Displacement limits and performance displacement profiles in support of direct displacement-based seismic assessment of bridges

Many existing reinforced concrete buildings were designed in Southern European countries before the introduction of modern seismic codes and thus they are potentially vulnerable to earthquakes. Consequently, simplified methodologies for the seismic assessment and retrofitting of existing structures are required. In this study, a displacement based procedure using non-linear static analyses is applied to a four-storey RC frame in order to obtain an initial estimation of the overall inadequacy of the original structure as well as the extent of different retrofitting interventions. Accurate numerical models are developed to reproduce the seismic response of the RC frame in the original configuration. The effectiveness of three different retrofitting solutions countering structural deficiencies of the RC frame is examined through the displacement based approach. Non-linear dynamic analyses are performed to assess and compare the seismic response of the frame in the original and retrofitted configurations.

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Displacement-Based Seismic Assessment of Low-Height Confined Masonry Buildings

Earthquake Spectra ◽

10.1193/1.3111149 ◽

2009 ◽

Vol 25 (2) ◽

pp. 439-464 ◽

Cited By ~ 11

Author(s):

Amador Terán-Gilmore ◽

Oscar Zuñiga-Cuevas ◽

Jorge Ruiz-García

Keyword(s):

Pushover Analysis ◽

Relative Strength ◽

Seismic Assessment ◽

Shaking Table ◽

Evaluation Procedure ◽

Masonry Buildings ◽

Confined Masonry ◽

Shaking Table Testing ◽

Displacement Based ◽

Global And Local

This paper presents a practical displacement-based evaluation procedure for the seismic assessment of low-height regular confined masonry buildings. First, the so-called Coefficient Method established in several FEMA documents is adapted to obtain rapid estimates of inelastic roof displacement demands for regular confined masonry buildings. For that purpose, a statistical study of constant relative strength inelastic displacement ratios of single-degree-of-freedom systems representing confined masonry buildings is carried out. Second, a nonlinear simplified model is introduced to perform pushover analysis of regular confined masonry buildings whose global and local behavior is dominated by shear deformations in the masonry walls. The model, which can be applied through the use of commercial software, can be used to establish the capacity curve of such buildings. Finally, the evaluation procedure is applied to a three-story building tested at a shaking table testing facility.

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AN EQUIVALENT LINEARIZATION PROCEDURE FOR DISPLACEMENT-BASED SEISMIC ASSESSMENT OF VULNERABLE RC BUILDINGS

Nato Science Series: IV: Earth and Environmental Sciences - Advances in Earthquake Engineering for Urban Risk Reduction ◽

10.1007/1-4020-4571-9_5 ◽

2006 ◽

pp. 63-78 ◽

Cited By ~ 1

Author(s):

M. SELIM GUNAY ◽

HALUK SUCUOGLU

Keyword(s):

Seismic Assessment ◽

Equivalent Linearization ◽

Rc Buildings ◽

Displacement Based

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Simplified Data-Driven Model for the Moment Curvature of T-Shaped RC Shear Walls

Advances in Civil Engineering ◽

10.1155/2019/9897827 ◽

2019 ◽

Vol 2019 ◽

pp. 1-16 ◽

Cited By ~ 2

Author(s):

Bin Wang ◽

Wenzhe Cai ◽

Qingxuan Shi

Keyword(s):

Cross Sections ◽

Limit State ◽

Shear Walls ◽

Load Ratio ◽

Ultimate Limit State ◽

Limit States ◽

Displacement Ductility ◽

And Performance ◽

Displacement Based ◽

Ductility Capacity

Sectional deformation quantities, such as curvature and ductility, are of prime significance in the displacement-based seismic design and performance evaluation of structural members. However, few studies on the estimates of curvatures at different limit states have been performed on asymmetric flanged walls. In this paper, a parametric study was performed for a series of T-shaped wall cross-sections based on moment-curvature analyses. By investigating the effects of the axial load ratio, reinforcement content, material properties, and geometric parameters on curvatures at the yield and ultimate limit state, we interpret the variation in curvature with different influencing factors in detail according to the changes of the neutral axis depth. Based on the regression analyses of the numerical results of 4941 T-shaped cross-sections, simple expressions to estimate the yield curvature and ultimate curvature for asymmetric flanged walls are developed, and simplified estimates of the ductility capacity including curvature ductility and displacement ductility are further deduced. By comparing with the experimental results, we verify the accuracy of the proposed formulas. Such simple expressions will be valuable for the determination of the displacement response of asymmetric flanged reinforced concrete walls.

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