Analysis on Tensioning Schemes for a Super-Long Prestressed Frame Structure
-
摘要: 针对超长预应力框架结构的张拉方案开展数值模拟分析,对结构在后浇带同步浇筑并同步张拉、后浇带分批浇筑并分段张拉两种条件下的内力分布和变形规律进行了对比;针对后浇带分批浇筑并分段张拉的情形,提出了4种张拉方案。分析结果表明:分批浇筑并分段张拉方案相较于同步浇筑张拉方案改善了边柱内力的分布,边柱最大弯矩显著降低,柱端混凝土拉应力分布情况也得到了改善;多次分批封闭后浇带并张拉后浇带所在跨的预应力筋对于结构整体性能是有利的,且随着批次的增加,这种有利效果越明显。在实际工程中,对预留的后浇带宜采取分批张拉的方案。Abstract: Numerical simulation analysis was conducted for a tensioning schemes of super-long prestressed frame structure, simultaneously, the internal force distribution and deformation law of the structure in integral pouring with synchronous tensioning and segmental pouring with segmental tensioning were analyzed and compared; four tensioning schemes were proposed and calculated respectively. The analysis results showed that compared with the overall tensioning scheme, the scheme of batched pouring and segmental tensioning could improve the internal force distribution of side columns, the maximum bending moment of side columns was significantly reduced, and the tensile stress distribution of concrete at the column ends was also improved. Additionally, it was beneficial to the overall performance of the structure by closing the post-cast strips and tensioning the prestressed reinforcement of the span where the post-cast strips were located for many times, and the beneficial effect was more obvious with the increase of batches. In the actual projects, the scheme of batched tensioning for the reserved post cast-strips should be adopted if conditions permitted.
-
[1] 吕志涛,孟少平.现代预应力设计[M].北京:中国建筑工业出版社, 1998. [2] 陈圣刚,高峰,耿娇,等.预应力型钢混凝土双坡框架抗震性能试验研究[J/OL].建筑结构学报,2021(2021-11-22)[2022-01-20] .https://doi.org/10.14006/j.jzjgxb.2021.0366. [3] 蒋方新,陈尚志,邵兴宇,等.超长混凝土结构在使用阶段温度应力下的裂缝控制[J].建筑结构, 2021, 51(14):107-111. [4] 管钟.超长联预应力混凝土连续梁桥合龙顺序对结构效应的影响[D].武汉:华中科技大学, 2019. [5] 王洪欣,王庆华,黄朝俊,等.大跨度预应力混凝土带肋叠合板力学性能试验研究与工程应用[J].建筑结构, 2021, 51(13):110-113,21. [6] 张才刚,查红华,王旭生,等.大跨度预应力无梁楼板深化设计要点及施工技术措施[J].建筑结构, 2021, 51(增刊1):2277-2280. [7] 魏路,刘翔,叶海登.珠海航展中心主展馆工程预应力混凝土柱抗拉弯性能分析[J].建筑结构, 2021, 51(4):65-70. [8] 包碧玉.超长混凝土结构考虑温度、收缩、徐变因素的应力分析及设计[J].结构工程师, 2021, 37(3):203-212. [9] 彭全敏.超长混凝土结构收缩裂缝控制研究[D].天津:天津大学, 2012. [10] 于婧.施工缝的模型化及对RC框架结构抗震性能影响的研究[D].重庆:重庆大学, 2011. [11] 蒋方新,陈尚志,邵兴宇,等.超长混凝土结构在使用阶段温度应力下的裂缝控制[J].建筑结构, 2021, 51(14):107-111. [12] 武俊燕.超长混凝土结构的间接内力和裂缝控制研究[D].南京:东南大学, 2006. [13] 温志强.超长RC框架结构温度效应非线性分析[D].南昌:南昌大学, 2020.
点击查看大图
计量
- 文章访问数: 105
- HTML全文浏览量: 6
- PDF下载量: 3
- 被引次数: 0