The negative plastichingeline in the plate was evaluated by using variational approach, then an equation for calculating the ultimate load carrying capacity was developed.
首先利用变分原理确定板的负塑性铰线方程,继而推导出极限承载力的表达式。
2
The loci of plastichingeline and the maximum load during first roof weighting are determined by using kinematical method, and the minimum span of roof key stratum is derived.