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Wide dwarf tower cable-stayed structure parameters analysis and wide box girder shear lag effect

Author: XiongZhi
Tutor: YuXiangDong
School: Central South University
Course: Civil Engineering
Keywords: Extradossed bridges Wide box girder Live load characteristic parameters Shear Lag Local stress Cable Beam live load ratio Stress amplitude
CLC: U448.27
Type: Master's thesis
Year: 2011
Downloads: 66
Quote: 0
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Abstract


Low tower cable-stayed bridge is the last 20 years , the rise of a relatively new form of bridge structures , he both continuous beam ( continuous rigid frame ) bridge and the mechanical characteristics of the traditional cable-stayed bridge , in the 100 ~ 300m span bridge has a good competitive advantage , in recent years the pace of development is very fast and has become a common bridge type . In this paper, Yunnan Suijiang County Quartet bridge engineering background , the research work . (1) summarizes the wide box girder design theory , in particular the development of shear lag effect and a common method for solving . Quartet Bridge boundary conditions and load conditions , derived Quartet bridge cable beam live load ratio is calculated , and the derivation of the formula of the three analogy method for the bridge . ( 2 ) the use of the space beam element model MIDAS / CIVIL software Quartet Bridge Quartet bridge 's main beam as wide box girder Quartet Bridge live load effect , respectively, to explore the high tower , cable cross-sectional area , the main beam inertia moments of low tower cable-stayed bridge live load effect , the effect of the parameters characteristic parameter α to draw on the combined effects of the low tower cable-stayed bridge effect obtained Quartet bridge cable beam live load ratio η , at the same time α and η as a standard definition of the dwarf tower cable-stayed and stayed bridge . Explore extradossed bridges without cable length and high tower reasonable value . ( 3 ) the use of MIDAS / FEA Quartet bridge unit model space entities , shear lag effect of wide the box girder typical cross-section analysis of the effect of the material linear elastic material nonlinearity . Results and material linear elastic three analogy method , the material is linear elastic shear lag coefficient is generally higher than the the three analogy method calculated value is small but is very close to , three incomparable calculated partial conservative. Whether to consider the results of the calculation under the conditions of material nonlinearity contrast , found that the concrete position of the Quartet in the most unfavorable load working conditions under the bridge into the plastic stage . Plastic state sectional stress distribution is more uniform. Finally , the local stress analysis of anchorage zone .

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CLC: > Transportation > Road transport > Bridges and Culverts > All kinds of bridges > Bridge: Structure > Cable-stayed bridge
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