發(fā)布時(shí)間：2018-07-15 10:22

【摘要】：為了提出混凝土箱形墩合理的負(fù)溫差分布模式并準(zhǔn)確計(jì)算溫差應(yīng)力,對(duì)混凝土箱形墩寒流降溫作用進(jìn)行了連續(xù)觀測(cè),并基于觀測(cè)結(jié)果及溫度場(chǎng)和溫致效應(yīng)的參數(shù)分析,研究了大氣降溫速率、大氣降溫幅度和壁厚變化對(duì)溫差分布的影響,確定了不同壁厚箱形墩負(fù)溫差分布模式。結(jié)果表明:寒流降溫作用下,混凝土箱形墩各側(cè)溫差分布基本一致;壁厚不同的箱形墩,其負(fù)溫差分布模式不同;在相同大氣降溫幅度下,降溫時(shí)刻的初始溫度分布對(duì)箱形墩降溫過(guò)程中的結(jié)構(gòu)反應(yīng)增量影響較小;對(duì)壁厚0.6m的箱形墩,大氣降溫20℃所導(dǎo)致負(fù)溫差產(chǎn)生的橫向拉應(yīng)力可達(dá)3.562 MPa。
[Abstract]:In order to put forward a reasonable negative temperature difference distribution model of concrete box pier and calculate the temperature difference stress accurately, the cold current cooling effect of concrete box pier was continuously observed, and based on the observation results and the parameter analysis of temperature field and temperature effect, The influence of the temperature drop rate, the temperature drop amplitude and the wall thickness on the temperature difference distribution is studied, and the negative temperature difference distribution model of the box pier with different wall thickness is determined. The results show that the temperature difference distribution of concrete box pier is basically the same under the action of cold current, the negative temperature difference distribution mode of box pier with different wall thickness is different, and under the same atmospheric cooling range, the negative temperature difference distribution mode of box pier with different wall thickness is different. The initial temperature distribution at the cooling time has little effect on the increment of the structural response in the cooling process of the box pier, and for the box pier with a wall thickness of 0.6 m, the transverse tensile stress caused by the negative temperature difference caused by 20 鈩，

本文編號(hào)：2123754