, but it has little effect on the elastic stage of the material. The plastic deformation of sling steel wire with notch damage under load decreases gradually with the increase of indentation depth, but it has no relation with the location of indentation, and the bearing capacity of sling cable decreases to a certain extent with the increase of indentation depth. However, the influence on the whole sling structure is relatively small, while the corroded steel wire has a great influence on the sling structure, and corrosion changes the mechanical properties of the material, and the corroded material, The plastic deformation changes greatly at the beginning of loading, and this change is often irreversible. However, in the elastic-plastic stage and necking failure stage, the fracture occurs quickly, that is, when a certain load is reached, the fracture failure occurs. It is obvious that the corroded material cannot meet the needs of the members for the slings that are subjected to a large impact force and require certain elongation changes, especially for the particularly serious corroded members, the bearing capacity of which is reduced to 45.5 percent, which poses a serious threat to the safe use of the components. Therefore, in the course of daily maintenance and reinforcement, the corrosion of sling wire material should be monitored, and the corroded material should be protected or replaced as early as possible.
【學位授予單位】：遼寧工程技術大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U441;U448.25
本文編號：2274605
[Abstract]:Suspension bridge has the characteristics of large span, soft, and saving materials, and it can make full use of the characteristics of materials, so it is favored by the bridge boundary. Due to the dual action of vehicle load and natural corrosion, the safety of steel wire sling of suspension bridge is seriously threatened. Based on the practical engineering of long-span suspension bridge, the influence of steel wire sling damage on the bearing capacity of suspension bridge structure is studied. The finite element structure analysis software Midas/Civil is used to establish the solid model of suspension bridge, and the internal force of suspension bridge under different vehicle load conditions is changed. Secondly, the mechanical tensile test of steel wire material for engineering sling is carried out. The test is divided into damage test and nondestructive test, in which the damage test is the surface grooving and electrochemical corrosion of the steel wire, and the electrochemical corrosion is carried out in the form of an additional DC power supply. The degree of corrosion is studied with time and current as parameters, and the depth of slings is controlled by Vernier calipers with precision of 0.02mm. The results show that the stress displacement curve of steel wire is mainly affected by the change of indentation depth in the elastic-plastic stage and necking failure stage, but it has little effect on the elastic stage of the material. The plastic deformation of sling steel wire with notch damage under load decreases gradually with the increase of indentation depth, but it has no relation with the location of indentation, and the bearing capacity of sling cable decreases to a certain extent with the increase of indentation depth. However, the influence on the whole sling structure is relatively small, while the corroded steel wire has a great influence on the sling structure, and corrosion changes the mechanical properties of the material, and the corroded material, The plastic deformation changes greatly at the beginning of loading, and this change is often irreversible. However, in the elastic-plastic stage and necking failure stage, the fracture occurs quickly, that is, when a certain load is reached, the fracture failure occurs. It is obvious that the corroded material cannot meet the needs of the members for the slings that are subjected to a large impact force and require certain elongation changes, especially for the particularly serious corroded members, the bearing capacity of which is reduced to 45.5 percent, which poses a serious threat to the safe use of the components. Therefore, in the course of daily maintenance and reinforcement, the corrosion of sling wire material should be monitored, and the corroded material should be protected or replaced as early as possible.
【學位授予單位】：遼寧工程技術大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U441;U448.25
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