本文選題：波形鋼腹板 + 組合箱梁��； 參考：《蘭州交通大學》2015年碩士論文

【摘要】：將折疊式鋼板作為箱梁的腹板,從而形成一種新的組合截面,即波形鋼腹板PC組合箱梁。這種截面形式能夠極大的減輕橋梁本身結(jié)構(gòu)的重量,是一種輕型化的橋梁新形式。但其自身的結(jié)構(gòu)特點使得其本身有一些固有的缺點。以試驗梁為基礎(chǔ),建立ANSYS空間有限元模型,對波形鋼腹板PC組合箱梁的試驗梁和有限元模型值進行對比;針對波形鋼腹板PC組合箱梁存在的固有缺點提出結(jié)構(gòu)優(yōu)化改進的方法。在這種改進下針對腹板厚度,腹板數(shù)量及腹板位置對箱梁扭轉(zhuǎn)性能的影響和腹板中剪力分布特點進行有限元模型分析。最后給出腹板厚度、數(shù)量和腹板位置對波形鋼腹板抗扭性能的影響,以及改進后截面腹板中應(yīng)力分布特點。主要工作包括以下幾個方面:(1)查閱相關(guān)文獻,了解波形鋼腹板PC組合箱梁的一般構(gòu)造以及目前國內(nèi)外的研究現(xiàn)狀,波形鋼腹板的構(gòu)造特點及相關(guān)理論。(2)總結(jié)波形鋼腹板PC組合箱梁固有的缺點,分析現(xiàn)階段對于這些缺點進行的處理措施,然后提出改進措施:多腹板設(shè)置。(3)由于多腹板設(shè)置是一種較特別的單箱多室形式,所以梳理單箱多室箱梁抗扭計算公式,類比單箱單室波形鋼腹板計算方法將其引用到波形鋼腹板單箱多室截面形式,考察單箱多室波形鋼腹板組合箱梁的抗扭性能。通過理論計算可知:相同截面尺寸時單箱單室比單箱多室形式抗扭性能好;外側(cè)腹板剪切應(yīng)力比內(nèi)側(cè)腹板大,并隨著內(nèi)側(cè)腹板外移其應(yīng)力越來越接近外腹板。(4)根據(jù)試驗梁尺寸,建立有限元模型,和試驗梁試驗數(shù)據(jù)對比,優(yōu)化模型。建立單箱多室波形鋼腹板PC組合箱梁模型,然后考慮畸變和翼緣板的影響,用有限元數(shù)值分析的方法對理論所得結(jié)果進行驗證,結(jié)果和理論計算一致。(5)建立多腹板設(shè)置的波形鋼腹板PC組合箱梁模型,從腹板數(shù)量,一側(cè)腹板間距兩方面考察其對箱梁抗扭性能和腹板剪切應(yīng)力的影響。有限元分析結(jié)果表明:腹板數(shù)量和抗扭性能無關(guān);一側(cè)腹板之間的距離增大能夠增大箱梁抗扭能力;腹板之間距離很近時,扭轉(zhuǎn)作用下,外側(cè)腹板剪切應(yīng)力略大于內(nèi)側(cè)腹板,但整體而言基本相同。多腹板設(shè)置比單箱單室抗扭性能好。(6)對有限元模型進行扭轉(zhuǎn)頻率分析,結(jié)果表明:腹板位置的變化會影響箱梁扭轉(zhuǎn)頻率大小。
[Abstract]:The folded steel plate is used as the web of the box girder to form a new composite section, I. E. the corrugated steel web PC composite box girder. This section can greatly reduce the weight of the bridge itself, and it is a new light bridge form. However, its own structural characteristics make it has some inherent shortcomings. Based on the test beam, the ANSYS spatial finite element model is established, and the experimental beam and the finite element model value of the corrugated steel web PC composite box girder are compared, and the structural optimization improvement method is put forward in view of the inherent shortcomings of the corrugated steel web PC composite box girder. The effects of web thickness, web number and web position on the torsional performance of box girder and the shear distribution characteristics in the web are analyzed by finite element model. Finally, the effects of the thickness, quantity and position of the web on the torsional resistance of the corrugated steel web are given, as well as the stress distribution characteristics of the improved web. The main work includes the following aspects: 1) to consult relevant documents to understand the general structure of PC composite box girder with corrugated steel webs and the current research situation at home and abroad. The structural characteristics and related theory of corrugated steel web. 2) summarize the inherent shortcomings of corrugated steel web PC composite box girder, and analyze the measures to deal with these shortcomings at the present stage. Then the improvement measures are put forward: Multi-web setting. 3) since the multi-web setting is a special single-box multi-chamber form, the torsional calculation formula of single-box multi-chamber box girder is combed. Compared with the calculation method of single box and single chamber corrugated steel web plate, the torsional resistance of single box and multi chamber corrugated steel web composite box girder is investigated by introducing it to the form of multi chamber section of single box steel web plate. The theoretical calculation shows that the torsional resistance of single chamber is better than that of single chamber with the same cross section size, the shear stress of the outer web is larger than that of the inner web, and the stress is closer to the outer web with the inner web moving out. (4) according to the size of the test beam, the shear stress of the outer web is larger than that of the inner web. The finite element model is established and compared with the test data of the test beam, and the model is optimized. The model of PC composite box girder with single box and multi-chamber corrugated steel webs is established, and the effect of distortion and flange plate is considered. The theoretical results are verified by finite element numerical analysis. The results are consistent with the theoretical calculation. (5) the model of PC composite box girder with multi-webs is established. The effects of the number of web plates and the spacing of one side web plate on the torsion resistance and shear stress of the box girder are investigated in terms of the number of web plates and the distance between the web plates. The results of finite element analysis show that the number of web plates has nothing to do with the torsion resistance, the shear stress of the outer web is slightly larger than that of the inner web when the distance between the web plates is very close, and the increase of the distance between the web plates can increase the torsion ability of the box girder. But on the whole, it is basically the same. The torsional frequency of the finite element model is analyzed by the method of multi-web setting which is better than that of single box and single chamber. The results show that the change of web position will affect the torsional frequency of box girder.
【學位授予單位】：蘭州交通大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U448.216

【參考文獻】

相關(guān)期刊論文 前1條

1 李宏江,葉見曙,萬水,王毅;波形鋼腹板箱梁偏載下的力學性能[J];交通運輸工程學報;2004年02期

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本文編號：1823356