發(fā)布時(shí)間：2018-12-20 16:32

【摘要】：針對(duì)混凝土結(jié)構(gòu)在太陽(yáng)輻射和氣溫變化等環(huán)境因素的影響下容易產(chǎn)生不均勻溫度分布,從而引起結(jié)構(gòu)靜動(dòng)力性能變化的問(wèn)題,設(shè)計(jì)、制作了混凝土板溫度效應(yīng)實(shí)驗(yàn)?zāi)Ｐ?安裝多個(gè)溫度傳感器測(cè)試結(jié)構(gòu)的溫度梯度和環(huán)境溫度,并測(cè)量了一整天的溫度變化狀況及結(jié)構(gòu)的動(dòng)力特性.基于模態(tài)測(cè)試?yán)碚撻_(kāi)發(fā)了模態(tài)識(shí)別程序包,以識(shí)別結(jié)構(gòu)的頻率、振型和阻尼比等動(dòng)力特性參數(shù).實(shí)驗(yàn)結(jié)果表明,溫度對(duì)結(jié)構(gòu)的自振頻率造成了一定的影響,結(jié)構(gòu)溫度升高1℃時(shí)引起的第1階和第2階頻率分別減小0.074和0.228 Hz.
[Abstract]:In order to solve the problem that concrete structure is prone to produce uneven temperature distribution under the influence of environmental factors such as solar radiation and temperature change, the experimental model of temperature effect of concrete slab is designed and made, which leads to the change of static and dynamic performance of concrete structure. Several temperature sensors were installed to test the temperature gradient and ambient temperature of the structure, and the temperature variation and the dynamic characteristics of the structure were measured throughout the day. Based on the modal testing theory, a modal identification package is developed to identify the dynamic parameters of the structure, such as frequency, mode shape and damping ratio. The experimental results show that the temperature has a certain effect on the natural frequency of the structure. The first and second order frequencies of the structure are reduced by 0.074 and 0.228 Hz. respectively when the temperature rises at 1 鈩，

本文編號(hào)：2388248