A Review on Seismic and Progressive Collapse Evaluation of Reinforced Concrete Structure In-Filled with Masonry Infill Wall (original) (raw)
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SEISMIC VULNERABILITY ASSESSEMENT OF MASONRY INFILL REINFORCED CONCRETE FRAME STRUCTURES
In Pakistan most of the non-engineered buildings, like houses or small scale commercial centers are infilled with masonry but the behavior and interaction of masonry with rest of structure is not taken into account. During the massive 2005 earthquake, in Kashmir region of Pakistan, immense damage occurred due to masonry failure and caused a lot of life loss. A two storey reinforced concrete masonry infilled frame structure was modelled in DRAIN-3DX based on Finite Element Analysis (FEA) approach. FEA of infill frames includes modeling of beams, columns, and modeling of masonry infill. Masonry infill was modelled as strut subjected to compressional force and will unload inelastically after the removal of force.
Applied Sciences, 2021
On 16 April 2016, an earthquake of Mw 7.8 shook the coast of Ecuador, causing the destruction of buildings and a significant number of casualties. Following a visit by the authors to the city of Portoviejo during the debris removal and recovery stage, it was noted that several reinforced concrete buildings located on corners had collapsed in the central part of the city. These buildings were characterized by the presence of masonry at the edges of the buildings but not between the two mostly open-plan facades on the corner for practical reasons. This article reviews the effect of masonry infill panels on the seismic response of reinforced concrete structures. For this, a model that contains the geometric and mechanical characteristics typical of collapsed buildings was generated and subjected to nonlinear analysis, with both static and dynamic increments. The results show the clear influence of the masonry infill panels on the structural response through the torsional behavior that ...
Seismic Vulnerability of Masonry Infilled Reinforced Concrete Frames
This study assesses the seismic vulnerability of ductile reinforced concrete frames with masonry infill walls, utilizing nonlinear dynamic analysis of building models. The evaluation is based on structures designed and detailed according to Eurocodes. The research quantifies the effect of presence and configuration of masonry infill walls on the seismic collapse risk using Incremental Dynamic Analysis within the performance-based framework. Seismic vulnerability assessment indicated that of the configurations considered (bare, partially-infilled and fully-infilled frames), the fully-infilled frame had the lowest collapse risk and the bare frame is found to be the most vulnerable to earthquake-induced collapse.
Procedia Engineering
Cities located in regions of high seismic hazard throughout the World contain many RC resisting moment frames with infill-masonry (IM) walls that share common characteristics and seismic vulnerabilities. Recent seismic events and several researches demonstrated that the infill panels can influence the structural response and introduce brittle failure mechanism that can result on extensive damages or on the entire building collapse. Recent experimental studies reinforced the fact that the IM walls OOP capacity is affected by previous in-plane damage, which increase the seismic vulnerability of the panel and consequently of the global structure. Major earthquakes, considered 'mainshocks' (MS), are typically followed by smaller magnitude earthquakes known as 'aftershocks' (AS), which originate at or near the rupture zone of the larger earthquake. Foreshocks, which can be smaller than and precede the MS, also originate at or near the rupture. Thus, the main goal of this research is to evaluate the MS-AS effects on an eight storey RC building considering the IM walls combined inplane and OOP behaviour. The numerical model was subjected to several non-linear dynamic analyses and the results of the MS-AS consequences and the effect of the IM walls will be evaluated in terms of maximum inter-storey drift for the different levels of peak ground accelerations.
Effect of partial infill walls on collapse behavior of reinforced concrete frames
Engineering Structures, 2019
The main objective of the study is to investigate the effect of partial infill walls on collapse mechanism of reinforced concrete (RC) frames using finite element models and experimental data. The modeling methods are described in detail and are validated by quasi-static experiments conducted on two RC frame specimens with and without partial infill walls under column removal scenarios. Parametric analyses are performed to investigate the effects of partial infill wall type, dimensions of the opening, and strength of the mortar joints and masonry. The numerical results show that different infill wall configurations have distinct influence on the collapse behavior of RC frames in terms of load distribution, resistance force and failure mode. The infill parts surrounding the opening significantly influence the applied vertical load in the compressive stage, and the infill parts on both sides of the opening influence the flexural response of beams in damaged bays. The increases of the strength of bed joints and masonry are shown to increase the applied vertical load. Finally, a simplified analytical method is proposed to efficiently estimate the collapse resistance force of RC frames with different types of partial infill walls in order to facilitate the structural engineers.
Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN 2015), 2019
Past and more recent seismic events worldwide clearly showed that a crucial issue for lifesafety and loss reduction due to earthquakes for existing reinforced concrete (RC) buildings is related to the out-of-plane (OOP) collapse of infill masonry walls. In literature, few studies addressed this paramount topic, above all about the proposal of strengthening strategies to prevent the infills' collapse. This paper presents an experimental work about the assessment of possible strengthening solutions designed to mitigate or prevent the out-of-plane collapse of masonry infills in existing RC buildings. Three nominally identical full-scale one-bay-one-story RC frames were built and infilled with a thin masonry wall made up of horizontal hollow clay bricks. The first specimen was representative of the enclosure of a typical existing RC building in the Mediterranean region in its "as-built" condition. The remaining two specimens were strengthened against the out-of-plane collapse by means of two different strengthening techniques based on the application of innovative systems made up of high-ductility mortar plaster and fibre-reinforced polymer nets. All the tests consisted in the application of a semi-cyclic (loading-unloading-reloading) history of imposed displacements in the OOP direction by means of small pneumatic jacks through a uniform distributed load. Experimental results are shown in terms of OOP force-displacement responses, deformed shapes and damage evolution. In the end, the results of the tests are compared to assess the effectiveness of the selected strengthening techniques and to provide a support towards the choice of the best strategies for future further investigations and applications.
Effect of Infill Walls on Response of Multi Storey Reinforced Concrete Structure
—The present research work investigates the seismic response of reinforced concrete (RC) frame building considering the effect of modeling masonry infill (MI) walls. The seismic behavior of a residential 6-storey RC frame building, considering and ignoring the effect of masonry, is numerically investigated using response spectrum (RS) analysis. The considered herein building is designed as a moment resisting frame (MRF) system following the Egyptian code (EC) requirements. Two developed models in terms of bare frame and infill walls frame are used in the study. Equivalent diagonal strut methodology is used to represent the behavior of infill walls, whilst the well-known software package ETABS is used for implementing all frame models and performing the analysis. The results of the numerical simulations such as base shear, displacements, and internal forces for the bare frame as well as the infill wall frame are presented in a comparative way. The results of the study indicate that the interaction between infill walls and frames significantly change the responses of buildings during earthquakes compared to the results of bare frame building model. Specifically, the seismic analysis of RC bare frame structure leads to underestimation of base shear and consequently damage or even collapse of buildings may occur under strong shakings. On the other hand, considering infill walls significantly decrease the peak floor displacements and drifts in both X and Y-directions.
Progressive collapse analysis of an RC building with exterior partially infilled walls
The Structural Design of Tall and Special Buildings, 2013
Exterior partially infi lled walls of RC condominium buildings are often monolithically cast with beams and/or columns in Taiwan. In practice, they are regarded as non-structural elements in usual structural design, and only their weight is conservatively considered. In this study, effects of three common types of exterior partially infi lled walls on the progressive collapse potential of an RC building are investigated. Linear and nonlinear static analyses under different column-loss scenarios are carried out. Analysis results indicate that infl uence of the partially infi lled walls differs from each type. Changes in the demand-tocapacity ratios indicate that without considering the walls, the moment demand of beams may be overestimated. However, their shear demand may be underestimated, especially with the panel-type walls. Meanwhile, they may increase the collapse resistance of the building frame under column loss but with decreased ductility capacity. From the structural aspect, with a constant opening rate of 60%, the wing-type wall is a better option than the parapet-and panel-type walls. The panel-type wall appears to be the worst choice since shear failure of their connected beam members may be induced.
IJERT-Seismic Analysis of Reinforced Concrete Frame Building with Infill Wall using ETABS
International Journal of Engineering Research and Technology (IJERT), 2021
https://www.ijert.org/seismic-analysis-of-reinforced-concrete-frame-building-with-infill-wall-using-etabs https://www.ijert.org/research/seismic-analysis-of-reinforced-concrete-frame-building-with-infill-wall-using-etabs-IJERTV10IS050381.pdf Reinforced concrete frame building with masonry infill wall is a common construction practice in developing countries like India. Infill walls serve as partitions in buildings. Infill walls are typically considered as nonstructural elements and its strength and stiffness is not considered in the general design; such an approach may lead to unsafe design. This paper focuses on the study of the effect of masonry infill wall on RC frame building. Response Spectrum Method is used for analysis purpose. The analysis is done on ETABS software and the results are discussed.
Masonry infill walls are mainly used to increase initial stiffness and strength of reinforced concrete (RC) frame buildings .It is mainly considered as a non-structural element. In many cities of India, it is very common to leave the first storey of masonry infilled reinforcement concrete (RC) frame building open preliminary to generate parking space or any other purposes (Ex-Reception lobbies). This Open First storey is also termed as " Soft Storey ". The upper storeys have brick infilled wall panels with various opening percentage in it. These types of buildings are highly undesirable in seismically active areas because various vertical irregularities are created in such buildings which have consistently performed very poor behaviour during past earthquake. Therefore it is important to take immediate measures to prevent the indiscriminate use of soft first storeys in buildings, which are designed without regard to the increased displacement and force demands in the first storey columns. The current study investigates the seismic response of reinforced concrete moment resisting-frame multi-story buildings with soft storey or open storey located at different levels with and without opening and designed according to the IS code. Building models are bare frame, infilled frame with soft storey at GL, FF and TF and infilled frame with soft storey at three different levels along with 10% and 30% centre and corner openings. Infill panel effect is induced in the structure by using Equivalent Diagonal strut method. This research made an attempt to strengthen the soft storey by different methods. Thus linear static analysis is to be carried out on the models by using computer software ETABS from which different parameters are computed.