Dynamic Ultimate Bahavier of Reinforced Concrete Hollow Pier under Combined Loads

组合荷载下钢筋混凝土空心墩的动力极限力

• 批准号: 07455181
• 负责人: IEMURA Hirokazu
• 金额: $ 4.86万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07455181/
• 关键词: High Pier; Hollow Section; Reinforced Concrete; Shear Failure; Flexural Failure; Model Experiment; Ultimate Strength; Energy Dissipation; ひび割れ進展

This research presents results from testing and analysis of RC hollow piers to clarify their fundamental behavior under combined loads.1.The ultimate displacement of RC hollow beams are smaller than the same-size filled beam, and the capacity of displacement and energy dissipation tend to be lower than that. At the ultimate state, the energy dissipation is about 20% inferior to the filled beam. After the hollow beam reaches the peak strength, the deterioration of its strength is rapid.2.In the flange part of a hollow section there are many flexural cracks. Once these cracks develop into the web part, they are turned into shear cracks. This phenomenon occurs not only in case of shear failure specimen but flexural failure specimen. This is why the narrow width of the web of the hollow section requires careful consideration on its shear strength, when hollow section is adopted.3.The experimental result of separation of pier displacement into flexural and shear components shows that the influence of shear is increasing when the cyclic load becomes larger even if the flexural failure dominates. This leads to the conclusion that the analysis that deals with only flexural behavior has the limitation when we analyze RC hollow piers, so the shear behavior must be considered in cojunction with flexural behavior.4.When high axial loading is used, the load-displacement curve shows that the displacement capacity tends to become worse because of the rebar buckling and the spalling of cover concrete. From this it follows that inprovement of structural details, such as increasing the shear reinforcement ratio, is important to enhance the displacement capacity of hollow piers under high axial load.

这项研究提出了对RC空心码头的测试和分析，以阐明其在联合负载下的基本行为。1。RC空心梁的最终位移小于同一尺寸的填充光束，并且位移和能量耗散的能力往往趋于比那低。在最终状态下，能量耗散约20％以下。空心梁达到峰值强度后，其强度的恶化是迅速的。2。在空心截面的法兰部分中，有许多弯曲裂纹。一旦这些裂缝发展到网络部分，它们就会变成剪切裂纹。这种现象不仅发生在剪切衰竭样本的情况下，而且发生弯曲故障标本。这就是为什么采用空心部分时需要仔细考虑其剪切强度的狭窄宽度。3。将码头位移分为弯曲和剪切组件的实验结果表明，剪切的影响正在增加即使弯曲故障占主导地位，循环载荷也会更大。这得出了这样的结论，即仅处理弯曲行为的分析在分析RC空心码头时具有限制，因此必须与弯曲行为同时考虑剪切行为。曲线表明，由于钢筋屈曲和覆盖混凝土的剥落，位移能力往往会变得更糟。因此，因此，结构细节的不合格（例如增加剪切钢筋）对于增强高轴向载荷下空心墩的位移能力很重要。

项目成果

家村浩和: "中空断面RC部材のせん断挙動に関する解析" 土木学会年次学術講演概要集. 第5部. 960-961 (1995)

Hirokazu Iemura：“空心截面 RC 构件的剪切行为分析”日本土木工程师学会年度学术讲座摘要第 5 部分。960-961 (1995)。

家村浩和: "中空断面RC梁部材の正負交番荷重下における曲げせん断特性" 土木学会年次学術講演概要集. 第5部. 830-831 (1995)

Hirokazu Iemura：“正负交替荷载下空心截面 RC 梁构件的弯曲剪切性能”日本土木工程师学会年度学术讲座摘要第 5 部分。830-831 (1995)。

家村浩和: "複合力が作用するRC柱部材の修正圧縮場理論によるせん断解析" 土木学会 年次学術講演概要集. 第5部. 760-761 (1996)

Hirokazu Iemura：“基于受复杂力作用的 RC 柱构件的修正压缩场理论的剪切分析”日本土木工程师学会年度学术讲座摘要第 5 部分。760-761 (1996)。

井上晋: "Flexural and Shear Behavier of Reinforced Concrete Hollow Beams under Reversed Cyclic Loads" Proc. of 11th World Conference in Earthquake Engineering. Paper No. 1359. (1996)

Susumu Inoue：“反向循环荷载下钢筋混凝土空心梁的弯曲和剪切行为”第 11 届世界地震工程会议论文第 1359 号。（1996 年）

Hirokazu Iemura: "Shear Analysis of RC Hollow Beams" Proc.of the 50th Annual Conference of JSCE. Vol.5. 960-961 (1995)

Hirokazu Iemura：“RC 空心梁的剪切分析”，JSCE 第 50 届年会论文集。