The Structure Improvement And Finite Element Analysis Study Of A Big Central Cable Plane Main Beam Compound Type Cantilever Hanging Basket

With the commencement of the twelfth Five-Year Plan, China's bridge constructions have developed rapidly, at the same time the bridge types have also increased gradually. Under such conditions, Bridge construction equipment requirements become higher and higher. To meet the challenge,designers work hard to innovate boldly, So the new bridge construction devices are emerging constantly. In this paper, the writer carefully do research on the construction of a new type of cantilever casting hanging basket—a big central cable plane main beam compound type cantilever hanging basket.Jinan Jianbang Yellow River Highway Bridge Project is a controlling engineering to implement the urban development strategy across North in Jinan City. The bridge's main beam is a unique cantilever structure; however this unique structure poses a challenge to the design of construction equipments. At these situations the designers innovate boldly and abandon the traditional design of former fulcrum hanging basket design, finally develop this new compound type hanging basket. For this new design, mastering the mechanical properties in detail and validating whether the design is reasonable or not become very important.After the full study of the design and structure and composition of the hanging basket, the writer does the following research:①Analyzing the structural characteristics and boundary conditions of the Hanging Basket and utilizing poles, beams, shells and other elements to discrete the basket, the writer finally establish an effective overall finite element model of hanging basket.②After doing the static analysis the hanging basket model on a variety of operating conditions, the response to different load combinations are obtained. So the writer determines the reasonableness of the overall design, and identifies the positions which need to improve and strengthen.③According to the results of static analysis, the design of the hanging basket is optimized and the structure is improved. Ensuring the overall performance of the hanging basket, the designs significantly reduce the maximum stress, reduce the weight, and increase operational safety. Obvious optimization effects and significant economic benefits are got at the same time.④Do modal analysis of the improved finite element model of the basket to get the dynamic characteristics, such as the natural frequency and mode of vibration, and make preliminary evaluation of the dynamic characteristics. Analyze the natural frequency of the hanging basket which may lead to the resonance.⑤Based on the modal analysis, study the displacement response of hanging basket under the condition of the harmonic excitation in order to get the harmful resonant frequency. This provides the basis for further optimization design and construction safety measures.⑥After the further study of modal analysis and harmonic response of the hanging basket, simulate the transient response of the basket at the condition of the side direction strong wind transient excitation, verify the reliability of the dynamic design of the basket, and propose some potential development direction.The writer studies the static and dynamic properties of the new type Hanging Basket, and puts forward a reasonable improvement method in the paper. These research achievements will provide important guidance for future design and practical application of such basket.