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| Analysis of Stability of Long － span Continuous Rigid Frame Bridge with High Pier |
| WANG Fei，TIAN Shan － po，ZHUO Yi |
| The Third Railway Survey and Design Institute Group Corporation，Tianjin 300142，China |
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Abstract Research purposes:The highway in western China or the remote region needs to cross over rivers and valleys and passes the regions with complex terrains due to the limitation of topographical condition ． For this reason，the long－span continuous rigid frame bridge with high pier becomes more and more and the height of the bridge increases from several decameters to hundreds of meters． With increases of the pier height and the span length，the research on the stability of such kind of bridge is becoming more and more important．
Research conclusions: Taking the long － span continuous rigid frame bridge with( 90 + 168 + 90) m high pier in Shanxi province as the engineering background，the basic principle related to the structure stability is discussed and the stability of the high pier，the stability of the longest cantilever during construction and the stability in complete stage of the bridge are analyzed． From the calculation results it can be seen that for the bridge presented in this paper，the temperature effect has a little influence on the high pier stability，the wind load along the bridge axial direction has the most negative impact on the structure stability in the construction stage of the longest cantilever，and during the complete stage of the bridge，the lane load and the load of the crowded people set on the middle span has the most negative impact on the bridge stability． Furthermore，wind has a little influence and the influence of the temperature effect can be ignored in this stage．The calculation results also show this bridge has a good stability during its construction process and in the complete stage of bridge．The calculation and analysis processes presented in this paper can provide the reference to the similar works．
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Received: 16 May 2012
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2012, Vol. 29 
