scholarly journals Performance Analysis of Steel Portal Structures with Braces Designed Based on Allowable Interstory Drift Limits

2019 ◽  
Vol 1 (2) ◽  
pp. 87-102
Author(s):  
Zulfazly Putra ◽  
Johannes Tarigan
Keyword(s):  
Structural Analysis ◽  
Response Spectrum ◽  
Soft Soil ◽  
Pushover Analysis ◽  
Three Dimensional ◽  
Time History ◽  
Performance Level ◽  
Frame Structure ◽  
Soil Conditions ◽  
Interstory Drift

Abstract. The earthquake resistant steel frame structure is designed to be able to withstand large inelastic deformations in the case of an earthquake. The applicable regulations still allow the use of elastic design methods in the form of pushover analysis and time history analysis evaluation as the basis for the design. The building under consideration consists of six floors with the function as an office building. The location of the building is in Banda Aceh with soft soil conditions. The structural analysis used the help of the Extended Three Dimensional Analysis of Building System Program (ETABS). The method of analysis of steel portal structures used was pushover analysis. Analysis of the given load was static loading based on 1987 PPPURG, and earthquake dynamic loading used a variety of response spectrum procedure analysis based on SNI 03-1726-2012. Structural analysis was assumed to be the strong column weak beam concept. From the results of calculations, it is found that the steel portal structures (with and without braces) designed based on allowable interstory drift limits have met the requirements. The performance level of the steel portal structure without bracing was LS, while the performance level of the steel portal structure using bracing was IO. The largest amount of steel used in terms of weight was found in the case of a portal without braces.

Comparison between fixed base and isolated base in seismic response of high-rise buildings: a case study

2020 ◽  
Vol 6 (4) ◽  
pp. 204
Author(s):  
Anas M. Fares
Keyword(s):  
Response Spectrum ◽  
Soft Soil ◽  
Structural Response ◽  
Time History ◽  
Soil Condition ◽  
Soil Conditions ◽  
Spectral Acceleration ◽  
Base Shear ◽  
High Rise ◽  
Fixed Base

In this study, the influence of soil condition under the isolated and fixed bases is studied by using ETABS 16 software for the high-rise regular building. A regular building with 10 floors is modeled and the results are obtained for story displacements, story shear forces and spectral acceleration according to Uniform Building Code 97 (UBC-97) code. The time history analysis has been performed by using 1999 Izmit earthquake record. 3 types of soil which had different stiffnesses are considered in this study. The results show that the value of base shear increases when the soil stiffness decreases. It also noticed that the spectral acceleration is larger in soft soil condition than that of other soil conditions; and this confirms that the structural response spectrum is associated with the soil condition. In addition, when using base isolated building the drift of lower floors will be larger than that of using base isolated, but in the upper floors the drifts of fixed base building will be larger than that of the isolated base building. Finally, time history method in the seismic design will produce base shear less than that from equivalent static method, so calibration factor for design purpose shall be used.

scholarly journals The effect of seismic base isolation on structural response of a 12-story hotel building in Padang, Indonesia

2020 ◽  
Vol 156 ◽  
pp. 05026
Author(s):  
Fauzan ◽  
Afdhalul Ihsan ◽  
Mutia Putri Monika ◽  
Zev Al Jauhari
Keyword(s):  
Base Isolation ◽  
Response Spectrum ◽  
Soft Soil ◽  
Structural Response ◽  
Time History ◽  
Seismic Zone ◽  
Isolation System ◽  
Rubber Bearing ◽  
Seismic Base Isolation ◽  
The City

The amount of potential investment in Padang City, Indonesia since 2017 attracted many investors to contribute to the city. One of the investments is a 12-story hotel that will be constructed in By Pass Street of the city. The hotel is located in a high seismic zone area, so the seismic base isolation has been proposed to be used in the hotel building. The main aim of using a seismic base isolation device is to reduce the inertia forces introduced in the structure due to earthquakes by shifting the fundamental period of the structure out of dangerous resonance range and concentration of the deformation demand at the isolation system. An analytical study on the Reinforced Concrete (RC) hotel building with and without rubber bearing (RB) base isolation is carried out using the response spectrum and time history analysis methods. The results show that internal forces and inter-story drift of the building with high damping rubber bearing (HDRB) are lower than that of the fixed base with a remarkable margin. From this study, it is recommended to use the HDRB base isolation for medium and high rise buildings with soft soil in Padang City, Indonesia.

scholarly journals Evaluasi Kesehatan Struktur Bangunan berdasarkan Respon Dinamik Berbasiskan Data Akselerometer

2017 ◽  
Vol 23 (2) ◽  
pp. 142
Author(s):  
Wan Fikri Darmawan ◽  
Reni Suryanita ◽  
Zulfikar Djauhari
Keyword(s):  
Pushover Analysis ◽  
Damage Index ◽  
Time History ◽  
Frame Structure ◽  
Accelerometer Data ◽  
Building Structures ◽  
Element Analysis ◽  
Earthquake Load ◽  
Damage Condition ◽  
A Minor

The aim of the research is to analysis the health of a simple frame structure based on accelerometer data. The research is a preliminary study which used the accelerometer data in the time history analysis of the structure. The parameters has been used in the study are the Story Damage Index (SDI), the ApproximateStory Damage Index (ASDI), the Flexibility Damage Index (MFDI), and the Park Ang Damage Index. The finite element analysis is used to identify the damage of building structures through the pushover analysis. The study has conducted the minor damage index, physical appearance to check the cracked beam andconcrete column. The damage index average is in the range 0-0.08. It can be concluded the building is still able to withstand the earthquake load. However, the building is stated in a minor damage condition after the earthquake occurred.

Seismic Response Analysis on Flat L-Shaped Frame Structure Based on FEM

2012 ◽  
Vol 166-169 ◽  
pp. 2138-2142
Author(s):  
Hui Min Wang ◽  
Liang Cao ◽  
Ji Yao ◽  
Zhi Liang Wang
Keyword(s):  
Seismic Response ◽  
Three Dimensional ◽  
Time History ◽  
Frame Structure ◽  
Response Analysis ◽  
Reinforced Concrete Frame ◽  
Seismic Response Analysis ◽  
Concrete Frame ◽  
History Analysis ◽  
Complex Features

For the complex features in the form of a flat L-shaped reinforced concrete frame structure, the three dimensional FEM model of the structure was established in this paper, and the dynamic characteristics of the structure was analyzed, the participation equivalent mass of every mode’s order was obtained. Seismic response analysis for the structure was carried out with modal decomposition spectrum method and time history analysis method, the weak layer of the structure was pointed out and the reference for the structural design was provided.

Study on Seismic Performance of Reinforced Concrete Masonry High-Rise Building

2012 ◽  
Vol 166-169 ◽  
pp. 2164-2170
Author(s):  
Xu Jie Sun ◽  
Hou Zhang ◽  
Da Gang Lu ◽  
Feng Lai Wang
Keyword(s):  
Reinforced Concrete ◽  
Response Spectrum ◽  
Pushover Analysis ◽  
Time History ◽  
Time History Analysis ◽  
Masonry Building ◽  
Analysis Method ◽  
Concrete Masonry ◽  
History Analysis ◽  
Earthquake Action

The design process of the 100 m high reinforced concrete masonry building in China was firstly presented, deformation check calculation under earthquake action by mode-superposition response spectrum method and time-history analysis method were detailed and deformation under wind load was also checked. Then elastic-plastic deformation under earthquake action was checked by time-history analysis method and pushover analysis method with both under uniform load and reverse triangle load. The conclusion is construct 100 m high office building built in Fortification intensity 6 by reinforced concrete masonry is feasible. Then the building was redesigned as built in fortification 7, the same check was performed as that have been done in fortification 6, it is feasible too.

Dynamic Nonlinear Analysis of an Out-of-Code Highrise Building

2012 ◽  
Vol 594-597 ◽  
pp. 860-868
Author(s):  
Kai Hu ◽  
Ge Qu
Keyword(s):  
Nonlinear Analysis ◽  
Seismic Performance ◽  
Spectrum Analysis ◽  
Response Spectrum ◽  
Pushover Analysis ◽  
Time History ◽  
Response Spectrum Analysis ◽  
High Rise ◽  
History Analysis ◽  
Dynamic Nonlinear Analysis

The most common analysis methods of complex high-rise buildings are the response spectrum analysis, elastic time history analysis, pushover analysis and etc. Meanwhile, for the analysis of those high-rises whose height is higher than 200 meters, period is longer than 4 seconds, the dynamic nonlinear analysis would be more accurate. In this paper, the dynamic nonlinear analysis was executed in use of the Perform-3D program. The results show that the maximum top displacement can meet the national codes; most tie beams and the frame beams of the upper structure yielded in the IO~IS stage and parts reached the CP stage; both the laminated columns and the frame columns had a good performance on the shear behavior; and it is also proposed to strengthen the reinforcement at the reducted storeys. By all these above, it can be judged that the structure reached the codes’ seismic performance objectives.

Modal Superposition Technique to Predict the Seismic-Pushover Load for Jacket-Type Structures

2002 ◽  
Author(s):  
Kanthi Srirengan ◽  
Partha Chakrabarti ◽  
Rupak Ghosh
Keyword(s):  
Response Spectrum ◽  
Pushover Analysis ◽  
Time History ◽  
Nonlinear Time History Analysis ◽  
Elastic Response ◽  
Preliminary Evaluation ◽  
Inelastic Behavior ◽  
Linear Superposition ◽  
Linear Elastic ◽  
Nonlinear Time History

Two novel methods namely the Dominant Modes method and the All Modes method to predict the seismic-pushover load for the jacket-type structures are presented. Both of these methods are based on the linear superposition of the modal reactions. As a preliminary evaluation, the linear elastic response of a jacket structure subjected to seismic-pushover loads is compared with that obtained from the response spectrum analysis. Furthermore, the nonlinear inelastic behavior obtained from the seismic-pushover analysis is compared with that obtained from the nonlinear time-history analysis, for a portal frame subjected to El Centro earthquake motion. When more than one mode is dominant in an excitation direction, both the linear elastic and the nonlinear inelastic responses obtained using the loads generated from the All Modes method are representative of the reference solutions.

Study on Seismic Safety Evaluation of RCC Gravity Dam Based on Strength

2014 ◽  
Vol 501-504 ◽  
pp. 1493-1497
Author(s):  
Shu He Wang ◽  
Ji Yuan ◽  
Rui Guo Ma ◽  
Ju Bing Zhang
Keyword(s):  
Finite Element ◽  
Response Spectrum ◽  
Three Dimensional ◽  
Safety Evaluation ◽  
Time History ◽  
Element Model ◽  
Gravity Dam ◽  
Seismic Safety ◽  
Finite Element Software ◽  
Three Dimensional Finite Element

According to No.3 dam section of Dahuaqiao gravity dam, a three-dimensional finite element model is built by finite element software ANSYS. Mechanics of materials method, response spectrum method and time history analysis method are employed to analyze the strength of the dam section. Results show that the stress of dam toe, dam heel and downstream fold slope are relatively high and stress concentration emerges in those positions. The phenomenon indicates that these areas are vulnerable under the earthquake and precautions must be taken. But under the designed earthquake, the maximum stress of the dam section is below the allowable stress, representing the dam is in a safe state and the strength requirement is satisfied.

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