山西建筑
山西建築
산서건축
SHANXI ARCHITECTURE
2011年
35期
172-174
,共3页
预应力混凝土现浇箱梁%预应力损失%分联结构分析
預應力混凝土現澆箱樑%預應力損失%分聯結構分析
예응력혼응토현요상량%예응력손실%분련결구분석
cast-in-place prestressed concrete box girder%prestressed loss%split with structural analysis
通过20 m,25 m,30 m跨径分别从3孔一联到6孔一联采用满堂支架施工方案的结构分析计算,根据各跨径组合中钢束联长中点截面处其有效应力数据的对比分析结果,得出以上3种跨径中跨径相对越大、跨数越多,联长中点截面处钢绞线的预应力损失越大的结论。计算结果表明:25 m,30 m跨径超过4孔一联采用满堂支架的施工方案已达不到经济、合理的设计理念要求,若设计需采用此种跨径组合的分联设计时就需要采用逐孔浇筑等其他施工方案,以达到预应力充分发挥其材料性能的目的。
通過20 m,25 m,30 m跨徑分彆從3孔一聯到6孔一聯採用滿堂支架施工方案的結構分析計算,根據各跨徑組閤中鋼束聯長中點截麵處其有效應力數據的對比分析結果,得齣以上3種跨徑中跨徑相對越大、跨數越多,聯長中點截麵處鋼絞線的預應力損失越大的結論。計算結果錶明:25 m,30 m跨徑超過4孔一聯採用滿堂支架的施工方案已達不到經濟、閤理的設計理唸要求,若設計需採用此種跨徑組閤的分聯設計時就需要採用逐孔澆築等其他施工方案,以達到預應力充分髮揮其材料性能的目的。
통과20 m,25 m,30 m과경분별종3공일련도6공일련채용만당지가시공방안적결구분석계산,근거각과경조합중강속련장중점절면처기유효응력수거적대비분석결과,득출이상3충과경중과경상대월대、과수월다,련장중점절면처강교선적예응력손실월대적결론。계산결과표명:25 m,30 m과경초과4공일련채용만당지가적시공방안이체불도경제、합리적설계이념요구,약설계수채용차충과경조합적분련설계시취수요채용축공요축등기타시공방안,이체도예응력충분발휘기재료성능적목적。
By structural analysis of 20 m,25 m,30 m span bridges from 3 to 6 span combinations with the construction methods of full framing,according to the comparison of effective stress at midpoint for the bridge with different span combinations,it is found that the prestress loss at the midpoint of the bridge is greater when the span is relatively larger and the number of span is more.The results show that: 25 m,30 m span bridge of more than four spans with full framing construction method is not a cost-effective design,if such a design is required,it needs to adopt span by span construction method or other construction plans to achieve the prestressed material properties of its full purpose.