钢筋混凝土楼板高温动力损伤识别试验研究及非线性分析

High Temperature Dynamic Damage Identification of Reinforced Concrete Slab Experimental Research and NonlinearAnalysis

为了研究钢筋混凝土楼板在发生火灾情况下,材料性能发生多大程度的劣化,对5块不同的配筋率、配筋间距、板厚的钢筋混凝土板,进行高温试验,来对这一劣化程度进行定量分析。本文主要采用单点激励多点响应法[1],运用薄板横向振动基本理论(不考虑薄膜力),对温度场进行分析,利用非线性分析,求解刚度系数、频率、振型与试验数据得出结果进行进一步比较、拟合、分析,得出损伤因子,进一步确定板的评定指标、评定方法。

In order to study the degree of deterioration of material properties of reinforced concrete floor slabs in the event of fire,high temperature tests were performed on five reinforced concrete slabs with different reinforcement ratios,reinforcement spacing,and plate thicknesses to combat this deterioration.Quantitative analysis.This paper mainly adopts the single-point excitation and multiple-point response method,uses the basic theory of transverse vibration of thin plates(without considering film forces),analyzes the temperature field,and uses nonlinear analysis to solve the stiffness coefficient,frequency,mode shape and test data.After further comparison,fitting and analysis,the damage factor is obtained,and the evaluation index and evaluation method of the board are further determined.