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分析了先简支后连续预应力桥梁受力状态,并按正常使用极限状态的设计原则,计算并讨论板开裂与预应力状态的关系,计算结果表明:如果预应力≥87%设计预应力,梁就满足全预应力构件的要求。如果87%设计预应力>预应力≥59%设计预应力,梁就满足A类预应力构件的要求,因此,由起拱值来判定梁板是否可用的标准是合理的。对于张拉龄期为3d、5d和7d三种情况,张拉龄期对预应力损失的影响很小,可以忽略不计。张拉龄期主要影响上拱值,5d和7d的差别也只有2mm。
After analyzing the stress state of prestressed simply supported continuous prestressed bridges and the design principle of limit state in normal use, the relationship between plate crack and prestressed state is calculated and discussed. The results show that if prestressed ≥87% Beams meet the requirements of all prestressed components. If 87% design prestress> prestress ≥59% design prestress, the beam will meet the requirements of Class A prestressed components, so it is reasonable to judge whether the beam board is usable according to the arch value. For the lag period of 3d, 5d and 7d three cases, the impact of pre-stress on the tensile age is small, can be ignored. Tension age mainly affect the arch value, 5d and 7d difference is only 2mm.