Reduction of seismic resiliency of RC structures caused by chloride corrosion for typical school buildings located in hot climates

Structures ◽  
2021 ◽  
Vol 34 ◽  
pp. 4060-4076
Author(s):  
Rana Hasanzadeh ◽  
Jamal Ahmadi ◽  
Mahdi Eghbali ◽  
Delbaz Samadian ◽  
Hamidreza Salmanmohajer
Keyword(s):  
School Buildings ◽  
Rc Structures ◽  
Chloride Corrosion ◽  
Typical School

scholarly journals Time Scale of Chloride-Induced Corrosion on Circular Section RC Linked Accelerated Test to Natural Corrosion

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Yue Zhang ◽  
Fangyan Lan ◽  
Mi Zhou ◽  
Ke Wang
Keyword(s):  
Time Scale ◽  
Time Correlation ◽  
Corrosion Process ◽  
Accelerated Corrosion ◽  
Circular Section ◽  
Rc Structures ◽  
Chloride Corrosion ◽  
Faraday’S Law ◽  
Chloride Environment ◽  
Natural Corrosion

The time scale in accelerated decay is essential for studying the durability of reinforced concrete (RC) structures exposed to the chloride corrosion environment. An accelerated corrosion test (ACT) was carried out on RC specimens were conducted under different chloride concentrations and applied voltages, with the information of steel measured. A novel prediction model of the complete corrosion process is proposed to evaluate the time correlation between accelerated decay and natural corrosion. The corrosion process of RC is divided into two stages: corrosion initial stage and corrosion stage of reinforcement. For the first stage, the coefficient of circular section members is presented. For the second stage, the accelerated factor of the test for the natural environment is proposed based on the Arrhenius-type and Faraday’s law. It is calculated by making regressions among some values of parameters, while moving to natural corrosion are extrapolating. The accelerating effect of applied voltages increases in the low-chloride environment, which is better than that in the high-chloride environment. This study provides calibration of the time scale for laboratory tests to analyze the performance of RC structures after corrosion.

Life-cycle cost analysis for an incremental seismic rehabilitation project

2021 ◽  
pp. 875529302110246
Author(s):  
Gustavo Loa ◽  
Alejandro Muñoz ◽  
Sandra Santa-Cruz
Keyword(s):  
Emergency Management ◽  
Life Cycle Cost ◽  
Economic Feasibility ◽  
Economic Losses ◽  
School Buildings ◽  
Life Cycle Cost Analysis ◽  
Costs And Benefits ◽  
Seismic Rehabilitation ◽  
Repair Costs ◽  
Typical School

Incremental seismic rehabilitation (ISR) consists of a set of discrete rehabilitation actions in order to decrease initial costs and to avoid long-lasting disruptions. Nevertheless, there are few cases of incrementally retrofitted buildings and few studies about its economic feasibility. The objective of this work is to evaluate the differences between incremental and single-stage rehabilitation in terms of economic losses during the building’s life span. For this purpose, this work analyzes three rehabilitation proposals to improve seismic performance of typical school buildings. Based on P58 FEMA (Federal Emergency Management Agency) methodology, expected repair costs and benefits were calculated for each rehabilitation intervention. Results confirm the potential of ISR for improving essential buildings.

Experimental Study on Lateral Strength Evaluation of Unreinforced Masonry-Infilled RC Frame

2016 ◽  
Vol 32 (3) ◽  
pp. 1725-1747 ◽  
Author(s):  
Kiwoong Jin ◽  
Ho Choi ◽  
Yoshiaki Nakano
Keyword(s):  
Compressive Strain ◽  
Concrete Block ◽  
Unreinforced Masonry ◽  
School Buildings ◽  
Rc Frame ◽  
Rc Frames ◽  
Equivalent Strut ◽  
Lateral Strength ◽  
Curvature Distribution ◽  
Typical School

In this study, RC frames with unreinforced masonry (URM) infill for typical school buildings in Korea are experimentally investigated to evaluate their seismic performance. For this purpose, one-bay, one-fourth scale specimens, with unreinforced concrete block (CB) infill having different boundary conditions due to beam rigidity, are tested under in-plane cyclic loading, using a distinctive measurement scheme consisting of three-axis strain gauges attached to all CB units. In this paper, the diagonal strut mechanism of CB infill including its main strut angle, average compressive strain, and equivalent strut width is discussed using principal compressive strains on CB units. The lateral strength carried by CB infill and RC frame from the overall response of the specimens is also explained, based on the compressive stress acting on the infill and the curvature distribution along RC members during the test.

Airborne Spore Exposure in Typical School Buildings

2009 ◽  
Vol 123 (2) ◽  
pp. S233-S233
Author(s):  
R. Perry ◽  
C. Barnes ◽  
K. Kennedy ◽  
L. Gard
Keyword(s):  
School Buildings ◽  
Typical School

Seismic Retrofit of a Typical School Building Using Column Jacketing and Supplement Beams

2014 ◽  
Vol 501-504 ◽  
pp. 1556-1559
Author(s):  
Chao Hsum Huang ◽  
Wei Chang ◽  
Shih Hua Liu
Keyword(s):  
Seismic Performance ◽  
Shear Walls ◽  
Department Of Education ◽  
School Buildings ◽  
School Building ◽  
Seismic Evaluation ◽  
Seismic Safety ◽  
Existing Building ◽  
Column Jacketing ◽  
Typical School

To ensure the safety of students during earthquakes, the Department of Education in Taiwan has been conducting a seismic evaluation and rehabilitation project on elementary and high-school buildings in recent years. In this project, column-jacketing is one of the most frequently used retrofit techniques due to its compatibility with existing building configurations. However, the seismic performance of column-jacketing often falls behind other retrofit techniques such as addition of shear walls. In order to enhance the seismic performance of column-jacketing, the addition of supplemental beams is proposed in this study. Analysis conducted on a typical school building based on nonlinear push-over analysis indicates that such addition could improve the seismic performance of column-jacketing for 38%, which would provide a great enhancement on the seismic safety of the retrofitted building.

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