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随着海上工程使用預应力混凝土的日益增加,对于这种結构的梁,除了了解承受疲劳荷載梁的极限特性外,还須了解它的使用特性。本文企图計算疲劳荷載对部分預应力梁受弯的影响。考虑了混凝土的疲劳徐变和周期荷載作用下粘結力逐渐損失的影响。提出的分析模式,根据組成构件材料的疲劳特性,預估重复荷載引起的挠度和裂縫寬度的增量。把算得的挠度和裂縫寬度再与实驗結果进行比較。提供一个流程图和設計例題,以說明这个方法的应用。
With the increasing use of prestressed concrete in marine engineering, it is necessary to understand its service characteristics in addition to understanding the ultimate characteristics of a fatigue-loaded beam for such a structure. In this paper, we attempt to calculate the effect of fatigue load on the bending of some prestressed beams. Considering the fatigue creep of concrete and the effect of gradual loss of adhesive force under cyclic loading. The proposed analytical model predicts the increment of deflection and crack width due to repeated loads based on the fatigue characteristics of the constituent members. The calculated deflection and crack width are compared with the experimental results. Provide a flowchart and design examples to illustrate the application of this method.