Liu Wenchao, Cao Wanlin, Zhang Jianwei, Qiao Qiyun, Ma Heng
College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China.
Materials (Basel). 2016 Mar 2;9(3):148. doi: 10.3390/ma9030148.
The seismic performance of recycled aggregate concrete (RAC) composite shear walls with different expandable polystyrene (EPS) configurations was investigated. Six concrete shear walls were designed and tested under cyclic loading to evaluate the effect of fine RAC in designing earthquake-resistant structures. Three of the six specimens were used to construct mid-rise walls with a shear-span ratio of 1.5, and the other three specimens were used to construct low-rise walls with a shear-span ratio of 0.8. The mid-rise and low-rise shear walls consisted of an ordinary recycled concrete shear wall, a composite wall with fine aggregate concrete (FAC) protective layer (EPS modules as the external insulation layer), and a composite wall with sandwiched EPS modules as the insulation layer. Several parameters obtained from the experimental results were compared and analyzed, including the load-bearing capacity, stiffness, ductility, energy dissipation, and failure characteristics of the specimens. The calculation formula of load-bearing capacity was obtained by considering the effect of FAC on composite shear walls as the protective layer. The damage process of the specimen was simulated using the ABAQUS Software, and the results agreed quite well with those obtained from the experiments. The results show that the seismic resistance behavior of the EPS module composite for shear walls performed better than ordinary recycled concrete for shear walls. Shear walls with sandwiched EPS modules had a better seismic performance than those with EPS modules lying outside. Although the FAC protective layer slightly improved the seismic performance of the structure, it undoubtedly slowed down the speed of crack formation and the stiffness degradation of the walls.
研究了不同聚苯乙烯泡沫塑料（EPS）配置的再生骨料混凝土（RAC）组合剪力墙的抗震性能。设计并测试了6片混凝土剪力墙在循环荷载作用下的性能，以评估细再生骨料混凝土在抗震结构设计中的作用。6个试件中的3个用于建造剪跨比为1.5的中高层建筑剪力墙，另外3个试件用于建造剪跨比为0.8的低层建筑剪力墙。中高层和低层剪力墙分别由普通再生混凝土剪力墙、带有细骨料混凝土（FAC）保护层（EPS模块作为外保温层）的组合墙以及带有夹心EPS模块作为保温层的组合墙组成。对试验结果得到的几个参数进行了比较和分析，包括试件的承载能力、刚度、延性、耗能和破坏特征。考虑FAC作为保护层对组合剪力墙的影响，得到了承载能力的计算公式。利用ABAQUS软件模拟了试件的损伤过程，结果与试验结果吻合较好。结果表明，EPS模块组合剪力墙的抗震性能优于普通再生混凝土剪力墙。带有夹心EPS模块的剪力墙比EPS模块位于外侧的剪力墙具有更好的抗震性能。虽然FAC保护层略微提高了结构的抗震性能，但无疑减缓了墙体裂缝形成的速度和刚度退化。
