摘要
为研究长期处于潮湿易腐蚀环境中的悬索桥主缆内部温、湿度的分布及变化规律,设计主缆缩尺模型室内试验,在特制环境模拟房中放置主缆模型(长4m,直径30cm),进行4种工况下的环境模拟,布置温湿度传感器对主缆温度和含湿量进行监测,获得主缆内部温、湿度的分布规律,并计算主缆的热传导率和热交换系数。结果表明:含湿量分布规律与温度分布规律相似,环境温度上升后,主缆内部的温度和含湿量均随时间上升;外界温度越高,主缆内部温度和含湿量越快达到稳定;对主缆局部加热时,主缆截面会出现明显的温度梯度分布,含湿量分布也不均匀;主缆内部含积水时,其横截面内温湿度分布相较干燥状态更不均匀,梯度分布更加明显。
To study the distribution and change laws of the temperatures and humidity in the main cable of suspension bridge that has been in the humid and corrosive environment for of long time, the scale-down model of the main cable of the suspension bridge was designed and the indoor test for the model was made. In the room of the simulated special environment, the model of the main cable （4 m in length and 30 cm in diameter） was placed. The environment of 4 conditions was simulated, the temperature and humidity sensors were arranged and the temperatures and humidity ratios in the main cable were monitored. The distribution and change laws of the temperatures and humidity in the main cable were acquired and the thermal conductivity and thermal exchange coeffi-cients of the main cable were calculated. The results indicate that the distribution and change laws of the humidity ratios are similar to those of the temperatures. At the rise of the ambient tempera-tures ,the temperatures and humidity ratios in the main cable rise with the passing of the time. The higher the external temperatures a re, the faster the temperatures and humidity ratios will come to the stability When the cable is locally heated the obvious temperature gradient distribu tion appears in the section of the main cable and the distribution and changes of the humidity ratios are not uniform. When the water gathers in the main cable, the distribution and changes of the temperatures and humidity in the section of the main cable become even more non-uniform as com-pared to those in the section of the cable in the dry state and the temperature gradient distribution is more obvious.
出处
《桥梁建设》
EI
CSCD
北大核心
2017年第2期42-47,共6页
Bridge Construction
基金
浙江省交通运输厅科技项目(2014H20)
浙江省自然科学基金项目(LQ14E080001)
浙江省科学技术厅科技项目(2015F50026)~~
关键词
悬索桥
主缆
温度
含湿量
模型试验
热传导率
热交换系数
suspension bridge
main cable
temperature
humidity ratio
model test
thermalconductivity
thermal exchange coefficient
