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钢结构 2018年第9期33卷 110-110页

中国钢结构协会结构稳定与疲劳分会＂第16届（ISSF—2018）学术交流会暨教学研讨会＂于2018年8月25—28日在山东省青岛市隆重召开,本次会议由中国钢结构协会结构稳定与疲劳分会主办,山东科技大学、青岛理工大学、山东大学联合承办,青岛... 详细信息

中国钢结构协会结构稳定与疲劳分会＂第16届（ISSF—2018）学术交流会暨教学研讨会＂于2018年8月25—28日在山东省青岛市隆重召开,本次会议由中国钢结构协会结构稳定与疲劳分会主办,山东科技大学、青岛理工大学、山东大学联合承办,青岛九屋建筑安装有限公司、青岛义和钢构有限公司、烟台新天地试验技术有限公司协办。来自全国各地钢结构领域94家单位的220位专家、学者以及来自39所大学的170名研究生出席了这次规模空前的盛会。

关键词：中国钢结构协会山东科技大学信息结构稳定教学研讨会学术交流会青岛市山东大学

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Story-based Elastic-plastic Stability Coefficient of Frames

Story-based Elastic-plastic Stability Coefficient of Frames

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中国钢结构协会结构稳定与疲劳分会2006年学术交流会暨钢结构教学研讨会

作者： TONG Genshu, XING Guoran (Department of Civil Engineering, Zhejiang University, Hangzhou, Zhejiang, P.R.China, 310027)

The traditional and modified effective length methods are reviewed, and the limitations in the application of modified effective length approach are outlined. Based on the story buckling approach of frames, a universal slenderness and story stability coefficient for a frame story are defined. A large number of frames are analyzed to acquire their limit loads using ANSYS. Residual stresses and initial geometrical imperfections are considered. The limit loads are correlated with the universal slenderness. It is found that when the universal slenderness is intermediate, there exists an unfavorable interaction between sway buckling and non-sway buckling of frames. A reduction factor of ultimate load capacity is introduced to consider the buckling interaction, and formulae according to the column curves in the Code GB50017 are suggested to predict the story stability coefficient.

关键词： Frame Buckling Stability coefficient Interaction Elastic-plastic analysis

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Experimental Research on Seismic Behavior of New Concrete-filled Square Steel Tube and Steel Beam Joints under Cyclic Loading

Experimental Research on Seismic Behavior of New Concrete-fi...

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中国钢结构协会结构稳定与疲劳分会2006年学术交流会暨钢结构教学研讨会

作者： WANG Lai, LI Nan, ZHOU Nannan (Shandong University of Science and Technology, Qingdao, Shandong, P.R.China, 266510)

A new type of joint between Concrete-filled Square Steel Tube column and H-type steel beam is proposed in the paper, and the seismic behavior of this type of joint under low-reversed cyclic loading test is researched. Ductility behavior, dissipation of seismic energy, degeneration of intensity and stiffness of the joint between Concrete-filled Square Steel Tube columns and steel beam under low-frequency, horizontal, repeat load are analyzed. Hysteretic curves to these four joint specimens between displacement and repeat load, together with corresponding framework curve is shown.

关键词： Concrete-filled Square Steel Tubular joints with outer diaphragms hysteretic curve seismic behavior.

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Seismic Response Analysis of Adding Extra-floors by Spanning Existing Building with Steel Structure

Seismic Response Analysis of Adding Extra-floors by Spanning...

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中国钢结构协会结构稳定与疲劳分会2006年学术交流会暨钢结构教学研讨会

作者： WANG Yuanqing, SONG Feng, SHI Yongjiu, SHI Gang (Department of Civil Engineering, The Key Laboratory of Structure Engineering and Vibration of Ministry of Education, Tsinghua University, Beijing, P.R.China, 100084)

The technique of adding extra-floors by spanning existing building with steel structure is deeply researched and widely applied in engineering practice in recent years. The lateral rigidity of this type of buildings is irregular, so it is necessary to conduct the seismic response. But the dynamic characteristics and the seismic responses of this type of building systems is deficiently analyzed. In this paper, the dynamic characteristics of this type of buildings are analyzed through three-dimensional models, and the seismic responses of the separated and integral coat framing are obtained by using the response spectrum method and the time history analysis method according to the code for seismic design of building and based on two study cases. Through the analysis and comparison of the computational results, it is proved that for this type of buildings the seismic response analysis under the design earthquake and the strong earthquake must be conducted.

关键词： Adding extra-floors by spanning existing building seismic response response spectrum method time history analysis method

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Determination of Buckling Mode for Braced Elastic-plastic Frames

Determination of Buckling Mode for Braced Elastic-plastic Fr...

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中国钢结构协会结构稳定与疲劳分会2006年学术交流会暨钢结构教学研讨会

作者： TONG Genshu, XING Guoran (Department of Civil Engineering, Zhejiang University, Hangzhou, Zhejiang, P.R. China, 310027)

The instability of braced frames was studied by geometric and material nonlinear analysis accounting for residual stresses, initial sway imperfection and member initial bow. The change of buckling mode with increasing of bracing stiffness was analyzed and relationship between the ultimate load capacity and the bracing rigidity was achieved. The threshold stiffness of the bracing just enough to make frames buckle in a non-sway mode was obtained. Horizontal loads produce stresses in the bracings, and thus make the bracings yield prematurely and result in decrease of bracing stiffness. This will change the buckling mode of the braced frame. Nonlinear analysis of braced frames loaded both vertically and horizontally was also made. A simple and easy-to-use criterion was established for judging the buckling mode of braced frames including the effect of the horizontal loads. The proposed equation was compared with FEM analysis.

关键词： braced frame, elastic-plastic stability, threshold bracing stiffness

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Three-dimensional Finite Element Modeling of Cold-formed Steel Beam-to-column Bolted Connections

Three-dimensional Finite Element Modeling of Cold-formed Ste...

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中国钢结构协会结构稳定与疲劳分会2006年学术交流会暨钢结构教学研讨会

作者： WANG Fei*, CUI Jia, LONG Liping (College of Civil Engineering, Chongqing University, Chongqing, P.R.China, 400045)

This paper presents a three-dimensional finite element analysis of cold-formed steel bolted moment connections. The analysis results were calibrated against test results, and comparisons for moment-rotation curves showed satisfactory agreement. Four finite element models of full-scaled connections were generated including material nonlinearities, geometrical nonlinearities, large displacement and contact effects. Three failure modes of connection were recognized and demonstrated: bearing failure, lateral flexural-torsional failure and flexural failure. Two parameters are introduced to evaluate the performance and efficiency of moment resisting of connection. Structural behavior of bolted moment connection is validated. However, it is unexpectedly found that large bolt pitch causes high bearing stress which leads to ineffectiveness of moment resisting.

关键词： cold-formed steel moment connection finite element failure modes contact element rotational center

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Static Strength of N-joints of Square Chords with Circle Braces

Static Strength of N-joints of Square Chords with Circle Bra...

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中国钢结构协会结构稳定与疲劳分会2006年学术交流会暨钢结构教学研讨会

作者： SHU Xingping1, ZHU Zhengrong1, WANG Yuanqing2 (1: College of Civil Engineering, Hunan University, Changsha, Hunan, P.R.China, 410082 2:Department of Civil Engineering, Tsinghua University, Beijing, P.R.China, 100084)

Full-scale tests on two overlapped N-joints square chords and circle braces under the axial compression of branch and chord were carried out. The failure mode of modelⅠwas branch local buckling failure at joint, and the failure mode of modelⅡwas the failure combining the web of chords local buckling with the flag of chords local buckling The calculation suggests that the ratio of the test value of modelⅠto the result of code design formulae bearing capacity is 0.73 , and to the finite element analysis is 1.11;the ratio of the test value of modelⅡto the result of code design formulae bearing capacity is 0.99 , and to the finite element analysis is 1.02. Our research indicates that the axial compression of chords has a great influence on the ultimate bearing resistance,and the result gained from the code design formulae leans to be unsafe because the influence of the axial compression of chords is not taken into account.

关键词： square chords and circle braces joints, full-scale experiment, code design formulae

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搅拌摩擦焊接6061-T6铝合金对接接头力学性能研究

搅拌摩擦焊接6061-T6铝合金对接接头力学性能研究

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中国钢结构协会结构稳定与疲劳分会第18届（ISSF-2024）学术交流会暨教学研讨会

作者：欧阳元文李贝贝王元清贺鹏程刘小蔚李志强上海通正铝结构建设科技有限公司合肥工业大学土木工程结构与材料安徽省重点实验室清华大学土木工程安全与耐久教育部重点实验室

为了优化搅拌摩擦焊接(FSW)6061-T6铝合金对接接头的焊接参数并研究其力学性能,针对5mm、8mm、12mm和16mm厚度的挤压型铝合金板件,采用不同的搅拌头转速、焊接速度和搅拌头类型进行了46组焊接试验,进行了152次狗骨型平板试样的单调拉伸... 详细信息

为了优化搅拌摩擦焊接(FSW)6061-T6铝合金对接接头的焊接参数并研究其力学性能,针对5mm、8mm、12mm和16mm厚度的挤压型铝合金板件,采用不同的搅拌头转速、焊接速度和搅拌头类型进行了46组焊接试验,进行了152次狗骨型平板试样的单调拉伸试验。研究结果表明,在最优焊接参数下,搅拌摩擦焊接铝合金接头强度均高于中国和欧洲铝合金规范中规定的熔化焊接接头强度。与现有的应力-应变本构模型相比,提出的三阶段Ramberg-Osgood模型能够准确的预测焊接接头的应力-应变关系曲线。

关键词： 6061-T6铝合金搅拌摩擦焊应力-应变关系焊接参数

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Simplified Design Method of Space Frames Using Second-order Elastic Analysis

Simplified Design Method of Space Frames Using Second-order ...

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中国钢结构协会结构稳定与疲劳分会2006年学术交流会暨钢结构教学研讨会

作者： SHU Xingping, LU Beirong, SHEN Pusheng (Steel Structure Institute of Hunan University, Changsha, Hunan, P.R.China, 410082)

Based on the finite-deformation theory of nonlinear continuum mechanics, this paper derived the non-linear stiffness equation of the space steel frames for the accurate second-order elastic analysis. According to the code for design of steel frames, a simplified second-order elastic design method of space steel frames was proposed, and its analytical results were compared with those of the accurate second-order elastic method. Taking a three-story and single-bay frame as a numerical example, we analyzed and calculated its behavior under three kinds of load combinations. The analysis and calculation showed that the method could be used to calculate not only the main directional second-order moment, shear force and second-order axial force but also the horizontal displacement of multiplayer frames, and the error analysis verified that the method was reliable and could help engineers in structural design.

关键词： space steel frames nonlinear continuum mechanics second-order elastic analysis simplified design method

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Study on Dynamic Performance of Fish-bellied Flexible Supporting System for Point Supported Glass Building

Study on Dynamic Performance of Fish-bellied Flexible Suppor...

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中国钢结构协会结构稳定与疲劳分会2006年学术交流会暨钢结构教学研讨会

作者： WANG Yuanqing, WU Lili, REN Zhihong, SHI Yongjiu, LI Shaofu (Institute of glass and metal structure for architectures, The Key Laboratory of Structure Engineering and Vibration of Ministry of Education, Tsinghua University, Beijing , P.R.China, 100084)

Fish bellied supporting system is a kind of supporting systems for point supported glass facades, which is popular with architects and widely used in many public buildings. Yet systematic research on its dynamic behaviors still leaves much to be desired. Dynamic properties including influence of concentrative glass mass, wind and seismic responses of two types of fish bellied supporting systems are investigated herein. It is concluded that natural frequencies of vibration decrease apparently with the increasing concentrative mass, and the system becomes more flexible. The rise-to-span ratio and pretension in cables have more effects on frequencies of high order. Concentrative mass, pretension and rise-to-span ratio have great impacts on performance of the systems under wind loads. The node displacement and cable stress caused by earthquake is smaller than those caused by wind vibration. Earthquake has less effect on the fish bellied supporting flexible system.

关键词： flexible supporting system, fish bellied system, dynamic properties, wind-reducing response, seismic response

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