Moment-curvature approach for blast analysis of RC frames with multitudinous members

Reinforced concrete (RC) frame structures with open first stories and masonry infill walls at the upper stories are very common in seismic areas. Under strong earthquakes, most of the energy dissipation demand imposed by the earthquake concentrates in the first story, and this eventually leads the building to collapse. A very efficient and cost-effective solution for the seismic upgrading of this type of structure consists of installing hysteretic dampers in the first story. This paper investigates the response of RC soft-story frames retrofitted with hysteretic dampers subjected to near-fault ground motions in terms of maximum displacements and lateral seismic forces and compares them with those obtained by far-field earthquakes. It is found that for similar levels of total seismic input energy, the maximum displacements in the first story caused by near-fault earthquakes are about 1.3 times larger than those under far-field earthquakes, while the maximum inter-story drift in the upper stories and the distribution and values of the lateral forces are scarcely affected. It is concluded that the maximum displacements can be easily predicted from the energy balance of the structure by using appropriate values for the parameter that reflects the influence of the impulsivity of the ground motion: the so-called equivalent number of cycles.

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Experimental and numerical investigation of new flexible connection elements between infill walls-RC frames

Construction and Building Materials ◽

10.1016/j.conbuildmat.2021.123605 ◽

2021 ◽

Vol 296 ◽

pp. 123605

Author(s):

M.M. Erdem ◽

E. Emsen ◽

M. Bikçe

Keyword(s):

Numerical Investigation ◽

Infill Walls ◽

Rc Frames

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Probability assessment of structural response modification factor of RC frames by the demand-capacity-factor method

Structures ◽

10.1016/j.istruc.2021.01.031 ◽

2021 ◽

Vol 30 ◽

pp. 628-637

Author(s):

Shuangshuang Cui ◽

Yan Chen ◽

Dagang Lu

Keyword(s):

Structural Response ◽

Capacity Factor ◽

Probability Assessment ◽

Response Modification Factor ◽

Factor Method ◽

Rc Frames ◽

Modification Factor

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Use of FRP for RC Frames in Seismic Zones: Part II. Performance of Steel-Free GFRP-Reinforced Beam-Column Joints

Applied Composite Materials ◽

10.1023/b:acma.0000035480.85721.b5 ◽

2004 ◽

Vol 11 (4) ◽

pp. 227-245 ◽

Cited By ~ 20

Author(s):

A. M. Said ◽

M. L. Nehdi

Keyword(s):

Seismic Zones ◽

Rc Frames

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A Displacement-Based Optimal Design Method of RC Frames Subjected to Minor Earthquakes

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.594-597.795 ◽

2012 ◽

Vol 594-597 ◽

pp. 795-799

Author(s):

Gui Tao Chen ◽

De Min Wei

Keyword(s):

Optimal Design ◽

Optimization Design ◽

Virtual Work ◽

Design Method ◽

Horizontal Displacement ◽

Target Displacement ◽

Programming Technique ◽

Direct Displacement Based Design ◽

Rc Frames ◽

Displacement Based

A displacement-based optimization design method of RC structure was proposed by combining direct displacement-based design method with nonlinear programming technique. To avert the influence of target displacement, the stationary constraint displacement was presented, and the target displacement can be updated during the optimal design process. Principle of virtual work and Gaussian integral method was employed to simplify the explicit relationship between horizontal displacement and the section dimension. Comparison analysis of the local optimal results corresponding to different displacement shapes was conducted to achieve global optimal design. The numerical tests presented demonstrate the computational advantages of the discussed methods and suggesting that the proposed method is a reliably and efficiently tool for displacement-based optimal design.

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Analysis of Seismic Performance of RC Frames with Centrally Reinforced Columns

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.671-674.1319 ◽

2013 ◽

Vol 671-674 ◽

pp. 1319-1323

Author(s):

Zi Xue Lei ◽

Yu Hang Han ◽

San Sheng Dong ◽

Jun Qing Guo

Keyword(s):

Seismic Performance ◽

Cross Sections ◽

Carrying Capacity ◽

Pushover Analysis ◽

Seismic Load ◽

Load Carrying Capacity ◽

Rc Columns ◽

Rc Column ◽

Rc Frames ◽

Load Carrying

A centrally reinforced column is a new type of RC columns, formed by providing a reinforcement skeleton at the central part of the cross section of an ordinary RC column. Tests have shown that as compared with an ordinary RC column, this type of columns has a higher load carrying capacity and ductility. From the pushover analysis of a frame composed of ordinary RC columns and one consisting of centrally reinforced columns, their seismic performance under seismic load of 9-degree intensity was studied according to Chinese code, including target displacements, story-level displacements, interstory drifts, appearance and development of plastic hinges. The results indicate that although the dimensions of cross sections of columns in the frame with centrally reinforced columns are smaller than those of the ordinary frame, the former still has a higher overall load carrying capacity and seismic performance than the latter.

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