现浇预应力混凝土空心楼盖的舒适度试验和计算研究

Study on test and culculation of vibration serviceability of cast-in-situ prestressed concrete hollow floor structures

为研究现浇预应力混凝土空心楼盖的舒适度,对一块4边简支、净跨为8 m×8 m、筒芯内模双向布置的空心楼盖进行了动力学特性实测,其基本频率为14.25 Hz,第一振型的阻尼比为0.022。对该试验板进行了有限元分析,得到的前3阶频率和振型与实测符合良好。4块净跨为8-15.2 m、4边简支的空心楼盖计算结果表明,人行走时的振动峰值加速度比国际标准化组织ISO标准规定的满足舒适度的加速度限值小得多。空心楼盖具有很好的人行走舒适度。

To study the vibration serviceability of cast-in-situ pre-stressed concrete hollow floor structures, dynamic properties of a simply supported 8 m× 8 m hollow floor structure were measured. The measured funda mental frequency is 14.25 Hz and the first modal damping ratio is 0. 022. Finite element analysis of the test hollow floor structure was performed. The analytical first three frequencies and modal shapes are in good agreement with the measured results. Calculation results of four pieces of simply supported hollow floor structure with span of 8--15.2 m show that the peak vibration acceleration induced by human walking is much less than the limited value of vibration serviceability requirement of the ISO standards. The hollow floor structures have excellent vibration serviceability.