混凝土的多轴强度安全系数及其应用  

Safety factor for multi-axial strength of concrete and its application

作　　者：钱向东[1] 何晓萍[1] 焦彩虹[2] 周京[1] 

机构地区：[1]河海大学力学与材料学院,江苏南京210098 [2]北京市水利规划设计研究院,北京100048

出　　处：《河海大学学报（自然科学版）》2015年第2期121-126,共6页Journal of Hohai University(Natural Sciences)

基　　金：国家自然科学基金重点项目(11132003)

摘　　要：为计算多轴应力状态下混凝土坝的强度安全系数,以混凝土重力坝为例,采用超载系数K1和失效距离系数K2分别计算多轴强度安全系数。计算结果表明,在二轴拉-压区,K1略小于单轴强度安全系数K0,在二轴压-压区,K1大于K0;无论在二轴拉-压区还是二轴压-压区,K2均小于K1和K0;混凝土重力坝的多轴强度安全系数与单轴强度安全系数具有显著差异,在强度设计与安全评价中应采用多轴强度安全系数。In order to obtain the strength safety factor of concrete dams in multi-axial stress states,taking concrete gravity dams as an example,the safety factors for multi-axial strength were calculated with the overload factor K1 and the failure distance factor K2. The calculated results show that K1 is slightly less than the safety factor K0 for uniaxial strength in the two-axial tension-compression zone,K1 is greater than K0 in the two-axial compressioncompression zone,and K2 is less than K1 and K0in the two-axial tension-compression zone and compressioncompression zone. This indicates that the safety factor for multi-axial strength of concrete dams is significantly different from the safety factor for uniaxial strength. The safety factor for multi-axial strength should be used in the strength design and safety evaluation of concrete dams.

关 键 词：混凝土坝 重力坝 多轴强度安全系数 超载系数 失效距离系数 多轴应力状态 

分 类 号：TU311[建筑科学—结构工程]