scholarly journals Influence of structural irregularities on seismic performance of RC frame buildings

2021 ◽  
Vol 1 (1) ◽  
pp. 70-87
Author(s):  
Krishna Ghimire ◽  
Hemchandra Chaulagain
Keyword(s):  
Seismic Vulnerability ◽  
Time History ◽  
Frame Structure ◽  
Rc Frame ◽  
Building Structures ◽  
Functional Requirements ◽  
Finite Element Program ◽  
Element Program ◽  
Rc Frame Buildings ◽  
Structural Irregularities

Irregular building structure is frequently constructed across the globe for fulfilling aesthetic as well as functional requirements. The structures with irregularities are the common building type in earthquake-prone country like Nepal. However, a post-earthquake reconnaissance survey reports revealed the high seismic vulnerability of the building with structural irregularities. In this context, the present study explores the influence of structural irregularities on performance of reinforced concrete (RC) frame structure. To this end, the structural irregularities are created in in the building structures. The geometrical irregularities are created by removing the bays in different floor levels. Likewise, the effect due to mass irregularities are studied by considering the swimming pool and game house at different floor levels. Furthermore, the stiffness irregularities are formulated by removing the building columns at different sections. All these irregularities are studied analytically in finite element program with 3-D structural models. The numerical analysis is done with non-linear static pushover and time history analysis. The results are analyzed in terms of fundamental time period, storey shear, storey displacement, drift and overturning moment. The results indicate that the level of irregularities significantly influenced the behavior of structures.

scholarly journals Common irregularities and its effects on reinforced concrete building response

2021 ◽  
Vol 17 (1) ◽  
pp. 63-73
Author(s):  
Krishna Ghimire ◽  
Hemchandra Chaulagain
Keyword(s):  
Reinforced Concrete ◽  
Seismic Vulnerability ◽  
Numerical Models ◽  
Time History ◽  
Functional Requirements ◽  
Finite Element Program ◽  
Reinforced Concrete Building ◽  
Concrete Building ◽  
Element Program ◽  
Dynamic Time

In most of the countries, the irregular building construction is popular for fulfilling both aesthetic and functional requirements. However, the evidence of past earthquakes in Nepal and the globe demonstrated the higher level of seismic vulnerability of the buildings due to irregularities. Considering this fact, the present study highlighted the common irregularities and its effect on reinforced concrete building response. The effect of structural irregularities was studied through numerical analysis. The geometrical, mass and stiffness irregularities were created by removing bays in different floor levels and removing the columns at different sections respectively. In this study, the numerical models were created in finite element program SAP2000. The structural performance was studied using both non-linear static pushover and dynamic time history analysis. The results indicate that the level of irregularities significantly influenced the behavior of structures.

scholarly journals Performance of RC frame structure with various beam to column flexural capacity ratio – a case study

2017 ◽  
Vol 4 ◽  
pp. 17-23
Author(s):  
Sudip Karanjit
Keyword(s):  
Failure Mechanism ◽  
Frame Structure ◽  
Gradual Change ◽  
Rc Frame ◽  
Building Structures ◽  
Flexural Capacity ◽  
Gradual Improvement ◽  
Capacity Curve ◽  
Frame Buildings ◽  
Rc Frame Buildings

The effectiveness of various Strong Column Weak Beam (SCWB) factors to enhance seismic performance is assessed for Reinforced Concrete (RC) frame building structures. In this study five RC frame buildings of different storey numbers have been analysed using different column overdesign factors. The results are compared as the influence of various SCWB factor over the expected performance of selected RC frame buildings in terms of enhancement in capacity and failure mechanism. With the lower value of SCWB factor insignificant change in capacity curve is observed while gradual improvement is observed with the higher factors. In terms of failure mechanism gradual change from column failure mechanism to beam failure is observed but the hinge formation at the base of bottom storey column is seen even with the higher value of SCWB factor. The effectiveness of alternative method of column flexural capacity enhancement by proposed modified SCWB (MSCWB) was also studied. MSCWB is found to be more effective in terms of enhancement in capacity curve and failure mechanism.

scholarly journals Response of a C-Shaped Building Under Blast Loadings

2019 ◽  
Vol 8 (2S8) ◽  
pp. 1012-1016
Keyword(s):  
Comparative Study ◽  
Research Work ◽  
Blast Load ◽  
Building Structures ◽  
Finite Element Program ◽  
Building Model ◽  
Element Program ◽  
Live Loads ◽  
Triangular Function ◽  
The Comparative Study

Our structures especially building structures, are designed basically for dead loads, live loads for static loading conditions and for wind, earthquake and their combinations for dynamic lateral loadings. As the structures are not designed for unexpected blast load conditions it is not possible for the structures to resist such destructive forces of blast impacts. In this research work a comparative study has been done for the blast forces and earthquake forces. For this study purpose a C-shaped building was modelled for the analysis in finite element program SAP-2000. Initially the building model was analysed for Dead loads, live loads and Earthquake loads. In the second model the building is designed for Blast load. Blast load was defined as a triangular function using codal provisions suggested by IS-4991. The results then are compared and it was checked how far a building designed for EQ can withstand a blast of specific amount of TNT. Also the effect of blast forces due to shape of the building is checked. The comparative study has been mapped and indicated in the paper.

Nonlinear Analysis of a RC Frame Structure with Semi-Interlayers Damaged during Wenchuan Earthquake

2010 ◽  
Vol 156-157 ◽  
pp. 467-472
Author(s):  
Peng Tao Yu ◽  
Jing Jiang Sun
Keyword(s):  
Nonlinear Analysis ◽  
Wenchuan Earthquake ◽  
Time History ◽  
Large Earthquake ◽  
Frame Structure ◽  
Nonlinear Time History Analysis ◽  
Frame Structures ◽  
Rc Frame ◽  
Rc Frame Structures ◽  
Nonlinear Time History

Under the excitation of large earthquake, structures enter into high nonlinear stage. Currently, Opensees, Perform-3d and Canny are used as the most popular nonlinear analysis procedures. The fiber model will be introduced firstly and the nonlinear analysis models in Canny are explained in detail. Then Canny2007 is used to conduct nonlinear time history analysis on a heavily damaged frame structure with interlayer in Dujiangyan during Wenchuan Earthquake. Analysis shows that the maximum inter-story drift appears between the interlayer and its upper layer, and the heavy damage agrees well with the results of damage investigation. By comparing the damage extent of frame structures with or without interlayer, it reveals that the seismic performance of RC frame structures without interlayer is obviously better than that of ones with interlayer.

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.

The Influence Analysis of Mechanical Behavior between Pile and Soil on End Bearing Pile Foundation’s Dynamic Characteristic

2014 ◽  
Vol 580-583 ◽  
pp. 1481-1485
Author(s):  
Wei Hu ◽  
Ya Hui Zhang ◽  
Ying Zhang
Keyword(s):  
Mechanical Behavior ◽  
Structural Model ◽  
Ground Surface ◽  
Time History ◽  
Horizontal Displacement ◽  
Shearing Stress ◽  
Maximum Acceleration ◽  
Finite Element Program ◽  
Element Program ◽  
End Bearing Pile

Dynamic structural model of saturated soil was introduced, and combining with the finite element program, the finite-infinite element models of end bearing pile foundations was established. Four models of interface between pile and soil including absolutely jointed, slippage, crack, both slippage and crack were considered to study the interface’s effect on pile foundation’s dynamic characteristics. The results were as follows: the interface’s mechanical behavior has a little influence on the distributions of pile section’s shearing stress and horizontal displacement. Pile section’s shearing stress reaches the maximum near the ground surface when interface is slippage or crack, and reaches the minimum ones when interface is absolutely jointed. Horizontal displacement could be divided into two phases and the ground surface is the dividing line. The interface’s behavior greatly changes the distribution of acceleration time-history curve. To different models, the maximum acceleration all appears at the ground surface. On the whole, the interface’s behavior has significant influence on end bearing pile, which should be pay attention in the design from now on.

Behavior of Concrete as a Barrier Material for Nuclear Waste Disposal

1989 ◽  
Vol 176 ◽  
Author(s):  
R. J. James ◽  
Y. R. Rashid
Keyword(s):  
Constitutive Model ◽  
Material Property ◽  
Nuclear Waste ◽  
Waste Disposal ◽  
Elevated Temperatures ◽  
Nuclear Waste Disposal ◽  
Functional Requirements ◽  
Barrier Material ◽  
Finite Element Program ◽  
Element Program

SummaryThe foundation necessary for a constitutive model to simulate the response of concrete at elevated temperature has been presented. A model including temperature dependent creep, material property degradation, and cracking is needed to evaluate the long term functional requirements of concrete as a barrier material for nuclear waste disposal. Since the stress due to thermal load is proportional to the modulus, the degradation of the modulus with time even at constant elevated temperatures requires continual redistribution of load. Furthermore, since this degradation is not recoverable, the response of the material at elevated temperatures exhibits a complex dependence not only on the temperature distribution, but on the prior thermal history of the structure.This constitutive model for the response of concrete at elevated temperatures has been implemented into an implicit, finite element program called ANACAP [8]. Because of the direct coupling with temperature, both through thermal loads and material property dependency, ANACAP also contains a heat transfer module that includes thermal effects due to fluid flow and moving material boundaries. This program has been applied to problems involving underground waste storage tanks and grout vaults at the DOE Hanford site in Richland, Washington.

Inter-Story Capacity Spectrum for the Performance Based Seismic Design of Vertically Irregular RC Frame Structures II: Examples

2012 ◽  
Vol 517 ◽  
pp. 749-754
Author(s):  
Jin Jie Men ◽  
Qing Xuan Shi ◽  
Qi Zhou
Keyword(s):  
Time History ◽  
Earthquake Hazard ◽  
Frame Structure ◽  
Rc Frame ◽  
Direct Displacement Based Design ◽  
Capacity Spectrum ◽  
Story Drift ◽  
Performance Based Seismic Design ◽  
Hazard Level ◽  
Rc Frame Structures

The procedure to establish the inter-story capacity spectrum method is explained detailedly in partⅠ. In this part examples are presented to demonstrate the applicability and utility of the proposed method. It is shown that the vertically irregular RC frame structure can be directly designed with the methodology proposed in this work. It is also concluded that the new method can control the inter-story drift, the order and position of hinges of vertically irregular structures under different earthquake hazard level. Comparing to time history analysis method, it leans to cautious and is superior to direct displacement-based design (DDBD).

Time-History Analysis of the High-Rise Building Structure Based on ANSYS

2011 ◽  
Vol 71-78 ◽  
pp. 2836-2839
Author(s):  
Hui Xia Xiong ◽  
Chang Yong Wang
Keyword(s):  
Structural Design ◽  
Time History ◽  
Time History Analysis ◽  
Building Structure ◽  
Finite Element Program ◽  
High Rise ◽  
High Rise Building ◽  
History Analysis ◽  
Earthquake Load ◽  
Element Program

The dynamic property of a high-rise building structure and time-history analysis under earthquake were analyzed by using the finite element program ANSYS. A modal analysis of the tower was conducted and the first 20 frequencies and modal shapes were obtained. The displacements and inner force under the earthquake were calculated. The result showed that the structural stiffness was enough to sustain earthquake load; and the stiffness distributed equally. These results can provide reliable basis for structural design.

scholarly journals Design Analysis of Overhead Crane for Maintenance Workshop

2018 ◽  
Vol 207 ◽  
pp. 02003
Author(s):  
Siva Sitthipong ◽  
Chaiyoot Meengam ◽  
Suppachai Chainarong ◽  
Prawit Towatana
Keyword(s):  
Finite Element ◽  
Steel Structure ◽  
Design Analysis ◽  
Overhead Crane ◽  
Functional Requirements ◽  
Finite Element Program ◽  
Fishing Boat ◽  
Element Program ◽  
Reinforced Steel ◽  
Beam Bridge

This research aimed to study the design of the overhead crane of a small fishing boat maintenance factory according to the building and functional requirements of the project based on the ASME B30.2-2005 Standard. The results of the study showed that the design of the runway with steel structure BS: 5950: 2000 grade s460 provided vertical and horizontal deflection values of 4.96 and 16.62 respectively that did not exceed the allowed deflection. It is strong enough for use in construction when the stresses on the beam bridge were analysed by the finite element program compared with the strength of the reinforced steel providing a safety value of 1.83.

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