【摘要】：文章基于溫度場(chǎng)計(jì)算理論,利用有限元軟件ANSYS建立三塔斜拉橋斜拉索實(shí)體單元熱分析模型,并采用隨時(shí)間變化的熱工參數(shù)(導(dǎo)熱系數(shù)、比熱、熱膨脹系數(shù)、彈性模量)定義熱分析模型,同時(shí)利用ISO834升溫曲線對(duì)斜拉索施加熱荷載,計(jì)算模擬出斜拉索隨時(shí)間變化的溫度場(chǎng),得到斜拉索彈性模量的損傷程度。通過(guò)計(jì)算不同導(dǎo)熱系數(shù)耐火層下斜拉索的溫度場(chǎng)及力學(xué)性能,表明選用導(dǎo)熱系數(shù)1w/(m℃)的耐火層將顯著降低斜拉索火災(zāi)下的溫度,大大提高其抗火性能,為斜拉索的抗火計(jì)算和設(shè)計(jì)提供技術(shù)依據(jù)。
[Abstract]:In this paper, based on the theory of temperature field calculation, the thermal analysis model of cable-stayed solid element of three-tower cable-stayed bridge is established by using finite element software ANSYS, and the thermal parameters (thermal conductivity, specific heat, thermal expansion coefficient) which vary with time are adopted. The elastic modulus) defines the thermal analysis model, and uses the ISO834 heating curve to apply the heating load to the cable-stayed cable, calculates and simulates the temperature field of the cable-stayed cable with time, and obtains the damage degree of the elastic modulus of the cable-stayed cable. By calculating the temperature field and mechanical properties of cable-stayed cables with different thermal conductivity under refractory layer, it is shown that the selection of refractory layer with thermal conductivity 1w/ (m 鈩，

本文編號(hào)：2496844