Procedural Assumption Comparison for Old Buildings via Pushover Analysis Including the ASCE 41 Update

2010 ◽  
Vol 26 (1) ◽  
pp. 187-208 ◽  
Author(s):  
Georgios Siahos ◽  
Stephanos Dritsos
Keyword(s):  
Plastic Hinge ◽  
Pushover Analysis ◽  
Performance Level ◽  
Safety Performance ◽  
Rc Buildings ◽  
Dynamic Analyses ◽  
Fema 356 ◽  
Nonlinear Dynamic Analyses ◽  
Seismic Tests ◽  
Story Building

The two different procedures of ASCE/SEI 41 Supplement 1 and the EC 8 based Greek Retrofitting Code (GRECO) are compared via pushover analyses for the seismic assessment of RC buildings designed to old codes. In addition, the FEMA 356 procedure is considered in order to evaluate the new provisions of ASCE/SEI 41. Results from two moderate level seismic tests performed on a four-story building are used for comparison. For the first test, all procedures overestimated the experimentally observed limited damage but GRECO was more satisfactory. For the second higher excitation test, all procedures predicted the building's high vulnerability but failed to predict the experimentally observed imminent collapse of a stiff column. In all cases, GRECO gave higher displacements. ASCE/SEI 41 and FEMA 356 predicted better the building's stiffness and gave much higher available plastic hinge rotations for beams when compared to GRECO. Concerning the columns, available plastic hinge rotations at the Life Safety performance level from the ASCE procedure were higher than GRECO, while ASCE values at the collapse prevention performance level were slightly lower than GRECO. Finally, a comparison of the above procedures with nonlinear dynamic analyses of a past earthquake is performed to identify potential pushover analysis concerns.

scholarly journals EVALUASI STRUKTUR GEDUNG DUAL SYSTEM DENGAN DINDING GESER BERSAYAP C MENGGUNAKAN PUSHOVER ANALYSIS

2020 ◽  
Vol 3 (4) ◽  
pp. 1233
Author(s):  
Albert Albert ◽  
Daniel Christianto ◽  
Hadi Pranata
Keyword(s):  
Line Element ◽  
Pushover Analysis ◽  
Safety Performance ◽  
Life Safety ◽  
Target Displacement ◽  
Uniform Load ◽  
Load Pattern ◽  
Fema 356 ◽  
Strength And Stiffness ◽  
Equivalent Strength

ABSTRACTAlthough elastic analysis gives a good indication of the elastic capacity and behavior of a building, but the elastic method can’t predict when the first yield will occur, and the failure mechanism and account for redistribution of member forces when the plastic hinges progressively formed. The use of inelastic procedure for evaluation is an attempt made by engineer in the past days to better understand how the structure will behave when subjected to strong earthquake, assuming the elastic capacity of the structure will be exceeded. In this research the pushover analysis was done using the modelling criteria of FEMA 356. The modeling of C-flanged shear was done using line element with the equivalent strength and stiffness properties. Target displacement was calculated using the displacement coefficient method of FEMA 356. Based on the analysis the triangular load pattern resulted in larger target displacement than the uniform load. But the uniform load pattern gives larger seismic response than the triangular load pattern. The uniform load pattern resulted in Life Safety performance level, while the triangular load pattern resulted in Immediate Occupancy, based on the two load patterns used the structure resulted in Life Safety performance level.ABSTRAKWalaupun analisis elastik memberikan indikasi yang baik mengenai kapasitas dan perilaku elastik dari suatu gedung, tetapi metode elastik tidak dapat memperkirakan kapan pelelehan pertama terjadi, serta mekanisme kegagalan apa yang mungkin terjadi pada bangunan tersebut, dan memperkirakan redistribusi dari gaya- gaya dalam ketika pembentukan sendi plastis secara progresif terjadi. Fungsi dari analisis inelastik, sebagai prosedur untuk mengevaluasi bangunan, yang merupakan usaha dari insinyur-insinyur terdahulu memahami bagaimana struktur akan berperilaku apabila dikenai gempa kuat, dimana diasumsikan bahwa kapasitas elastik gedung telah terlampaui. Dalam penelitian ini dilakukan pushover analysis menggunakan kriteria pemodelan berdasarkan FEMA 356. Pemodelan dari dinding geser bersayap C dilakukan menggunakan line element dengan kekuatan dan kekakuan yang ekivalen. Target perpindahan dianalisis menggunakan metode coefficient of displacement dari FEMA 356. Berdasarkan analisis yang dilakukan didapat bahwa pembebanan segitiga lebih besar dibandingkan pembebanan merata. Namun, respons seismik yang didapat akibat beban merata, lebih besar dibandingkan beban segitiga. Pembebanan merata menghasilkan tingkatan kinerja Life Safety, sedangkan pembebanan segitiga menghasilkan tingkatan kinerja Immadiate Occupancy, berdasarkan kedua pembebanan tersebut didapat kinerja dari struktur tersebut adalah Life Safety.

scholarly journals Pushover Analysis of Partially Strengthened Column Structures on an Existing Multi-story Building

2019 ◽  
Vol 280 ◽  
pp. 01003
Author(s):  
Mochamad Teguh ◽  
Novia Mahlisani ◽  
Fadillawaty Saleh
Keyword(s):  
Plastic Hinge ◽  
Pushover Analysis ◽  
Building Collapse ◽  
Column Structure ◽  
Significant Damage ◽  
Immediate Occupancy ◽  
Strength And Stiffness ◽  
Building Condition ◽  
Story Building

A pushover analysis was conducted to evaluate structuralperformance of an extended building structure subjected to simulatedseismic loads. The Inna Garuda Hotel was selected as a building object ofthis research focusing on the extension building only. This 7-storyreinforced concrete building has been functioned as a hotel building in theYogyakarta City of Indonesia for over 30 years. Preliminary results of thisanalysis indicated that the performance level of this building wascategorized as an immediate occupancy (IO), however, the plastic hingeson the slim column structure components occurred. Given this condition, the structure of the building does not fulfill the concept of a strong columnweakbeam (SCWB). The research objective is to follow up on thepotential of building collapse due to the column structure weakness byconducting a research on the strengthening of slim column elements. Apushover analysis was carried out using ETABS software. A strengtheningtechnique was adopted by enlarging the dimensions of the slim columngradually. In this study, the slim column was enlarged up to 300/650 mm(KJ-P5 model). The pushover analysis results of the KJ-P5 model haveshown the drift ratio is less than 1.0% for the four directions of thepushover with the level of immediate occupancy performance (IO). Referring to the recent building condition, the strengthened slim columnsdo not seem significant damage to the structural components of thebuilding resulting in a fulfilling of SCWB concept, where a similarcondition on their strength and stiffness as before the earthquake occurs. The results of the plastic hinge locations, as well as the performance levelsof the indicated slim columns in resisting overall structures, are extensivelydiscussed in this paper.

Robustness Based Structural Design: An Integrated Approach for Multi-Hazard Risk Mitigation

2011 ◽  
Vol 82 ◽  
pp. 770-777
Author(s):  
Dan Dubina ◽  
Florea Dinu
Keyword(s):  
Seismic Design ◽  
Structural Design ◽  
Risk Mitigation ◽  
Integrated Approach ◽  
Building Structures ◽  
Frame Buildings ◽  
Dynamic Analyses ◽  
Nonlinear Dynamic Analyses ◽  
Story Building ◽  
Multistory Frame

Multi-story building structures can suffer local damage or even structural collapse in case of extreme natural or man-made hazards. While all buildings are at a certain risk, some attributes can reduce the risk by reducing the vulnerability. One such attribute is the use of structural systems which can ensure that, in case of abnormal loads or failure of some elements, the collapse is prevented and the risk to occupants is reduced. Mitigation of some specific hazard can also help to reduce the risk, eg. protective barriers against impact or stand-off distance against direct effects of blast. Past experience has shown that structures that are designed according to seismic design philosophy can survive to a multiplicity of hazards. The objective of the paper is the adaptation of seismic design methodology to robust design demands of multistory frame buildings prone to multi-hazard scenarios. The hazard is modeled by removal of critical members. Nonlinear dynamic analyses are carried out in order to evaluate their robustness.

scholarly journals Role of Higher-“Mode” Pushover Analyses in Seismic Analysis of Buildings

2005 ◽  
Vol 21 (4) ◽  
pp. 1027-1041 ◽  
Author(s):  
Rakesh K. Goel ◽  
Anil K. Chopra
Keyword(s):  
Seismic Analysis ◽  
Plastic Hinge ◽  
Pushover Analysis ◽  
Moment Resisting Frame ◽  
Frame Buildings ◽  
Moment Resisting ◽  
Pushover Curve ◽  
Fema 356 ◽  
Direction Opposite

The role of higher-“mode” pushover analyses in seismic analysis of buildings is examined in this paper. It is demonstrated that the higher-“mode” pushover curves reveal plastic hinge mechanisms that are not detected by the first-“mode” or other FEMA-356 force distributions, but these purely local mechanisms are not likely to develop during realistic ground motions in an otherwise regular building without a soft and/or weak story. Furthermore, the conditions necessary for “reversal” of a higher-“mode” pushover curve are examined. It is shown that “reversal” in a higher-“mode” pushover curve occurs after formation of a mechanism if the resultant force above the bottom of the mechanism is in the direction that moves the roof in a direction opposite to that prior to formation of the mechanism. Such “reversal” can occur only in higher-“mode” pushover analyses but not in the pushover analyses for the first-“mode” or other FEMA-356 force distributions. However, the “reversal” in higher-“mode” pushover curves was found to be very rare in several recent investigations that examined behavior of many moment-resisting frame buildings. Included are guidelines for implementing the Modal Pushover Analysis for buildings that display “reversal” in a higher-“mode” pushover curve.

Seismic Capacity Requirements for Low-Rise Reinforced Concrete Buildings Comprised of Members Failing in Shear and in Flexure

2006 ◽  
Vol 324-325 ◽  
pp. 1289-1292
Author(s):  
K.S. Lee ◽  
Chang Sik Choi
Keyword(s):  
Structural Damage ◽  
Lateral Load ◽  
Seismic Evaluation ◽  
Rc Buildings ◽  
Seismic Capacity ◽  
Dynamic Analyses ◽  
Damage States ◽  
Well Damage ◽  
Interaction Curves ◽  
Nonlinear Dynamic Analyses

This paper presents a method for determining required shear and flexural strengths associated with structural damage states for various levels of earthquake demand of low-rise RC buildings having a dual lateral-load resisting system. The interaction curves of the required strengths are derived for various ductility ratios based on nonlinear dynamic analyses of the singledegree- of-freedom system. Damage states of buildings controlled by both shear and flexure are evaluated by the procedure outlined by the Japanese Standard. The proposed method predicts reasonably well damage sustained by actual buildings during an earthquake. The proposed method can be used to develop performance-based seismic evaluation and rehabilitation procedures of lowrise RC buildings having a dual lateral-load resisting system.

scholarly journals Seismic Performance Evaluation of Existing RC Buildings Without Seismic Details. Comparison of Nonlinear Static Methods and IDA

2016 ◽  
Vol 10 (1) ◽  
pp. 158-179 ◽  
Author(s):  
Constantinos C. Repapis
Keyword(s):  
Seismic Performance ◽  
Nonlinear Dynamic ◽  
Pushover Analysis ◽  
Strong Motion ◽  
Rc Buildings ◽  
Mean Values ◽  
Behaviour Factor ◽  
Seismic Performance Evaluation ◽  
N2 Method ◽  
Dynamic Analyses

The inelastic response of existing reinforced concrete (RC) buildings without seismic details is investigated, presenting the results from more than 1000 nonlinear analyses. The seismic performance is investigated for two buildings, a typical building form of the 60s and a typical form of the 80s. Both structures are designed according to the old Greek codes. These building forms are typical for that period for many Southern European countries. Buildings of the 60s do not have seismic details, while buildings of the 80s have elementary seismic details. The influence of masonry infill walls is also investigated for the building of the 60s. Static pushover and incremental dynamic analyses (IDA) for a set of 15 strong motion records are carried out for the three buildings, two bare and one infilled. The IDA predictions are compared with the results of pushover analysis and the seismic demand according to Capacity Spectrum Method (CSM) and N2 Method. The results from IDA show large dispersion on the response, available ductility capacity, behaviour factor and failure displacement, depending on the strong motion record. CSM and N2 predictions are enveloped by the nonlinear dynamic predictions, but have significant differences from the mean values. The better behaviour of the building of the 80s compared to buildings of the 60s is validated with both pushover and nonlinear dynamic analyses. Finally, both types of analysis show that fully infilled frames exhibit an improved behaviour compared to bare frames.

Seismic Performance of High Strength Reinforced Concrete Buildings Evaluated by Nonlinear Pushover and Dynamic Analyses

2016 ◽  
Vol 16 (03) ◽  
pp. 1450107 ◽  
Author(s):  
K. C. Lin ◽  
H. H. Hung ◽  
Y. C. Sung
Keyword(s):  
Reinforced Concrete ◽  
Seismic Performance ◽  
Failure Modes ◽  
Plastic Hinge ◽  
Pushover Analysis ◽  
High Strength ◽  
Nonlinear Time History Analysis ◽  
Lumped Mass ◽  
High Rise ◽  
Dynamic Analyses

This paper investigates the combined effect of flexural and shear actions on the failure modes of the high strength reinforced concrete (HRC) members using the proposed algorithm for plastic hinge formation. The accuracy of the present procedure for the HRC columns was verified by comparing the results obtained with those of the cyclic loading tests performed in Japan. To evaluate the seismic performance of the HRC high-rise buildings, a seismic performance checklist for the HRC buildings was recommended. Based on the proposed algorithm for formation of plastic hinges, the seismic performance of HRC buildings based on the static pushover analysis is evaluated. From the results of the pushover analysis, a simplified lumped-mass stick model was developed, which is adopted to evaluate the seismic performance using the nonlinear time history analysis. For the purpose of illustration, the seismic performance of a high-rise building constructed with HRC was investigated by both the nonlinear pushover and nonlinear dynamic analyses using the proposed procedure and concepts. The results of this paper serve as a useful reference for the seismic design and evaluation of HRC high-rise structures.

scholarly journals EVALUASI KINERJA STRUKTUR BANGUNAN MENGGUNAKAN PUSHOVER ANALYSIS DENGAN METODE ATC-40 DAN FEMA 356

Jurnal PenSil ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 40-46
Author(s):  
R. Hendarto Prasetyo R. Bambang Kusuma Prihadi ◽  
Dwi Kurniati ◽  
Bambang Kusuma Prihadi
Keyword(s):  
Lateral Displacement ◽  
Response Spectrum ◽  
Pushover Analysis ◽  
Performance Level ◽  
Performance Point ◽  
Drift Ratio ◽  
Load Pattern ◽  
Fema 356 ◽  
Immediate Occupancy ◽  
Collapse Behavior

Pushover analysis is a non-linear static analysis to determine the collapse behavior of a building or structure. The analysis is carried out by giving a static lateral load pattern to the structure, which is then gradually increased by a multiplier until a buliding movement target is reached. This final assignment research was conducted to determine the performance point based on ATC-40, to determine the performance level based on ATC-40, and to determine the performance level based on FEMA 356. The research method used the response spectrum with the SAP2000 v14 program. The result of the performance point in building with the values of Sa = 0,737, and Sd = 0,200 for the push X, while the values of push Y Sa = 0,680, and Sd = 0,225. The calculation of ATC-40 in building shows the value of the drift ratio in the X direction 0,01165 and the drift ratio Y direction 0,0127 at the level of performance Immediate Occupancy (IO). The result of FEMA 356 calculation in building shows the value of the lateral displacement target structure of the X direction structure = 0,00437 (0,437 %), and the value of the lateral displacement target of the Y direction structure = 0,006 (0,6 %) and at the level of performance Immediate Occupancy (IO). Then it could be concluded that The Dental & Mouth Hospital of UGM Prof. Soedomo, was at the level of performance Immediate Occupancy (IO), meaning that the building was still safe and could be reused after the earthquake and don’t occured serious demage.

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