scholarly journals The effect of story drift in a multi-story building under the influence of an earthquake

2021 ◽  
Vol 17 (3) ◽  
pp. 270-277
Author(s):  
Dmitriy A. Sharapov ◽  
Tesfaldet H. Gebre ◽  
Yusuf M. Ali
Keyword(s):  
Reinforced Concrete ◽  
Horizontal Plane ◽  
Seismic Behavior ◽  
Lateral Force ◽  
Seismic Loads ◽  
Reinforced Concrete Structure ◽  
Maximum Displacement ◽  
Concrete Building ◽  
Story Drift ◽  
Story Building

This paper content is structure subjected sudden story drift as a result from earthquakes, forming hinges and eventually collapsing. The aim of this paper is to develop building thirty story building for seismic in Khartoum using finite element method (FEM) and the equivalent lateral force (ELF) procedure of American code ASCE 7-16. In current work the thirty-story reinforced concrete building was considered is to analyze the seismic behavior of the reinforced concrete structure to find the drift between the story by finding the maximum displacement from the program that causes the building to collapse, by choosing the shear wall as the support system to resist the lateral load and by looking to model the building inclined to the horizontal plane. Calculations were also made on the drift between the story to compare with the allowable drift. It is implemented in the Robot structural program - an ingenious program for designing and analyzing lateral (seismic) loads.

scholarly journals Optimization of a reinforced concrete structure subjected to dynamic wind action

2021 ◽  
Vol 16 (59) ◽  
pp. 326-343
Author(s):  
Jherbyson Brito ◽  
Letícia Miguel
Keyword(s):  
Reinforced Concrete ◽  
Cross Sections ◽  
Concrete Structure ◽  
Frame Structure ◽  
Reinforced Concrete Structure ◽  
Maximum Displacement ◽  
Reinforced Concrete Building ◽  
Synoptic Wind ◽  
Whale Optimization ◽  
Concrete Building

This work proposes a methodology to optimize a reinforced concrete structure. For this, the Whale Optimization Algorithm (WOA) algorithm was used, an algorithm from the group of metaheuristic algorithms, which presents an easy computational implementation. As a study object, a frame structure adapted from a real reinforced concrete building was used, subjected to the dynamic action of artificially generated synoptic wind. The objective function is to reduce the volume of concrete of the structure. For that, the dimensions of the cross-sections were used as design variables, and the maximum displacement at the top imposed by the ASCE / SEI 7-10 standard as a lateral constraint, as well as the maximum story drift between floors. In addition to this structural optimization, it was also proposed the use and optimization of Tuned Mass Dampers (TMD), in different quantities, positions and parameters, improving the dynamic response of the reinforced concrete building. The results show that for this situation it was possible to reduce the concrete volume of the structure by approximately 24%, respecting the maximum limit of displacement at the top required by the standard.

Seismic Performance of a Mixed Masonry-Reinforced Concrete Building

2015 ◽  
pp. 293-312 ◽  
Author(s):  
Vincenzo Gattulli ◽  
Francesco Potenza ◽  
Filippo Valvona
Keyword(s):  
Reinforced Concrete ◽  
Seismic Performance ◽  
Discrete Models ◽  
Reinforced Concrete Structure ◽  
Reinforced Concrete Building ◽  
Seismic Performance Evaluation ◽  
Current Limit ◽  
Concrete Building ◽  
Nonlinear Static Procedure ◽  
The City

The 6th of April 2009, a quite strong earthquake of magnitude ML =5.8 (Mw=6.3), struck in the city of L'Aquila. The seismic event caused serious injure to several masonry buildings, compromising a large part of the valuable historical and architectural heritage. The present work deals with seismic performance evaluation of an existing mixed masonry-reinforced concrete building in downtown L'Aquila city. A comprehensive discussion on the current limit capacity of the building based on the visual inspections of the occurred seismic damage, the experimental data from a wide campaign of on-site tests on the material properties, the results of numerical simulations from different naturally discrete models of the mixed masonry-reinforced concrete structure are presented. The seismic performance is evaluated through well-recognized N2 nonlinear static procedure. The Frame by Macro-Elements method is used to define an equivalent 3D frame representation of the structure. The obtained numerical results are directly compared with the surveyed damages.

High-Rise Building Seismic Vibration Control Using Large Tuned Top-Floor Mass Damper

2009 ◽  
Vol 4 (3) ◽  
pp. 246-252
Author(s):  
Akifumi Makino ◽  
Keyword(s):  
Reinforced Concrete ◽  
Vibration Control ◽  
Large Scale ◽  
Response Analysis ◽  
Strong Wind ◽  
Reinforced Concrete Structure ◽  
Vibration Period ◽  
High Rise ◽  
Mass Damper ◽  
Story Drift

This paper details the design of a high-rise reinforced concrete building whose top floor is isolated and used as the mass for a large-scale mass damper, describing the effect of the vibration control realized. Conventional mass dampers with additional weight at the building tops have been installed to improve environmental vibration against strong wind. Mass dampers have rarely been used, however, as measure against earthquakes. We developed large-scale vibration control using the top floor building weight to serve as a mass damper. The building is a high-rise reinforced concrete structure, 162 meters high, with 43 above-ground stories. Based on seismic response analysis using artificial earthquake waves, the natural vibration period of the mass damper was tuned to decrease story drift in the entire building. The mass damper reduced maximum story drift angle by 20%.

The influence of construction joint on the seismic behavior of reinforced concrete frame structure

2016 ◽  
Vol 20 (7) ◽  
pp. 1125-1138 ◽  
Author(s):  
Jing Yu ◽  
Xiaojun Liu ◽  
Xingwen Liang
Keyword(s):  
Reinforced Concrete ◽  
Seismic Behavior ◽  
Numerical Models ◽  
Time History ◽  
Frame Structure ◽  
Nonlinear Time History Analysis ◽  
Reinforced Concrete Frame ◽  
Concrete Frame ◽  
Construction Joint ◽  
Story Drift

A new model that can simulate the behavior of construction joint subjected to seismic forces was proposed. Nonlinear time-history analysis was carried out for reinforced concrete regular frame structures designed in different seismic intensity regions as well as with different height-to-width ratios. Two kinds of numerical models are adopted to simulate the seismic behavior of each frame, one with construction joint using the new proposed model and the other without construction joint using the conventional model. Results show that the influence of construction joint on the seismic behavior of reinforced concrete frame is strongly related to structural nonlinearity. It may increase the top displacement and the inter-story drift, change the inter-story drift distributions, and exacerbated the local reaction of key members. The influence of construction joint cannot be ignored for structures with low emergency capacity against major earthquake. Seismic design suggestions are proposed from the aspect of calculation analysis method.

scholarly journals The Effect of Horizontal Vulnerability on the Stiffness Level of Reinforced Concrete Structure on High-Rise Buildings

2020 ◽  
Vol 6 (1) ◽  
pp. 49
Author(s):  
Fanny Monika ◽  
Berkat Cipta Zega ◽  
Hakas Prayuda ◽  
Martyana Dwi Cahyati ◽  
Yanuar Ade Putra
Keyword(s):  
Reinforced Concrete ◽  
Structural Model ◽  
Structural Models ◽  
Time History ◽  
Building Construction ◽  
Reinforced Concrete Structure ◽  
Religious Activities ◽  
Maximum Displacement ◽  
Building Model ◽  
High Rise

Buildings have an essential function; they are a place for people to carry out various activities, such as social, economic, and religious activities. In a building construction plan, considering multiple factors from strength to architecture is necessary. The issue of limited land in some areas has resulted in the construction of vertical buildings, often known as high-rise buildings. High-rise building construction requires paying attention to various levels of vulnerabilities, especially for projects in earthquake-prone areas. In this study, the levels of vulnerability and vertical irregularity of high-rise buildings were analyzed based on structural rigidity for reinforced concrete structures. Building models including a cube-shaped model, L-shaped model, and U-shaped model were investigated. The STERA 3D program was used to determine the strength values of the structures by providing earthquake loads on each structure model using the time-history analysis method. The El Centro and Kobe earthquakes were tested in these structural models because the earthquakes are known to contribute the most exceptional damage value in the history of earthquake-caused disasters. The assessed parameters of the tested structural models include structural stiffness, the most significant displacement in the structure, the maximum displacement and load relations experienced by the construction, and the hysteretic energy exhibited by the structure. Therefore, the best performed structural model in resisting the load could be obtained. The results showed that the U-shaped building model had the highest stiffness value with an increase in stiffness of 7.43% compared with the cube-shaped building model and 3.01% compared with the L-shaped building model.

METHOD OF EVALUATION OF THE FIRE RESISTANCE OF COMPOSITE BUILDING STRUCTURES

2018 ◽  
Vol 8 (3) ◽  
pp. 12-17
Author(s):  
Denis A. PANFILOV ◽  
Nikolay A. ILYIN ◽  
Yury V. ZHILTSOV ◽  
Ekaterina V. BLINKOVA
Keyword(s):  
Reinforced Concrete ◽  
Fire Resistance ◽  
Concrete Structure ◽  
Building Structures ◽  
Reinforced Concrete Structure ◽  
Resource Saving ◽  
Concrete Building ◽  
Innovative Solution ◽  
Method Of Evaluation ◽  
Building Practice

The article describes a new method for determining the design fi re resistance of composite (steel-concrete) building constructions of buildings. The advanced algorithm of the decision of the fi re-technical task in the part of express calculation of design fi re resistance of composite building constructions is given. A new constructive form of composite reinforced concrete structure of the building has been developed and the system of actions for assessing the fi re resistance of its elements at the level of inventions, which are implemented in building practice, has been improved. The components of the creative result of scientifi c work and the content of the technical eff ect, including resource saving, are introduced, with the introduction of an innovative solution in the practice of fi re protection and providing fi re resistance of perspective building constructions of buildings.

Displacement and Vibration Behavior of Reinforced Concrete Cantilever

2013 ◽  
Vol 848 ◽  
pp. 100-103
Author(s):  
Xin Yan Wu ◽  
An Ping Lou
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Vibration Frequency ◽  
Element Model ◽  
Reinforced Concrete Structure ◽  
Maximum Displacement ◽  
Analysis And Design ◽  
First Order ◽  
Finite Element Software ◽  
Cantilever Length

In this paper, finite element model (FEM) of a reinforced concrete structure cantilevered slab was established in non-linear finite element software ABAQUS. Influence of cantilever length and tensile reinforcement on the structural displacement and vibration frequency was calculated. The results show that the vibration frequency of the first order and maximum displacement will various with the diameter of the reinforced cantilever slab and the length of the cantilevered slab. This paper will offer the references to the analysis and design of the cantilever slab.

Implications of Experiments on the Seismic Behavior of Gravity Load Designed RC Beam-to-Column Connections

1996 ◽  
Vol 12 (2) ◽  
pp. 185-198 ◽  
Author(s):  
Attila Beres ◽  
Stephen P. Pessiki ◽  
Richard N. White ◽  
Peter Gergely
Keyword(s):  
Reinforced Concrete ◽  
Seismic Behavior ◽  
Test Results ◽  
Joint Shear Strength ◽  
Cornell University ◽  
Gravity Load ◽  
Concrete Building ◽  
Load Effects ◽  
Definition Of ◽  
Reversed Cyclic

This paper summarizes recent experimental research at Cornell University conducted on the behavior of gravity load designed reinforced concrete building frame components subjected to reversing cyclic loads (simulated seismic effects). Reinforced concrete framing systems, designed primarily for gravity loads, with little or no attention given to lateral load effects, are typically characterized by non-ductile reinforcing details in the joint regions and in the members. The seismic response of connection regions for gravity load design (GLD) frames has received relatively little attention in earlier studies, thus making it difficult to reliably evaluate GLD frames and to properly plan repair or retrofit strategies. Thirty-four full scale bare interior and exterior beam-to-column joints have been tested under reversed cyclic bending to identify the different damage mechanisms and to study the effect of critical details on strength and deformations. The discussion of test results focuses on the definition of joint shear strength factors for GLD frames to complement those provided by ACI-ASCE Committee 352 for frames designed with better details.

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