摘要
根据工程实际需要,提出横向分段施工预应力混凝土斜箱梁结构的施工方式,并对此施工方式的箱梁桥和整体浇筑的箱梁桥进行模型试验研究与有限元计算。通过各种工况的试验加载,及对实测得到的试验数据(挠度和应变)数理统计、图表分析比较和相应的有限元分析,定量比较了两者的受力性能差异,即混凝土开裂前,横向分段施工预应力混凝土斜箱梁的挠度比整体浇筑斜箱梁的挠度约大5.3%,纵向应变比整体浇筑斜箱梁的纵向应变大13.5%,湿接缝的纵向应变是整体浇筑施工斜箱梁的纵向应变的59%。横向分段施工预应力混凝土斜箱梁截面上存在着预应力的应力重分布,此重分布应力对湿接缝的混凝土受拉变形产生了抑制作用,且现有的有限元通用程序尚无法计算此应力重分布值的大小。
The prestressed concrete skewed box girder with transverse segmental construction was brought out on the basis of the need in the engineering, and the both model experiment and FE analysis of the presented construction and the beam box with integral construction were carried out. With the analysis of the obtained data by mathematical statistics, comparison of table and graph, and the corresponding FE analysis, the difference of mechanical performances of both constructions was analyzed under various experimental loading cases. The results show that （ 1 ） the deflection of the presented construction is about 5.3% larger than that of the beam box with integral construction,the longitudinal strain is 13.5% larger than that of the latter, and the longitudinal strain of the cast concrete is 59% as large as that of the same area at the beam box with integral construction before concrete cracking; （2） there exists stress redistribution in the cross-section of presented construction, which can restrain the tensional distortion of the wet-joint, and the value of the stress cannot be computed by the current FE program.
出处
《公路交通科技》
CAS
CSCD
北大核心
2009年第3期87-93,共7页
Journal of Highway and Transportation Research and Development
基金
福建省交通科学技术研究所引进人才启动基金资助项目(YJ200801)
上海应用技术学院引进教授基金资助项目(YJ2004-01)
关键词
桥梁工程
受力性能
模型试验
有限元
预应力混凝土
横向分段施工
斜箱梁
bridge engineering
mechanical performance
model experiment
FE
PC
transverse segmental construction
skew box girder
