Effects of Hardening and Deteriorating Properties of Members on Collapse Behavior of Building Structures

构件硬化和劣化性能对建筑结构倒塌行为的影响

• 批准号: 07455220
• 负责人: UETANI Koji
• 金额: $ 3.71万
• 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-07455220/
• 关键词: Collapse Behavior; Symmetry Limit; Steady-State limit; Brittle Fracture; Weak-beam Frame; Local Buckling; Stability problem; Seismic Response Analysis; 硬化特性; 耐震設計; 有限要素法; 劣化特性; 梁降伏型多層骨組; 動的繰り返し載荷

The purpose of this project is to clarify the collapse behavior of building frames and to develop the design criteria for preventing the frames from falling into collapse under strong earthquake. The following results have been obtained in this project.(1) Accurate dynamic response analyzes have been carried out for more realistic frame models which have a mass at every floor. It has been revealed that there exists deformation concentration phenomena in the process of dynamic collapse, which is characterized by the growth of bow-shaped deflection mode and the concentration of this mode in the restricted lower region. And the method have been proposed for predicting the height of the deformation concentration region.(2) An unknown type of collapse behavior have been revealed for multistory weak-beam planar frames which consists of deteriorating members and subjected to a severe earthquake. It has been shown that the height of the deformation concentration region can be predicted by an e … More xtended version of the method developed in previous studies (1). The validity of the method is verfied through numerical response analyzes. The effects of the deteriorating properties of members on the dynamic collapse behavior are then clarified by investigating the collapse behaviors of several frames wiht different negative stiffnesses after reaching the maximum strengths.(3) New criteria for preventing multistroy frames from severe collapse with an accelerative growth of the particular mode deflection during strong earthquake ground motion has been proposed. Criteria for suppressing the sway drift has also been proposed to meet higher-level safety requirements.(4) Existence of growth phenomena of the bow-shaped mode and its characteristics have been revealed by experimental study using shaking table for weak-beam-type frame models. The drift of the sway-mode vibration center has also been clarified.(5) Seismic response analyzes, considering the effects of brittle fractures at beam-ends during an earthquake excitation, have been carried out for steel frames. The response properties have been compared to those of ductile frames and the effects of fractures on the seismic response of steel frames are discussed. Less

本计画的目的在于厘清建筑物框架结构的倒塌行为，并发展出防止框架结构在强震下倒塌的设计准则。本项目取得了以下成果。(1)精确的动态响应分析已经进行了更现实的框架模型，有一个质量在每一层。结果表明，在动力失稳过程中存在着变形集中现象，其特征是弓形偏转模态的增长，并集中在受限制的下部区域。提出了预测变形集中区高度的方法。(2)研究表明，在强烈地震作用下，由劣化构件组成的多层弱梁平面框架会发生未知类型的倒塌。结果表明，变形集中区的高度可以用一个简单的经验公式来预测 ...更多信息 在以前的研究中开发的方法的扩展版本（1）。通过数值响应分析验证了该方法的有效性。通过对几个具有不同负刚度的框架在达到最大强度后的动力倒塌行为的研究，阐明了构件性能恶化对动力倒塌行为的影响。(3)本文提出了在强震作用下多层框架结构在振型加速增长的情况下防止严重倒塌的新判据。还提出了抑制摇摆漂移的标准，以满足更高级别的安全要求。(4)通过对弱梁式框架模型的振动台试验研究，揭示了弓形振型增长现象的存在及其特征。还澄清了摆动模态振动中心的漂移。(5)考虑地震作用下梁端脆性断裂的影响，对钢框架进行了地震反应分析。与延性框架的地震反应特性进行了比较，并讨论了断裂对钢框架地震反应的影响。少

项目成果

上谷宏二、他: "動的外乱に対する設計の展望 第2章5-4" 日本建築学会, (1996)

Koji Uetani 等人：“动态扰动设计展望第 2 5-4 章”日本建筑研究所，（1996 年）

Koji Uetani, Hiroshi Tagawa: "Deformation concentration phenomena in seismic response of multistory frames" Proceedings of 11th World Conference on Earthquake Engineering. Paper No.567. (1996)

Koji Uetani、Hiroshi Takawa：“多层框架地震响应中的变形集中现象”第 11 届世界地震工程学会论文集。

Koji Uetani, Hiroshi Tagawa: "Seismic Response of Steel Frames Including Brittle Fractures at Beam-ends" J.Struct. Construction Engng (Trans.of Architectural Institute of Japan). 489 (in Japanese). 77-86 (1996)

Koji Uetani、Hiroshi Takawa：“包括梁端脆性断裂在内的钢框架的地震响应”J.Struct。

上谷宏二: "動的外乱に対する設計の展望:第2章5-4" 日本建築学会, (1996)

Koji Uetani：“动态干扰设计的观点：第 2 章 5-4”，日本建筑学院，（1996 年）

Koji Uetani, Hiroshi Tagawa: "Effects of strain softening on dynamic collapse behavior of multistory frames" Proc.of 5th Plasticity. 479-482 (1995)

Koji Uetani、Hiroshi Takawa：“应变软化对多层框架动态倒塌行为的影响”Proc.of 5th Plasticity。