Tensile and flexural creep rupture tests on partially-damaged concrete specimens

被引:43
作者
Carpinteri, A [1 ]
Valente, S
Zhou, FP
Ferrara, G
Melchiorri, G
机构
[1] Politecn Torino, Dept Struct Engn, I-10129 Turin, Italy
[2] ENEL SpA, CRIS, I-20162 Milan, Italy
关键词
Linear Elastic Fracture Mechanic; Creep Curve; Creep Crack Growth; Sustained Load; Secondary Stage;
D O I
10.1007/BF02486351
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
Three series of novel tensile and flexural creep tests on partially-damaged concrete specimens were carried out in order to gain some insight into creep crack growth and failure of strain-softening materials. In the tests, each specimen was initially loaded to a given point in the descending branch and thus had a lower load-carrying capacity than that at the peak-point. Then, the specimen was unloaded and reloaded to sustain a load which was from 70% to 95% of its current load-carrying capacity. Experimental creep curves display a three-stage process, consisting of primary, secondary and tertiary stages, with a decreasing, constant and increasing creep rate, respectively. The secondary stage dominates the whole failure lifetime, whereas both the secondary and tertiary stages are important in arms of creep deformation. Failure life-time seems to be more sensitive to the change of load level in flexural tests rather than in tensile tests. The decrease in load-carrying capacity due to damage tends to result in a shorter failure lifetime and a lower critical load level for creep rupture. The descending branch of the static load-deflection or load-CMOD curve may be used as an envelope criterion for creep fracture.
引用
收藏
页码:269 / 276
页数:8
相关论文
共 21 条
  • [1] ALKUBAISY MA, 1975, CEMENT CONCRETE RES, V27, P171
  • [2] [Anonymous], 1985, MAT STRUCT, V18, P285, DOI [DOI 10.1007/BF02472918, 10.1007/BF00962380, DOI 10.1007/BF00962380]
  • [3] CARPINTERI A, 1992, FRACTURE MECHANICS OF CONCRETE STRUCTURES /, P351
  • [4] CARPINTERI A, 1994, CREEP CRACK PROPAGAT
  • [5] Carpinteri A., 1992, APPL FRACTURE MECH R
  • [6] DOMONE PL, 1974, MAG CONCRETE RES, V26, P144, DOI 10.1680/macr.1974.26.88.144
  • [7] Elfgren L., 1989, FRACTURE MECH CONCRE
  • [8] Goodman R.E., 1980, Introduction to Rock Mechanics, V1st ed.
  • [9] HANSEN EA, 1991, RILEM PROC, V13, P829
  • [10] Hillerborg A., 1976, Cement Concrete Research, V6, P773, DOI DOI 10.1016/0008-8846(76)90007-7