Application to durability verification and improvement accuracy of time-dependent structural analysis method

提出了一种基于刚体弹簧法的三维时变结构分析方法，该方法适用于准确模拟混凝土的开裂行为。验证了该方法在混凝土结构退化预测中的适用性。将该方法应用于钢筋锈蚀问题和防火问题，这两个问题都是混凝土结构耐久性验证的重要问题。该方法不仅可以评估混凝土的腐蚀裂缝扩展行为，还可以评估混凝土砌块从既有结构上的剥落情况。在防火问题上，模拟了火灾引起的爆炸剥落行为，阐明了爆炸剥落的机理。

A 3-dimensional time-dependent structural analysis method was developed based on Rigid Body Spring Method, which is applicable to simulate cracking behavior of concrete accurately. The applicability of the developed method on the degradation prediction of concrete structures was verified. The method was applied to the phenomenon of rebar corrosion problem and fire proof problem, which both are important problem for durability verification of concrete structures. The method could evaluate not only corrosion crack propagation behaviors but also spalling of concrete block from an existing structure. Regarding the fire proof problem, the explosive spalling behavior could be simulated due to fire and the mechanism was clarified.