EXPERIMENTAL STUDY ON CREEP COEFFICIENT EFFECTED BY PRESTRESSED DEGREE OF PRESTRESSED CONCRETE BEAM
Through observing four simple-supported prestressed beams under long-term loads, whose prestressed degree are different and span length are all 7.5m, the timehistory curves of creep coefficient and deflection creep coefficient in mid-span were plotted. According to the measured creep strain in different height in mid-span section in subsequent time, the Assumption of Plane Section also adapting to beams under longterm loads was proved and the beams neutral axis displacement were characterized. Based on the Assumption of Plane Section and the geometry model being established by experimental results, and combined with curvature, which the curvature creep coefficient of full-prestressed concrete beam is greater than the creep coefficient is testified, but it is converse to that of partial-prestressed beam. Furthermore, it is demonstrated that creep deflection is greater than the creep coefficient multiplied by instantaneous deflection for the full-prestressed concrete beam under sustained load, but it is opposite to that of partial-prestressed concrete beam.
prestressed degree long-term loads creep deformation assumption of plane section curvature creep coefficient
Jun Wang Li-Xin Liu Shi-Yu Shang
College of Civil Engineering, Zhengzhou University, Zhengzhou 450001, P.R. China Department of City & Environment, Xuchang University, Xuchang 461000, P.R. China
国际会议
广州
英文
1070-1075
2009-11-28（万方平台首次上网日期，不代表论文的发表时间）