【摘要】：水泥混凝土路面通常設置接縫來降低溫度和濕度應力,為了保持路面的整體性,一般在縱縫中設置拉桿,在橫縫中設置傳力桿,現(xiàn)階段我國道路設計使用的拉桿以鋼制拉桿為主。鋼制拉桿不可避免的存在腐蝕等諸多現(xiàn)象影響路面的使用壽命,尤其在使用除冰劑較多的東北地區(qū)。故國內外很多學者致力于研究新型材料代替鋼筋使用于路面結構中,其中玄武巖纖維筋以其優(yōu)良的物理、化學性能得到土木工程界的普遍關注,應用逐漸廣泛。本文研究玄武巖纖維筋代替鋼筋應用于路面拉桿中的適用性。結合實際工程,利用ABAQUS有限元計算軟件建立路面結構的三維模型,分析不同車輛荷載下路面結構的力學響應,確定出最不利荷載位置；在此位置下分析玄武巖纖維筋拉桿的適用性和采用不同長度、間距、直徑情況下路面板以及拉桿的受力情況；綜合考慮溫度荷載的作用以及土基強度因素的影響,確定玄武巖纖維筋的最佳布設方案。系統(tǒng)的分析研究玄武巖纖維筋拉桿的路用性能,以解決鋼筋銹蝕等問題給路面結構帶來的危害。結果表明：不同荷載位置情況下,使用玄武巖纖維筋拉桿的路面板彎沉值以及板底拉應力與鋼筋拉桿相差不大,拉桿剪應力較大,拉應力較小且均在允許范圍內。隨玄武巖纖維筋拉桿直徑增大,路面板的彎沉及最大拉應力、拉桿的應力均減小,溫度荷載下路面的開裂位移以及翹曲高度也減�。浑S拉桿間距的增大,路面板的彎沉及最大拉應力增大,溫度荷載下路面的開裂位移以及翹曲高度增大；隨著拉桿長度的增大,路面結構的力學響應波動不大并在700mm處取得最小值,故只需保證一定的拉桿長度以保證拉桿剪應力不會過于集中。較強路基強度下使用玄武巖纖維筋拉桿的路面結構在車輛荷載作用下的力學響應均小于土基強度較弱下的力學響應,可見施工中保證土基強度能夠增大使用玄武巖纖維筋拉桿路面的使用壽命。
[Abstract]:Cement concrete pavement is usually provided with joints to reduce temperature and humidity stresses. In order to maintain the integrity of the pavement, tension rods are generally set in longitudinal joints and force transfer rods are set in transverse joints. At present, the pull rod used in road design in our country is mainly made of steel pull rod. Corrosion of steel pull rod inevitably affects the service life of pavement, especially in Northeast China, where deicing agent is more used. Therefore, many scholars at home and abroad are committed to the study of new materials instead of steel bars used in pavement structures, in which basalt fiber bars have been widely concerned by the civil engineering field because of their excellent physical and chemical properties, and their applications are gradually widespread. In this paper, the applicability of basalt fiber reinforcement instead of steel bar in pavement pull rod is studied. Combined with practical engineering, the three-dimensional model of pavement structure is established by using ABAQUS finite element calculation software, the mechanical response of pavement structure under different vehicle loads is analyzed, and the most unfavorable load position is determined. In this position, the applicability of basalt fiber bar pull rod and the force of road panel and pull rod under the condition of different length, spacing and diameter are analyzed. Considering the effect of temperature load and the influence of soil foundation strength, the best arrangement scheme of basalt fiber reinforcement is determined. The road performance of basalt fiber bar pull rod is systematically analyzed and studied in order to solve the harm to pavement structure caused by steel bar corrosion and so on. The results show that under different load positions, the deflection value of pavement plate with basalt fiber reinforced pull rod and the tensile stress at the bottom of the plate are not significantly different from those of the steel bar, the shear stress of the pull rod is large, and the tensile stress is small and all within the allowable range. With the increase of the diameter of basalt fiber bar, the deflection and maximum tensile stress of pavement slab, the stress of pull rod and the cracking displacement and warping height of pavement under temperature load also decrease. With the increase of pull rod spacing, the deflection and maximum tensile stress of pavement slab increase, and the cracking displacement and warping height of pavement under temperature load increase. With the increase of the length of the pull rod, the mechanical response of the pavement structure does not fluctuate and the minimum value is obtained at 700mm, so it is only necessary to ensure a certain length of the pull rod to ensure that the shear stress of the pull rod will not be too concentrated. The mechanical response of pavement structure with basalt fiber reinforced pull rod under vehicle load is lower than that under weak soil foundation strength under strong subgrade strength. It can be seen that the strength of soil foundation can increase the service life of basalt fiber reinforced pull rod pavement in construction.
【學位授予單位】：大連海事大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U414

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本文編號：2483804