钢筋混凝土环形截面构件的统一破坏模型

Unified Failure Model on the Reinforced Concrete Members with Annular Section

在Nielsen模型基础上,引入钢筋的销栓作用,并考虑混凝土的抗剪承载力,建立了钢筋混凝土环形截面构件在拉、压、弯、剪和扭复合作用下的统一破坏模型.同时,将所建模型与原Nielsen模型的理论解及现有环形截面构件的实验数据进行对比.结果表明,所建模型的计算结果更接近于实际情况,其在环形截面构件设计及计算中具有较好的适用性.

Reinforced concrete structural members with annular section are commonly used in concrete chimneys,concrete pipes and elevated water tanks,as well as in large bridge columns and offshore platforms.So it is very necessary to study the mechanism of reinforced concrete annular section structures subjected to complex force combination.Based on traditional Nielsen model,a unified failure model on reinforced concrete members with annular section under combined forces of tension,compression,bending,shear and torsion was formed.The advantages of this model are to consider the dowel actions of the reinforcements and reasonably to consider the shear carrying capacity of concrete,which makes the calculation results more close to the practical situations.Then,the theoretical results of this model are compared with Nielsen model and a series of experimental results of annular section members.The comparison verifies that the new model is feasible for the design and calculation of annular section members.