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- 저자 : Xueyuan Yan (검색결과 3 건)
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Experimental Research on Impact Resistance of Partially Precast Concrete Beams
Huimin Mao,Xueyuan Yan,Chenchen Zong,Cihang Lin,Xuhong Liu 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.9
A building may be subjected to multiple accidental loads during its service-life. Partially precast concrete (PC) beam is a primary force-bearing member. When subjected to an impact load, its impact resistance will significantly affect the overall safety of the structure. In this study, five PC beams were designed and manufactured, and drop-hammer impact tests were performed. The influences of impact mass and impact height on the failure mode and the dynamic response of the component under different loading conditions were examined. The typical failure mode of the test beam under a dynamic load was derived from the failure mode and crack distribution. The dynamic responses such as impact force, supporting reaction force, and displacement–time-history curve were obtained by the test. With increasing impact energy, the peak impact force increased from 3,353 to 3,708 kN, the peak mid-span displacement increased from 33.6 to 47.3 mm, and the residual mid-span displacement increased from 11.9 to 15.1 mm. Subsequently, the law of energy dissipation in the impact process was analyzed using the combined curves of the impact force-mid-span displacement and support reaction force-mid-span displacement. Furthermore, the result obtained by the integration of the reaction force-displacement curve in the middle of the span is more suitable for evaluating the overall energy consumption of the beam. The vibration energy and internal energy of the beam itself account for the primary part of the remaining energy.
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Liyuan Wang,Xueyuan Yan,Binghui Fan,Ruoyu Jin,Tong Yang,Georgios Kapogiannis 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.8
This pedagogical study presents building information modeling (BIM) education in the final semester construction management (CM) program. The case study conducted in Fuzhou University extends BIM education from a single BIM course in earlier undergraduate years to the senior year’s final semester project, which was designed to enable BIM utilization in multiple construction tasks (e.g., 3D site planning). This study consists of two major parts. The first part starts with the newly designed course of the final semester project of CM students. Students’ final semester project work is demonstrated depending on their selected deliverable type, which includes full BIM application group work, two partial BIM application types (i.e., construction planning/scheduling, and take-off estimate), and a research dissertation. The second part starts from the research hypothesis of whether the different deliverable type selected by students would affect their perceptions towards the final project and their professional career. Based on a follow-up questionnaire survey to the whole CM student sample aiming to test the hypotheses with statistical analyses (e.g., analysis of variance and the post-hoc analysis), it was indicated that all the four different deliverable types (i.e., subgroups) could lead to consistent perceptions of the final semester project towards their career development. However, subgroup differences were found. For example, students from the subgroup of full BIM application perceived that they had the highest level of hands-on skill enhancement throughout the project, possibly due to the fact that they linked BIM software tools to virtual reality (VR) hardware. Suggestions were provided to update the future BIM pedagogy in the final semester project, such as proper guide of CM students to opt their project deliverable type depending on their career interests, motivations in BIM utilization, and skill development needs. This current study provides insights in BIM education in terms that: 1) BIM education could be enhanced from a single course level to the senior year project in the CM program level; 2) different options offered in the final stage project within the CM curriculum might affect students’ perceptions towards BIM or their career development; and 3) the experience learned from this case study could be shared in the global community of construction education to update the curriculum incorporating information and communication technologies (e.g., BIM and VR). Future educational work in BIM could continue adopting existing educational theories (e.g., Bloom’s Taxonomy) by addressing the various levels of student learning, and viewing BIM in the bigger picture of digital construction.
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Huimin Mao,Xueyuan Yan,Chenchen Zong,Cihang Lin 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.5
A building can be subject to multiple accidental loads during its service life. Partially precast concrete (PC) beams are primary force-bearing members. When subjected to an impact load, their impact resistance considerably affects the overall safety of the structure. In this study, we performed numerical analyses of the dynamic response of PC beams subjected to impact loading. The related parameters, including the element type, material model, contact type, and hourglass control, were discussed in detail. The simulation and test results were compared. The model's validity is verified from four aspects: energy conversion, failure form, impact-force time history curve, and midspan-displacement time history curve. Based on these findings, the effects of the concrete strength, longitudinal reinforcement ratio, and stirrup ratio on the impact resistance of the components were evaluated. Furthermore, the differences in the equivalent plastic strain cloud diagram, impact-force time history curve, and midspan-displacement time history curve under different parameters were compared. The results show that an increase in the strength of the post-pouring concrete can reduce local damage to PC beams, and improving the overall strength of concrete can reduce overall damage of PC beams. In addition, an increase in the longitudinal reinforcement ratio can ease the failure of the normal cross-section of PC beams, and an increase in the stirrup ratio can effectively inhibit the generation and development of oblique cracks. Then, by fitting the parameters, we established simplified formulas for calculating the peak and residual values of the midspan displacement. According to the formulas, when the external impact mass and height are known, the component's damage degree can then be predicted, which provides a basis for the design of fabricated structures.
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