摘要
为确保模板工程安全,准确计算新浇筑混凝土作用于模板的侧压力,首先分析了国家现行标准中模板侧压力计算公式存在的问题;接着根据国际单位制的基本物理量,确定了影响模板侧压力的5个关键因素,重点分析了混凝土坍落度的范围,并将其作为重要因素直接引入了模板侧压力的推导;在提出模板侧压力的统一计算式后,根据混凝土侧压力计算位置处至新浇筑混凝土顶面的总高度与浇筑速度与初凝时间的乘积的关系,推导了符合量纲分析的模板侧压力的计算式,最后采用现有文献中的试验数据验证了本文的计算式的精度。结果表明:本文提出的计算式符合量纲分析结果,且在国家现行标准中模板侧压力计算公式的适用范围内,本文计算式更精确;而当超出国家现行标准中模板侧压力计算公式的适用范围时,本文计算式具有较高精度,且整体偏于安全。
To ensure the safety of formwork engineering,and to accurately calculate the lateral pressure of fresh concrete on formwork,the problems of the formulas for lateral pressure of fresh concrete on formwork,provided by the national current standards,were analyzed firstly.Subsequently,based on the basic physical quantities of the international system of units,five key factors affecting the lateral pressure of fresh concrete on formwork were identified,the range of concrete slump was emphatically analyzed.By taking concrete slump as an important factor,it was directly introduced into the derivation.According to the relation between the depth of the concrete from the top of the placement to the point of consideration in the formwork,and the product of the rate of placing concrete in forms and initial setting time,formula for calculating the lateral pressure of fresh concrete on formwork was derived.Finally,the accuracy of the proposed formula was verified by using the experimental data in the literature.The results show that the proposed formula accords with the results of dimensional analysis,and the formula is more accurate in the application range of the formula provided by the national current standards.Moreover,beyond the applicable range of the formula provided by the national current standards,the proposed formula is of high accuracy and is generally safe.
作者
陈磊
刘占科
CHEN Lei;LIU Zhan-ke(Western(Gansu)Municipal Construction Group Co.,Ltd.,Lanzhou 730030,China;Key Laboratory of Mechanics on Disaster and Environment in Western China,the Ministry of Education of China,Lanzhou University,Lanzhou 730000,China;School of Civil Engineering and Mechanics,Lanzhou University,Lanzhou 730000,China)
出处
《科学技术与工程》
北大核心
2025年第19期8198-8206,共9页
Science Technology and Engineering
基金
国家自然科学基金(52278184)。
关键词
新浇混凝土
模板侧压力
量纲分析
坍落度
统一计算式
fresh concrete
lateral pressure of formwork
dimensional analysis
slump
unified formula
作者简介
第一作者:陈磊(1983-),男,汉族,甘肃兰州人,高级工程师。研究方向:房屋建造。E-mail:282535582@qq.com;通信作者:刘占科(1981-),男,汉族,甘肃靖远人,博士,副教授。研究方向:钢结构稳定。E-mail:liuzhk@lzu.edu.cn。
