关于钢筋混凝土结构温度裂缝控制的若干见解

Some insights on temperature crack control in reinforced concrete structures

钢筋混凝土结构构件因热胀冷缩而发生裂缝是建筑工程中常见的问题,裂缝的产生不仅与构件的长度密切相关,而且还与结构构件所受的不同“约束”状态密切相关。根据大量的工程实践,归纳出结构构件所受“约束”的几种典型约束状态,从基本概念上明确温度伸缩裂缝产生的机理和控制方法,使得工程技术人员在设计和施工中减少盲目性、增强预见性,有效控制建筑物的温度裂缝。在特殊情况下,采取适当措施后,可适当地突破现行规范关于伸缩缝最大间距的规定。

Cracking in reinforced concrete structural members due to thermal expansion and contraction is a common problem in construction engineering.The generation of cracks is not only closely related to the length of the members,but also closely related to the different“constraint”states of the structural members.Based on a large number of engineering practices,several typical“constraint”states of structural members were summarized,the mechanism and control methods of temperature expansion cracks were clarified from the basic concept,which enables engineering and technical personnel to reduce blindness,enhance foresight,and effectively control temperature cracks in buildings in design and construction.Under special circumstances,after taking appropriate measures,the maximum spacing of expansion joint in the current specification can be greatly broken through.