Experimental study on seismic performance of seismic-damaged RC frames strengthened by different strengthening methods

Chu, Yunpeng; Zhong, Yan; Shi, Bixin; Gong, Yindong

doi:10.1016/j.istruc.2022.05.103

Cited by 6 publications

(2 citation statements)

References 23 publications

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“…The results explored that strengthening enhanced the ultimate strength and prevented brittle failure of the joint. Chu et al [15] et al studied the seismic behavior of damaged beam column joints strengthened with many techniques. The outcomes revealed that the addition of diagonal bars improved the joint shear strength.…”

Section: Introductionmentioning

confidence: 99%

Structural Behavior of Steel Reinforced Concrete Joint Under Flexural Loads

2023

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This research investigates the behavior of RC beam column joints reinforced with steel sections. The study deals with the strengthening of RC joints by different steel sections. The investigation included a theoretical analysis through a performing of simulation of beam-column joints laced with steel sections by using FEA. Implementation of the parametric study included reinforcing the concrete beam with steel sections in many configurations. Shapes and length were the most variables in this study, and many shapes were used, such as I-section, box section, and plates, beside the concrete compressive strength variable. The most recent study revealed the possibility of the method to enhance the efficiency of the joint in resisting the loads while the offering many additional features such as higher ductility, stiffness, and energy absorption. The results showed that strengthening by the steel section enhanced the flexural strength of the joint, but these enhancements were to a certain limit due to the concrete strength limitation. The ultimate strength enhancement was 49%, which is considered a good index for the joint efficiency. The use of compressive strength in small amounts led to the enhancements being limited due to the weakness of the concrete. Strengthening the flexural side of the beam by adding a steel section requires stronger concrete to provide more contribution for the steel section to resist more flexural loads. The increase in the compressive strength of the concrete made the improvements reach their peaks. Strengthening by I-shaped and box steel sections showed that the enhancement due to the existence of the I section was greater than that of the box one. Doi: 10.28991/CEJ-2023-09-03-015 Full Text: PDF

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Section: Introductionmentioning

confidence: 99%

Structural Behavior of Steel Reinforced Concrete Joint Under Flexural Loads

2023

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“…Geotechnics, a critical field in engineering, serves as the primary safeguard against infrastructural damage and ensures human safety [1,2]. Influential conditioning factors, such as lithology and the physical-mechanical properties of rocks and soils, coupled with triggering events like earthquakes and rainfall, directly impact the lifespan of structures [3].…”

Section: Introductionmentioning

confidence: 99%

Geotechnical Characterization for Territorial Planning of a Special Economic Zone at a University Campus in Ecuador

Carrión-Mero,

Solórzano,

Cabrera

et al. 2023

IJDNE

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Special Economic Zones (SEZs) facilitate heightened free trade logistics, enabling companies to expand their operations and product development within a nation. This study seeks to geomechanically characterise a pilot area within the Special Economic Zone Development Zone (ZEDE) at ESPOL Polytechnic University, Ecuador. The area has been marked by limited information concerning the geotechnical properties of the soil and rock formations. The goal of the study is to inform referential zoning for constructions, thereby fostering sustainable development of businesses and industries in the area. The methodology utilised in this study was threefold: (i) an inquiry into existing data and an on-site inspection, (ii) a geophysical campaign encompassing Vertical Electrical Soundings, seismic refraction, and geotechnical characterisation for result correlation, and (iii) an assessment of slope stability, on-site response spectrums, soil profile classifications, safety factors, and construction risk zoning. The study area, approximately 28 ha, was characterised by soils and rock formations, such as lapilli tuffs and tuffaceous shales, with resistive loads reaching up to 26.10 MPa. These geotechnical attributes permit the construction of structures exceeding four stories. The integration of geological and geotechnical data revealed that 75% of the study area presents low to medium construction risk related to instability, thereby indicating suitable areas for territorial planning. The methodology proposed in this study provides a replicable tool for application across the ZEDE, facilitating the creation of strategies for a land-use plan within an innovative university campus. Future large-scale studies could incorporate hydrogeological analysis, evaluation of environmental impact, and the development of mitigation plans for anthropogenic activities.

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