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| Discussion on a New Measurement Way for Bridge Deflection |
| BIAN Yu-sheng |
| Beijing Railway Administration, Beijing 100860, China |
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Abstract Research purposes： The bridge structured deflection is the integrated reflection of the bridge body's active condition and the significant index of the structure bearing capacity. Especially after the implements of the speed - increase and the heavy haul by China railway, the change law of the bridge deflection must be known in time in order to ensure train running safety. Because there are a large number of bridges needed to be measured after the six - round train speed - increase，the existing instruments and methods to measure the bridge beam deflection are all have some certain limitations and cant meet the requirements. It is urgent to need a portable measuring instrument with features of easy operation and installation and perfect applicability.
Research conclusions: Through making the comparisons of the four current methods in China for beam deflection, the bridge deflection measuring instrument is developed based on the program of using CCD imaging technology to measure the deflection. The experimental results of measuring the bridge deflection on site with this instrument and the special deflection measuring instrument from the bridge examine organization of Beijing Railway Administration show the error is between 3. 0% - 6. 9% and the average measuring difference between them is between 3. 9% , which meets the requirement.
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Received: 18 February 2008
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2008, Vol. 25 
