scholarly journals Wind Analysis of Tall Buildings for Vertical Irregularity : A Review

2020 ◽  
pp. 121-126
Author(s):  
Syed Mudassir ◽  
Kuldeep Dabhekar ◽  
Syed Faiz ◽  
Isha P. Khedikar
Keyword(s):  
Tall Buildings ◽  
Bending Moment ◽  
Wind Load ◽  
Base Shear ◽  
Structural Behaviour ◽  
Analysis And Design ◽  
Irregular Structure ◽  
Axial Forces ◽  
Tall Structures ◽  
Wind Analysis

Now every day, various buildings are being built for different purposes such as residential, commercial, and industrial etc. In general, in order to stabilize these longitudinal tall structures for both loads such as gravity and lateral (wind and earthquake) loads are required to take when considering the analysis and design. In addition to this there are several types of structures or buildings having different geometry in vertical and horizontal plan in the sense regular or irregular. This paper presents detailed review on the analysis of vertically irregular structure subjected to wind loads, the failure of structure starts from the weak point or joint. This weakness is exacerbated by the uneven distribution of mass, changes in elasticity or stiffness and also changes in the vertical geometry of the structure. Properties that have objections to physical or geometric regularity are referred to as irregular structures. The present study shows a review on analysis and effects in vertical irregular structure under lateral load especially in case of wind load. Many structural software and standard codes are reviewed for the creation of all members under wind load. At the end of this paper concerns the comparison of regular building with irregular structure and describes the effects in vertical irregular structure with the help of structural behaviour such as displacement, drift, axial forces, base shear and bending moment etc.

scholarly journals Comparative Analysis of RC Building Using Dampers and with Shear Wall under Wind Load: A Review

2021 ◽  
Vol 9 (10) ◽  
pp. 490-495
Author(s):  
Bashar Iqbal
Keyword(s):  
Comparative Analysis ◽  
Tall Buildings ◽  
Shear Wall ◽  
Wind Load ◽  
Lateral Loads ◽  
Human Beings ◽  
Friction Damper ◽  
Wind Analysis ◽  
Highly Sensitive ◽  
Rc Building

Abstract: The requirement of tall building in recent years increase the construction to satisfy the need of human beings. Very tall buildings located in high velocity wind area are highly sensitive therefore calculation and analysis of wind load is very impotent. Due to change in climatic condition the basic wind speed are increases. The main aim of this paper is to introducing the different techniques which is used to reduce the effect of wind load or lateral loads. Keywords: wind analysis, comparative analysis, TMD (tuned mass damper),friction damper, shear wall

scholarly journals Effects of pounding on the behavior of reinforced concrete frame structures in seismic zone 2B

2021 ◽  
Author(s):  
Muhammad Hamid ◽  
◽  
Fayyaz Ur Rahman ◽  
Qaisar Ali ◽  
◽  
...  
Keyword(s):  
Structural Damage ◽  
Bending Moment ◽  
Frame Structures ◽  
Seismic Zone ◽  
Structural Members ◽  
Reinforced Concrete Frame ◽  
Ground Acceleration ◽  
Maximum Displacement ◽  
Analysis And Design ◽  
Axial Forces

Pounding between adjacent buildings is a common phenomenon which can be observed during moderate to high ground shakings that can result in structural damage and even loss of life. As this phenomenon is related to the life safety, therefore, it is imperative to consider it in the modelling stage of structural analysis and design. The current study is intended to evaluate, numerically, the effect of pounding phenomenon in RC frame structures. Three dimensional models of two hypothetical buildings are analyzed by subjecting to three ground acceleration histories that are scaled and matched with BCP-SP07 design spectrum. The analysis results such as inter storey drift, maximum displacement, pounding forces and its effects on bending moment, axial forces, shear and torsional forces in structural members are compared. The results show that pounding forces decrease with increase in gap size and are dominant in top five stories with maximum force at the top floor level. Pounding increase displacement up to 2 times and acceleration up to 240 times as compared to without pounding case. Pounding increase the axial forces up to 250 times and bending moment up to 2 time in the beams parallel to colliding forces. Similarly, the shear forces and torsional moments are almost doubled as a result of pounding. Finally, a 20 storey building consists of four blocks separated by 3-inch expansion joints is modelled combinedly in Etabs and analyzed to see the effect of pounding. Based on the results it is concluded that pounding must be considered at modelling stage of the design to account for the forces induced in the structural members.

scholarly journals Investigation responses of the diagrid structural system of high-rise buildings equipped with Tuned mass damper using new dynamic method

2021 ◽  
Vol 1 (2) ◽  
Author(s):  
Arash Karimipour ◽  
Mansour Ghalehnovi ◽  
Mahmoud Edalati ◽  
Mehdi Barani
Keyword(s):  
Dynamic Method ◽  
Lateral Displacement ◽  
Tall Buildings ◽  
Tuned Mass Damper ◽  
Structural System ◽  
Base Shear ◽  
Structural Behaviour ◽  
High Rise ◽  
Mass Damper ◽  
Story Drift

Due to the shortage of land in cities and population growth, the significance of high rise buildings has risen. Controlling lateral displacement of structures under different loading such as an earthquake is an important issue for designers. One of the best systems is the diagrid method which is built with diagonal elements with no columns for manufacturing tall buildings. In this study, the effect of the distribution of the tuned mass damper (TMD) on the structural responses of diagrid tall buildings was investigated using a new dynamic method. So, a diagrid structural systems with variable height with TMDs was solved as an example of structure. The reason for the selection of the diagrid system was the formation of a stiffness matrix for the diagonal and angular elements. Therefore, the effect of TMDs distribution on the story drift, base shear and structural behaviour were studied. The obtained outcomes showed that the TMDs distribution does not significantly affect on improving the behaviour of the diagrid structural system during an earthquake. Furthermore, the new dynamic scheme represented in this study has good performance for analyzing different systems. 

scholarly journals A Simplified Approach for Analysis and Design of Reinforced Concrete Circular Silos and Bunkers

2018 ◽  
Vol 12 (1) ◽  
pp. 234-250
Author(s):  
Muhammad Umair Saleem ◽  
Hassan Khurshid ◽  
Hisham Jahangir Qureshi ◽  
Zahid Ahmad Siddiqi
Keyword(s):  
Reinforced Concrete ◽  
Design Procedure ◽  
Bending Moment ◽  
Efficient Design ◽  
Simplified Approach ◽  
Analysis And Design ◽  
Design Procedures ◽  
Axial Forces ◽  
Design Skills ◽  
Seismic Forces

Background: Reinforced concrete silos and bunkers are commonly used structures for large storage of different materials. These structures are highly vulnerable when subjected to intense seismic forces. Available guidelines for analysis and design of these structures require special design skills and code procedures. Objective: The current study is aimed to elaborate the design procedures from different sources to a unified method, which can be applied to a larger class of reinforced concrete silos. In this study, analysis and design procedures are summarized and presented in a simplified form to make sure the efficient practical design applications of reinforced concrete silos. Method: Four different cases of silo design based on the type and weight of stored material were considered for the study. For each case, the silo was designed using given design procedure and modeled using FEM-based computer package. All of the reinforced concrete silos were subjected to gravity, wind and seismic forces. Results: After performing the analysis and design of different silos, the bending moment, shear force and axial forces profiles were given for a sample silo. The results obtained from the proposed design procedure were compared with FEM values for different components of silos such as slab, wall and hopper. Conclusion: The comparison of tangential and longitudinal forces, bending moments, shear forces and reinforcement ratios of different parts of silos have shown a fair agreement with the FEM model results. It motivates to use the proposed design procedure for an efficient design of reinforced concrete silos.

scholarly journals Behaviour of RC Buildings with Single and Double Outriggers under Seismic Response

2020 ◽  
Vol 9 (3) ◽  
pp. 1477-1483
Keyword(s):  
Urban Communities ◽  
Seismic Response ◽  
Response Spectrum ◽  
Tall Buildings ◽  
Bending Moment ◽  
Shear Walls ◽  
Building Models ◽  
Tall Structures ◽  
Initial Stage ◽  
The Ideal

Today, tall structures are inescapable in urban communities. Along these lines, the structure requires a production system which can effectively participate in resisting the applied wind and earthquake loads. Among the available lateral load resisting systems, outrigger, as rigid horizontal elements connect shear walls to exterior columns is the most commonly used to enhance tall structures performance under lateral forces. A series of dynamic response spectrum (RS) analyses devoted to assess the seismic response behavior of R.C tall buildings with central core wall having outrigger system. Several models with and without outrigger systems were considered in the analysis in order to investigate the ideal position and the number of outriggers. The developed building models have either one or two outriggers. Structural software package ETABS was used to develop the considered herein different configurations of the building models as well as performing the dynamic analysis. The performance of the considered different configurations was investigated in terms of displacement and inter-storey drift peak profiles. Sensitivity to the position of outrigger on the induced wall bending moment was also explored comparing the responses of the different configurations. The results of the performed study can provide structural designers with the optimum location of a single or either double outrigger in order to minimize the induced seismic response during the initial stage of the outrigger system design process. The optimum locations of outriggers are quarter height of the building in case of using single outrigger and at quarter and three quarters of the building in case of using double outrigger in order to minimize the induced moment values on the core and columns

scholarly journals Response of Multistory Irregular L Shape Building under Basic Wind Speed of 39 m/s

2018 ◽  
Vol 8 (6) ◽  
Author(s):  
Sagar Jamle ◽  
Ashish Sadh ◽  
Ankit Pal
Keyword(s):  
Wind Speed ◽  
Transverse Direction ◽  
Research Work ◽  
Tall Buildings ◽  
Multistory Buildings ◽  
Axial Forces ◽  
Wind Analysis ◽  
Cantilever Structure ◽  
Story Drift ◽  
Story Building

Wind analysis in this era considered as a main criteria for modern tall buildings such that the tall buildings are considered as a cantilever structure which is fixed at its base and is free at other end. These multistory buildings are not same in plan and having different projections which is vulnerable to wind and its exposures. The main criteria in this research work is to present the position of these tall buildings having plan of L – shape 20 story building under a basic wind speed of 39 m/s. Using Staad pro software, a total of 4 cases has analyzed. Dimension of plan is different from both the projection on which wind is applied in all four directions. A comparison of result parameters like displacements, story drift, axial forces in column, shear in beam in both longitudinal and transverse direction are made for all the models and suggestions are made to choose which position is the best of all.

scholarly journals Driven Pile Effects on Nearby Cylindrical and Semi-Tapered Pile in Sandy Clay

2021 ◽  
Vol 11 (7) ◽  
pp. 2919
Author(s):  
Massamba Fall ◽  
Zhengguo Gao ◽  
Becaye Cissokho Ndiaye
Keyword(s):  
Coupling Effect ◽  
Lateral Displacement ◽  
Bending Moment ◽  
Adaptive Mesh ◽  
Pile Driving ◽  
Arbitrary Lagrangian Eulerian ◽  
Axial Forces ◽  
Tapered Pile ◽  
Driven Pile ◽  
The Impact

A pile foundation is commonly adopted for transferring superstructure loads into the ground in weaker soil. They diminish the settlement of the infrastructure and augment the soil-bearing capacity. This paper emphases the pile-driving effect on an existing adjacent cylindrical and semi-tapered pile. Driving a three-dimensional pile into the ground is fruitfully accomplished by combining the arbitrary Lagrangian–Eulerian (ALE) adaptive mesh and element deletion methods without adopting any assumptions that would simplify the simulation. Axial forces, bending moment, and lateral displacement were studied in the neighboring already-installed pile. An investigation was made into some factors affecting the forces and bending moment, such as pile spacing and the shape of the already-installed pile (cylindrical, tapered, or semi-tapered). An important response was observed in the impact of the driven pile on the nearby existing one, the bending moment and axial forces were not negligible, and when the pile was loaded, it was recommended to consider the coupling effect. Moreover, the adjacent semi-tapered pile was subjected to less axial and lateral movement than the cylindrical one with the same length and volume for taper angles smaller than 1.0°, and vice versa for taper angles greater than 1.4°.

scholarly journals Parametric Analysis of Rotational Effects in Seismic Design of Tall Structures

2021 ◽  
Vol 11 (2) ◽  
pp. 597
Author(s):  
Milan Sokol ◽  
Rudolf Ároch ◽  
Katarína Lamperová ◽  
Martin Marton ◽  
Justo García-Sanz-Calcedo
Keyword(s):  
Seismic Design ◽  
Parametric Study ◽  
Tall Buildings ◽  
Soil Parameters ◽  
Eurocode 8 ◽  
Tall Structures ◽  
Rotational Components ◽  
Different Types ◽  
Depth Study

This paper uses a parametric study to evaluate the significance of the rotational components of Earth’s motion in a seismic design. The parametric study is based on the procedures included in Eurocode 8, Part 6. Although the answer to the question of when the effects of rotational components are important is quite a complex one and requires a more in-depth study, our aim was to try to assess this question in a relatively quick manner and with acceptable accuracy. The first part of the paper is devoted to derivation of a simple formula that can be used for expressing the importance of rotational components in comparison with the classic seismic design without their usage. The quasi-static analysis, assuming inertial forces, is used. A crucial role plays the shape of the fundamental mode of the vibration. Due to simplicity reasons, well-known expression for estimation of the first eigenmode as an exponential function with different power coefficients that vary for different types of buildings is used. The possibility of changing the soil parameters is subsequently included into the formula for estimation of the fundamental frequency of tall buildings. In the next part, the overall seismic analyses of complex FEM models of 3D buildings and chimneys are performed. The results from those analyses are then compared with those from simplified calculations. The importance of the soil characteristics for determination of whether it is necessary to take into account the rotational effects is further discussed.

The effect of element strength assignment on the torsional response of stiffness-eccentric systems

2013 ◽  
Vol 40 (7) ◽  
pp. 655-662
Author(s):  
George K. Georgoussis
Keyword(s):  
Structural Design ◽  
Shear Force ◽  
Ground Motions ◽  
Building Structures ◽  
Centre Of Mass ◽  
Base Shear ◽  
Structural Behaviour ◽  
Torsional Response ◽  
Building Models ◽  
Storey Building

Building structures of low or medium height are usually designed with a pseudostatic approach using a base shear much lower than that predicted from an elastic spectrum. Given this shear force, the objective of this paper is to evaluate the effect of the element strength assignment (as determined by several building codes) on the torsional response of inelastic single-storey eccentric structures and to provide guidelines for minimizing this structural behaviour. It is demonstrated that the expected torque about the centre of mass (CM) may be, with equal probability, positive (counterclockwise) or negative (clockwise). This result means that the torsional strength should also be provided in equal terms in both rotational directions, and therefore the base shear and torque (BST) surface of a given system must be symmetrical (or approximately symmetrical). In stiffness-eccentric systems, appropriate BST surfaces may be obtained when a structural design is based on a pair of design eccentricities in a symmetrical order about CM, and this is shown in representative single-storey building models under characteristic ground motions.

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