火荷载作用下足尺混凝土连续板振动特性的实验研究

Experimental Study of Vibration of Continuous RC Slabs under Fire

实验研究表明加速度振动信号强度和板边约束有很大关系,约束越强加速度幅值越小。当裂缝产生及板与钢梁的发生相对错动时,加速度信号会发生突变。整个升温阶段振动信号大致分为三个阶段,前期和后期信号比较平稳,中期阶段振动信号比较强烈,且伴随有较多的信号突变。梁柱部位的振动信号相对较弱。完全可以通过振动信号监测混凝土板裂缝的开展情况。

Test dates showed that vibration acceleration the constraints were stronger the acceleration amphtude was and steel beams occurred the acceleration signals signal was related with the boundary constraints. When larger. When cracks and dislocation between RC slabs were strengthened suddenly. Vibration process could be divided into three stages concluding early stage, medium stage and late stage throughout the whole heating stage. Moreover acceleration signals were stable during the early and medium stages but they were strong during the medium stage and lots of sudden change of signals occurred. And vibration of the beams and central column was relatively weak. Through the analysis of the vibration signals the cracks development could be monitored.