混凝土规范预应力叠合构件挠度计算方法研究

针对二次受力预应力叠合构件,我国GB50010-2010《混凝土结构设计规范》基于换算截面法和部分荷载长期效应提出了以长期刚度为主要变量的挠度计算公式。文中研究了主要参数:配筋率、预制构件与叠合构件高度比、活载恒载比、活荷载组合系数和附加挠度增大系数对长期刚度和挠度的影响规律,研究表明:长期刚度基本不随配筋率变化,随着高度比、活载恒载比增加而增大,随着活荷载组合系数和附加挠度增大系数增加而减小。

RESEARCH ON DEFLECTION CALCULATING METHOD OF STANDARD PRESTRESSED COMPOSITE MEMBERS OF CONCRETE STRUCTURES

Based on transformed section method and long-term effect of the partial load, the deflection formula in Code for design of concrete Structures GB 50010-2010 with long-term stiffness is proposed for secondary force pretressed composite members. In this paper, the research on the influence of long-term stiffness and deflection is carried out, which focuses on influence of parameters such as reinforcement ratio, height ratio between prefabricated member and composite member, load ratio between live load and dead load, combination coefficient of live load and additional deflection increase coefficient. It shows that reinforcement ratio has little effect on long-term stiffness. Long-term stiffness increases with the increase of the height ratio and load ratio between live load and dead load, and decreases with the increase of combination coefficient of live load and additional deflection increase coefficient.