635 MPa 级热轧带肋高强钢筋混凝土短柱的偏压性能与承载力计算

为了研究新型635 MPa级热轧带肋高强钢筋应用在主要建筑构件中的力学性能,文章基于635 MPa级热轧带肋高强钢筋混凝土短柱的偏压性能试验,建立其在偏压荷载下的精细化有限元模型,分析偏心率、配筋率、混凝土强度、截面高宽比等关键参数对其破坏模式、承载力、延性等力学性能指标的影响规律,得到其在偏压荷载下的全过程受力特征,确定635 MPa级热轧带肋高强钢筋与混凝土强度的匹配特性,揭示试件在2种偏压状态下的内在受力机理,最后提出635 MPa级热轧带肋高强钢筋承载力理论计算方法。研究结果可为新型635 MPa级热轧带肋高强钢筋在实际工程中的设计和应用提供一定的理论依据。

In order to study the mechanical properties of a new type of 635 MPa grade hot-rolled ribbed high strength steel bar applied to the main building components, based on the eccentric compression performance testing on short concrete column reinforced with 635 MPa grade hot-rolled ribbed high strength steel bars, its refined finite element model under eccentric load is established, and the effects of the key parameters including the eccentricity ratio, reinforcement ratio, concrete strength and section aspect ratio on the mechanical indexes such as failure mode, bearing capacity and ductility are analyzed. Its stress characteristics under eccentric load are obtained, the matching features of 635 MPa grade hot-rolled ribbed high strength steel bar and concrete strength are determined, and the internal stress mechanisms of the components under two kinds of eccentric compressions are revealed. Finally, the theoretical calculation method of the bearing capacity of 635 MPa grade hot-rolled ribbed high strength steel bar is put forward. The results can provide a theoretical basis for the design and application of new type of 635 MPa grade hot-rolled ribbed high strength steel bar in practical engineering.