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Mechanical Property Research of Reinforced Concrete Beam Bridges under Automobile Load Spectrum

Author: HuangHua
Tutor: LiuMing
School: Chang'an University
Course: Structural Engineering
Keywords: Vehicle load spectrum Finite Element Dynamic Response Impact factor Fatigue
CLC: U441.3
Type: Master's thesis
Year: 2005
Downloads: 511
Quote: 9
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Abstract

Reinforced concrete bridge growing as the hours of operation of the concrete cracking, corrosion, carrying capacity is decreased. Many operators bridges, including limited cracking strength prestressed concrete bridge cracks in the use phase, and repeated as the vehicle load, the crack continues to expand. From the design, the bridge is the dead load, live load worst case combination of static strength design, while the actual operations of the bridge to withstand repeated daily variety of load vehicles. Repeated throughout the life of the bridge is the vehicle damage accumulation. Bridge structure under repeated loads, fatigue damage or even destruction. Research vehicle load spectrum under the mechanical properties of the reinforced concrete bridge is very necessary. This paper first discusses the establishment of vehicle load spectrum, using the results of previous studies, preparation of vehicle load spectrum simulation program to construct different operational state of the vehicle load spectrum, using the finite element program loaded into the load spectrum simulation proceeds concrete simple T type of beam bridge, partial load bicycle paths, bicycle paths contained, the dynamic response of two lanes in the same direction, two lanes opposite case, the model space, and to study the impact of the speed of impact factor; established T-beams element solid model, under vehicle load spectrum beam fatigue cracking, the nip concrete tension zone reinforcement stress time histories. The analysis shows that: the use of computer simulation of vehicle load spectrum, and loaded into the finite element model, further analysis of the mechanical properties of the bridge is feasible. Speed ??impact factor is a very complex process, vehicles are high-speed and low-speed peaks overall was rising trends; bridges under vehicle load spectrum, while strongly cross beam vibration than the middle cross, transverse The vibration is weak, the flow of traffic on the bridge vibration. T-beam dynamic deflection under the vehicle load spectrum is greater than the design load and checking deflection under load static load, but within the range of deflection in the design specification; fatigue life of up to 2 × 10 6, but not more than 2 × 10 to 7; the nip concrete stress to meet the design of concrete structures GB50010-2002 provisions on fatigue checking, but pull reinforced stress can not meet the requirements of the specification on fatigue checking highway reinforced concrete and prestressed concrete bridge design specifications JTJ023-85 and JTGD62-2004 design bridges and culverts were fatigue strength checking.

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