天津市某組合鋼橋結構的有限元分析.pdf

1、沈陽建筑大學碩士學位論文天津市某組合鋼橋結構的有限元分析姓名：王剛申請學位級別：碩士專業(yè)：工程力學指導教師：劉鐵林2010-01碩士研究生學位論文 目錄 V Abstract With the development of traffic and the advancement of technology, bridge

2、 construction of our country has been advanced rapidly. Long-span bridges, especially steel bridges, have been used widely in our country. Meanwhile bridge detection becomes more and more important. It is highly signific

3、ant in the applications as follows：assessing actual carrying capacity of bridges, accumulating bridge technical information, and promoting assessing theories of old bridges and design theories of new bridges。 Analyses ar

4、e needed in the detection of combined steel bridges. Correct model of the combined steel bridges and finite element method analyses are the basis of loading test the performance evaluation of bridge. A combined steel bri

5、dge in Tianjin is analyzed in this paper. The static loading test, dynamic characteristics of the bridge and overload with suspender damage analyses are studied. The main researches are as follows: Mechanical model of co

6、mbined steel bridge is established and static analysis is performed. Bending moment of the top-plate above the middle ventral shield, stresses of longitudinal beams and suspenders are obtained. Positions of larger bendin

7、g moment and stress are determined. By researches of influence line, loading positions of static load testing were determined at the mid-span of the main span, 3/8 main-span, 1/8 main-span and at the mid-span of the side

8、 span. Static load testing of combined steel bridge is calculated by finite element analysis software. Equivalent stress and displacement, suspenders stress, longitudinal beam displacement of the rigid frame meet the cod

9、e for design on steel structure of railway bridge. When suspenders damage happens at the 3/8 and 1/2 length of the span, suspenders will be more dangerous than individual suspender damage. Combined steel bridge with over

10、loading car is safe when suspenders are well. Combined steel bridge with overloading car is dangerous when suspenders damage at the 1/2 and 3/8 length of span occurred. The dynamic characteristics of combined steel bridg

11、e are investigated. Model Shape and frequencies of six steps are calculated by finite element method. The basic vibration modes include torsion vibrations and vertical vibration of flat steel box girder and steel frame.

12、Frequency of six steps ranges from 1.471Hz to 4.392Hz. If suspender damage occurs at the 1/2 and 3/8 length of the span, frequency values of six steps of the bridge are almost unchanged. Keywords: Combined Steel Bridge;