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Study and Analysis on the Index Bearing Capacity Evaluation of the Small and Medium Span Concrete Bridge

Author: MaXinYong
Tutor: ZhangJingZhen
School: Chang'an University
Course: Bridge and Tunnel Engineering
Keywords: Bridge carrying capacity Calibration coefficient Grillage method Shear Lag Effect Shell element
CLC: U441.2
Type: Master's thesis
Year: 2009
Downloads: 209
Quote: 1
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Abstract


In recent years, with the rapid transport undertakings in China, the rapid development of transportation deadweight constantly increasing, how to take full advantage of the safety reserves of the existing roads and bridges, making continued safe road transport services must be available on the bridge carrying the ability to make a more accurate assessment. Bridge Load Test is one of the most effective means of the most direct and most convincing evaluation of bridge bearing capacity, the security of its supporting theoretical analysis and calculation can provide a more accurate assessment of the bridge in the normal operating state reserves. Calibration coefficients are used as indicators of the evaluation of the bridge carrying capacity should be more stringent definition and a more accurate calculation method. Our existing reference data for ordinary reinforced concrete and pre-stressed concrete bridge structure calibration coefficient of the load test under evaluation, only give a rough range, did not delineate the scope of bridge structure classification. In this paper, see on the basis of a large number of professional books and academic papers, to the Xianyang segment, \Shangzhou highway B2-B6 tenders a large number of bridge load tests rely on common types of bridge type structure calibration coefficient analyzes specific work and research results are as follows: (1) summarizes summarizes the impact of the bridge structure checksum coefficient Calculate the value of the factor. And rely on itself to participate in 51 types of common bridge type load test, analysis of common types of new bridges calibration coefficient distribution range, rich of information on the existing bridge carrying capacity evaluation index calibration coefficient range reserve . (2) by means of finite element analysis software MIDAS, to explore all kinds of common bridge type reasonable simplification in the calculation method. Fabricated Hollow Slab continuous prestressed simply supported span of 16 meters, 20 meters, 20 meters, 25 meters, 30 meters, 40 meters span prestressed assembled four separate box room small box girder bridge, in the Order of the -reinforced concrete arch bridge the grillage method simplifies the calculation of the structure can be made more accurate calibration coefficient. (3) Single Cell Box (double room), thin-walled cast-in-place concrete box girder bridge, is bound to bring a certain error due to the presence of shear lag effect, single girder calculated plane section assumption, and the use to The theory of shell element model can accurately calculate the structure of the parity coefficient, to provide a reference for bridge inspection workers on-site monitoring test data.

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CLC: > Transportation > Road transport > Bridges and Culverts > Structural principles, structural mechanics > Bridge load
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