摘要
通过在某桥墩模板内侧埋设压力盒进行墩身混凝土的侧压力监测,发现随着混凝土的浇注,对应测点压力迅速上升,达到峰值后减小,然后保持不变;各测点形成最大侧压力耗时7.6～12.8h;实测最大侧压力为规范计算值的1.01～2.2倍。结合实测数据,在分析国内、外有关侧压力计算公式之后,偏于安全考虑,建议修订公路规范中模板侧压力计算公式。
The lateral pressure of pier shaft concrete of a bridge was monitored by burying pressure box in the pier formwork. It is found that the pressure of the corresponding testing point rapidly rises as the concrete is casted, decreases after reaching its crest value, and then keeps constant. 7.6~12.8 h had been consumed when greatest lateral pressure appeared in all the tes- ting points. The measured greatest lateral pressure is 1.01-2.2 times of that recorded in the code. Based on the measured data and the analysis of the lateral pressure calculation formula at home and abroad, and out of the consideration of safety, it is suggested that the calculation formulae of formwork lateral pressure in the Highway Code should be revised.
出处
《世界桥梁》
北大核心
2012年第2期42-45,共4页
World Bridges
关键词
现浇混凝土
模板
侧压力
研究
cast-in-place concrete
formwork
lateral pressure
study
