摘要
现行隧道设计规范用偏心影响系数α表征偏压构件抗压强度随偏心距增加而降低的程度，引入可靠度设计时必须知道此系数的统计特征及计算公式的不确定性。通过３批试验筛选出９９组３０７根偏心受压构件的试验结果，整理出６种相对偏心距时α系数的均值、标准差及概率分布，回归整理成关系方程。所得结果在相对偏心较小时较现行规范提高８％～１１％，试验方法经过预研论证。
The eccentric influence factor α in the present tunnel specifications is used to express the extent of decreasing of compression strength of the eccentric loading plain concrete element in accordance with the increasing of the eccentric distances .It is necessary to know the undefinition of statistical character and calculation formulae of the factor when reliability design method is introduced.The results of 307 eccentric loading elements in 99 groups based on 3 batches tests are selected.Mean value,mean error and probability distribution of the influence factor α in connection with 6 relativistic eccentric distances are got,and corresponding relation equations are obtained by regression.Compared with present specifications,the obtained result is upgraded 8￣11% when the relativistic distances are comparatively small.The result is believable,because the test method is well pre studied.
出处
《铁道学报》
EI
CSCD
北大核心
1996年第5期91-97,共7页
Journal of the China Railway Society
基金
建设司工程建设科研项目
关键词
混凝土偏压构件
抗压强度
隧道
设计
试验
compression strength of concrete under eccentric loading
eccentric influence factor
statistical character
