华中科技大学学报（自然科学版）Issue(8)：114-118,5.DOI:10.13245/j.hust.140823
无黏结预应力混凝土梁短期裂缝试验
Experimental research on short-term crack of unbonded prestressed concrete beams
摘要
Abstract
The crack spacing and crack width of the unbonded prestressed concrete beams with HRBF500 steel bars were researched by short-term tests of 8 unbonded prestressed concrete beams and 2 reinforced concrete beams ,while the formulae for crack spacing and crack width in code for de-sign of concrete structures GB50010-2010 were evaluated . The research shows that the original method in code GB 50010-2010 is applicable to unbonded prestressed concrete beams with HRBF 500 steel bars ,but the calculated values of average crack width and maximum crack width are generally larger than those test values with the average ratios of 1 .333 and 1 .403 .Based on the test results ,the influence coefficient of elongation of concrete to crack widths between cracks αc and the expansion co-efficient of short-term crack τs are suggested to modify to 0 .58 and 1 .54 .The average ratios of the modified values of average crack width and maximum crack width agree well with the experimented o nes .关键词
无黏结预应力混凝土梁/高强钢筋/短期裂缝/裂缝间距/裂缝宽度Key words
unbonded prestressed concrete beam/high-yield-strength steel bar/short-term crack/crack spacing/crack width分类
建筑与水利引用本文复制引用
郑毅敏,王茂宇,赵勇..无黏结预应力混凝土梁短期裂缝试验[J].华中科技大学学报（自然科学版）,2014,(8):114-118,5.基金项目
国家科技支撑计划资助项目（2011BAJ10B02，2008BAE61B04）． （）
