同济大学学报（自然科学版）2012，Vol.40Issue(9)：1306-1311,6.DOI:10.3969/j.issn.0253-374x.2012.09.005
高温后混凝土断裂韧度及软化本构曲线确定
Determination of Residual Fracture Toughness and Softening Traction-separation Law of Post-fire Concrete
摘要
Abstract
Investigations on the softening feature of post-fire concrete was implemented in present research by adopting the bilinear softening traction-separation law at room temperature. A new parameter A, which directly influenced on the shape of softening curve, was introduced. According to initial fracture toughness and unstable fracture toughness determined by the wedge-splitting method and the quantitative relationship among initial fracture toughness, unstable fracture toughness, and cohesive fracture toughness, the softening constitutive curve of post-fire concrete was obtained through adjusting the parameter A o It is concluded that the softening traction-separation law obtained at room temperature with minor adjustments can also be applied to describing the softening feature of post-fire concrete.关键词
混凝土/双线性软化本构曲线/高温后/黏聚韧度/软化特性Key words
concrete/ bilinear softening traction-separation law/ post-fire/ cohesive fracture toughness/ softening feature分类
建筑与水利引用本文复制引用
陆洲导,俞可权..高温后混凝土断裂韧度及软化本构曲线确定[J].同济大学学报（自然科学版）,2012,40(9):1306-1311,6.基金项目
土木工程防灾国家重点实验室基金(SLDRCE09-D-02) （SLDRCE09-D-02）
