摘要
根据深基坑开挖过程中钢筋混凝土支撑构件的受力状态,将杆件简化为两端受轴向压力的简支梁,以有轴向力作用下极限平衡状态的隔离体为计算模型建立平衡方程,引入平面应力状态下的强度准则及变形协调条件,对支撑构件受剪表达式进行了推导,得出了具有物理意义的计算公式并进行了合理简化。将推导的公式和规范公式分别与试验值进行对比后可以看出,本文所推导的公式较规范所采用的公式更接近试验值,变异系数较小,计算值与试验值具有良好的一致性。
Based on the stress state of reinforced concrete brace members in deep foundation pit excavation,the members were simplified as the freely supported beams with axial compressive force at both ends.A balance equation was established by means of free body as calculated model in ultimate balance with axial force.The strength criterion under the state of plane stress and deformation compatibility condition was introduced,and the shear expression formula of the brace member was derived.A formula with physical meaning was given and simplified.Compared with the experimental results,it can be seen that the values calculated by the deriving formula are more approximate to the experimental ones than the values by the code formula.The coefficient of variability is smaller,so the predicted and experimental values have the good compliance.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2008年第S1期257-259,共3页
Chinese Journal of Geotechnical Engineering
关键词
混凝土支撑
受剪
变形协调
深基坑
计算模型
reinforced concrete brace
shear
compatibility of deformation
deep foundation pit
model
