scholarly journals Seismic Performance of Steel Frames with Semirigid Connections

2017 ◽  
Vol 2017 ◽  
pp. 1-10
Author(s):  
Iman Faridmehr ◽  
Mahmood Md. Tahir ◽  
Tom Lahmer ◽  
Mohd Hanim Osman
Keyword(s):  
Seismic Performance ◽  
Time History ◽  
Base Shear ◽  
Maximum Displacement ◽  
High Rise ◽  
History Analysis ◽  
Semirigid Connections ◽  
Extended End Plate ◽  
Plate Connection ◽  
Unloading Stiffness

The nonlinear stiffness matrix method was incorporated to investigate the structural performance of steel portal frames with semirigid connections. A portal frame with unstiffened extended end-plate connection was designed to demonstrate the adequacy of the proposed method. Besides, the seismic performance of steel portal frames with semirigid connections was investigated through time history analysis where kinematic hysteresis model was assigned to semirigid connections to account for energy dissipation and unloading stiffness. Based on the results of the study, it was found that generally semirigid connections influenced the force distribution which resulted in the decrease in base shear and lighter frame compared to the rigid one. The results also indicated that there was no direct relationship between maximum displacement at the top and connection stiffness in high-rise frames.

scholarly journals Seismic Performance of Multistorey RC Frame Building With The Soft Storey and Masonry Infill

2021 ◽  
pp. 650-656
Author(s):  
Kugan K ◽  
Mr. Nandha Kumar P ◽  
Premalath J
Keyword(s):  
Time History ◽  
Seismic Loading ◽  
Rc Frame ◽  
Base Shear ◽  
Maximum Displacement ◽  
Soft Storey ◽  
Masonry Infills ◽  
Frame Building ◽  
History Analysis ◽  
Rc Frame Building

In this study, four geometrically similar frames having different configurations of masonry infills, has been investigated. In this article attempts are made to explain the factors that impact the soft storey failure in a building are compared with different type of infill. That is Four models like RC bare frame, RC frame with brick mansonry infill, RC frame with brick infill in all the storeys exept the firstsoft storey, RC frame with inverted V bracing in the soft storey. Time history analysis has been carried out for a G+8 multistoried building to study the soft storey effect at different floor levels using E tabs software. The behavior of RC framed building with soft storey under seismic loading has been observed in terms of maximum displacement ,maximum storey drift, base shear and storey stiffness as considered structure.

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.

Research on Seismic Performance Objectives of High-Rise Diagrid Tube Structures

2010 ◽  
Vol 163-167 ◽  
pp. 1100-1106
Author(s):  
Jun Teng ◽  
Wei Liang Guo ◽  
Bai Sheng Rong ◽  
Zuo Hua Li ◽  
Zhi Jun Dong
Keyword(s):  
Seismic Performance ◽  
Design Method ◽  
Time History ◽  
Lateral Stiffness ◽  
Related Factors ◽  
Concrete Core ◽  
Core Tube ◽  
Plastic Energy ◽  
High Rise ◽  
History Analysis

Diagrid tube structures have advantages on constructing high-rise buildings for its great lateral stiffness, but its seismic design methodology researches are limited. The two-stage design method in Chinese code is not specific enough for the seismic fortification objectives of this kind of structures. It is necessary to propose some specific seismic performance objectives for the key components. Typical CFST diagrid tube-concrete core tube structures are studied by dynamic elastic-plastic time-history analysis using Perform-3D program. The structure plasticity developing process is summarized and the distribution characteristics of seismic fortification lines between tubes are discussed. The influences of main structure lateral stiffness related factors on the plasticity developing process are researched. The key components of structure lateral stiffness and plastic energy dissipation are studied. The seismic performance objectives of the key components are proposed for the three-level seismic fortification objectives.

scholarly journals Soil-pile-structure interaction effects on high-rise building under seismic shaking

2019 ◽  
Vol 2 (1) ◽  
pp. 153-164
Author(s):  
Umesh Jung Thapa ◽  
Ramesh Karki
Keyword(s):  
Soil Structure ◽  
Seismic Analysis ◽  
Time History ◽  
Soil Structure Interaction ◽  
Base Shear ◽  
Structure Interaction ◽  
High Rise ◽  
High Rise Building ◽  
History Analysis ◽  
Fixed Base

In this paper, study of the response (base shear, time period, storey drift, storey displacement) of a structure is done for the tall building including basement with fixed base and with pile foundation considering Soil Structure Interaction (SSI). Finite element based program ETABS2016 v16.1.0 is used for the analysis of the superstructure. Seismic analysis is done to get the dynamic response of superstructure for two types of model,one model is with fixed baseand second is Model with Winkler spring for Chhaya Center, Thamel, a high rise building with 14 story including double basements. Itisobserved with the consideration of Soil Structure Interaction (SSI). The soil is replaced by spring and assigned at joints. El Centro earthquake (1940) is used for time history analysis. The response obtained due to SSI effect is compared with fixed based model. Results of analysis presented include the comparison of natural periods, base shears, displacements and overturning moment. It is observed that the natural periods increase and the base shears decrease as the base become more flexible.

The Seismic Performance Analysis for the Ceramsite Concrete Frame – Shear Wall Structure

2014 ◽  
Vol 919-921 ◽  
pp. 981-988
Author(s):  
Jin Xuan Chen ◽  
Yan Wei Liu ◽  
Ju Rui Yang ◽  
Xiao Xia Hou
Keyword(s):  
Performance Analysis ◽  
Seismic Performance ◽  
Time History ◽  
Shear Wall ◽  
Wall Structure ◽  
Base Shear ◽  
Ordinary Concrete ◽  
Concrete Frame ◽  
History Analysis ◽  
Better Than

The paper focused on the seismic performance of ceramsite concrete frame—shear wall, which conducted the modal analysis and elasto-plastic time history analysis for 6 layers ceramsite concrete frame—shear wall and ordinary concrete frame—shear wall by software SAP2000. Then compared the results, which showed that the periods of ceramsite concrete frame—shear wall structure was longer than the ordinary concrete frame—shear wall structure, while the inter-storey drift ratio and the maximum absolute acceleration are less than ordinary concrete frame—shear wall. Besides, the largest base shear of ceramsite concrete frame—shear wall structure was less than ordinary concrete frame—shear wall structure. And the seismic performance of ceramsite concrete frame—shear wall showed was better than ordinary concrete frame—shear wall structure.

scholarly journals Seismic Performance Analysis of Self-Centering Concentrically Braced Steel Frame Structures

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Ergang Xiong ◽  
Kun Zu ◽  
Qian Zhang
Keyword(s):  
Seismic Performance ◽  
Time History ◽  
Repeated Loading ◽  
Base Shear ◽  
Cross Sectional ◽  
Braced Frame ◽  
Residual Drift ◽  
Concentrically Braced Frame ◽  
History Analysis ◽  
Concentrically Braced

To study the seismic performance of self-centering concentrically braced frame (SC-CBF) structure, the static elastoplastic analysis, low-cycle repeated loading analysis, and elastoplastic time-history analysis were conducted for a four-story SC-CBF structure, compared with the traditionally concentrically braced frame (CBF) structure. The influences of different GAP stiffnesses and cross-sectional areas of prestressed tendon were investigated on the self-centering and seismic performance of the SC-CBF structure. The results show that the SC-CBF structure has a strong lateral resistance, a small base shear under earthquake action, and a slight residual drift after unloading. The SC-CBF structure has a better ductility than the CBF structure. The displacement of the SC-CBF structure under the action of rare and extremely rare earthquakes is large, and the structure can dissipate more energy; the interstory drift is large, but the residual drift is small, exhibiting its ideal seismic and self-centering performance. However, the mechanical behavior of prestressed tendons is significantly affected by the stiffness of the GAP. The mechanical and seismic performances of the overall structure are slightly affected by the stiffness of the GAP, but the cross-sectional area of the prestressed tendons has a remarkable influence on the overall performance of the structure.

scholarly journals Dynamic Characteristics and Time-History Analysis of Hydraulic Climbing Formwork for Seismic Motions

2021 ◽  
Vol 2021 ◽  
pp. 1-17
Author(s):  
Gang Yao ◽  
Haoting Guo ◽  
Yang Yang ◽  
Chengming Xiang ◽  
Soltys Robert
Keyword(s):  
Finite Element ◽  
Time History ◽  
Element Model ◽  
Von Mises Stress ◽  
Guide Rail ◽  
Maximum Displacement ◽  
High Rise ◽  
History Analysis ◽  
Von Mises ◽  
The Finite Element Model

With the widespread use and increasing cycle life of climbing formwork to construct high-rise buildings in earthquake-prone areas, the risk of earthquakes during the construction period increases. Hence, it is necessary to analyze the seismic response of climbing formwork. According to actual climbing formwork in the super high-rise office building of Wanda Plaza in Kunming, China, the finite element model of the climbing formwork is established on the Ansys platform. The correctness of the model is verified by comparing the natural frequencies of the actual climbing formwork and the finite element model. The time-history analysis of the climbing formwork subjected to earthquakes of varying strong magnitudes is carried out. The maximum displacement position and maximum von Mises stress position of the climbing formwork under different working conditions are determined, and the seismic response of the climbing formwork is analyzed. It has been found that when the formwork is under construction, the maximum displacement position of the climbing formwork is at the center of the long beam of the upper platform, and the maximum von Mises stress position is the joint of the outer pole of the main platform and tripod. Under the climbing condition, the maximum displacement position of the climbing formwork is at the top of the outer pole of the upper platform, and the maximum von Mises stress position is the joint of the beam of the tripod and guide rail. The climbing formwork is partially damaged under the simulated earthquake. However, the displacement is large, and some components have reached the yield state. It is recommended to strengthen the connection between the upper platform and the guide rail and enhance the strength and rigidity of the outer pole and tripod. Climbing formwork is more sensitive to horizontal earthquakes and has minimal sensitivity to vertical earthquakes. The structure attached to the climbing formwork will reduce its sensitivity to earthquakes. The research results are of practical significance for seismic design and improvement of climbing formwork.

scholarly journals An Analytical Study of Flat Slab and Convention Slab with Framed Tube System by Performing Time History Analysis

2021 ◽  
Vol 9 (9) ◽  
pp. 2133-2140
Author(s):  
Mohammed Mohsin
Keyword(s):  
Time History ◽  
Time History Analysis ◽  
Seismic Zone ◽  
Base Shear ◽  
Reinforced Concrete Frame ◽  
Flat Slab ◽  
Concrete Frame ◽  
High Rise ◽  
High Rise Building ◽  
History Analysis

Abstract: To study seismic demand for regular reinforced concrete frame of flat slab with drop and conventional slab structure by using framed tube structural system by performing time history analysis. The performance of these slabs on 30 storey building will be studied for the analysis, seismic zone (v) will be considered. It is a type of linear dynamic analysis, in which the strength of the structure is tested within the elastic limit of the structure. In this project, high rise building of 30 of area 1296sq.m along with framed tube subjected to earthquake loading are analysed by time history analysis using ETABS software. The dynamic parameters such as base shear, story displacements, and story drift and time period of flat slab building with framed tube is being studied and compared to conventional slab. Keywords: High-rise building, Framed tube, Time history analysis

Influence of Connection Location on Dynamic Characteristics of Three-Towers-Connected High-Rise Building

2011 ◽  
Vol 243-249 ◽  
pp. 419-425 ◽  
Author(s):  
Wei Bin Yuan ◽  
Lie De Wang
Keyword(s):  
Dynamic Characteristics ◽  
Flexible Structures ◽  
Time History ◽  
Mode Shapes ◽  
Maximum Displacement ◽  
Maximum Acceleration ◽  
Natural Period ◽  
High Rise ◽  
History Analysis ◽  
The Difference

With the increase of the height, the lateral stiffness of high-rise buildings decreased. The high and flexible structures would have large movement when they are suffered lateral forces arising from earthquakes and winds. Compared with the ordinary high-rise buildings, the dynamic characteristics of the connected tall building will be changed by the connection; its seismic response and background of excitation are more complicated. Various finite element models with different connection location are established in order to find out the change of dynamic characteristics caused by the connection. According to modal analysis, the natural periods and mode shapes of different models are obtained. By utilizing the time history analysis method, El Centro earthquake wave was inputted, the seismic responses are obtained. The difference of results and summarized variation of dynamic characteristics with connection factors are analyzed. The results show that structural natural period and mode shape will be changed when the connection position changing. Under the seismic excitation, the change of location has little effect on the displacement time history and the maximum displacement, but the influences to the acceleration time history and the maximum acceleration value are obvious.

scholarly journals Seismic Performance of Damper Installed In High-Rise Steel Building In Bangladesh

2018 ◽  
Vol 9 (1) ◽  
pp. 1-12
Author(s):  
T. Tabassum ◽  
K.S. Ahmed
Keyword(s):  
Linear Time ◽  
Time History ◽  
Time History Analysis ◽  
Friction Damper ◽  
Maximum Displacement ◽  
Maximum Acceleration ◽  
High Rise ◽  
History Analysis ◽  
Steel Building ◽  
Joint Acceleration

This research paper describes the results of analysis of the seismic behavior of a thirty story steel building with and without damper under different earthquake acceleration signals. The proposed procedure placed the various types of damper like friction damper, bilinear damper and exponential damper on the top three floors of the building. The study compares the different performances such as the joint displacement, joint acceleration, the base force of structure with and without damper for a thirty-story steel building using ETAB2015. The study further performs time history analysis for different seismic accelerograms to observe the actual time domain responses of the structure. Linear time-history analysis on this steel building structure indicates that maximum displacement, maximum base force, and maximum acceleration effectively reduce in the presence of damper at top three floors of the building.

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