摘要
在预应力混凝土梁实际施工过程中,由于对规范中曲线段预应力筋理论伸长值计算公式的误用,造成计算的伸长值不准确;随着桥梁跨度的增长,出现了超长预应力筋,但是规范中实际伸长值的计算公式受限。针对以上2种现象,笔者结合实际工程进行计算分析,对规范中预应力筋伸长值的计算公式进行了优化,为预应力混凝土梁的施工质量控制提供了帮助。
The elongation value is not accurately calculated because the calculation formula of the theoretical elongation of prestressed in the curve section of the code is misused.With the increase of bridge span,the ulter-long prestress appear.The calculation formula of the actual elongation value is limited in the specification.According to the above two causes,an actual misused calculation formula of theoretical elongation value is corrected by example analysis and calculation formula of the actual elongation value in the specification is optimized.The actual elongation value calculation is satisfied to control the quality of prestressed concrete.
作者
段江龙
Duan Jianglong(Road and Bridge Construction Co.Ltd.of Beijing Urban Construction Group,Beijing 100124,China)
出处
《市政技术》
2021年第4期54-57,共4页
Journal of Municipal Technology
关键词
桥梁
预应力筋
超长预应力
伸长值
两端张拉
ulter-long prestress
theoretical elongation value
actual elongation value
tension at both ends
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