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Damage Localization of Long-span Spatial Lattice Structures

Damage Localization of Long-span Spatial Lattice Structures

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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： DING Yang, ZHANG Jiwei, LI Zhongxian (School of Civil Engineering, Tianjin University, Tianjin, P.R.China, 300072)

In this paper, based on the mode curvature method and the artificial neural network technology, a new method for damage localization for long-span spatial lattice structures is introduced. Through the investigation and comparison, the parameters suitable for the damage localization of the long-span spatial lattice structures are determined, and the different damage cases for a long-span cantilever tubular truss structure of the stadium in Tianjin Olympic Sport Center are numerically simulated to verify the applicability and effectiveness of the established damage localization method.

关键词： long-span spatial structures lattice structure damage identification damage localization mode curvature artificial neural network (ANN)

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The Performance of the Tension Region of the Box-Column and H Beam Joint and Nonlinear Finite Element Method Analysis

The Performance of the Tension Region of the Box-Column and ...

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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： LENG Gang, CUI Jia, YUAN Zhengqiang (College of Civil Engineering, Chongqing University, Chongqing, P.R.China, 400045)

The performance of the box-column(without stiffing plates inside) and H beam joint at the tension region of the beam flange was first *** the simplified model for analysis was established and twenty models were analysed with the nonlinear finite element *** the impact of the width of the beam flange,the thickness of the column flange and the axial load ratio of the column on the behavior of the joint were also discussed. Finally,the ruling condition of the load-carrying capacity of the joint was established,according to which the formula to calculate the bearing capacity of the joint was suggested and the results from the suggested formula and FEM analysis were compared.

关键词： box-column beam-column joint the tension region of the beam flange nonlinear FEM analysis

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New Model for Second Order Elastic-plastic Analysis of Steel Frames with Semi-rigid Connections

New Model for Second Order Elastic-plastic Analysis of Steel...

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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： HU Xibing, SHEN Pusheng, SHU Xingping (College of Civil Engineering, Hunan University, Changsha, Hunan, P.R.China, 410082)

A new model for the second order elastic-plastic analysis of plane steel structures was presented by replacing the general element with a new one, which has two rotational springs at its ends. Revising its rotation displacement equation, the second order elastic-plastic stiffness matrix of this kind of structure was derived. And the second order elastic-plastic program of this structure was worked out. Three steel frames were calculated with this program. The calculation results show that this model is reliable and fit to the analysis of all plane steel structures.

关键词： steel structures, new model, second order elastic-plastic analysis, rotational spring

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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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Study on the Ultimate Bearing Capacity of Shale Ceramisite Concrete Filled Steel Tubular Short Columns

Study on the Ultimate Bearing Capacity of Shale Ceramisite C...

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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： MA Jiansuo 1, CAI Huanqin 2 (1: Department of Civil Engineering , Hebei Institute of Architecture & Civil Engineering, Zhangjiakou,, Hebei, P.R.China, 075000 2: Zhangjiakou No.1 Construction Engineering Co.Ltd, Zhangjiakou, Hebei, P.R.China, 075000)

On the basis of uniaxial compression tests on 18 short column specimens, the ultimate bearing capacity of shale ceramisite concrete filled steel tubular short column is analyzed. The results have been compared with common concrete filled steel tubular columns. The ultimate bearing capacity formula of shale ceramisite concrete filled steel tubular short columns is derived by the limit equilibrium method. According to the good agreement between the calculated results and experimental data, reference can be proposed for the engineering application of the lightweight concrete.

关键词： shale ceramisite concrete concrete filled steel tubular short columns ultimate bearing capacity

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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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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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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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