STRUCTURAL PERFORMANCE EVALUATION OF R/C EXTERIOR/PARTITION FLAT WALLS MONOLITHICALLY CONSTRUCTED IN MOMENT RESISTING FRAMES
STRUCTURAL PERFORMANCE EVALUATION OF R/C EXTERIOR/PARTITION FLAT WALLS MONOLITHICALLY CONSTRUCTED IN MOMENT RESISTING FRAMES
复制标题
抗力矩框架中整体构造的 R/C 外墙/隔断平板墙的结构性能评估
DOI：
10.3130/aijs.80.1145
复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Yousok Kim
中科院分区：
文献类型：
--
作者：
Yuto Ojio;Y. Sanada;Yousok Kim
2011年日本东北太平洋沿岸的地震严重破坏了混凝土建筑的外墙/隔墙。外墙/隔墙的损坏严重妨碍了混凝土建筑物的立即入住。虽然这种类型的墙通常被认为是非结构墙，但由于其与结构部件的整体连接，它似乎潜在地影响了整体建筑的抗震性能和行为。因此，本文通过实验和分析方法研究了典型平壁的基本行为和性能。本文主要研究了2011年日本东北太平洋沿岸地震中受损的钢筋混凝土（SRC）住宅建筑。宽度约为1米的外墙与结构梁整体相连，在地震中严重受损。设计、制作和测试了一个1/2.5比例的单舱框架模型，该模型部分代表了建筑物的第10层。通过测量每根柱的剪力和轴力，获得了平墙对整体性能/行为的贡献。整体试件在平壁剪切破坏下形成梁屈服机制。试件因梁纵筋屈曲而劣化。最大剪切力为87千牛，约占总强度的三分之一，由平墙维持到剪切破坏，这意味着这种类型的墙对于设计漂移水平下建筑物的抗震性能/行为不一定可以忽略不计。如此高的贡献归因于其非线性轴向伸长造成的被动压缩。另一方面，剪切破坏后阻力完全丧失。采用几种宏观模型对实验结果进行了数值模拟。特别地，平壁被三种类型的宏观模型所取代：Case 1a， Case 1b和Case 2。病例1a和病例1b采用多弹簧（MS）模型。只考虑案例1b的抗剪强度劣化。另一方面，案例2采用等参数单元（IPE）模型，考虑轴-弯-剪行为相互作用。因此，案例1b和案例2成功地模拟了整个试件和平壁面的实验侧力-层间漂移角关系。除案例1a外，其余均为平墙抗剪强度下降。然而，由于模型只考虑轴-弯-剪行为相互作用，因此只有Case 2可以评估平墙剪切破坏时轴向阻力的损失。
Exterior/partition flat walls monolithically constructed in concrete buildings were severely damaged by the 2011 earthquake off the Pacific coast of Tohoku, Japan. Damage to exterior/partition flat walls significantly prevented concrete buildings from immediate occupancy. Although this type of wall is commonly regarded as non-structural wall, it seems to potentially affect the seismic performance and behavior of overall buildings because of its monolithic connection to structural components. Therefore, this paper investigates fundamental behavior and performance of a typical flat wall through experimental and analytical approaches. This paper focuses on a steel reinforced concrete (SRC) residential building that was damaged by the 2011 earthquake off the Pacific coast of Tohoku. Exterior flat walls with the width of approximately 1 m were monolithically connected to structural beams and significantly damaged during the earthquake. A 1/2.5 scale one-bay frame model partially representing the 10th story of the building was designed, fabricated, and tested under static cyclic loads. Contributions of the flat wall to the overall performance/behavior were obtained by measuring shear and axial forces of each column. A beam yielding mechanism was formed in the overall specimen with a shear failure of the flat wall. The specimen deteriorated with buckling of beam longitudinal rebars. The maximum shear force of 87 kN, which corresponded to approximately one-third of the overall strength, was sustained by the flat wall until the shear failure, which means that this type of wall is not necessarily negligible for the seismic performance/behavior of buildings at design drift levels. Such high contribution of the flat wall attributed a passive compression caused by its nonlinear axial elongation. On the other hand, the resistance was completely lost after the shear failure. Experimental results were simulated by numerical analyses using several macro models. In particular, the flat wall was replaced by three types of macro models: Case 1a, Case 1b, and Case 2. Multi Spring (MS) model was used for Case 1a and Case 1b. Shear strength deterioration was considered only for Case 1b. On the other hand, Isoparametric Element (IPE) model was used for Case 2 which considered the axial-flexural-shear behavior interactions. Consequently, Case 1b and Case 2 successfully simulated the experimental lateral force-story drift angle relationship for the overall specimen as well as flat wall. Shear strength drop of the flat wall was represented except for Case 1a. However, only Case 2 could evaluate the loss of axial resistance with shear failure of the flat wall, because the axial-flexural-shear behavior interactions were considered only for the model.