本文试验研究了37根配有不同预应力筋与非预应力筋、不同跨高比的无粘结部分预应力混凝土梁的极限抗弯强度。试验表明,梁的力学配筋指标 q_0是影响梁的极限强度、刚度和裂缝开展的重要参数,非预应力筋的配置大大改善了无粘结部分预应力...本文试验研究了37根配有不同预应力筋与非预应力筋、不同跨高比的无粘结部分预应力混凝土梁的极限抗弯强度。试验表明,梁的力学配筋指标 q_0是影响梁的极限强度、刚度和裂缝开展的重要参数,非预应力筋的配置大大改善了无粘结部分预应力梁的裂缝分布,跨高比对梁的强度基本没有影响。在试验研究与理论分析的基础上,结合有关文献,提出计算无粘结预应力筋极限应力和梁的极限强度的方法.还用两根6米跨曲线配筋的无粘结预应力混凝土 T 形梁进行了试验验证。展开更多
A study on fatigue behavior of unbonded partially prestressed concrete beams is presented. Model tests have been carried out in static loading and cyclic compressive loading on 15 beams with flexure. The ratios of the...A study on fatigue behavior of unbonded partially prestressed concrete beams is presented. Model tests have been carried out in static loading and cyclic compressive loading on 15 beams with flexure. The ratios of the lower limit to the upper limit of fatigue load are 0.5 and 0.3 respectively, and the frequencies of cyclic loading are 8 Hz and 4.5 Hz respectively. The experimental results of the strains of the concrete and steel bars, the deflection of test beams, and the crack width of normal section are analyzed. According to statistics and analysis of test results, the corresponding calculation models are developed and presented.展开更多
文摘本文试验研究了37根配有不同预应力筋与非预应力筋、不同跨高比的无粘结部分预应力混凝土梁的极限抗弯强度。试验表明,梁的力学配筋指标 q_0是影响梁的极限强度、刚度和裂缝开展的重要参数,非预应力筋的配置大大改善了无粘结部分预应力梁的裂缝分布,跨高比对梁的强度基本没有影响。在试验研究与理论分析的基础上,结合有关文献,提出计算无粘结预应力筋极限应力和梁的极限强度的方法.还用两根6米跨曲线配筋的无粘结预应力混凝土 T 形梁进行了试验验证。
文摘A study on fatigue behavior of unbonded partially prestressed concrete beams is presented. Model tests have been carried out in static loading and cyclic compressive loading on 15 beams with flexure. The ratios of the lower limit to the upper limit of fatigue load are 0.5 and 0.3 respectively, and the frequencies of cyclic loading are 8 Hz and 4.5 Hz respectively. The experimental results of the strains of the concrete and steel bars, the deflection of test beams, and the crack width of normal section are analyzed. According to statistics and analysis of test results, the corresponding calculation models are developed and presented.
