scholarly journals Structural Pounding between Adjacent Buildngs during Earthquakes

2021 ◽  
Vol 7 (03) ◽  
pp. 142-150
Author(s):  
K Dada Hayath and Dr.C.Raja Ram
Keyword(s):  
Reinforced Concrete ◽  
Time History ◽  
Time History Analysis ◽  
Study Time ◽  
Rc Buildings ◽  
Land Area ◽  
Acceleration Response ◽  
Structural Pounding ◽  
History Analysis ◽  
Significant Damage

In India multi-storied buildings are usually constructed, due to high cost and scarcity of land inhabitant places. In order to utilize maximum land area, buildings are constructed generally asymmetrical plan and adjacent to each other. The reports after major earthquakes indicate that the earthquake induced pounding between insufficiently separated buildings may lead to significant damage or even total collapse of structure. This paper examines the collision between adjacent reinforced concrete (RC) buildings under earth- quakes. In this study, two buildings with equal heights, unequal heights are analyzed. To understand torsional behaviour of buildings due to pounding, torsional pounding effect is also considered. To per- form the above cases, the buildings are modeled in standard structural software (SAP2000). For the purpose of study, time history analysis is used. The results are shown in terms of pounding responses, acceleration response and pounding forces.

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.

The Comparative Analysis on Calculation Methods of Vertical Seismic Response to Suspended-Dome Structure

2013 ◽  
Vol 351-352 ◽  
pp. 849-853
Author(s):  
Lan Chen ◽  
De Long Lu ◽  
Xiao Gang Yin
Keyword(s):  
Response Spectrum ◽  
Time History ◽  
Seismic Effect ◽  
Time History Analysis ◽  
Vertical Acceleration ◽  
Analysis Method ◽  
Calculation Methods ◽  
Acceleration Response ◽  
History Analysis ◽  
Acceleration Response Spectrum

Based on the vertical seismic information, the vertical seismic response spectrum was calculated by Matlab Lsim function. The seismic effect of Kiewitt-Lamella suspended-dome was measured by dynamic to static ratio. According to the EL-Centro seismic wave, it analyzed and compared the dynamic to static ratios which were calculated by the following four vertical seismic calculation methods respectively: the simplified method of specification, the mode-superposition response spectrum methods based on the horizontal earthquake affecting coefficients and the vertical acceleration response spectrum respectively, and the time history analysis method. Analysis shows that: For the seismic effect, the time history analysis method is larger than the other three methods, and the method based on the vertical acceleration response spectrum is closer to the time history analysis method. Owing to large difference of the four methods for seismic effect, various methods should be adopted to ensure the safety of vertical seismic design.

Performance-Based Design and Table Test Study on Hybrid Structure Combined with outside Steel Grid and Inner Reinforced Concrete Tube

2014 ◽  
Vol 578-579 ◽  
pp. 106-112
Author(s):  
Zhi Zhong Guan ◽  
Jia Qi Ge ◽  
Bo Tao Ma ◽  
Ling Zhang ◽  
Ming Zhu Wang ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Structural Characteristics ◽  
Time History ◽  
Steel Structure ◽  
Hybrid Structure ◽  
Time History Analysis ◽  
Concrete Core ◽  
Test Study ◽  
History Analysis ◽  
Overall Stability

With the hybrid structure including outer steel grids and inner reinforced concrete core tubes (RCCT) as the background, the key problems involved in the performance-based structural design are analyzed and the table test is conducted. Anti-seismic and stability indicators are defined based on the structural characteristics; The research on seismic response is made through elastic-plastic time-history analysis and verified through the table test; The overall stability of the outer steel grids and the anti-collapse capability following the ineffectiveness of some key components are analyzed. Results show that the structure in which the outer steel grids are connected with internal steel frame and RCCT is practicable, and the said three systems can work together effectively; The time-history analysis shows that the structure is weak at the elevation of 5-15m but can still meet the expected anti-seismic target under rare earthquakes. The space steel structure features sound stability and high redundancy, which ensures the structure will not collapse even if several key components are damaged.

scholarly journals Seismic Performance Evaluation of a Reinforced Concrete Arch Bridge

2017 ◽  
Vol 12 (1) ◽  
pp. 120-126
Author(s):  
Jeena Dangol ◽  
Rajan Suwal
Keyword(s):  
Reinforced Concrete ◽  
Ground Motion ◽  
Seismic Performance ◽  
Axial Force ◽  
Time History ◽  
Time History Analysis ◽  
Longitudinal Displacement ◽  
Arch Bridge ◽  
History Analysis ◽  
Force Variation

The entire Himalayan belt including Nepal area, because of its active tectonic movement, is seismically active causing high risk of earthquake in this region. It is important to evaluate the seismic performance of the structures including bridges to identify to what extent they would survive during earthquake. A reinforced concrete two hinged arch bridge located in Chobhar, Nepal has been selected for the research purpose. This paper presents the determination of seismic performance of a reinforced concrete arch bridge under different ground motions. The seismic input was taken as five different earthquake ground motion histories having different V/H peak ground acceleration ratio for time history analysis. Displacement capacity of the bridge was determined from pushover analysis. Time history analysis was conducted in two different steps: first only horizontal acceleration was applied and next vertical acceleration was applied in addition to horizontal ground motion. Comparisons were made between the responses of the bridge for these two cases. It was found that inclusion of vertical component of ground motion has negligible effect in variation of longitudinal displacement. However, there was remarkable effect in axial force variation. Significant effect in axial force variation in arch rib was observed as V/H ratio increased although the effect in longitudinal displacement with increase in V/H ratio was negligible. Moment demand also increased due to high axial force variation because of vertical ground motion.Journal of the Institute of Engineering, 2016, 12(1): 120-126

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