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Bridge structure design method of analysis based on the dynamic characteristics

Author: ZhangQiWei
Tutor: WangDongZuo
School: Zhengzhou University
Course: Engineering Mechanics
Keywords: Dynamic characteristics Concept design Constitution design Optimization design Corrugated steel web Combined box girder
CLC: U442.5
Type: Master's thesis
Year: 2007
Downloads: 204
Quote: 3
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Abstract


People ask for better and better environment to live and to work in with the development of our social economy and civilization. In this progress, people refresh their understanding towards the subjects that have been neglected in the specifications of engineering design. The engineering structure dynamic characteristic parameters are one significant part of these subjects that affect the safety, the availability, the efficiency and living comfort of the structure directly.Being connatural parameters of the engineering structures, the self-frequency and the vibrant modes reflect the distributive characteristics of the mass and the stiffness wholly and partly. Comparing with those static parameters such as the internal force and the stress that just reflect the mechanical characteristics of one section or point of the structure. So dynamic parameters like the self-frequency and the vibrant mode are beneficial both to the concept design and the constitution design since they provide us the information of the distributive characteristics of the mass and the stiffness of both the whole body and the parts of the structure much better. On the other side, the concept design and the constitution design in practice are mainly dependent on the engineers’ experiences while the design progress has satisfied the required by the specifications for designing.For these reasons, in this thesis, the author does researches on the designing methods about the concept design and the constitution design based on the analyzing on the dynamic parameters of the engineering structures under the fund of Researching on the theories of structure designing based on the spectrum (EESR200704), the Open Fund Project on Security and Disaster Mitigation of Urban and Engineering Key Lab of Ministry of Education and the Key Lab in Beijing. The main work is as below:1) The driving and the environmental frequencies of the bridges are collected and studied. The dynamic characteristics of the Simple-Supported-Beam Bridge are researched. And then, it is suggested the concept design method on the section shape of the beams and the constitution design method on the sectional sizes of the beams.2) The advantages of the box girder with corrugated steel webs comparing with the box girder with the reinforced concrete webs and the flat steel webs are researched as the concept design, and the optimization design towards the thickness, the obliquity of the webs and the numbers of the inner diaphragms of the box girder with corrugated steel webs are researched as the constitution design by investigating the dynamic characteristics of this new style bridge.3) The optimal analyses are done on the shape of the girder section, the numbers of inner diaphragms and the curves of the box girder of the Yellow River main bridge in JuanCheng that is the longest and most spans bridge with the corrugated steel webs in China, and the research results have been used in the real design.

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CLC: > Transportation > Road transport > Bridges and Culverts > Investigation, design and calculation > Bridge Design
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