Trial Design And Mechanical Properties Of Ultra-high Performance Concrete Cable-stayed Bridge

Based on the excellent performance of UHPC material,taking the three-span double ca-ble plane concrete cable-stayed bridge-Meixi River Bridge as the background,the main beam material is replaced with UHPC material to draw up a new UHPC cable-stayed bridge,and then based on the finite element calculation The local feasibility analysis of the main beam of the new scheme UHPC cable-stayed bridge was conducted,and then the static and dynamic performance of the original and new scheme structures were analyzed and studied.The spe-cific main work is as follows::(1)According to the relevant literature and specifications,the standard beam length,cross section form and size,the area of each cable and the cable force of the bridge are preli-minarily worked out.(2)The feasibility of the proposed section of UHPC girder was verified by checking the stiffness of the bridge panel,checking the anti-punching bearing capacity,checking the local stability,checking the section shear resistance and checking the local bending resistance.The results show that the prestressing beam at the bottom of the diaphragm plate is required to ensure the local bending resistance of the proposed UHPC beam section.(3)Using large-scale finite element software MIDAS injured two of the original,the new scheme in the constant load,live load,live load,temperature,no wind the live load,and the basic combination under the bearing capacity limit state and serviceability limit state of fre-quency in combination and standard combination has carried on the overall stress analysis of all aspects of the calculation results show that the new scheme resistance performance is good,meet the requirements of specification and use.(4)The self-vibration force characteristics of the original and new schemes are analyzed first,and then the appropriate seismic waves are selected according to the design response spectrum according to the design response spectrum specified by the seismic code and the MIDAS BUILDING wave selection function.The response spectrum calculation analysis and time-history calculation analysis were carried out in the scheme.The calculation results showed that the natural vibration response of the new scheme was similar to the original scheme;the response spectrum and the time-history seismic analysis results did not deviate much.