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- 저자 : Jinbao Xie (검색결과 2 건)
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Degree of hydration-based thermal stress analysis of large-size CFST incorporating creep
Jinbao Xie,Jianyuan Sun,Zhi-zhou Bai 국제구조공학회 2022 Steel and Composite Structures, An International J Vol.45 No.2
With the span and arch rib size of concrete-filled steel tube (CFST) arch bridges increase, the hydration heat of pumped mass concrete inside large-size steel tube causes a significant temperature variation, leading to a risk of thermal stressinduced cracking during construction. In order to tackle this phenomenon, a hydration heat conduction model based on hydration degree was established through a nonlinear temperature analysis incorporating an exothermic hydration process to obtain the temperature field of large-size CFST. Subsequently, based on the evolution of elastic modulus based on hydration degree and early-age creep rectification, the finite element model (FEM) model and analytical study were respectively adopted to investigate the variation of the thermal stress of CFST during hydration heat release, and reasonable agreement between the results of two methods is found. Finally, a comparative study of the thermal stress with and without considering early-age creep was conducted.
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Study on the Hydromechanical Behavior of Single Fracture under Normal Stresses
Ni Xie,Jinbao Yang,Jianfu Shao 대한토목학회 2014 KSCE JOURNAL OF CIVIL ENGINEERING Vol.18 No.6
The coupling between hydraulic and mechanical behavior of the fractured rock mass is of great significance for various civil andenvironmental engineering projects. In order to study the hydro-mechanical behavior of single fracture, seepage tests under differentconfining pressures and fracture water pressures were conducted on single shear fractures produced by triaxial loading of diabaserock samples from Danjiangkou Water Reservoir, China. Test results show that fluid pressure acting on fracture surfaces has stronginfluences on the hydraulic behavior of the fracture. Based on the classic Biot poroelasticity theory and by taking the fracture asassembling of a set of voids in rock mass, a generalized Biot coefficient is introduced to describe the interaction effect between porefluid pressure and fracture deformation. Then, a nonlinear constitutive equation for single fracture under both normal stress and fluidpressure is developed. Later, the mechanical deformation of the fracture is related to the fracture hydraulic conductivity through“cubic law”, so that a coupled mechanical-hydraulic model is proposed. All the four parameters involved in this model have theirphysical significances and can be determined through mechanical compression tests and seepage tests. A first validity of the model ismade by predicting the variation of fracture flowrates versus normal stress under different fluid pressures.
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