scholarly journals Comparative analysis of vertical irregularities on high rise structure considering various parameters

2021 ◽  
Vol 1197 (1) ◽  
pp. 012024
Author(s):  
Prashant Hiwase ◽  
Vipul V Taywade ◽  
Sharda P. Siddh
Keyword(s):  
Tall Buildings ◽  
Regular Structure ◽  
Reinforce Concrete ◽  
Seismic Load ◽  
Seismic Structure ◽  
Maximum Displacement ◽  
Soft Storey ◽  
Code Of Practice ◽  
Irregular Structure ◽  
The Impact

Abstract Now, every day tall constructing structures constructed around the goal of residential and industrial cause etc. Layout of tall buildings both earthquake as well as wind loads got to be take into considered. An irregular structure, failure of structure starts at a point of its weakness and those weaknesses comesups withs separation of mass, stiffness and geometry of that models. The structures having this kinds of discontinuity are called Irregular structures. (H, J, & darshan, 2017) [2]. For example,Structures with the soft storey were the foremost remarkable fallen structures. Therefore, the impact of vertical alignment within the seismic structure of buildings is very significant. The changes in durability and size provide powerful features of those structures that are completely different from the standard structure. For this present evaluation ‘ETABS’ software package is employed. All Reinforced Concrete structural elements are follows as per ‘IS 456:2000 (Plane and Reinforce Concrete-Code of Practice, Bureau of Indian Standard)’. Seismic load follows with respect to IS 1893:2016 along with self-weight of modelles for analysis of the structure. Here 2 kinds of buildings of (G+15) were created one is regular structure and alternative one Mass irregular. To observe, Effect of lateral in both buildings using Seismic load and to check the results,most of maximum displacement for various models and various parameters.

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.

scholarly journals Evaluation of safety in arch dam using post analysis including inertia force and temperature variations of water

2020 ◽  
Vol 2 (1) ◽  
pp. 56-65
Author(s):  
Alaa Jabbar Rahman ◽  
Ali Majdi ◽  
Wissam Khlaf Obied
Keyword(s):  
Social Life ◽  
Water Pressure ◽  
Arch Dam ◽  
Gravity Dam ◽  
Inertia Force ◽  
Seismic Load ◽  
Concrete Gravity Dam ◽  
Maximum Displacement ◽  
Worst Case ◽  
The Impact

Dams considered as one if very important infrastructure, they are lifeline structures and have a vital role our economics and social life. A concrete gravity dam is one of wide used dam worldwide, it constructed from reinforced concrete and his typical cross section is triangular, the other type is arch section. A gravity dam can be combined with an arch dam into an arch-gravity dam for areas with massive amounts of water flow but less material available for a purely gravity dam. The inward compression of the dam by the water reduces the lateral (horizontal) force acting on the dam. Thus, the gravitation force required by the dam is lessened, i.e. the dam does not need to be so massive. The aim of this paper is to obtain a preliminary post analysis for an arch gravity dam by considering of typical applied loads that effects on it. In order to check and verify the dam and ensure the assumptions used during this process, the dam is analysed in different type of major effects such as own weight, water pressure, temperature and static load intertie generated from seismic load. These loads are presented in this paper in different cases, totally five cases combined between all these factors as explain in details in the section of methodology.To achieve the target of this study, modelling of an arch dam, reservoir and foundation provided by finite element using software ANSYS. An arch dam with height of 41.5 m is studied in this paper to simulate the reality of the future dam that will be erected as accurate as possible. The response of the dams is represented by the maximum displacement of it and also the stresses in each case. The results of all analysis were compared in the five cases mentioned above to determine the impact of each case as well as the worst case affecting the safety of the dam.

scholarly journals Dynamic Response Spectrum of Multi-Story Shear Frame Subjected to Moderate Ground Motion

2021 ◽  
Vol 14 (2) ◽  
pp. 71-79
Author(s):  
Assal Hussein
Keyword(s):  
Dynamic Response ◽  
Ground Motion ◽  
Response Spectrum ◽  
Response Spectra ◽  
Mode Shapes ◽  
Seismic Load ◽  
Seismic Zone ◽  
Maximum Displacement ◽  
Shear Frame ◽  
The Impact

Design structures to resist natural hazards is a vital issue to mitigate the impact of such threats. Earthquakes could lead to numerous injuries and infrastructure destruction. Specifically, when structures are not designed to resist seismic load.  This article presents dynamic analysis of four-story shear frame under moderate ground motion to determine the dynamic response. The proposed location of the considered frame is near Iraq-Iran border due to increase of seismic activities in last years. Structures in the considered seismic zone are essentially either residential or commercial buildings and not designed to resist seismic load, therefore structural system failure is probable. Simplified model is considered to determine response spectrum according to the International Building Code requirements. The algorithm of the analysis is developed using MATLAB® code to get mode shapes, response spectrum acceleration, maximum displacement, maximum shear forces, and modal participation mass at each story. The article develops design response spectra curve of Erbil city. Furthermore, the analysis results showed that first mode shape has more contribution than the other modes because higher percentage of the mass of the shear frame responds to the ground motion, and 88.53% of shear-frame mass is participating responds to the ground motion in the same mode

The Semi-Active Control Considering Structure-Basement-Pile-Soil Interaction

2010 ◽  
Vol 163-167 ◽  
pp. 2780-2786
Author(s):  
Yan Tao Li ◽  
Zhan Xue Zhou
Keyword(s):  
Active Control ◽  
Structural Control ◽  
Soil Structure ◽  
Tall Buildings ◽  
Interaction System ◽  
Subdomain Method ◽  
Infinite Element Method ◽  
Fixed End ◽  
Instantaneous Optimal Control ◽  
The Impact

The interaction system which includes pi1e-supported tall buildings with multistoried basements and the adjacent medium of soil subject to the impact of earthquake is formulated in terms of the spline subdomain method,semi-analytical infinite element method and the bend-shear model of beam element,respectively.Taking advantage of the instantaneous optimal control algorithm, structure-basements-piles-soil interaction effect on the semi-active control is considered. It is shown that the results of structural control have obvious difference between the interaction system and the fixed-end system.The response of the former may be less about 10 percent than the latter in the paper.The dissipative capability of the structure self may be ignored largely if the interaction isn’t considered.When designing the system of the semi-active control, especially for some tall buildings,soil-structure interaction should be taken into consideration.

scholarly journals Solutions Journalism: Strategies for Effecting and Managing Change

2021 ◽  
Vol 17 (1) ◽  
pp. 60-85
Author(s):  
Mark Lowes ◽  
Sherry Devereaux Ferguson
Keyword(s):  
Social Media ◽  
Good News ◽  
News Article ◽  
Citizen Journalism ◽  
Traditional Schools ◽  
New Paradigm ◽  
News Reporting ◽  
Code Of Practice ◽  
Solutions Journalism ◽  
The Impact

The field of journalism is undergoing epic changes at this time. With the growing impact of social media and citizen journalism, among other trends, traditional schools of journalism face a need to re-examine their most fundamental premises. Historically journalists adopted a code of practice whereby the ideal news article focused on issues and problems of consequence to society, and reporters presented both sides of the case. The gold standard was balanced reporting that investigated and uncovered abuses in society, with the mantra being “if it bleeds, it leads.”. There was no added incentive or requirement to take responsibility for solving the problems they uncovered. While print media organizations faced a backlash of criticism following the era of “yellow journalism,” they did not confront the necessity to reorient the entire profession; rather they simply had to “clean up their act” and operationalize what they already knew and believed. Today, the situation is dramatically different—largely as a consequence of the rise of citizen journalism, the impact of social media, and the trend toward an introspective look at their profession by journalists themselves and by those who train the journalists. In this article, we look at the emerging focus on a phenomenon called solutions journalism. Solutions journalism differs in both form and intent from not only the traditional standard of reporting, which focuses on problems, but also “good news reporting,” which tends to be superficial and non-solution oriented. In an effort to understand the current push for a new direction in the journalism profession, we will look at the rise of the new paradigm, pioneers in solutions journalism, characteristics of solutions journalism, and the theoretical foundations of solutions journalism. In exploring the latter point, we will examine the relationships among solutions journalism, social media, open source, systems, and open innovation theories.

scholarly journals Impact of Slab Thickness on Reinforced Concrete Buildings using Fragility Curves

2020 ◽  
Vol 8 (5) ◽  
pp. 4533-4538
Keyword(s):  
Reinforced Concrete ◽  
Fragility Curves ◽  
Structural Response ◽  
Software Tool ◽  
Slab Thickness ◽  
Ground Shaking ◽  
Code Of Practice ◽  
Short Period ◽  
Rc Frame Structures ◽  
The Impact

Earthquakes are the natural disaster occurring since years but during the last two decades they are causing huge looses whether it may economic or to life. This paper focuses to evaluate the seismic performance of various building confirming to Indian standard criteria for earthquake resistant design of structures and ductile detailing of reinforced concrete structures subjected to seismic Forces-code of practice, Bureau of Indian Standards, both as per the revised codes in the year 2016. Due to ground shaking, seismic loads are the governing load and thus it becomes necessary to assess the conditional probability of structural response. Use of HAZUS methodology is followed to construct seismic fragility curves as it is well-organized and defined approach. Spectral displacement plays the functional parameter to derive the expected damage for fragility. This work represented here is compiled by means of procedure for establishing the fragility curves for three typical Reinforced Concrete (RC) frame structures having variations resembling 3 storey intended for short-period structures, 6 storey used for medium-period structures and 12 storey representing long-period structures using SAP2000 as a software tool for analyzing the structure. Furthermore an attempt is made for focus on the variation of one of the major structural configuration i.e. slab thickness which is not certainly paid attention as compared to columns and beams. Slabs adds additional stiffness to the structure which can enlighten how it behaviour would be when subjected to ground excitation. As a result, the fragility curves are plotted to study the impact due to slab thickness in order they are carefully selected while design.

scholarly journals Influence of non-gravitational effects on the Centaur upper stage of the Surveyor 2 spacecraft

2021 ◽  
Vol 2103 (1) ◽  
pp. 012029
Author(s):  
A A Martyusheva ◽  
A V Devyatkin
Keyword(s):  
Solar Radiation Pressure ◽  
Close Approach ◽  
Major Axis ◽  
Semi Major Axis ◽  
Maximum Displacement ◽  
Gravitational Effects ◽  
Yarkovsky Effect ◽  
Upper Stage ◽  
The Impact ◽  
Heliocentric Orbit

Abstract A small near-Earth asteroid, discovered by the Panoramic Survey Telescope and Rapid Response System (Pan-STARRS) on September 17, 2020, turned out to be a part of the Centaur upper stage of the Surveyor 2 spacecraft launched by NASA on September 20, 1966 and subsequently crashed. This object had moved in a heliocentric orbit until it was under the influence of Earth’s gravitational field. As a result, a close approach to the Earth took place at a distance of about 50000 km on December 1, 2020. Despite the fact that the Centaur escaped back into a new orbit around the Sun in March 2021, it is of special interest for research, in particular, to consider the impact of non-gravitational effects on its orbital characteristics. Thus, it was calculated that the maximum displacement of the object trajectory due to the influence of solar radiation pressure over 15 years (the next close approach will take place in 2036) can be about 10.3-13.5 km, depending on the albedo. Estimations of the Yarkovsky effect showed that the magnitude of the expected change in the semi-major axis of Centaur’s orbit is from -8.1 • 10−13 to 1.6 10−13, depending on the angle of its rotation.

scholarly journals Seismic Performance of Multistorey RC Frame Building With The Soft Storey and Masonry Infill

2021 ◽  
pp. 650-656
Author(s):  
Kugan K ◽  
Mr. Nandha Kumar P ◽  
Premalath J
Keyword(s):  
Time History ◽  
Seismic Loading ◽  
Rc Frame ◽  
Base Shear ◽  
Maximum Displacement ◽  
Soft Storey ◽  
Masonry Infills ◽  
Frame Building ◽  
History Analysis ◽  
Rc Frame Building

In this study, four geometrically similar frames having different configurations of masonry infills, has been investigated. In this article attempts are made to explain the factors that impact the soft storey failure in a building are compared with different type of infill. That is Four models like RC bare frame, RC frame with brick mansonry infill, RC frame with brick infill in all the storeys exept the firstsoft storey, RC frame with inverted V bracing in the soft storey. Time history analysis has been carried out for a G+8 multistoried building to study the soft storey effect at different floor levels using E tabs software. The behavior of RC framed building with soft storey under seismic loading has been observed in terms of maximum displacement ,maximum storey drift, base shear and storey stiffness as considered structure.

Potential Insights from Performance-Based Design of Fire Protection in Tall Buildings

2019 ◽  
Author(s):  
Pierre Ghisbain ◽  
Jenny Sideri ◽  
Reyhaneh Abbasi ◽  
Luciana Balsamo ◽  
Reza Imani ◽  
...  
Keyword(s):  
Fire Protection ◽  
Mechanical Response ◽  
Tall Buildings ◽  
Element Model ◽  
Fire Effects ◽  
Design Fire ◽  
Fire Engineering ◽  
Fire Scenarios ◽  
Fire Loading ◽  
The Impact

<p>Analysis of the structural performance under realistic fire scenarios makes Performance Based Fire Engineering (PBFE) particularly suited to design fire protection of tall buildings. In this paper, the impact of using the PBFE method is studied using a standard tall building as an example. The parametric temperature- time curves recommended in Eurocode 1 are used to define the fire loads. The thermal and mechanical response of the building to the imposed fire loading is subsequently analyzed by means of a finite element model of the mixed-use tower. Particular care is devoted to analyzing the performance of a steel truss at a transfer level, to study potential global effects of a local fire, effects that are not studied or understood within the prescriptive design framework.</p>

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