ABSTRACT

Recent Japanese earthquakes have severely damaged the nonstructural walls of many buildings. While nonstructural walls do not influence the seismic performance of a building, this damage can still sometimes cause buildings to be demolished or render their continued use impossible. Therefore, it is important that seismic designs take the seismic properties of nonstructural walls into consideration. Shear loading tests and FE analysis were conducted to investigate this phenomenon, which showed that shear strength decreased and crack width increased with wider rebar spacing. The FE analysis indicated that the discrete crack model evaluated the test results more adequately than the smeared crack model. In addition, the stress distribution was localized with wider rebar spacing. Therefore, it is thought that the shear strength decreased. Finally, a simple crack width prediction method was proposed. With this method, the rebar strain was calculated using the horizontal deformation of the walls. Using this method, the crack width could be reasonably estimated. It is believed that these findings will be useful for designing nonstructural walls with improved seismic performance.

摘要

最近的日本地震严重破坏了许多建筑物的非结构墙。虽然非结构墙不会影响建筑物的抗震性能，但这种损坏有时仍会导致建筑物被拆除或使其无法继续使用。因此，抗震设计必须考虑非结构墙的抗震特性。进行了剪切载荷试验和有限元分析来研究这种现象，结果表明，随着钢筋间距的增加，剪切强度降低，裂缝宽度增加。有限元分析表明，离散裂纹模型比涂抹裂纹模型更充分地评估了测试结果。此外，应力分布以更宽的钢筋间距进行局部化。因此，认为剪切强度降低。最后，提出了一种简单的裂缝宽度预测方法。使用这种方法，钢筋应变是使用墙的水平变形来计算的。使用这种方法，可以合理地估计裂缝宽度。相信这些发现将有助于设计具有改进抗震性能的非结构墙体。