【摘要】 通过对某斜拉桥索塔既有裂缝的长期观测,发现裂缝并不是总保持张开状态,裂缝宽度随索塔内外温差的变化而变化,即裂缝存在"温变性"现象。通过对现场观测的数据结果分析,得出了裂缝宽度与温差之间的相对变化关系,利用有限元法计算了索塔的温度场分布,同时计算了相应的温度应力。最后结合现场观测和理论分析结果,借用有效应力幅概念,解释了索塔裂缝随索塔内外温差变化这一现象的本质。更多还原

【Abstract】 The tower cracks of a cable-stayed bridge is observed for a long time,and the fact that the width of cracks will variate with different in temperature between the tower inside and outside is confirmed.Through analyzing the observation datas,the relation between the width of cracks and the change of different in temperature is obtained.Temperature field distributions of tower at the different moments is analysed by finite element method,and the corresponding temperature stress is determinated.Last,by adapting the concept of valid stress amplitude,the relation between the width of cracks and the change of different in temperature is interpreted.更多还原