摘要
通过实验方法,分析采用体外预应力技术加固的梁体刚度和抗裂性能,并将实验结果与现行规范计算结果加以对比.通过采用不同的体外布筋方式和施加不同的预压应力,分析二次效应对加固混凝土梁体短期刚度的影响,提出修正公式.考虑混凝土截面塑性降低对混凝土梁抗裂性能的影响,分析加固后混凝土梁体的抗裂性能.结果表明:采用修正公式计算加固混凝土梁的短期刚度比规范计算结果更接近工程实际,误差减少30%～40%.考虑混凝土截面塑性的降低,视体外预应力为偏心压力,所得梁体在正常使用荷载状态下的最大裂缝宽度与实测结果更加吻合,为体外预应力加固混凝土梁的理论分析和工程设计提供依据.
Researches have been carried out in external pre-stressed reinforced concrete beams by the test method to find out the stiffness and cracking performance,the test results were compared with the theoretical calculation analysis.By testing eccentricity different sizes and different pre-compressive stress on the beams,the effects of second eccentric moments on the reinforced concrete beams stiffness were gained,and the calculation formula were amended according to analysis results.Besides,considering the concrete impact of the lower section of plastic,the crack-resistant of reinforced concrete beams was studied.The results indicated that the short-term value calculated by the modified formula is closer to actual value,and the irregularities reduced by 30%~40%.Considering the concrete impact of the lower section of plastic to get the cracking moment,viewing the stressed value as eccentric pressure to calculate the reinforced concrete beam width of the largest crack,the result is closer to the actual value,and the result can give basis for theoretical analysis and engineering design of extern.
出处
《大庆石油学院学报》
CAS
北大核心
2009年第2期81-83,92,共4页
Journal of Daqing Petroleum Institute
关键词
体外预应力
梁体加固
短期刚度
抗裂性能
二次效应
external pre-stressed force
reinforced beams
short term stiffness
crack-resistant
second-order effect
