| 冲击荷载作用下装配式钢筋混凝土梁力学性能研究 |
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| 引用本文： | 闫秋实, 邵慧芳, 李亮. 冲击荷载作用下装配式钢筋混凝土梁力学性能研究[J]. 工程力学, 2017, 34(4): 196-205. DOI: 10.6052/j.issn.1000-4750.2016.03.0239 |
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| 作者姓名： | 闫秋实 邵慧芳 李亮 |
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| 作者单位： | 北京工业大学城市与工程安全减灾教育部重点实验室, 北京 100124 |
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| 基金项目： | 国家973计划项目（2015CB058000）；青年科学基金项目（51308019）；北京市教委项目（KM20160005014） |
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| 摘 要： | 为了研究装配式钢筋混凝土梁（简称PC梁）的抗冲击力学性能，通过对5根PC梁和1根作为对比的现浇钢筋混凝土梁（简称RC梁）进行落锤冲击试验，研究了不同拼装位置和套筒灌浆料饱满度对PC梁的抗冲击性能影响。详细地分析了各个试件的破坏形态、冲击力、支座反力、跨中位移、整体变形耗能能力等性能。结果表明：1）冲击作用位置，拼装位置以及冲击荷载强度共同影响构件的破坏形态。随着冲击位置远离于构件拼装位置，PC梁破坏形态、接触刚度、整体抗冲击刚度等力学性能均接近于RC梁的力学性能，其抗冲击性能的设计可以参考RC梁进行设计；2）相同强度的冲击荷载作用下，预制试件拼装位置与冲击位置相同时，PC梁破坏形态表现为拼装处严重的局部破坏，刚度退化较大，整体变形耗能不如其他拼装位置的梁以及RC梁，考虑此工况的构件需采取合理的措施，提高其抗冲击能力；3）套筒灌浆饱满度对梁的抗冲击性能有影响较大，其决定PC梁的破坏形态以及刚度；4）拼装位置处交接面的边界条件是影响PC梁抗冲击性能数值分析是否准确的关键因素。
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| 关 键 词： | 装配式钢筋混凝土梁 落锤试验 冲击荷载 动力性能 灌浆套筒 |
| 收稿时间： | 2016-03-31 |
| 修稿时间： | 2016-07-10 |
STUDY ON THE BEHAVIOR OF PRECAST REINFORCED CONCRETE BEAMS UNDER IMPACT LOADING |
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| YAN Qiu-shi, SHAO Hui-fang, LI Liang. STUDY ON THE BEHAVIOR OF PRECAST REINFORCED CONCRETE BEAMS UNDER IMPACT LOADING[J]. Engineering Mechanics, 2017, 34(4): 196-205. DOI: 10.6052/j.issn.1000-4750.2016.03.0239 |
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| Authors: | YAN Qiu-shi SHAO Hui-fang LI Liang |
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| Affiliation: | The Key Laboratory of Urban Security and Disaster Engineering, Beijing University of Technology, Beijing 100124, China |
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| Abstract: | To study the impact-resistant behavior of precast reinforced concrete beams (PC beams), five PC beams and one reinforced concrete beam (RC beam) were tested under free-falling drop-weights. The effects of different assembly locations and grouted sleeve compactness on the impact-resistant behavior of PC beams were investigated. The crack patterns, impact forces, reaction forces, displacement and overall deformation energy dissipation of the specimens were described in detail. The results obtained are as follows: 1) the impact location, assembly position and impact loading affect the failure types of the specimens together. Under the impact loading, the longer distance between the assembly position and impact position, the more similar the mechanical performance, including the contact stiffness, integral stiffness and damage, is to that of the RC beam; 2) under the impact loading, when the assembly position and impact location are the same, the local damage and stiffness degradation of the PC beam are more serious, and its overall deformation energy dissipation is not as large as the PC beams with other assembly positions or the RC beam. In this case, it is necessary to take reasonable measures to improve its ability to resist shock; 3) the influence of sleeve grouting compactness on the mechanical properties of the PC beams is significant. It will also affect the damage form and stiffness of the PC beams; 4) the boundary conditions of the PC beams' assembly location is the key to affect the numerical analysis. |
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| Keywords: | PC beams drop-weight test impact loadings dynamic performance grouted sleeve |
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