基于有限分析法的高速公路混凝土T梁桥加宽性能研究  

Study on the widening performance of highway concrete T-beam bridge based on finite analysis method

作　　者：郑成福 Zheng Chengfu(Chinaroads Communications Science&Technology Group Co.,Ltd.,Shijiazhuang Hebei 050035,China)

机构地区：[1]中交远洲交通科技集团有限公司,河北石家庄050035

出　　处：《山西建筑》2024年第11期148-151,共4页Shanxi Architecture

摘　　要：为研究桥梁加宽后的安全性能,依托某高速公路混凝土T梁特大桥加宽案例,采用理论计算与有限元建模方法对该桥加宽后的静力效应变化、新梁混凝土收缩徐变和基础沉降差异对桥梁主梁的影响进行了分析。研究结果表明:桥梁加宽后力学性能有所改善,挠度分布也更均匀;新梁混凝土收缩徐变产生附加应力显著,将影响桥梁结构的安全,随着存梁时间增大此类附加应力作用逐渐减小;加宽梁的基础沉降差异越大对桥梁的安全性越不利。建议实际施工时增加存梁时间及延迟施工以减少新梁混凝土收缩徐变与加宽梁的基础沉降差异对桥梁结构安全的影响。In order to study the safety performance of the bridge after widening,a case of widening a concrete T-beam extra-large bridge on a highway was used.Theoretical calculation and finite element modeling methods were used to analyse the changes in static effects after the bridge was widened,the impact of the shrinkage and creep of the new beam concrete and the difference in foundation settlement on the main beam of the bridge.The research results show that after the bridge is widened,the mechanical properties have improved and the deflection distribution has become more uniform;the shrinkage and creep of the concrete in the new beams will produce significant additional stresses,which will affect the safety of the bridge structure.Such additional stresses will increase as the storage time of the beams increases.Gradually decrease;the greater the difference in foundation settlement of the widened beam,the more detrimental it is to the safety of the bridge.It is recommended to increase the beam storage time and delay the construction during actual construction to reduce the impact of the difference in shrinkage and creep of the new beam concrete and the foundation settlement of the widened beam on the safety of the bridge structure.

关 键 词：桥梁加宽 有限元 拼宽效应 内力分析 

分 类 号：TU997[建筑科学—市政工程]