calculation of the reliabitity index of the concrete structure based on the maximum crack width 基于最大裂缝宽度计算混凝土结构的可靠度指标
when the stress level is lower and the stress ratio is larger, the maximum crack width is smaller and develops more placidly 应力水平越低、应力比越大,最大裂缝宽度越小、发展越平稳。
the influence of stress ratio on maximum crack width of specimens is obvious, and the larger the stress ratio is, the longer the fatigue life is, it can influence the mechanical property of specimens directly 应力比对试件梁的最大裂缝宽度影响显著,应力比越大,疲劳寿命越长,直接影响试件梁在疲劳荷载作用下的性能。
the formulas on crack width of rc beams and src beams are analyzed at home and abroad too . the calculation formulas on the maximum crack width of src beam under short time load are suggested . the calculation result tallies that of tests well 分析比较了国内外钢筋混凝土梁和劲性钢筋混凝土梁裂缝计算公式,提出了劲性钢筋混凝土梁在短期荷载作用下的最大裂缝宽度计算公式,其计算值与试验值吻合较好。
3 . the mid-span deflection of slight corrosion specimens is smaller than that of non-corrosion specimens on the static loads and the fatigue loads; the maximum crack width of slight corrosion specimens is larger than that of non-corrosion specimens; fatigue life of slight corrosion specimens is shorter than that of non-corrosion specimens; the corrosion of re-bars is a sensitive factor to fatigue life (3)轻微锈蚀试件梁的跨中挠度在静载和循环荷载下比未锈蚀梁小;轻微锈蚀试件梁的最大裂缝宽度比未锈蚀试件梁的最大裂缝宽度大;轻微锈蚀试件梁的疲劳寿命比未锈蚀试件梁的疲劳寿命降低,钢筋锈蚀是疲劳寿命的敏感因素。