scholarly journals Effect of Infill Wall on Vertical Irregular Tall Structure

2019 ◽  
Vol 9 (1) ◽  
pp. 1488-1495
Keyword(s):  
Reinforced Concrete ◽  
Response Spectrum ◽  
Frame Structure ◽  
Seismic Load ◽  
Base Shear ◽  
Reinforced Concrete Frame ◽  
Infill Wall ◽  
Soft Storey ◽  
Infilled Frame ◽  
Tall Structure

In reinforced concrete (RC) frames, the masonry infill walls are used to fill the gaps between the two columns and one horizontal beam which form the single bay. Stiffness of this bay or reinforced concrete frame structure increases by filling the gap between the bays of a structure. The present study investigates that the influence of the infill wall in the vertical irregular tall structure with bottom soft storey and the behavior of (G+14) storey building subjected to seismic load. The study carries different type of models which are regular frame, regular full infilled frame, regular infilled with 15% central opening frame and regular infilled with 15% corner opening frame are analysed. Similarly the same study has been extended for vertical irregular bare frame, inverted vertical irregular bare frame. This study is made for a case applicable to earthquake zone (III), soil type (II) with importance factor (1) and M20 grade of concrete. The analysis is performed using the equivalent static method and response spectrum method as per IS 1893-2016 using E-Tabs 2015 commercially available software. The parameters considered for study are storey displacement, storey drift and base shear. The results obtained for storey displacement and storey drift, in the infilled frame are reduced due to presence of infill wall. However, as expected, the base shear is increased from bare frame to infilled frame.

scholarly journals PERILAKU LATERAL SIKLIK PORTAL BETON BERTULANG BERISI DINDING BATA MERAH

2018 ◽  
Vol 1 (4) ◽  
pp. 845-856
Author(s):  
Mutia Intan Sari ◽  
Abdullah Abdullah ◽  
Mochammad Afifuddin
Keyword(s):  
Reinforced Concrete ◽  
Brick Masonry ◽  
Experimental Result ◽  
Wall Material ◽  
Base Shear ◽  
Reinforced Concrete Frame ◽  
Infill Wall ◽  
Concrete Frame ◽  
Cyclic Loading Tests ◽  
Masonry Infill Wall

Abstract: Generally, brick masonry is used as infill wall material for houses and buildings. The Infill wall is installed once the structure is constructed, and assumed as the dead load for the structure. In fact, infill wall may contribute significant stiffness to the structure. As a consequent, the structure may develop such higher base shear forces due to the large stiffness of the structure. The purpose of this research is to evaluate the behavior of the reinforced concrete frame specimen with red brick infill wall and the specimen without using any infill wall. The size of the frame specimen is 2350 x 3300 mm, which consists of reinforced concrete bare frame specimen and reinforced concrete frame specimen with brick masonry infill wall. Cyclic loading tests were conducted on the specimens on the top beam of frame by in-plane direction. The displacement loading protocol are performed laterally and determined by the measured maximum of LVDT from the beam-column connection. Based on the experimental result, the increase capacity and the obtained energy dissipation of the infill wall frame specimen is up to 11.65 and 3.54 higher respectively, compared to the bare frame specimen. The decrease of the stiffness and the ductility level of the infill wall specimen is lesser in comparison with the bare frame specimen. The typical failure mechanism of the infill wall specimens is diagonal cracking. Abstrak: Material bahan bangunan pengisi dinding untuk pembangunan rumah tinggal dan gedung umumnya menggunakan bata merah. Dinding pengisi dipasang apabila struktur utama selesai dikerjakan dan dianggap sebagai beban mati. Namun pada kenyataannya struktur bangunan yang memiliki dinding mempunyai kekakuan struktur yang besar. Ditinjau dari aspek kegempaan, struktur bangunan dengan kekakuan yang besar maka semakin besar pula beban gempa yang bekerja. Tujuan dari penelitian ini menganalisis perilaku portal beton bertulang dengan dinding bata merah yang dibandingkan dengan portal beton bertulang tanpa dinding. Pengujian yang dilakukan adalah portal beton bertulang dengan ukuran 2350 × 3300 mm berjumlah 2 sampel yaitu: portal tanpa dinding dan portal berdinding bata merah dengan plasteran. Pengujian portal dilakukan dengan beban lateral siklik dengan arah pembebanan sejajar bidang balok (in plane) pada balok bagian atas portal. Mekanisme pembebanan dilakukan dengan kontrol beban yang ditentukan oleh perpindahan maksimum yang terukur dari LVDT dari join kolom-balok. Hasil penelitian ini menunjukkan terjadinya peningkatan kapasitas dan energi disipasi sebesar 11,65 kali dan 3,54 kali dari portal tanpa dinding. Penurunan kekakuan dan daktilitas yang terjadi lebih kecil dari portal tanpa dinding. Pola kehancuran yang terjadi pada portal berisi dinding bata merah yaitu jenis diagonal cracking

scholarly journals PERKUATAN SEISMIK STRUKTUR RANGKA BETON BERTULANG MENGGUNAKAN BREISING BAJA TIPE X DAN V TERBALIK

2016 ◽  
Author(s):  
Made Sukrawa ◽  
Ida Bagus Dharma Giri ◽  
I Putu Deskarta ◽  
Made Hendra Prayoga
Keyword(s):  
Reinforced Concrete ◽  
Seismic Retrofitting ◽  
Frame Structure ◽  
Seismic Load ◽  
Reinforced Concrete Structure ◽  
Reinforced Concrete Frame ◽  
Braced Frame ◽  
Concrete Frame ◽  
Conventional Analysis ◽  
Brace Frames

Abstract: Analysis of reinforced concrete frame with steel braces has been done to compare the behavior of the open frame structure with reinforced concrete structure with steel braces. Three models of 2D open frame structure with 3, 4 and 5 floors were made and analyzed in SAP2000 v17 with intermediate detailing according to Indonesian Codes for Seismic Load (SNI 1726: 2002). 3-span frame structure with a span length of 6 m and level height of 3,5 m were designed according to SNI 1726: 2002, and then re-analyzed with special detailing according to New Indonesian Codes for Seismic Load (SNI 1726: 2012). After that, it was added with braces as seismic retrofitting. Two types of braces (X and concentric inverted V) were used in this study and analyzed with conventional analysis and stage construction analysis according to their stages of implementation. From the analysis results, several structure components that analyzed according to SNI 1726:2012 provitions were experience over-stressed. After retrofitted with steel braces, those components fulfill strength provition according to SNI 2847:2013 about structural concrete regulations for buildings. In addition to that, displacements that occurs on braced frame are smaller than displacements of the open frame structure with ratio of 0.08, 0.12, and 0.18 for X-brace frames with 3,4, and 5 storey and 0.07, 0.11, and 0.16 for inverted-V brace. With staged construction analysis, displacements of  X-braced frame structure increased by 14.38%, 13.62%, and 9.98% from the conventional analysis results for structure with 3, 4,and 5 storey. For structure with inverted-V brace, displacements increased by 15.83%, 14.29%, and 10.09%.

Seismic response analyses and performance assessment of masonry-infilled reinforced concrete frame buildings in Bhutan without and with soft storey

2016 ◽  
Vol 20 (5) ◽  
pp. 822-839
Author(s):  
Kinzang Thinley ◽  
Hong Hao
Keyword(s):  
Reinforced Concrete ◽  
Return Period ◽  
Ground Motions ◽  
Reinforced Concrete Frame ◽  
Infill Wall ◽  
Soft Storey ◽  
Concrete Frame ◽  
Seismic Design Code ◽  
Frame Buildings ◽  
High Seismicity

Bhutan locates in a high seismicity region but has no seismic design code of its own. Recent devastating earthquake in Nepal, which is located in the same region as Bhutan and with similar construction types, raises the concern on the seismic safety of building structures in Bhutan. This study is aimed at assessing the performance of masonry-infilled and soft storey reinforced concrete frame buildings in Bhutan under the 475- and 2475-year return period ground motions predicted from the Probabilistic Seismic Hazard Analysis. A nonlinear strut model is used to model the infill wall, and the influence of openings and soil–structure interaction are considered in the analyses. The result suggests that the masonry-infilled reinforced concrete frame buildings in Bhutan could suffer repairable and irreparable damages under the 475-year return period ground motions and severe damages and even collapse under the 2475-year return period ground motion. The buildings with the soft storey are found to be more vulnerable than the normal masonry-infilled reinforced concrete buildings. The design recommendation of Indian Seismic Code improves the performance of soft storey buildings but cannot fully negate the soft storey effect. This study is the first such effort in assessing the performance of general building stocks in the high seismicity Bhutan. The results can guide the seismic strengthening options and can be used for further loss predictions for seismic preparedness of the country.

scholarly journals Numerical analysis of reinforced concrete frame buildings with decoupled infill walls

2020 ◽  
Vol 63 (4) ◽  
pp. 13-48
Author(s):  
Marko Marinković ◽  
Santiago Calvinisti ◽  
Christoph Butenweg
Keyword(s):  
Reinforced Concrete ◽  
Dynamic Characteristics ◽  
Numerical Models ◽  
Rc Frame ◽  
Reinforced Concrete Frame ◽  
Infill Wall ◽  
Infill Walls ◽  
Masonry Infill ◽  
Infilled Frame ◽  
Frame Buildings

Reinforced concrete (RC) buildings with masonry infill walls are widely used in many countries all over the world. Although infills are considered as non-structural elements, they significantly change dynamic characteristics of RC frame structures during earthquake excitation. Recently, significant effort was spent on studying decoupled infills, which are isolated from the surrounding frame usually by adding a gap between frame and infill. In this case, the frame deformation does not activate infill wall, thus infills are not influencing the behaviour of the frame. This paper presents the results of the investigation of the behaviour of RC frame buildings with the INODIS system that decouples masonry infills from the surrounding frame. Effect of masonry infill decoupling was investigated first on the one-bay one-storey frame. This was used as a base for parametric study on the frames with more bays and storeys, as well as on the building level. Change of stiffness and dynamic characteristics was analysed as well as response under earthquake loading. Comparison with the bare frame and traditionally infilled frame was performed. The results show that behaviour of the decoupled infilled frames is similar to the bare frame, whereas behaviour of frames with traditional infills is significantly different and demands complex numerical models. This means that if adequate decoupling is applied, design of infilled frame buildings can be significantly simplified.

scholarly journals PERKUATAN SEISMIK STRUKTUR RANGKA BETON BERTULANG MENGGUNAKAN BREISING BAJA TIPE X DAN V TERBALIK

2016 ◽  
Vol 4 (2) ◽  
Author(s):  
Made Sukrawa ◽  
Ida Bagus Dharma Giri ◽  
I Putu Deskarta ◽  
Made Hendra Prayoga
Keyword(s):  
Reinforced Concrete ◽  
Seismic Retrofitting ◽  
Frame Structure ◽  
Seismic Load ◽  
Reinforced Concrete Structure ◽  
Reinforced Concrete Frame ◽  
Braced Frame ◽  
Concrete Frame ◽  
Conventional Analysis ◽  
Brace Frames

Abstract: Analysis of reinforced concrete frame with steel braces has been done to compare the behavior of the open frame structure with reinforced concrete structure with steel braces. Three models of 2D open frame structure with 3, 4 and 5 floors were made and analyzed in SAP2000 v17 with intermediate detailing according to Indonesian Codes for Seismic Load (SNI 1726: 2002). 3-span frame structure with a span length of 6 m and level height of 3,5 m were designed according to SNI 1726: 2002, and then re-analyzed with special detailing according to New Indonesian Codes for Seismic Load (SNI 1726: 2012). After that, it was added with braces as seismic retrofitting. Two types of braces (X and concentric inverted V) were used in this study and analyzed with conventional analysis and stage construction analysis according to their stages of implementation. From the analysis results, several structure components that analyzed according to SNI 1726:2012 provitions were experience over-stressed. After retrofitted with steel braces, those components fulfill strength provition according to SNI 2847:2013 about structural concrete regulations for buildings. In addition to that, displacements that occurs on braced frame are smaller than displacements of the open frame structure with ratio of 0.08, 0.12, and 0.18 for X-brace frames with 3,4, and 5 storey and 0.07, 0.11, and 0.16 for inverted-V brace. With staged construction analysis, displacements of  X-braced frame structure increased by 14.38%, 13.62%, and 9.98% from the conventional analysis results for structure with 3, 4,and 5 storey. For structure with inverted-V brace, displacements increased by 15.83%, 14.29%, and 10.09%.

scholarly journals Case Study on Vulnerability Increase for a Reinforced Concrete Frame Structure

2015 ◽  
Vol 11 (3) ◽  
pp. 38-45
Author(s):  
Ioana Olteanu ◽  
Radu Marian Canarache ◽  
Mihai Budescu
Keyword(s):  
Reinforced Concrete ◽  
Fragility Curves ◽  
Response Spectrum ◽  
Frame Structure ◽  
Reinforced Concrete Frame ◽  
Concrete Frame ◽  
Capacity Curves ◽  
Performance Point ◽  
Reinforced Concrete Frame Structure

Abstract Seismic vulnerability for a structure represents the susceptibility to be affected by an event with a given intensity. The vulnerability of a structure can be influenced by the design methods or by different problems that may appear during the execution process. This paper shows a case study for the vulnerability increase of a reinforced concrete frame structure in 2 different situations: a) modification produced due to code changes, meaning P100-2006 respectively P100-2013; b) modifications produced the structure taking into account the errors which have occurred during the execution process; For both cases, capacity curves were plotted considering the nonlinear analysis, also called pushover. The numerical simulation was performed in SAP2000 software. These curves were compared with the response spectrum corresponding to the site conditions in order to obtain the performance point. For accurate results, fragility curves were plotted for both considered situations, according to previous research of the authors. The paper emphasizes the importance of each stage during the execution of a structure. More over the differences in the vulnerability index show the importance on the overall behavior of the structure. Solution to increase strength and safety for the structure are also given at the end of the paper

Reinforced Concrete Frame Structure Based on ANSYS Optimization Analysis and Material Properties

2013 ◽  
Vol 788 ◽  
pp. 571-574
Author(s):  
Shuo Wang ◽  
Fu Ma
Keyword(s):  
Reinforced Concrete ◽  
Response Spectrum ◽  
Structure Optimization ◽  
Minimum Cost ◽  
Parametric Modeling ◽  
Frame Structure ◽  
Reinforced Concrete Frame ◽  
Optimization Analysis ◽  
Concrete Frame ◽  
Reinforced Concrete Frame Structure

This article mainly focus on the research in two-way horizontal earthquake under the action of 5-layer reinforced concrete frame structure optimization analysis. This research utilizes ANSYS software to realize parametric modeling. By using beam and column section sizes as design variables and tructural strength, stiffness, the maximal displacement between the layers as well as reinforcement component limit as constraint conditions, with overall minimum cost as objective function, it has carried on the static analysis, seismic response spectrum to structure analysis and optimization analysis on structures.Also, cross section change has been compared before and after the structure optimization to find out whether structure of various important parameters meet the specification requirements and and reflect the certain economy.

scholarly journals Comparative Study of RC Multistorey Building with Floating Column and Shear Wall Subjected To Seismic Load

2021 ◽  
Vol 9 (9) ◽  
pp. 528-535
Author(s):  
Akshay Gajbhiye
Keyword(s):  
Spectrum Analysis ◽  
Response Spectrum ◽  
Shear Wall ◽  
Seismic Load ◽  
Base Shear ◽  
Response Spectrum Analysis ◽  
Soft Storey ◽  
Analysis And Design ◽  
Earthquake Zone ◽  
The Impact

Abstract : In modern multistorey building construction, irregularities like the soft storey, vertical and plan irregularities, floating columns etc are very common. Building with an open ground storey for parking is a common feature that results in floating columns. Floating columns provide column free space and a good aesthetic architectural view of the building. floating column means the end of any vertical element that rests on the beam which leads to discontinuity of columns such that the path of load distribution in multi-storey buildings is disturbed. The use of a floating column also tends to increase the moment in the column, storey shear etc which highly undesirable in seismically active areas. So, the study of the best location where the floating column needs to be provided to reduce the impact due to seismic loads is of primordial importance. Shear wall is a vertical member which is provided from foundation to top storey. In this study shear wall is used in the direction of orientation so that it provides additional strength and stiffness to the buildings. In the present analysis, 8 models are studied. The first model considers a multi-storeyed building without any shear wall and floating column. Other models analysed are with shear wall and by varying the location of floating columns. The analysis and design are done by STAAD.pro V8i SS6 version software and the method used is response spectrum analysis in earthquake zone 4. The effect of floating column location on parameters such as Base shear, Displacement, Maximum moment, storey shear and percentage of steel reinforcement are discussed. The comparison of results of different models is also carried out in detail using graphs and bar charts in this study. The suitable location for providing a floating column with the shear wall is also discussed. Keywords: Floating column, Shear wall, Seismic load, STAAD.pro.v8i, Response Spectrum Analysis.

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