中美英规范关于输电线路板式基础冲切承载力的对比分析

Comparative Analysis on Punching Capability of Pad and Chimney Foundation of Transmission Tower Based on Chinese,American and British Standard

从降低基础底板厚度以达到节约混凝土和降低基础本体费用的角度出发,阐述和分析了中、美、英三国规范在板式基础冲切承载力计算方面的异同。通过对比发现:冲切承载力计算时,相比中标及美标,英标额外考虑了底板纵筋配筋率的影响;各计算参数相同时,按照美标计算的基础抗冲切承载力最大,中标及英标趋于保守;基础底板配筋率和混凝土强度等级是影响英标冲切承载力分界点的主要参数;对冲切计算起控制作用的基础,按照美标设计时可以做到用料最省。

In this paper,from the aspect of reducing the foundation slab thickness to save and re?duce the cost of concrete foundation,comparative analysis on punching capability of pad and chim?ney foundation of transmission tower based on Chinese,American and British Standard are carriedout to find the difference.By comparison the following conclusions are made.First,the effect ofslab reinforcement is considered additionally in British computing method;second,the punching ca?pability calculated according to the American Standard are the biggest;third,reinforcement percent?age and concrete grade are the two main parameters that affect the critical point of punching capa?bility of foundation;fourth,while design foundations controlled by punching capability the Ameri?can Standard always producing the most cost-effective.