大体积混凝土底板伸缩缝理论间距的研讨

Study and Discussion on Theoretical Space of Expansion Joint for Mass-concrete Floor

上世纪70年代,根据我国大体积混凝土底板温度应力计算的现代理论,建立了最大伸缩缝间距的理论公式。但在实际应用时,却变成了经验公式,公式中各参数的取值更是凭经验,计算繁杂。本文根据同样的现代理论,推导出另一种形式的伸缩缝间距理论公式,物理意义明确,根据混凝土控制龄期段的各参数,代入该公式,只需运算一次,就可算出最大伸缩缝的理论间距。

The theoretical formula for the maximum expansion space are set up according to the modern theory of temperature stress calculation for mass concrete floor in China in the 1970＇s. But in the practice application, it has became into the experience formula and the values taken for each parameter in the formula are depended on the experiences. In such way, the calculation are complicated. The another form of theoretical formula for the expansion joint space are deviated. Its physical meaning is identify and the theoretical space of expansion joint can be calculated only once by substitution of each parameter in the section of concrete control age.