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.

本文通过对钢筋混凝土空心墩的试验和分析，阐明了其在复合荷载作用下的基本受力性能。1.钢筋混凝土空心梁的极限位移小于同尺寸的填充梁，其位移和耗能能力均低于填充梁。在极限状态下，耗能能力比填充梁低20%左右。空心梁在达到峰值强度后，其强度衰减较快。2.空心截面翼缘处存在较多的弯曲裂纹。一旦这些裂纹发展到腹板部分，它们就变成剪切裂纹。这一现象不仅发生在剪切破坏试样中，而且发生在弯曲破坏试样中。这就是为什么当采用空心截面时，需要仔细考虑其抗剪强度的空心截面腹板宽度较窄的原因。3.桥墩位移的弯剪分离试验结果表明，即使弯曲破坏占主导地位，随着循环荷载的增大，剪切的影响也会增大。因此，在分析钢筋混凝土空心墩时，仅考虑受弯承载力的分析是有局限性的，必须将受剪承载力与受弯承载力结合起来考虑。4.在高轴压作用下，荷载-位移曲线表明，由于钢筋屈曲和保护层混凝土剥落，空心墩的位移承载力有变差的趋势。由此可见，提高空心墩的抗剪配筋率等构造措施对提高空心墩在高轴压作用下的位移承载力具有重要意义。

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: "Damage of Bridges and Retrofit" Journal of Japan Society for Safety Engineering. Vol.34. 425-435 (1995)

Hirokazu Iemura：“桥梁损坏与改造”日本安全工程学会杂志。