【摘要】：鋼-混凝土組合梁通過抗剪連接件將鋼梁和混凝土板連成整體共同受力的橫向承重構件,充分發(fā)揮型鋼受拉,混凝土翼板承受壓力的特點。組合梁的破壞一般是由于車荷載的作用下發(fā)生疲勞破壞,其破壞的主要特征是剪力連接件發(fā)生斷裂。剪力連接件是一種把型鋼和混凝土板連接在一起共同受力的關鍵元件,它分為剛性連接件和柔性連接件,其主要形式有栓釘、槽鋼、彎起鋼筋。本文采用一種新型連接件-開孔波折板剪力連接件,它介于剛性和柔性之間。開孔波折板連接的鋼-混凝土組合梁具有承載力高、抗滑移性能強以及整體性能較好的特點。本文以有限元為手段,利用ABAQUS軟件建立有限元模型,用波折板抗剪連接件代替?zhèn)鹘y(tǒng)的栓釘連接件,并引入彈性混凝土,分別考慮不同橡膠摻量、波折板厚度、波折板波高、轉折角度、波折板開孔直徑、穿孔鋼筋直徑對波折板抗剪承載力的影響,并根據其荷載-滑移曲線得出波折板抗剪承載力近似公式。在考慮彈性混凝土-鋼組合梁單位長度抗剪承載力,建立彈性混凝土組合梁模型,結合局部應力法和Goodman曲線,分析不同橡膠摻量、不同波折板參數對組合梁疲勞壽命的影響。主要結論如下:1)隨著橡膠摻量的增加,推出試件中波折板剪力連接件的抗剪承載力下降;隨著波折板高度的增高,波折板抗剪承載力增大;開孔直徑越大,連接件的抗剪承載力越高;穿孔鋼筋直徑越大,波折板受剪承載力越高;隨著波折板厚度的增高,波折板抗剪承載力增大。2)隨著橡膠摻量的增加,彈性混凝土-鋼組合梁靜力承載力下降,橡膠摻量為10%的彈性混凝土-鋼組合梁疲勞壽命最大;隨著波折板厚度的增大,彈性混凝土-鋼組合梁的疲勞壽命提高;隨著波折板轉折角度的增大,彈性混凝土-鋼組合梁疲勞壽命降低。
[Abstract]:Steel-concrete composite beams combine steel beams and concrete slabs to form transverse load-bearing members through shear connectors, which give full play to the characteristics of section steel under tension and concrete slabs under pressure. The failure of composite beam is generally due to fatigue failure under the action of vehicle load, and the main characteristic of failure is the fracture of shear connection. Shear joint is a kind of key element which connects steel and concrete slabs together. It can be divided into rigid connectors and flexible connectors. The main forms of shear connectors are studs channel steel and bent steel bars. In this paper, a new type of connection-the open-hole corrugated plate shear connection is used, which is between rigidity and flexibility. The steel-concrete composite beams connected with open-hole corrugated plates have the characteristics of high bearing capacity, strong sliding resistance and good overall performance. In this paper, the finite element model is established by means of finite element method and ABAQUS software. The shear joint of corrugated plate is used to replace the traditional bolted joint, and elastic concrete is introduced to consider the different rubber content, the thickness of corrugated plate and the wave height of corrugated plate, respectively. The influence of the turning angle, the diameter of the perforated steel bar and the opening diameter of the corrugated plate on the shear capacity of the corrugated plate is discussed. According to the load-slip curve, the approximate formula of the shear bearing capacity of the corrugated plate is obtained. Considering the shear bearing capacity of elastic concrete-steel composite beam per unit length, the model of elastic concrete composite beam is established. Combined with local stress method and Goodman curve, the influence of different rubber content and different corrugated plate parameters on fatigue life of composite beam is analyzed. The main conclusions are as follows: (1) with the increase of rubber content, the shear bearing capacity of the shear connectors of the wave folded plate decreases with the increase of rubber content, the shear capacity of the corrugated plate increases with the height of the corrugated plate, and the diameter of the opening hole increases. The shear capacity of corrugated plate increases with the increase of the thickness of corrugated plate. 2) with the increase of rubber content, the shear capacity of corrugated plate increases with the increase of the thickness of corrugated plate, the larger the diameter of perforated steel bar is, the higher the shear capacity of corrugated plate is. The static bearing capacity of elastic concrete-steel composite beams decreased, and the fatigue life of elastic concrete-steel composite beams with rubber content of 10% was the largest, and the fatigue life of elastic concrete-steel composite beams increased with the increase of corrugated slab thickness. With the increase of the turning angle of corrugated plate, the fatigue life of elastic concrete-steel composite beam decreases.
【學位授予單位】：天津大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU398.9

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