Use of 3-Dimensional Nonlinear Response to Multi-Directional Ground Motions in Earthquake Resistant Design of Reinforced Concrete Frames

多向地面运动三维非线性响应在钢筋混凝土框架抗震设计中的应用

• 批准号: 61550402
• 负责人: SHIBATA Akenori
• 金额: $ 1.22万
• 依托单位: TOHOKU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1986
• 资助国家: 日本
• 起止时间: 1986 至 1987
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-61550402/
• 关键词: Reinfoced Concrete Frame; 3-Dimensional Earthquake Response; Multi-Axial Stress; Fiber Model; Irregular Shape of Building; ファイバーモデル; 不整形建物; 損傷分布; 弾塑性応答; セットバック建物; 2軸曲げ; 2方向地動

An analytical model of a reinforced concrete column, which has two sets of multiple rotational inelastic springs at the both ends of an elastic flexural rod, is newly developed to analyze the interaction effect of bi-axial bending. The results of 3-dimensional response analysis of one-story frame models subjected to bi-directional strong ground motions show that the damage to columns and the story response of the frames can be increased by the interaction effect of the bi-axial bending of columns.To investigate the effect of time-varying axial load in columns on the earthquake response of a building, a simplified SDOF model, which is equivalent to longitudinal frames of a eight-story reinforced concrete building and has fiber-slice models for columns in the first story, is analysed considering the time-varying axial load in columns induced by the overturning moment of the transverse frame. It is illustrated that the high level of variation of axial load may cause the increase in the damage and the reduction of the lateral strength of the columns.Three dimensional earthquake response of an eleven-story reinforced concrete building with a setback is analysed by the method considering the inelastic characteristics of the constituent member. The relationship of the distribution of the lateral strength of frames and the distribution of the damage to frames is investigate. It is shown that the strength distribution of frames based on the distribution of the shear forces of the frames by the static or dynamic linear analysis may lead to the uniform damage distribution.

建立了钢筋混凝土柱双向弯曲相互作用的分析模型，该模型在弹性弯曲杆的两端设置两组转动的多个非弹性弹簧。通过对单层框架模型在双向强地震动作用下的三维反应分析，发现柱的双向弯曲相互作用会增大柱的损伤和框架的层间反应，为了研究柱中时变轴力对结构地震反应的影响，建立了简化的单自由度模型，本文对一个等效于八层钢筋混凝土房屋纵向框架，第一层柱采用纤维条片模型的钢-混凝土组合框架进行了分析，考虑了由横向框架倾覆力矩引起的柱轴向荷载的时变。分析表明，轴力的大幅度变化会引起柱的破坏增大和柱的抗侧力降低.本文采用考虑构件弹塑性的方法，对一个十一层钢筋混凝土结构的三维地震反应进行了分析.研究了框架抗侧力分布与损伤分布的关系。结果表明，根据静力或动力线性分析得到的框架剪力分布来确定框架的强度分布，可以使损伤分布趋于均匀。

项目成果

SHIBATA,Akenori: "Inelastic earthquake response analysis of 3-D frames with consideration for biaxial bending interaction" The Architectural Reports of the Tohoku University. No. 26. 85-93 (1987)

Shibata、Akenori：“考虑双轴弯曲相互作用的 3-D 框架的非弹性地震响应分析”东北大学建筑报告。

SHIGA,Toshio: "Analysis of R.C. members subjected to biaxial bending by means of fiber model" Summaries of Tech. Papers of Annual Meeting, Architectural Inst. of Japan. C. 377-378 (1986)

SHIGA，Toshio：“通过纤维模型分析 R.C. 构件的双轴弯曲”技术摘要。

SHIGA, Toshio: "Inelastic and torsional earthquake response analysis of some model buildings with setbacks" Summaries of Tech. Papers of Annual Meeting, architectural Inst. of Japan. B. 725-726 (1986)

SHIGA，Toshio：“一些带有挫折的模型建筑的非弹性和扭转地震响应分析”技术摘要。

柴田明徳: 日本建築学会東北支部研究報告集. 48. 171-174 (1986)

Akinori Shibata：日本建筑学会东北分会研究报告集 48. 171-174 (1986)。

渋谷純一: 日本建築学会大会学術講演梗概集. 377-378 (1986)

Junichi Shibuya：日本建筑学会会议学术讲座摘要 377-378 (1986)。