竹筋混凝土的热湿应力分析

根据热应力的基本原理，对竹筋混凝土在热、湿变化作用下的热湿应力变化与破坏进行了试验与分析.结果显示，竹材横向热湿膨胀系数大于纵向热湿膨胀系数，且大于混凝土的热湿膨胀系数.热湿同时增大在竹筋内产生的压应力超过竹材料抗压强度时，竹筋内部损坏而降低其抗拉强度，热湿同时减小产生的拉应力大于竹筋与混凝土的表面结合应力时，降低竹筋对构件的加强筋作用.其中温湿度降低是竹筋混凝土在设计工况下运行中产生破坏的重要原因之一.

Analysis on Thermal and Moisture Stress in Bamboo Reinforced Concrete

According to the basic principles of thermal stress, experiments and analysis were carried out on the changos of thermal and moisture stress and damage caused by the variation of thermal and moisture environment in the bamboo reinforced concrete. The results show that the coefficient of traverse thermal and moisture expansion is greater than the longitudinal coefficient in the bamboo, and also greater than the expansion coefficient of the concrete. When the pressure stress in the bamboo reinforcement caused by the concurrent enlargement of thermal and moisture exceeds the compression strength of bamboo, damage will be generated inside the bamboo reinforcement, and the compression strength will be brought down. When the tensile stress in the bamboo reinforcement caused by the concurrent decrease is larger than the surface binding stress between the bamboo reinforcement and the concrete, the function of reinforcing rib in the frame will be weakened. The fall of temperature and moisture is one of the most important reasons leading to the damage of bamboo reinforced concrete during the designed operation condition.