Response of RC Buildings With Weak Beam-Column Joints Subjected To Different Types of Ground Motions


Abstract eng:
The seismic assessment of older-generation reinforced concrete buildings is of great concern because they constitute the bulk of the building stock in earthquake prone areas in many countries. Previous research has revealed that reasonable estimates for the structural response are obtained through the use of current analytical tools, though local deformation parameters are more difficult to pinpoint in such response estimates. However, the behavior of beam-column connections has usually been ignored in modeling process due to its complexity. This study investigates the contribution of joint flexibility to the lateral response of reinforced concrete buildings subjected to different types of ground motions and emphasizes the significance of modeling properly unreinforced beam-column joints. Here, the beam-column connections without transverse reinforcement are referred to as unreinforced joints. Nonlinear dynamic analyses of a prototype building frame are performed through two analytical models with rigid and flexible beam-column joints. The analytical models are identical to those previously used by the authors in simulation of reinforced concrete frames tested on shake tables. In these models, joint flexibility is simulated through joint rotational springs. These inelastic rotational springs simulate shear deformation at the joint and member-end rotations due to bond-slip behavior. The hysteretic behavior of the rotational spring is represented by a multilinear hysteretic material (Pinching4) available in OpenSees. Variation in the response of selected building is studied under different types of ground motions representative of large magnitude-large distance and large magnitude-short distance records. The selected response quantities for the considered reinforced concrete structure are the global response quantities such as roof displacement, distribution of the story drifts along the height of the structure, and local response quantity such as joint rotation. Results of the analyses are discussed in comparative fashion for the two analytical models subjected to different types of ground motions. It is shown that computations must take into account the role played by joint deformations in case of RC buildings having unreinforced beam-column joints.

Contributors:
Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
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Text je chráněný podle autorského zákona č. 121/2000 Sb.



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 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 391.:
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