[1] Design and Analysis of Steel Structures

2020-10-15 Hits:

• A nonlinear dynamic analysis method of steel frame - bracing system was established based on the Force Analogy Method. By simplifying the axial buckling deformation into local deformation mechanism, an efficient nonlinear analysis method of steel frame-bracing system under static and dynamic loads is presented. (Detailed introduction: Nonlinear Dynamic Analysis Method of structure- Force Analogy Method)

A series of studies have been carried out on the low-ductility steel-concentrically braced frame (CBF). The ASCE7-10 stipulates that "for a steel frame concentrically braced structure system, the strength reduction factor R = 3 can be designed in a medium intensity area and without any special construction measures to ensure structural ductility. The structure of the steel-concentrically steel frame system is low ductility structure, can not be compared with the general steel structure, influence of bracing failure on structure and how to rationalize the design, etc. have yet to be further studied and interpreted. In view of the system. The concept of CBF structure reserves is put forward,decoupling strength and stiffness, two basic seismic design parameters, including the stiffness ratio and the strength ratio between the reaction frame and the bracing , are defined. The ductility demand spectrum of the structural system under different reserve capacities is established. The effects of different strength reduction factors, different site classes and gravity second-order effect on the dynamic response of CBF system are presented. The range of parameters and the relevant design parameters of the anti-collapse of steel frame-brace structure under earthquake are given, ensure that the CBF system can remain elastic under small earthquake and not collapse under the action of large earthquakes, and the reserve system of the frame will be brought into full play.Based on the above research. The incremental dynamic analysis of the steel frame-supporting structure system is carried out, the collapse ductility spectrum of CBF system is proposed, the ductility demand spectrum and the collapse ductility spectrum are combined to determine the critical period of the structure under different design parameters, and vulnerability analysis of the CBF system is carried out, and the existing research results are verified.

    Fig.1 Schematic diagram of force-deformation relationship of steel concentrically-braced frame

Thesis

 

[1] Li G.,Fahnestock L. A. Seismic response of single-degree-of-freedom systems representing low-ductility steel concentrically-braced frames with reserve capacity[J].Journal of Structural Engineering, 2013, 139(2): 199-211.

[2] Li G.,Fahnestock L. A.,Li H.-N. Simulation of Steel Brace Hysteretic Response Using the Force Analogy Method[J].Journal of Structural Engineering, 2013, 139(4): 526-536.

[3] Li G.,Dong Z. Q.,Li H. N.,Yang Y. B. Seismic Collapse Analysis of Concentrically-Braced Frames by the IDA Method[J]. Advanced Steel Construction. (Accepted)

[4] Dong Z.-Q.,Li G.,Li H.-N. Parametric study of multi-degree-of-freedom steel concentrically braced frame based on Pushover analysis [C]. International Conference on Civil and Environmental Engineering, ICCEE, Sep. 23-24, 2014. Busan, Koera.

[5] Dong Z. Q.,Li G.,Li H. N. Parameters Study of Steel Concentrically-Braced Frames Using IDA[C]. Applied Mechanics and Materials, 2013, 351-352: 223-226.

[6]张伟莉,李钢.多层钢框架结构强度折减系数研究[J].建筑钢结构进展, 2013, 15(5): 21-28.

[7]董志骞,李钢,李宏男.基于延性需求的钢框架-中心支撑体系参数研究[J].地震工程与工程振动, 2014, 34(3): 84-94.

[8]董志骞,李钢,李宏男.基于IDA的钢框架-中心支撑体系参数研究[C].第23届全国结构工程学术会议, 2014. 兰州, 中国.

[9]张伟莉.多层钢框架结构强度折减系数研究[D].大连理工大学硕士学位论文,2013.

[10]董志骞.基于延性需求的钢框架-中心支撑体系参数研究[D].大连理工大学硕士学位论文,2014.

[11]莫德秀.自复位钢框架结构抗震性能分析[D]. 大连: 大连理工大学硕士学位论文, 2014.

Patent

 

[1] 李钢, 张宇, 李宏男. 中国发明专利，ZL201310666973.4，框架-支撑摇摆跨结构体系.