大内跨小边跨框架结构预应力筋优化布置方法

发布时间：2018-07-07 09:20

本文选题：预应力混凝土 + 预应力筋　；参考：《哈尔滨工业大学学报》2017年06期

【摘要】：预应力筋的优化布置是大内跨小边跨的多跨预应力混凝土框架结构合理设计计算的关键.为满足控制截面承载力最大的需要,以往常将大跨所需预应力筋布置为连续曲线,并按水平直线延伸通过其相邻的两小跨,按这种布置方式仅使大跨内产生竖向向上的预应力等效荷载,可较好平衡大跨的竖向外荷载;而若将大跨及相邻的两小跨统一考虑,预应力筋按连续曲线布置,张拉产生的预应力等效荷载不但可有效平衡大跨的竖向外荷载而且也可平衡小跨的竖向外荷载,可以使荷载平衡得到优化实现.以一典型工程为例,分析了在相同条件下两种预应力筋布置过程中张拉引起的综合弯矩、主弯矩和次弯矩的分布和量值上差异,比较了两类布筋形式对正截面承载力计算结果的影响,验证了对大内跨小边跨框架结构统一考虑后整体上按三段连续正反抛物线预应力筋布置的合理性.
[Abstract]:The optimal arrangement of prestressed tendons is the key to reasonable design and calculation of multi-span prestressed concrete frame structures with large inner span and small side span. In order to meet the need of controlling the maximum bearing capacity of the section, the prestressed tendons needed for the long span are arranged as a continuous curve and extended through the two adjacent small spans according to the horizontal straight line. According to this arrangement, only vertical upward equivalent load is produced in the long span, which can balance the vertical external load of the long span, and if the long span and the two adjacent small spans are considered uniformly, the prestressed tendons are arranged according to the continuous curve. The prestress equivalent load produced by tensioning can balance not only the vertical external load of long span but also the vertical load of small span, so that the load balance can be optimized. Taking a typical project as an example, this paper analyzes the distribution and value difference of the comprehensive bending moment, the principal moment and the secondary moment caused by the tensioning during the arrangement of the two kinds of prestressed tendons under the same conditions. The influence of two types of reinforcement on the calculation results of normal section bearing capacity is compared, and the rationality of the layout of prestressed tendons with three sections of continuous positive and negative parabola is verified after the unified consideration of large inner span and small side span frame structure.
【作者单位】：哈尔滨工业大学土木工程学院;结构工程灾变与控制教育部重点实验室(哈尔滨工业大学);
【基金】：黑龙江省应用技术研究与开发计划项目(2013G0763) 中央高校基本科研业务费专项资金资助(HIT.KISTP.201428)
【分类号】：TU378.4

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