Flexural Analysis Model of Externally Prestressed Steel-Concrete Composite Beam with Nonlinear Interfacial Connection

Applied Sciences

Yue Sun¹  Liangjiang Chen²  Wutong Yan²  Bing Han³  Huibing Xie³ 

[1] China Building Technique Group Co., Ltd., Beijing 100013, China;China Railway Economic and Planning Research Institute Co., Ltd., Beijing 100038, China;School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China;

关键词: external tendon;    composite beam;    interfacial slip;    nonlinear behavior;    flexural analysis;   

DOI  :  10.3390/app12094699

来源: DOAJ

【 摘 要 】

Interfacial slip effects and the unbonded phenomenon of external tendons are the key mechanical features of the externally prestressed steel-concrete composite beams (EPCBs). In this paper, an 8-node fiber beam element is built for the nonlinear analysis of the composite beam with interfacial slip effects. A multi-node slipping cable element is proposed for the simulation of external tendons. The derived formulations are programmed in OpenSees as newly developed element classes to be conveniently used for the flexural analysis of EPCBs. The effectiveness of the proposed model is fully verified against the experimental tests of simply supported and continuous beams and then applied to the parametric study. The results show that the increasing deviator spacing will significantly decrease the tendon effective depth at ultimate states and further decrease the flexural capacity. The larger effective depth is beneficial to the tendon stress increments and further improves the flexural capacity. The enhancement of interfacial shear connection degree will increase the structural capacity but the effects on the tendon stress increments and second-order effects were not monotonic.

【 授权许可】

Unknown