The Structural Analysis Of Transport-Erection Integrated Erector

In the recent years, along with the development of technology and our country, high-speed railway construction in China has made great progress. Expected in2020, high-speed railway mileage in China will reach18,000km, in that time the mileage will account for more than half of the global high-speed rail mileage. In our high-speed railway construction, erectors play a pivotal role, to ensure their safe operation and try to reduce costs becomes an important research topic.In the large-scale machinery and architecture structure, the metal structure play the supporting role mainly, so the static strength is undoubtedly the most important, but its dynamic reliability is also very important and need to be paid enough attention to. Throughout the large metal structure of the domestic and foreign design, almost all are taken into account the requirements of the static strength and static stiffness, but the dynamic characteristics of the structure is not paid enough attention to. There is often a big hidden danger. Such as the famous Bridge Tacoma and Bridge Hartman all collapsed after they are built soon, because there are some serious dynamic defects. Erector studied in this paper is widely used in high-speed railway construction, the metal structure is the most important load component, due to its big lifted load, a slight vibration can have a huge impact load, so the dynamic reliability is very important.In addition, with step-by-step upgrade of the iron ore price in recent years, steel price also will improve, which have raised new challenges to the enterprise. The design of erector, to meet the performance requirements under the premise, as far as possible to optimize the structure in order to reduce the use of steel, it will not only reduce cost, improve market competitiveness, but also to maximize protection of the environment.In order to make erector have a reasonable strength and dynamic characteristics, based on the theory of structural dynamics, mechanical vibrations and other related disciplines, the YJ900type erector’s metal structure is analyzed using ANSYS, emphasis on the modal analysis and transient kinetic analysis. Get the five vibration mode and frequency, analyze the modal analysis result and propose some improvements. Through the analysis of dynamic lifted load, the displacement dynamic response curve at the midspan of the erector’s main beam and the maximum stress curve of the erector are all obtained. Through these analysis, an intuitive understanding of displacement and stress changes are obtained, some improvement programs and some reference for future bridge are proposed.The research of the paper have some actual engineering value, the major work include:1) Analysis of erector’s metal structure, to establish a rational finite element model, and calculate the static strength, static stiffness and the local stability of the main beam.2) To do modal analysis and get the five vibration mode and frequency, propose some improvement program in accordance with the result of the analysis.3) Refer to the relevant literature, analyzing the dynamic load coefficient, and establishing the dynamic equation of the lifting process.4) To do transient kinetic analysis, the displacement dynamic response curve at the midspan of the erector’s main beam and the maximum stress curve of the erector are all obtained, providing a reference for the design of the future erectors.