摘要
研究主梁梁高对于大跨度预应力混凝土连续刚构长期挠度的影响。为了"过滤"掉预应力对于长期挠度的影响,突出主梁梁高这个因素,提出了三个控制预应力筋张拉力大小的原则。各原则下的计算结果表明,增加主梁梁高能够有效地减小长期挠度。同时,梁高变化时,腹板厚度变化与否对于长期挠度的影响不大。
In this paper, the deflections of different continuous rigid frame bridges with different heights of box-girder were calculated to study the influence of the height of box-girder on long-term deflection. At the same time, the influence of deadweight on long-term deflection was also studied. In order to filter the factor of prestress, three principles were raised to define the tension of prestressed tendon. Based on the calculated results, it was found that increasing of the height of box-girder can be great...
出处
《结构工程师》
2009年第5期35-39,共5页
Structural Engineers
基金
国家863计划课题(2007AA11Z103)
关键词
连续刚构
长期挠度
预应力
主梁梁高
腹板厚度
自重集度
continuous rigid frame
long-term deflection
prestress
height of box-girder
thickness of the web
deadweight intensity
