大线间距高铁简支箱梁桥面板日照温差应力研究
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摘要
我国高铁上大量使用预应力混凝土简支箱梁,日照温差荷载对混凝土箱梁桥的受力和变形具有重要的影响。针对某高铁箱梁线间距5. 3 m的不利影响,考虑预制阶段的制梁台座和存梁台座不同支承状态,展开桥面板温度荷载及混凝土应变测试。研究结果表明:当桥面升温时,桥面板上表面混凝土横向应力为压应力,下表面为拉应力;桥面板上下缘应力与温差大小呈线性关系;在实测温差荷载和设计温差荷载作用下,结构受力安全。
The prestressed concrete simply supported box girder has been widely used in China high-speed railway.The sunshine temperature difference has an important effect on the stress and deformation of concrete box girder.The bridge deck temperature load and concrete strain tests were carried out,which considering the adverse effects of the line spacing 5. 3 m and the different supporting states in prefabricated stage and storage stage.The results showed that the top surface of concrete bridge deck had transverse compressive stress and bottom had transverse tensile stress when the bridge deck was heating up. There was a linear relationship between the transverse stress and the temperature difference. The bridge deck was safe under the measured temperature load and design temperature load.
The prestressed concrete simply supported box girder has been widely used in China high-speed railway.The sunshine temperature difference has an important effect on the stress and deformation of concrete box girder.The bridge deck temperature load and concrete strain tests were carried out,which considering the adverse effects of the line spacing 5. 3 m and the different supporting states in prefabricated stage and storage stage.The results showed that the top surface of concrete bridge deck had transverse compressive stress and bottom had transverse tensile stress when the bridge deck was heating up. There was a linear relationship between the transverse stress and the temperature difference. The bridge deck was safe under the measured temperature load and design temperature load.
引文
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[7]国家铁路局.铁路桥涵混凝土结构设计规范[S].北京:中国铁道出版社,2017.
[8]戴公连,郑鹏飞,闫斌,等.日照作用下箱梁桥上无缝线路纵向力[J].浙江大学学报(工学版),2013,47(4):609-614.
[9]张元海,李乔.斜支承箱梁的日照温度次内力研究[J].土木工程学报,2008(05):46-51.
[10]方志,汪剑.大跨预应力混凝土连续箱梁桥日照温差效应[J].中国公路学报,2007(1):62-67.
[11]赵人达,王永宝.日照作用下混凝土箱梁温度场边界条件研究[J].中国公路学报,2016,29(7):52-61.
[2] BSI.Steel,Concrete and Composite Bridges[S].British Standards Institution,1999.
[3] AASHTO.美国公路桥梁设计规范[M].辛济平,等,译.北京:人民交通出版社,1998.
[4]德国标准化研究所.桥梁的荷载[M].柏林:博伊特有限公司出版社,2003.
[5]中华人民共和国交通部.公路桥涵设计通用规范[S].北京:人民交通出版社,2004.
[6] Standards New Zealand.Bride Manual. Section 3:Design Loading[S].Transit New Zealand,2003.
[7]国家铁路局.铁路桥涵混凝土结构设计规范[S].北京:中国铁道出版社,2017.
[8]戴公连,郑鹏飞,闫斌,等.日照作用下箱梁桥上无缝线路纵向力[J].浙江大学学报(工学版),2013,47(4):609-614.
[9]张元海,李乔.斜支承箱梁的日照温度次内力研究[J].土木工程学报,2008(05):46-51.
[10]方志,汪剑.大跨预应力混凝土连续箱梁桥日照温差效应[J].中国公路学报,2007(1):62-67.
[11]赵人达,王永宝.日照作用下混凝土箱梁温度场边界条件研究[J].中国公路学报,2016,29(7):52-61.