Study On Mechanical Property Of The Buried UHPC Arch-Bride Made Of Corrugated Plates

Currently, medium and small span arch-bridges, which are mainly reinforced concrete arch bridges or masonry arch-bridges, are extensively used in road transportation. With the time passing by, defects occur to this kind of structure to varing degrees. Therefore, the weaknesses of traditional spandrel-filled arch-bridges come to the surface gradually such as complex construction and long construction period etc. Worse still, bridge defects like the crack of concrete and the subsidence of the base often occur after bridges are put in operation. This phenomenon is even more obvious in areas with poor geological conditions and relatively large temperature gap, which affects the normal use of bridges and the safety of transportation. So it is a significant task for bridge engineers to look for a kind of structure which can be simply constructed, with high bearing capacity and high durability. The buried UHPC arch- bridges put forward in this thesis apply UHPC to spandrel-filled arch- bridges. This kind of structure possesses the following advantages:(1) with high intensity and light weight;(2) adopting prefabrication and assembly construction which ensures fast construction;(3) strong adaptability to the subsidence of the base and changes in temperature.The main contents of the thesis are as follows:(1) To design buried UHPC arch-bride made of corrugated plates, to determine the span, the rise-span ratio, the thickness of plates, the height of the filling and other specifications, and to make full use of the superior performance of UHPC to reduce the size of the cross section and the weight of the arch ring;(2) To analyze the conditions of the deformation of the s tructure caused by forces in the construction stage and the finishing stage through employing ANSYS to the numerical calculation of the structure, and employing simulation calculation to asymmetric filling. As the result shows, buried UHPC arch bride made of corrugated plates can resist forces in the construction stage and the finishing stage. It is advisable to enhance monitoring and control of the structure in order to avoid unfavorable effects of asymmetric filling;(3) To analyze mechanical properties of b uried UHPC arch-bride made of corrugated plates such as its basic deflection, changes in overall temperature and elastic stability, and explore the influences of the twist section on the stability of the structure. Meanwhile, to conduct comparison and anal ysis concerning the soil-arch combined effect. As the result shows, the adaptability of this structure to the subsidence of the base and changes in temperature has improved obviously compared with traditional spandrel-filled arch-bridges. The using of twist section can increase the stability of the structure effectively. Through the analysis of the soil-arch effect, the forces on the structure are relatively even and deformation has lessened due to confining pressure of the soil and the distribution of the load;(4) To apply parameter analysis to the structure and to further put forward the design of open-spandrel UHPC. To reduce the weight of the filling, increase the capacity to span of the structure, and to discuss its feasibility.