西北水电Issue(3)：67-73,7.DOI:10.3969/j.issn.1006-2610.2024.03.011
大跨度U形渡槽预应力钢绞线张拉顺序数值模拟及方案比选
Numerical Simulation and Scheme Comparison of Tension Sequence of Pre-stressed Steel Strand in Large-Span U-shaped Aqueduct
摘要
Abstract
To study the influence of demolding time on the stress state of the body structure of the large-span U-shaped aqueduct during the tensioning process,the tensioning scheme of the pre-stressed steel strand is compared and selected.Taking a large-span U-shaped pre-stressed aqueduct in Chi-na as an example,the interaction between pre-stressed steel strand and concrete is simulated using the single spring connection element method consid-ering temperature load,and the influence of demolding time on the stress response of aqueduct body during the tensioning process of pre-stressed steel strand is studied by numerical simulation.Then based on the stress control standard of aqueduct body and the occupation time of prefabricated pedestal of aqueduct during the tensioning process of pre-stressed steel strand,the optimum tensioning scheme of pre-stressed steel strand is proposed.The re-sults show that the application of partial longitudinal and circumferential prestress before demolding can not only meet the requirement of no tensile stress on the inner wall of the aqueduct during the tensioning process,but also reduce the occupying time of the aqueduct prefabrication pedestal.关键词
大跨度U形渡槽/拆模时机/预应力/张拉方案/数值模拟Key words
large-span U-shaped aqueduct/demolding time/prestress/tensioning scheme/numerical simulation分类
建筑与水利引用本文复制引用
汪安南,雷艳,黎康平,李同春..大跨度U形渡槽预应力钢绞线张拉顺序数值模拟及方案比选[J].西北水电,2024,(3):67-73,7.基金项目
国家重点研发计划(2022YFC3005403) （2022YFC3005403）
中国电力建设股份有限公司科技项目(DJ-ZDXM-2021-10). （DJ-ZDXM-2021-10）
