推扭荷载作用下刚性扩大基础设计计算方法

Design and Calculation Method of Rigid Spread Foundation Subjected to Horizontal Force and Torque

多杆合一杆件基础在风荷载作用下受到水平力、弯矩及扭矩的作用,而现行杆件基础设计中并未考虑扭矩,这可能导致基础发生扭转破坏。根据杆件基础的受力形式,建立了对应的简化计算模型,对水平力⁃偏心弯矩、扭矩两种承载工况下基础受力与变形进行理论分析,进一步得到推扭荷载作用下扩大刚性基础的破坏包络线。分析不同高长比对其破坏包络线的影响,并对其进行拟合,得到其理论解答。采用室内模型试验对理论计算方法进行验证。

The foundation of integrating multiple bars into one bar is subjected to horizontal force,bending moment and torque under wind load.However,the torque is not considered in the current design of the bar foundation,which may lead to torsional failure of the foundation.According to the stress form of the bar foundation,the corresponding simplified calculation model was established.The theoretical analysis of the foundation stress and deformation under the two load conditions of horizontal force⁃eccentric bending moment and torque was carried out,and the failure envelope of the expanded rigid foundation under the push⁃torsion load was further obtained.The influence of different height⁃length ratios on the failure envelope is analyzed and fitted to obtain the theoretical solution.The theoretical calculation method is verified by an indoor model test.