邹金林    （奥雅纳工程顾问香港有限公司上海代表处 200021）

[提要]  在阐述结构上的荷载作用和裂缝产生原因的基础上，结合一工程事故，分析了温度、收缩和徐变等变形荷载作用产生裂缝的机理。根据工程实际计算了变形荷载作用下的内力，其结果与工程事故的情一致。最后提出工程实践中进行裂缝控制的结论和建议。
[关键词]  变形荷载  裂缝控制  伸缩缝  温度应力  收缩应力  徐变作用  应力松驰

On the basis of theoretical analysis about generation and development of crack on floorboard, its generating mechanism under the action of racking load, such as temperature, shrinkage and creep, is interpreted with a fault case. The internal forces caused by the action of racking load, which is calculated, are the same as the results of the actual measurement. In the end, some conclusions and propositions about the control and design of crack are presented.
Keywords: racking load; crack control; expansion joint; temperature stress; shrinkage stress; creep; stress relaxation