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Experimental Study on the Nantie Bridge by Dynamic and Static Load

Author: LiuChangChun
Tutor: ChenZhiHua；WangHongZhou
School: Tianjin University
Course: Architecture and Civil Engineering
Keywords: Bridge Dynamic Load Static load Test Research
CLC: U446.1
Type: Master's thesis
Year: 2007
Downloads: 122
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Abstract

The bridge is an important part of the railway and highway, and often become technical difficulty or duration node control engineering in the construction, transportation throat. Usually need to bridge the structural characteristics of the various states of the test bridge meets design standards and to ensure safe operation, static and dynamic load carrier experimental. The static and dynamic load set experimentally to provide a reference for the design, to provide the basis for engineering acceptance is an important part of the bridge construction. This article South Tieqiao bridge high 3.0 ~ 6.0m, Length 2881.36m, two-lane bridge, spacing 5.0 ~ 5.3m, foundation pile foundation beams post-tensioned reinforced concrete beams. In the course of construction, design load changed from 140 tons to 220 tons, to ensure safety to avoid waste, not prefabricated beams designed to increase rebar the prefabricated beam reinforcement processing. Reinforcement measures taken due to the project is in the construction process load changes, related technologies and there is no precedent can learn from, so the construction quality can meet the design requirements of the data that needs to be measured to verify. The main topic of this paper is to load load experimental study of the movement of the bridge. This experiment for crack inspection, static load test of the strength test, beam span and pier body deformation as the main project content, Vibration Characters and Bridge test and driving, braking power response and displacement as the main project content dynamic load experiments. Experimental select projects four beams cross and the three piers representative test. In this paper, under the premise of full grasp of the basic information to develop a load test program to introduce static load experiments using the experimental instrument, the strain point and the deflection point layout situation, load loading programs, as well as the termination of the load control conditions. Dynamic loading experiments bridge across the natural vibration characteristics test and driving, braking dynamic response of the experimental program. In this paper, the experimental data collected, calculated experimental load efficiency the beam span deflection and bending moment, positive stress test section, the impact factor, the structure of the natural frequencies, the braking of the pier top displacement data and the experimental results The comparative analysis of theoretical value. This article by the experimental data combined with computational analysis the following conclusions: (1) in the 140-ton loads, beam control cross-section of the concrete compressive and tensile stress midspan deflection were less than the theoretical value, the beam cross structure is flexible working structure The strength and stiffness can meet the design requirements. (2) the bridge of good quality, safe and reliable, take the reinforcement of economic rationality, technology properly. (3) In this study, a similar bridge reinforcement certain reference bridge experimental study has important reference value.

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