摘要
通过对一典型超长预应力楼盖的部分楼层梁板在施加预应力后一段时间内应变的现场监测,给出了不同位置测点应力和温度的变化曲线.选取了部分时段内温度变化情况,分析了结构在温度作用下的响应特征.测试结果表明,环境温度的变化会引起构件应力的变化,结构中部截面是环境温度效应最不利的截面.通过对预应力楼盖的抗裂效果的理论与现场实测分析,说明利用预应力技术解决超长结构的抗裂问题是非常有效的.
By means of field monitoring the strain in beam slab of partial building floors of a typical superlength prestressed floor slab after a period of their prestressing, the variation of stress with the temperature at different monitoring locations was given. Temperature variation condition during a portion of above-mentioned period was chose to analyze the response characteristics of the structure to the temperature. It was shown by the monitoring result that the variation of ambient temperature might result in stress variation in the components, and the middle cross-section of the structure was the most unfavored one for the effect of ambient temperature. By means of theoretical analysis and field testing of the anti-split effect of prestressed building floor slabs, it was illustrated that the technique of prestressing was very effective for dealing with the anti-splitting problem in super-length structure.
出处
《兰州理工大学学报》
CAS
北大核心
2006年第6期126-130,共5页
Journal of Lanzhou University of Technology
关键词
超长楼板
抗裂
预应力
环境温度
温度应力
super-length floor slab
anti-splitting
prestress
ambient temperature
thermal stress
