Effects of interface slip and semi-rigid joint on elastic seismic response of steel-concrete composite frames

Abstract

The stiffness matrix of semi-rigidly connected composite beams considering interface slip was established and the calculation method for elastic seismic response of composite frame was derived. The corresponding calculation programs were developed. Introducing the dimensionless quantities that were related to the connector shearing stiffness and the joint rotation stiffness, the influences of interface slip and semi-rigid joint on composite frame were transferred to quantitative parameter analysis, taking account of cross sectional properties, materials and linear stiffness of composite beam synthetically. Based on the calculation programs, free vibration frequencies and seismic responses of semi-rigid joint steel-concrete composite frame considering interface slip were calculated. The influences of interface slip and semi rigid joint on dynamic characteristics and seismic response were analyzed and the seismic design advices were presented. The results show that the interface slip decreases the free vibration frequencies and increase the seismic responses of composite frame. The semi-rigid joint reduces the free vibration frequencies and increases seismic responses of composite frame compared with rigid joint. With the increase of joint rotational stiffness, the elastic seismic responses of composite frame increase firstly and then decrease. The effects are related to the ratio of joint rotation stiffness to linear stiffness of composite beam.

Keywords

composite frame / interface slip / semi-rigid joint / dynamic characteristic / shearing stiffness / rotation stiffness / seismic response

References

[1] ElghazouliA. Y., CastroJ. M., IzzuddinB. A.. Seismic performance of composite moment-resisting frames [J]. Engineering Structure, 2008, 30: 1802-1819

[2] LeonR. T.. Analysis and design problems for PR composite frames subjected to seismic loads [J]. Engineering Structure, 1998, 20: 364-371

[3] PilusoV., RizzanoG., ToloneI.. Seismic reliability assessment of a two-story steel-concrete composite frame designed according to Eurocode 8 [J]. Structural Safety, 2009, 31(5): 383-395

[4] JiangL.-z., CaoH., YuZ.-wu.. Elastic-plastic earthquake response of steel-concrete composite frame structure [J]. Journal of Railway Science and Engineering, 2005, 2(3): 1-8

[5] JiangL.-z., WangChen.. Elastic-plastic earthquake response of steel-concrete composite frame structure [J]. Journal of Railway Science and Engineering, 2008, 5(2): 7-11

[6] ZongZ.-h., LinD.-x., FangZ.-z., QiuF.-wei.. Experimental research on seismic behavior of a two-story concrete filled steel tubular composite frame [J]. Journal of Building Structures, 2002, 23(2): 27-35

[7] ShiQ.-y., ZhangK.-q., BaiG.-liang.. The experimental study of the behavior of the two-lay three-story composite frame composed of steel beams and steel concrete columns under cyclic-loading [J]. Journal of Shaanxi Institute of Technology, 1996, 12(3): 50-57

[8] LiT. Q., MooreD. B., NethercotD. A., ChooB. S.. The experimental behavior of a full-scale, semi-rigidly connected composite frame: overall considerations [J]. Journal of Constructional Steel Research, 1996, 39: 167-191

[9] WongY. L., YuT., ChanS. L.. A simplified analytical method for unbraced composite frames with semi-rigid connections [J]. Journal of Constructional Steel Research, 2007, 63: 961-969

[10] WangJ. F., LiG. Q.. A practical design method for semi-rigid composite frames under vertical loads [J]. Journal of Constructional Steel Research, 2008, 64: 176-189

[11] WangJ. F., LiG. Q.. Testing of semi-rigid steel-concrete composite frames subjected to vertical loads [J]. Engineering Structures, 2007, 29: 1903-1916

[12] AyoubA.. A force-based model for composite steel-concrete beams with partial interaction [J]. Journal of Constructional Steel Research, 2005, 61: 387-414

[13] RanziG., ZonaA.. A steel-concrete composite beam model with partial interaction including the shear deformability of the steel component [J]. Engineering Structures, 2007, 29: 3026-3041

[14] NieJ. G., CaiC. S. M., AsceP. E.. Steel-concrete composite beams considering shear slip effects [J]. Journal of Structural Engineering, 2003, 129(4): 495-506

[15] LiG.-q., ZhaoXin.. A finite element model of partial composite girders [J]. Chinese Quarterly of Mechanics, 2006, 27(3): 454-462

[16] LiG.-q., ShenZ.-yan.Elastic and elastic-plastic analysis and computation theory of steel frame system [M], 2006, Shanghai, Shanghai Scientific and Technical Press: 7-201

[17] ShiW.-long.Experimental and theoretical study on semi-rigid beam-to-column composite joints with flush end-plate connection [D], 2006, Shanghai, Tongji University: 11-184

[18] HuD.-z., LiG.-q., SunF.-fei.. Practical analysis of natural periods for semi-rigidly connected multi-story composite frames [J]. World Earthquake Engineering, 2008, 24(2): 68-73