对均匀温度和梯度温度作用效应的理解

A Understanding of the Uniform Temperature and Gradient Temperature Effect

桥梁结构处于自然环境中,将受到温度作用的影响。温度作用有两种形式,一是常年气温变化,即均匀温度作用,二是太阳辐射引起的骤然升降温等短时温度变化,即梯度温度作用。而非线性分布温度即梯度温度的作用往往是设计的控制因素,要了解这两种不同的作用形式对结构受力的影响,首先要清楚其对应力分布的影响。基于此还可以解释混凝土箱形截面梁桥裂缝产生的原因,以及在设计中如何予以充分考虑。

Bridge structure in the natural environment, will be affected by the temperature effect. Temperature effect has two forms, one is a perennial temperature changes, namely the uniform temperature effect, the second one is short-term temperature changes such as the sudden temperature rise or fall caused by solar radiation,namely the temperature gradient. And the effect of the nonlinear distribution of temperature known as the gradient temperature is often designed control factors, to explore the effects of the two different forms on structure stress, it is advisable to clear their influence on stress distribution first. Based on this ,it can also be helpful to explains the reasons the cracks in the concrete box section girder bridge form, and how to give out full consideration in the design.