先简支后连续梁桥结构转换力学分析与施工技术研究
发布时间：2018-09-06 12:22
【摘要】：本论文主要内容是先简支后转连续梁桥在施工过程当中的内力渐变研究和分析,包括以下几个方面:(1)在施工过程当中,安放预制梁后形成的简支梁与简支转连续之后形成的连续梁的变形及内力的变化,经过分析得知,简支转连续梁较简支梁,在跨中引起更小的位移,且弯矩较简支梁分布更均匀;(2)在预制梁安放实现之后,就连续端湿接头段张拉和横隔梁浇筑衔接的先后顺序从事讨论,分别从定义不同的施工阶段从事阶段分析,得到的结论是先连续端湿接头段浇筑张拉施工较先横隔梁浇筑衔接更有利于结构式的受力和变形;(3)就连续端湿接头段张拉的顺序差别,从依次张拉、对称张拉和间隔张拉三个方面进行讨论,分别定义不同的施工阶段从事模拟剖析,得知,间隔张拉更有助于结构的受力及成桥的长久使用;(4)混凝土的收缩徐变在预制梁开始到成桥后的长久时间内一直在发生着变化,只是收缩徐变的速率在逐渐减小,在此分别就存梁期和成桥后三年内的收缩徐变进行讨论。就存梁期的时间进行分析,分成30天、60天、90天,剖析在这三个时间段内混凝土的收缩徐变对简支梁的影响。经过软件模拟分析,结合施工进程及施工预算,30天存梁期更优。(5)分析讨论简支连续梁桥施工实现后的1年、2年、3年内混凝土收缩徐变对成桥的影响。分析得知,混凝土的收缩徐变,在1年内对成桥的影响稍大,在成桥2年和3年的影响甚微,即混凝土收缩徐变的速率在下降。
[Abstract]:The main content of this paper is the research and analysis of the gradual change of internal force in the construction process of the simple support and then the continuous girder bridge, including the following aspects: (1) during the construction process, The deformation and the change of internal force of the simply supported beam and the continuous beam formed after the continuous transfer of the simple support beam are put into the prefabricated beam. The analysis shows that the simple supported continuous beam causes smaller displacement in the span than the simple supported beam. The moment distribution is more uniform than that of simply supported beam. (2) after the precast beam is installed and realized, the sequence of tensioning and pouring connection of the continuous end wet joint and the construction of the diaphragm beam are discussed, and the stage analysis is carried out from different construction stages, respectively. The conclusion is that the construction of continuous end wet joint section is more favorable to the stress and deformation of structure than that of the first connecting beam. (3) according to the sequence of continuous end wet joint segment tensioning, Three aspects of symmetrical tension and interval tension are discussed, and different construction stages are defined for simulation analysis. The spacer tensioning is more helpful to the force of the structure and the long-term use of the bridge. (4) the shrinkage and creep of concrete has been changing for a long time from the beginning of the prefabricated beam to the completion of the bridge, but the rate of shrinkage and creep is gradually decreasing. In this paper, the shrinkage and creep of beam storage period and three years after completion of the bridge are discussed respectively. The time of storing beam is analyzed, which is divided into 30 days, 60 days and 90 days, and the influence of concrete shrinkage and creep on simply supported beam in these three periods is analyzed. Through software simulation and analysis, it is better to save beam in 30 days combined with construction process and construction budget. (5) the influence of concrete shrinkage and creep on the completion of the bridge within 1 year, 2 years and 3 years after the construction of simply supported continuous beam bridge is analyzed and discussed. The analysis shows that the shrinkage and creep of concrete have a slight effect on the bridge in one year, but have little effect on the bridge in 2 and 3 years, that is, the rate of shrinkage and creep of concrete is decreasing.
【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.4
本文编号：2226336
[Abstract]:The main content of this paper is the research and analysis of the gradual change of internal force in the construction process of the simple support and then the continuous girder bridge, including the following aspects: (1) during the construction process, The deformation and the change of internal force of the simply supported beam and the continuous beam formed after the continuous transfer of the simple support beam are put into the prefabricated beam. The analysis shows that the simple supported continuous beam causes smaller displacement in the span than the simple supported beam. The moment distribution is more uniform than that of simply supported beam. (2) after the precast beam is installed and realized, the sequence of tensioning and pouring connection of the continuous end wet joint and the construction of the diaphragm beam are discussed, and the stage analysis is carried out from different construction stages, respectively. The conclusion is that the construction of continuous end wet joint section is more favorable to the stress and deformation of structure than that of the first connecting beam. (3) according to the sequence of continuous end wet joint segment tensioning, Three aspects of symmetrical tension and interval tension are discussed, and different construction stages are defined for simulation analysis. The spacer tensioning is more helpful to the force of the structure and the long-term use of the bridge. (4) the shrinkage and creep of concrete has been changing for a long time from the beginning of the prefabricated beam to the completion of the bridge, but the rate of shrinkage and creep is gradually decreasing. In this paper, the shrinkage and creep of beam storage period and three years after completion of the bridge are discussed respectively. The time of storing beam is analyzed, which is divided into 30 days, 60 days and 90 days, and the influence of concrete shrinkage and creep on simply supported beam in these three periods is analyzed. Through software simulation and analysis, it is better to save beam in 30 days combined with construction process and construction budget. (5) the influence of concrete shrinkage and creep on the completion of the bridge within 1 year, 2 years and 3 years after the construction of simply supported continuous beam bridge is analyzed and discussed. The analysis shows that the shrinkage and creep of concrete have a slight effect on the bridge in one year, but have little effect on the bridge in 2 and 3 years, that is, the rate of shrinkage and creep of concrete is decreasing.
【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.4
【参考文献】
相关硕士学位论文 前1条
1 李全林;日照下混凝土箱梁温度场和温度应力研究[D];湖南大学;2004年
，本文编号：2226336
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