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Analysis of Creep Effect of Prestressed Concrete Continuous Beam Bridge in Construction Process
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摘要: 为了研究预应力混凝土连续梁桥在采用悬臂施工方法进行施工过程中的徐变效应,对海安新通扬大运河施工过程进行了监控。推出任意时刻桥梁徐变效应的近似计算公式,提出影响系数概念,并线性回归出徐变系数公式。研究表明,回归获得的单一加载龄期徐变系数,可以利用老化理论扩展到任意加载龄期,且与我国现行桥梁规范和美国规范相比,其计算所得结果与实测结果仅存在15%范围内的误差,吻合度好,而我国现行桥梁规范和美国规范计算所得结果应变偏差均超过15%,挠度偏差均整体偏大,因而得到的计算方式具有良好的计算精度。Abstract: In order to study the creep effect of prestressed concrete continuous beam bridge in the construction process based on cantilever construction method, the construction process of Hai’an Xintongyang Grand Canal was monitored. The approximate calculation formula of bridge creep effect at any time was deduced. The concept of influence coefficient was proposed. The creep coefficient formula was obtained by linear regression. The results showed that the creep coefficient of single loading age obtained by regression could be extended to any loading age by aging theory. Compared with the current bridge codes in China and America, the calculated results and the measured results only had errors within 15 percent of the range, and the agreement was good. However, the strain deviation calculated by the current bridge code in China and the American code was more than 15%, and the deflection deviation was larger on the whole. Therefore, the calculation method obtained in this paper showed a good accuracy.
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Key words:
- prestress /
- concrete /
- continuous beam bridge /
- construction process /
- creep effect
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百度学术2. 李澄. 某预应力连续梁桥项目静载试验分析. 交通科技与管理. 2023(02): 89-91 . 百度学术3. 梁玮. 预应力混凝土连续梁桥施工控制技术研究. 工程技术研究. 2023(13): 73-75 . 百度学术4. 詹宏伟. 预应力混凝土连续梁桥悬臂施工控制技术研究. 工程技术研究. 2023(24): 65-67 . 百度学术其他类型引用(1)
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