混凝土早期强度和安全施工的交互影响

Early-age concrete and safe construction interdependence

基于混凝土早期强度的发展特性和混凝土结构施工安全的要求,建议了施工周期和模板及其支撑层数的确定方法;探讨了按照规定强度拆模时混凝土结构仍旧出现安全问题的原因,建议了在设计荷载比取值不同时确定混凝土拆模强度的方法;在有关规范没有明确施工活荷载取值的情况下,建议了基于选定的施工周期和模板及其支撑层数的施工活荷载取值确定方法。

It is proposed that an analysis method of construction period and formwork levels based on the early-age concrete strength development characteristic and safe construction requirements.Probing into that the concrete structure still keeps appearing the reason of safe problem even if formwork removal in according to the stated concrete strength,a method is recommended for analyzing essential concrete early-age strength of formwork removal when the designed live load/dead load ratio take a different value.Under the sistuation that there has no any specification of construction live loads in the relevant codes, a determining method of the maximal finite value of construction live loads is pointed out based on the selected construction cycle and formwork levels.