scholarly journals Application of Seismic Resisting Systems for Building Construction in Malaysia

2019 ◽  
Vol 8 (2S2) ◽  
pp. 71-75
Keyword(s):  
Structure Type ◽  
Reduction Factor ◽  
Design System ◽  
Seismic Load ◽  
Live Load ◽  
Foundation Soil ◽  
Braced Frame ◽  
Response Reduction Factor ◽  
Load Intensity ◽  
Node Displacement

Over the centuries, there has been a lot of earthquakes occur due to sudden changes in the surface of the earth. This phenomenon has caused property destruction, a large number of deaths and damage to buildings. This situation has become a concern by experts, especially engineers around the world since the damage of the building caused huge losses as well as contributing to the loss of life due to burial and so forth. Therefore, this study is conducted to compare the changes of node displacement that occur in each designed buildings caused by the seismic load applied and to determine the best design system that has the smallest amount of node displacement changes during the quake. In this study, three types of model that consist of base frame, shear wall and braced frame are designed using STAAD Pro Software to obtain their displacement reading. Important data such as seismic parameters and load cases which is Zone factor: 0.24, Response reduction factor: 5, Importance factor: 1.5, Structure type: Concrete, Damping: 0.05, Foundation soil type: Medium, Dead load intensity at all floor levels: 6kN/m2 , Live load for roof: 1.5kN/m2 and Live load for other floors: 3kN/m2 are inserted. The strength of resistance toward seismic load between the three models can be evaluated through the displacement occurs in the nodes in every model.

Efficacy of Importance Factor in Seismic Design of Indian Buildings

2016 ◽  
Vol 857 ◽  
pp. 71-75
Author(s):  
V. Sukumar ◽  
J. Arunachalam ◽  
D.C. Haran Pragalath
Keyword(s):  
Seismic Design ◽  
Reduction Factor ◽  
Seismic Load ◽  
Base Shear ◽  
Public Buildings ◽  
Response Reduction Factor ◽  
Rc Frames ◽  
Time Period ◽  
Importance Factor ◽  
Load Evaluation

At present, seismic load evaluation for design of Indian buildings are carried out using Indian seismic code. In which, building Time period, Response Reduction factor and Importance factor alters design base shear majorly. Currently IS code defines Importance factor differently as “1” for general buildings and “1.5” for public buildings. This factor makes public buildings as heavier sections as it increases design base shear. However there are no evidence that, how this importance factor affects/alters/improves the seismic behavior of buildings. In this present study, four storey RC frames are designed with different importance factors. Pushover analyses are carried out to find its effects on over strength factor and response reduction factor.

Investigation on Buckling Behavior of Cylindrical Liquid Storage Tanks Under Seismic Loading: 3rd Report — Proposed Design Procedure Considering Dynamic Response Reduction

2003 ◽  
Author(s):  
Akihisa Sugiyama ◽  
Koji Setta ◽  
Yoji Kawamoto ◽  
Koji Hamada ◽  
Hideyuki Morita ◽  
...  
Keyword(s):  
Dynamic Response ◽  
Seismic Loading ◽  
Absorption Capacity ◽  
Reduction Factor ◽  
Storage Tanks ◽  
Energy Absorption Capacity ◽  
Design Guideline ◽  
Response Reduction Factor ◽  
Liquid Storage ◽  
Thin Walled

As for thin walled cylindrical liquid storage tanks in nuclear power plants, the current elastic design guideline against seismic loading might result in too conservative component design as compared with elasto-plastic design in general industries. Therefore, it is thought possible to make the design guideline more reasonable by taking dynamic response reduction into account. In this series of study, experiments using scaled models were carried out, and seismic behavior of thin walled cylindrical liquid storage tanks was simulated to investigate energy absorption capacity and seismic resistance of those tanks. In this 3rd report of series of studies, seismic behavior of tanks was simulated to estimate a dynamic response reduction factor. This factor is based on the energy absorption capacity of structures. Through experiments and numerical study, a response reduction factor to design thin walled cylindrical liquid storage tanks has been proposed.

A Load Combination Method for Aseismic Design of Multiple Supported Piping Systems

1989 ◽  
Vol 111 (1) ◽  
pp. 10-16 ◽  
Author(s):  
K. Suzuki ◽  
A. Sone
Keyword(s):  
Structural Model ◽  
Response Spectrum ◽  
Reduction Factor ◽  
Combination Method ◽  
Piping System ◽  
Response Reduction Factor ◽  
Load Combination ◽  
Combination Scheme ◽  
Piping Systems ◽  
Reduction Effect

A new load combination scheme for seismic response calculation of piping systems subjected to multiple support excitations is presented. This scheme has an advantage, such that the cross-correlation among support excitations are properly taken into account by use of a stationary random vibration approach. The authors also present the idea of generating a “multi-excitation floor response spectrum.” First, using a simple analytical SDOF piping system to two support excitations and a simple Z-shaped piping model for shaking test, the combination law is supplied to various correlation cases of two support excitations and the maximum responses of piping in a fundamental mode is calculated. Second, nonlinear characteristics such as gap and friction appearing between piping itself and supports are specifically investigated. The response effect due to these nonlinearities is evaluated by the results through the shaking test with a piping-support structural model, and the amount of response reduction effect is represented by “a response reduction factor β.”

Prediction of floor responses to crowd bouncing loads by response reduction factor and spectrum method

2020 ◽  
pp. 136943322097556
Author(s):  
Jun Chen ◽  
Jingya Ren ◽  
Vitomir Racic
Keyword(s):  
Structural Damage ◽  
Response Spectrum ◽  
Field Measurements ◽  
Reduction Factor ◽  
Response Reduction Factor ◽  
Long Span ◽  
Single Person ◽  
Vibration Serviceability ◽  
Concert Halls ◽  
Structural Responses

Bouncing is a typical rhythmic crowd activity in entertaining venues, such as concert halls and stadia. When the activity’s frequency is close to the natural frequency of the occupied structure, the corresponding bouncing loads can cause intense structural vibrations resulting in vibration serviceability problems, even structural damage. This study suggests a method for prediction of vibration response due to crowd bouncing by a response reduction factor (RRF) in conjunction with a previously established response spectrum approach pertinent to a single person bouncing. The RRF is defined as a ratio between structural responses with and without taking into account synchronization of body movements of individuals in a bouncing crowd. The variations of RRF with number of persons, structural frequency, bouncing frequency and structural damping ratios have been studied using experimental records of crowd bouncing loads. Based on the findings a practical design curve for RRF has been proposed. Application of the proposed method has been validated on numerical simulations and field measurements of a long-span floor subjected to crowd bouncing loads.

Evaluation of response reduction factor by pushover analysis

2018 ◽  
Vol 9 (2) ◽  
pp. 116
Author(s):  
Mayank Desai ◽  
Anurag Nambiar ◽  
Shefali Gahrana ◽  
Ronak Motiani ◽  
J.R. Kunal
Keyword(s):  
Pushover Analysis ◽  
Reduction Factor ◽  
Response Reduction Factor

A Load Combination Method for Seismic Design of Multiple Supported Piping Systems With Friction Characteristics: Part 1—Generally Correlated Excitations

2011 ◽  
Author(s):  
Tatsuya Yamauchi ◽  
Kazumasa Tsuchikawa ◽  
Arata Masuda ◽  
Akira Sone
Keyword(s):  
Cross Correlation ◽  
Reduction Factor ◽  
Combination Method ◽  
Piping System ◽  
Theory Approach ◽  
Friction Characteristics ◽  
Response Reduction Factor ◽  
Load Combination ◽  
Piping Systems ◽  
The Cross

A load combination method for seismic response calculation of piping systems with friction characteristics to multiple support excitations is presented. This method has an advantage, such that the cross-correlation among support excitations and “response reduction factor” due to friction are taken into account by use of a stationary random vibration theory approach. Using a simple analytical SDOF piping system with friction characteristics to two support excitations, This method is supplied to various correlation cases of two support excitations and friction characteristics and the maximum responses of piping is calculated. From these calculation results, it is clear that the maximum acceleration responses of nonlinear piping systems can also depend on the cross-correlation among support excitations and can be reduced due to the friction effect. Finally, the conventional equation of the response reduction factor and the maximum response calculated by the proposed method are presented for practical use.

Effect of foundation rocking on the seismic response of shear walls

2003 ◽  
Vol 30 (2) ◽  
pp. 360-365 ◽  
Author(s):  
Donald L Anderson
Keyword(s):  
Shear Walls ◽  
Shear Wall ◽  
Reduction Factor ◽  
Foundation Soil ◽  
Soil Response ◽  
Minimum Reinforcement ◽  
Seismic Shear ◽  
Fixed Base ◽  
R Value ◽  
Lift Off

Some designers have long known that elastically responding shear-wall or core-wall type high-rise structures will not overturn if the footing size is smaller than that required to resist the elastic forces. Most shear walls are designed and built with a yield hinge mechanism at the base using a relatively high value of the force reduction factor R, and the foundation should be stronger than the yield hinge strength if the wall is to perform as designed. Many walls, however, built with R = 2 are stronger than they need to be because of reasons such as architectural sizing and minimum reinforcement requirements. If for these cases the foundation is to be stronger than the wall, then it will in effect be designed for forces corresponding to an R value of <2. This study looks at the effect on the displacement of a shear-wall type structure if the footing is allowed to rock. The structure is kept elastic and the footing is sized to correspond to R values ranging from 1.0 to 3.5. The analysis uses gap elements to model the foundation soil response so that the footing can lift off the soil. Soil stiffness and strength are modelled for a rock and a firm clay site. The response of 7-, 15-, and 30-storey structures to 11 different acceleration records, modified to match a spectrum given in the 1995 National Building Code of Canada (NBCC) for Vancouver, is determined for the different footing dimensions. The results indicate that a footing sized for an R value of 2 does not result in a significant increase in displacement when compared with the fixed base elastic case. In the next version of the NBCC it is suggested that footings need not be designed for forces corresponding to R < 2.Key words: seismic shear walls, overturning, liftoff, rocking footings.

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