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柱下独立基础偏心荷载作用下,《建筑地基基础设计规范》(GB 50007—2002)采用简化公式计算地基冲切力,即忽略地基净反力的实际分布,而简单地采用基础边缘的最大净反力进行计算。考虑偏心荷载作用下地基净反力分布变化,假设地基净反力为线性变化,推导了地基冲切力的精确计算公式,并对目前《规范》简化计算公式进行了误差分析。算例结果表明,冲切力简化公式虽然偏于安全,但其计算误差主要随着基础有效高度、地基最大和最小净反力的差值而变化,最大误差可能达到15%以上。当独立基础有效高度较小、地基净反力变化较大时,需要根据地基冲切力的精确计算公式进行基础高度设计。
Under the eccentric load of independent foundations under the column, the basic design code for building foundations (GB 50007-2002) uses the simplified formula to calculate the blanking force of the foundation, which ignores the actual distribution of the net reaction force of the foundation and simply adopts the maximum net margin Reactionary force calculation. Considering the change of the net reaction force distribution under the eccentric load, assuming that the net reaction force of the foundation is a linear change, the exact formula for calculating the blanking force of the foundation is deduced, and the error analysis of the simplified formula of the “standard” is carried out. The results of numerical examples show that although the simplification formula of punching force is safer, its calculation error mainly varies with the effective height of foundation, the difference of maximum and minimum net reaction force, and the maximum error may reach more than 15%. When the effective height of the independent foundation is small and the net reaction force of the foundation varies a lot, the foundation height design needs to be based on the precise calculation formula of the foundation punching force.