Tower Cable-Stayed Bridge Static Load Experiment

With the rapid development of China's economy, investment in infrastructure.In recent years, because of the restriction of long-span bridge needs more and more with the topography makes the tower cable stayed bridge has been widely used, but due to quality problems, serious overloading of vehicles, rainstorm and flood of disrepair, daily management and protection is not in place and other reasons has occurred many cable-stayed bridge safety and quality accident.Therefore the technical condition of bridge structure by regular inspection of objective evaluation, and according to the test results and the bridge structure into the action of static load test, found in the inspection to the unqualified parts bearing capacity inspection assessment, timely detection exists in the endanger the safety of the structure of the hidden trouble, to ensure the safety of bridge structure plays a crucial role.For bridge static and dynamic load test is on the bridge structure of a scientific test the direct load test, quality evaluation of bridge the most direct and effective ways and means, especially suitable for cable-stayed bridge.1.Summarize the basic test theory of static and dynamic load test for long-span test bridges such as cable-stayed bridges.2.By using the large finite element software MIDAS/CIVIL, the three-dimensional finite element test real bridge is established, including the section input, boundary conditions of input, the load of the input, respectively, calculated by the bridge The effects and modes of design load and test load are compared.3.By static load test, of the bridge under different load conditions are measured.The mechanical properties of bridge structure under static load are evaluated by comparing with the theoretical calculation.Can meet the design requirements of the bridge.4.The dynamic load test, e a Testtab software on the modal! Sports car! Jump vehicle test data by time-domain, calculated the natural frequencies of the bridge Impact coefficient and damping ratio, analysis of bridge stiffness and bearing capacity meets the requirements.5.Finally, the actual evaluation of the performance of the bridge to provide real-time basis for the maintenance and repair of bridges, in addition to the same type of long-span bridges to provide reference for the detection and maintenance.