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| 1 | Experimental study on flexural behavior of ECC/RC composite beams with U-shaped ECO permanent formwork显示文摘To enhance the durability of a reinforced concrete structure, engineered cementitious composite (ECC), which exhibits high tensile ductility and good crack control ability, is considered a promising alternative to conventional concrete. However, broad application of ECC is hindered by its high cost. This paper presents a new means to address this issue by introducing a composite beam with a U-shaped ECC permanent formwork and infill concrete. The flexural performance of the ECC/RC composite beam has been investigated experimentally with eight specimens. According to the test results, the failure of a composite beam with a U-shaped ECC formwork is initiated by the crushing of compressive concrete rather than debonding, even if the surface between the ECC and the concrete is smooth as-finished. Under the same reinforcement configurations, ECC/RC composite beams exhibit increases in flexural performance in terms of ductility, load-carrying capacity, and damage tolerance compared with the counterpart ordinary RC beam. Furthermore, a theoretical model based on the strip method is proposed to predict the moment-curvature responses of ECC/RC composite beams, and a simplified method based on the equivalent rectangular stress distribution approach has also evolved. The theoretical results are found to be in good agreement with the test data. | Zhi QIAO Zuanfeng PAN Weichen XUE Shaoping MENG | 2019 | Frontiers of Structural and Civil Engineering2019，13，5： | 3 |
| 2 | Simulation of ductile fracture initiation in steels using a stress triaxiality-shear stress coupled model显示文摘Micromechanics-based models provide powerful tools to predict initiation of ductile fracture in steels. A new criterion is presented herein to study the process of ductile fracture when the effects of both stress triaxiality and shear stress on void growth and coalescence are considered. Finite-element analyses of two different kinds of steel, viz. ASTM A992 and AISI 1045, were carried out to monitor the history of stress and strain states and study the methodology for determining fracture initiation. Both the new model and void growth model (VGM) were calibrated for both kinds of steel and their accuracy for predicting fracture initiation evaluated. The results indicated that both models offer good accuracy for predicting fracture of A992 steel. However, use of the VGM leads to a significant deviation for 1045 steel, while the new model presents good performance for predicting fracture over a wide range of stress triaxiality while capturing the effect of shear stress on fracture initiation. | Yazhi Zhu Michael D.Engelhardt Zuanfeng Pan | 2019 | Acta Mechanica Sinica2019，35，3： | 2 |
| 3 | Truss-Arch Model for Shear Strength of Shear-Critical Reinforced Concrete Columns显示文摘 | Zuanfeng Pan Bing Li | 2013 | Journal of Structural Engineering2013，，4： | 1 |
| 4 | Effective shear stiffness of diagonally cracked reinforced concrete beams显示文摘 | PAN Zuanfeng LI Bing LU Zhitao | 2014 | Engineering Structures2014，59，2： | 1 |
| 5 | Effective shear stiffness of diagonally cracked reinforced concrete beams显示文摘 | Zuanfeng Pan Bing Li Zhitao Lu | 2014 | Engineering Structures2014，，： | 1 |
| 6 | Seismic performance of HWBBF considering different design methods and structural heights显示文摘Previous research has shown that using buckling-restrained braces(BRBs)at hinged wall(HW)base(HWBB)can effectively mitigate lateral deformation of steel moment-resisting frames(MRFs)in earthquakes.Forcebased and displacement-based design methods have been proposed to design HWBB to strengthen steel MRF and this paper comprehensively compares these two design methods,in terms of design steps,advantages/disadvantages,and structure responses.In addition,this paper investigates the building height below which the HW seismic moment demand can be properly controlled.First,3-story,9-story,and 20-story steel MRFs in the SAC project are used as benchmark steel MRFs.Secondly,HWs and HWBBs are designed to strengthen the benchmark steel MRFs using force-based and displacement-based methods,called HWFs and HWBBFs,respectively.Thirdly,nonlinear time history analyses are conducted to compare the structural responses of the MRFs,HWBBFs and HWFs in earthquakes.The results show the following.1)HW seismic force demands increase as structural height increases,which may lead to uneconomical HW design.The HW seismic moment demand can be properly controlled when the building is lower than nine stories.2)The displacement-based design method is recommended due to the benefit of identifying unfeasible component dimensions during the design process,as well as better achieving the design target displacement. | Yulong FENG Zhi ZHANG Zuanfeng PAN | 2023 | Frontiers of Structural and Civil Engineering2023，17，12： | 0 |
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