玄武岩纤维筋拉杆的应用研究
发布时间：2019-05-23 09:53
【摘要】：水泥混凝土路面通常设置接缝来降低温度和湿度应力,为了保持路面的整体性,一般在纵缝中设置拉杆,在横缝中设置传力杆,现阶段我国道路设计使用的拉杆以钢制拉杆为主。钢制拉杆不可避免的存在腐蚀等诸多现象影响路面的使用寿命,尤其在使用除冰剂较多的东北地区。故国内外很多学者致力于研究新型材料代替钢筋使用于路面结构中,其中玄武岩纤维筋以其优良的物理、化学性能得到土木工程界的普遍关注,应用逐渐广泛。本文研究玄武岩纤维筋代替钢筋应用于路面拉杆中的适用性。结合实际工程,利用ABAQUS有限元计算软件建立路面结构的三维模型,分析不同车辆荷载下路面结构的力学响应,确定出最不利荷载位置；在此位置下分析玄武岩纤维筋拉杆的适用性和采用不同长度、间距、直径情况下路面板以及拉杆的受力情况；综合考虑温度荷载的作用以及土基强度因素的影响,确定玄武岩纤维筋的最佳布设方案。系统的分析研究玄武岩纤维筋拉杆的路用性能,以解决钢筋锈蚀等问题给路面结构带来的危害。结果表明：不同荷载位置情况下,使用玄武岩纤维筋拉杆的路面板弯沉值以及板底拉应力与钢筋拉杆相差不大,拉杆剪应力较大,拉应力较小且均在允许范围内。随玄武岩纤维筋拉杆直径增大,路面板的弯沉及最大拉应力、拉杆的应力均减小,温度荷载下路面的开裂位移以及翘曲高度也减小；随拉杆间距的增大,路面板的弯沉及最大拉应力增大,温度荷载下路面的开裂位移以及翘曲高度增大；随着拉杆长度的增大,路面结构的力学响应波动不大并在700mm处取得最小值,故只需保证一定的拉杆长度以保证拉杆剪应力不会过于集中。较强路基强度下使用玄武岩纤维筋拉杆的路面结构在车辆荷载作用下的力学响应均小于土基强度较弱下的力学响应,可见施工中保证土基强度能够增大使用玄武岩纤维筋拉杆路面的使用寿命。
[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.
【学位授予单位】：大连海事大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414
本文编号：2483804
[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.
【学位授予单位】：大连海事大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414
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