發(fā)布時間：2018-11-20 07:23

【摘要】：波形鋼腹板組合箱梁以其自重輕、受力明確、預應力效率高、施工周期短等優(yōu)勢，在國內外得到了廣泛的研究和應用。我國對該結構的研究起步較晚，但通過各方的努力，在波形鋼腹板組合梁的抗彎、抗剪、抗扭及動力性能等方面取得一系列的科研成果，在我國展現(xiàn)出蓬勃發(fā)展的態(tài)勢。 以往對波形鋼腹板的抗剪性能研究多集中在剪切屈曲方面，例如剪切屈曲形式、破壞形式、影響因素、剪切屈曲強度計算方法等，對波形鋼腹板組合梁截面抗剪性能研究較少，頂?shù)谆炷�土板、波形鋼腹板三者間剪力分擔比例需要進一步研究，同時對于偏載作用下波形鋼腹板剪應力偏大系數(shù)計算方法并沒有明確，已有的混凝土腹板箱梁偏載增大系數(shù)計算方法是否適用需要進一步的研究。因此，本文以自然科學基金項目“波形鋼腹板組合梁長期性能分析與試驗研究”為依托，進行了波形鋼腹板PC組合梁、波形鋼腹板RPC組合梁和普通混凝土腹板箱梁的靜力加載試驗，結合有限元理論分析，研究對稱和偏心加載作用下的波形鋼腹板剪應力分布、腹板剪力分擔比例及腹板剪應力偏載增大系數(shù)，并選取實橋進行相關計算分析和工程驗證。 研究表明：1）有限元理論分析與試驗結果吻合性較好，波形鋼腹板剪應力沿腹板高度方向分布較均勻；剪應力沿腹板縱向分布受到彎起預應力筋、腹板厚度、橫隔板、頂?shù)装搴穸鹊纫蛩氐挠绊懞椭萍s；波形鋼腹板相鄰直板段和水平段在梁的橫截面上剪應力分布存在一定比例關系，近似為波折角的余弦值；不同的頂?shù)装寤炷�土材料，如C50、RPC，對波形鋼腹板剪應力分布影響較小，分布近似相同。 2）通過有限元分析及試驗驗證，試驗梁波形鋼腹板剪力分擔比例為79%~83%范圍內，平均值為82%，與廣西隆百路2號高架橋、桃花峪跨大堤橋的計算結果平均值近似81%；波形鋼腹板分擔了截面較大比例的剪力，波形鋼腹板按分擔截面全部剪力進行設計，具有一定的安全儲備；不同的加載方式（中載、偏載）和不同頂?shù)装宀牧希ㄆ胀ɑ炷�土、RPC）均對截面腹板剪力分擔比例影響較小，但腹板剪力分擔比例受到腹板厚度、橫隔板、頂?shù)装搴穸鹊纫蛩氐挠绊懞椭萍s。 3）波形鋼腹板剪應力偏載效應明顯。波形鋼腹板剪應力偏載增大系數(shù)不是固定值，與截面形式、箱梁寬度、結構形式以及縱向位置有關。針對本文研究的試驗梁形鋼腹板剪應力偏載增大系數(shù)為1.26~1.30；針對實體工程，廣西隆百路2號橋的波形鋼腹板剪應力偏載增大系數(shù)為1.21~1.42，桃花峪跨大堤橋為1.30~1.40。
[Abstract]:The composite box girder with corrugated steel webs has been widely studied and applied at home and abroad because of its advantages such as light weight, clear force, high prestress efficiency and short construction period. The research on this structure started late in our country, but through the efforts of all parties, a series of scientific research achievements have been obtained in bending, shearing, torsion and dynamic performance of the composite beam with corrugated steel web, showing a vigorous development trend in our country. In the past, the research on shear behavior of corrugated steel web was mainly focused on shear buckling, such as shear buckling form, failure form, influencing factors, calculation method of shear buckling strength, etc. The ratio of shear stress sharing among the top and bottom concrete slabs and corrugated steel webs needs further study, and there is no clear method for calculating the large shear stress coefficient of corrugated steel webs under eccentric loads. It is necessary to further study whether the existing methods for calculating the increasing coefficient of eccentric load of concrete web box girder are applicable. Therefore, based on the natural science foundation project "Long-Term performance Analysis and Experimental study of Waveform Steel Web Composite Beams", the PC composite beams with corrugated steel webs are carried out in this paper. Static loading tests of RPC composite beams with corrugated steel webs and ordinary concrete web box girders are carried out. The shear stress distribution of corrugated steel webs under symmetrical and eccentric loading is studied in combination with finite element theory. The proportion of web shearing force and the increasing coefficient of web shear stress bias load are obtained, and the actual bridge is selected for relevant calculation and engineering verification. The results show that: 1) the theoretical analysis of finite element method is in good agreement with the experimental results, and the shear stress of the corrugated steel web plate distributes uniformly along the height of the web plate; The longitudinal distribution of shear stress along the web is influenced and restricted by the bending prestressed tendons, the thickness of web plates, the thickness of transverse partitions, the thickness of top and bottom plates, and so on. The shear stress distribution of the adjacent straight and horizontal sections of the corrugated steel web is proportional to that of the corrugated angle on the cross section of the beam, which is approximately the cosine value of the corrugated angle. The shear stress distribution of corrugated steel webs with different top and bottom concrete materials, such as C50 RPCs, is similar. 2) through finite element analysis and test verification, the shear sharing ratio of the corrugated steel web plate of the test beam is within 79% and 83%, the average value is 82. The average value is approximately 81% with the calculation results of the No. 2 viaduct of Longbai Road in Guangxi and the great embankment bridge of Taohuayu; The corrugated steel webs share a large proportion of the shear force, and the corrugated steel web plate is designed according to all the shear forces of the section, which has a certain safety reserve. Different loading modes (medium load, partial load) and different top and bottom material (ordinary concrete, RPC) have little influence on the shear sharing ratio of cross-section web plate, but the shear sharing ratio of web plate is affected by the thickness of web plate and transverse partition board. The influence and restriction of the top and bottom plate thickness and other factors. 3) the shear stress bias effect of corrugated steel web is obvious. The increasing coefficient of shear stress bias load of corrugated steel web is not a fixed value, but is related to the form of section, the width of box girder, the form of structure and the longitudinal position. The increasing coefficient of shear stress deviation of the beam web studied in this paper is 1.26 ~ 1.30; For the solid engineering, the increasing coefficient of shear stress bias of the corrugated steel web of No. 2 Longbai Road Bridge in Guangxi is 1.21 ~ 1.42, while that of the Taohuayu Bridge is 1.30 ~ 1.40.
【學位授予單位】：交通部公路科學研究院
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U441

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本文編號：2344233