Experimental Evaluation of Reinforced Concrete Frames with Unreinforced Masonry Infills under Monotonic and Cyclic Loadi
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RESEARCH PAPER
Experimental Evaluation of Reinforced Concrete Frames with Unreinforced Masonry Infills under Monotonic and Cyclic Loadings Tze Che Van1 • Tze Liang Lau1 Received: 10 May 2020 / Revised: 23 September 2020 / Accepted: 28 September 2020 Ó Iran University of Science and Technology 2020
Abstract Despite numerous studies on seismic performance of masonry infilled reinforced concrete frames have been conducted, experimental study on effect of type of lateral load on masonry infilled reinforced concrete frames is sparse. This paper investigates the seismic performance of masonry infilled reinforced concrete frames with different aspect ratios subjected to monotonic and cyclic loadings. Six half-scale, single-storey, single-bay frame specimens designed according to code provisions commonly adopted in Malaysia were tested. Behaviours of frames were assessed based on observed failure modes, strength, stiffness, ductility and energy dissipation capacity. Experimental result reveals that typical infilled frame in Malaysia has high tendency to fail under shear on columns. Type of loading does not affect strength of both bare frames and infilled frames. However, the drift to reach peak strength drops about 40–52% for infilled frames subjected to cyclic loading as compared to monotonic loading. Initial stiffness of infilled frames is found elevated with slower stiffness degradation under the influence of cyclic loading. Ductility of infilled frames subjected to cyclic loading is 48% higher than those subjected to monotonic loading, regardless of aspect ratio. A total of 84% increase in energy dissipation is observed with 60% of increment in bay length. Keywords Infilled frame Reinforced concrete Seismic response Unreinforced masonry Monotonic loading Cyclic loading
1 Introduction The art of building with bricks and mortar is one of the oldest construction practices, which dated back to a few thousand years ago, that are still being widely adopted in all parts of the world nowadays. Many residential houses, office buildings and public structures are constructed with reinforced concrete frames infilled with unreinforced masonry. Unreinforced masonry wall usually serves as architectural partition and many other service functions. In Malaysia, masonry infills using clay bricks, engineering
& Tze Liang Lau [email protected] Tze Che Van [email protected] 1
School of Civil Engineering, Universiti Sains Malaysia, 14300 Pulau Pinang, Malaysia
bricks, sand-lime bricks and concrete bricks were extensively used in building construction since 1970s [1]. The most common type of masonry system in Malaysia is confined masonry, which involves the construction of masonry infill after erection of structural frames. Due to the complex behaviour and interaction between masonry infills with its surrounding frame, many opt to treat masonry infills as non-structural element and do not take their effects into consideration during design and analysis. The fact that regarding mas
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