基于极限强度法的地连墙兼做水池壁板接头弯矩计算方法

Calculation of Bending Moment of Diaphragm Wall Joints for Water Pool Based on Ultimate Strength Method

地下连续墙兼做永久结构体的"两墙合一"具有很好的经济价值,工程应用越来越多,但作为主体结构时,其接头处的抗弯强度很难控制,成为墙体开裂的薄弱点。基于钢筋混凝土黏结-滑移本构理论,采用极限强度法思想,建立了搭接处抗弯能力的上下极限值计算方法。结合海口市白沙门污水处理厂水池壁板设计实际工程,分析不同搭接长度和不同搭接钢筋间距对抗弯能力设计值的影响规律。研究成果为搭接钢筋长度和间距的优化设计提供了理论依据,对进一步促进中国地下连续墙兼做永久主体结构的建设发展具有重要实际意义。

The diaphragm wall as a permanent structure has good economic value and has been applied by more and more engineering projects.However,as the main structure,the bending strength of the joint is difficult to be controlled,which becomes the weak point of wall cracking.Based on the bond-slip constitutive theory of reinforced concrete and the idea of ultimate strength method,a calculation method of upper and lower limit values of flexural capacity of lap joint was established.In the actual design project of the wall slab of Baishamen sewage treatment plant in Haikou City,the influence of different overlapping length and spacing of overlapping steel bars on the design value of bending resistance were analyzed.The results provide a theoretical basis for optimizing the length and spacing of overlapping steel bars,and promote the underground diaphragm wall as a permanent main joint in China,which is obviously important for the construction and development of diaphragm as a part of permanent structure.