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| Analysis and Verification of Load Bearing Capacity of Old Bridge |
| ZHAO Chuan |
| The Third Railway Survey and Design Institute Group Corporation，Tianjin 300250，China |
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Abstract Research purposes:By verification of the load bearing capacity of the old bridge，the operation security of bridge can be appraised and the basis can be offered to the reinforcement design of the bridge．In this paper，taking a reinforced concrete simply － supported T － beam bridge as an example，the analysis and verification are made for the loading bearing capacity of the old bridge by a numerical analysis from the aspects of the overall working situation of the bridge，the corrosion degree of the steel bar and the cracking degree of beam，and the basic procedure of verifying the load bearing capacity of old bridge is offered．
Research conclusions:When verifying the load bearing capacity of old bridge，the procedures of overall inspection，detailed detection，calculation of load bearing capacity of the beam and the verification of the load bearing capacity of the bridge should be followed． It means that，firstly，the reduction coefficient is defined according to the overall working situation and the defect situation of the bridge，then the load bearing capacity of the beams with most serious defects or bearing maximum load is calculated，and finally，the load bearing capacity of the bridge is verified according to calculation result． The verification of the load bearing capacity of the bridge presented in this paper shows as the design load of this bridge is low and the bridge has some defects，the load bearing capacity of the bridge can＇t satisfy request．So the bridge must be reinforced to enhance its load bearing capacity for ensuring the operation security of the bridge．
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Received: 12 April 2011
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2011, Vol. 28 
