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Design and experimental study on RC modular superimposed shear wall boundary elements with new inter-module connections

Abstract

Connections between modules affects the overall stability, reliability, and safety of modular buildings. However, connecting techniques for high-rise reinforced concrete (RC) modular buildings are rare, and the seismic requirements for confining the boundary elements of RC modular shear walls are technically challenging. In this study, a new RC modular superimposed shear wall (RC-M-SSW) structural system was developed for the fast construction of high-rise buildings. An innovative double U-shaped connector (DUSC) was proposed to connect stirrup segments embedded in adjacent module walls to form closed stirrups. To clarify the confinement mechanism of the connected stirrups, nine superimposed boundary element (SBE) columns with different DUSC dimensions and a cast-in-place (CIP) column were designed and axially tested. The results showed that the SBE specimens failed mainly in a ductile manner with higher stiffness and load carrying capacity compared to the CIP column. The effectiveness of the DUSC-based connection was demonstrated to be reliable by the strain analysis. To simplify the production of the connectors, an configuration optimized DUSC was proposed. Besides, the 8 mm-thick steel plates were recommended for the manufacturing of the DUSCs, and the design implications for ensuring the confinement performance of the TSPs were provided.

article Article

date_range 2024

language English

link Link of the paper

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Bai Jiulin

Yang Biao

Xie Bin

Yang Jingwei

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Featured Keywords

Modular building

Precast concrete structure

Superimposed shear wall

Boundary element

Horizontal connection

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Effect of corrosion on flexural strength of reinforced concrete beams with polypropylene fibers

Abstract

An experimental study was performed to investigate the effects of polypropylene fibers on uncorroded and corroded reinforced concrete beams. Three different volume fractions of polypropylene fibers having 0, 0.5, and 1.5%, were tested at four corrosion levels of 0% and approximately 5, 7, and 9%. A full scale of an accelerated corrosion pool was used for the accelerated corrosion process. Reinforced concrete beams were used for an under monotonic bending test. The contribution of the actual corrosion levels of transverse and longitudinal reinforcement bars to the total corrosion levels were obtained from reinforcement bars fully extracted from concrete. Flexural strength, bond-slip, and moment-curvature relationships were examined for uncorroded and corroded reinforced concrete beams. A new model was developed to predict the flexural strength of corroded reinforced concrete beams. The proposed model for predicting the residual flexural strength of corroded beams was compared with test data published in previous studies. Furthermore, a novel model is presented for improved predictions between the actual and theoretically estimated corrosion mass losses, based on Faraday’s law, with the aid of fully extracted reinforcement bars. The model used to predict the flexural strength of corroded reinforced concrete beams with large sizes demonstrated good agreement with current and previously published literature data. In the case of corroded beams comprising differing amounts of polypropylene fibers, the performance of the corroded beams was limited by a fiber volume fraction of 1.5% at low corrosion levels.

article Article

date_range 2018

language English

link Link of the paper

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