予力砼结构裂缝控制验算的简化

Simplification of Crack Checking and Controlling on Given-Force RC Structure

传统的预应力砼裂缝控制,计算公式繁琐,参数多杂,令人望而生畏。对整体砼结构的计算结果,代表性差。采用索梁分载法,可以妥善解决这一问题。由索结构承担的荷载产生挠度裂缝在建造过程中由予力完成。而使用状态下裂缝的开展及宽度的控制,则由普筋和索非予力部分承担的荷载产生。同设计普筋结构一样,一般结构可以不需详细验算裂缝的开展。

The conventional crack checking and controlling approach is too complicated to be favored because of the too many parameters and computation involved in them. It also poorly represents the actual stress strain situation in an intergral structure. However, the cabal-beam approach we published can solve this problem reasonably and easily. According to this method, the deflection and crack caused by the load supposed to be carried by the cable have been finished through given force during the stage of construction. The development and control of cracking is caused by the load, which is supposed to be carried by the regular bars and non-prestress cables. therefore, it is not necessary to check the crack width for general structures.