scholarly journals Nonlinear Seismic Response of Multistory Steel Frames with Self-Centering Tension-Only Braces

2020 ◽  
Vol 10 (5) ◽  
pp. 1819
Author(s):  
Pei Chi ◽  
Jun Dong ◽  
Wenlong Tian ◽  
Dafu Cao
Keyword(s):  
Energy Dissipation ◽  
Seismic Response ◽  
Pushover Analysis ◽  
Steel Frames ◽  
Nonlinear Dynamic Analysis ◽  
Internal Force ◽  
Earthquake Intensity ◽  
Nonlinear Seismic Response ◽  
Load Distributions ◽  
Bracing System

The self-centering tension-only brace (SC-TOB) is a new and innovative bracing system that provides both a flag-shaped recentering hysteresis and load mitigation to structures. This paper presents an extensive investigation of the nonlinear seismic response of multistory steel frames built with SC-TOBs to internal force, drift, and energy dissipation. Pushover analysis subjected to two lateral load distributions and nonlinear dynamic analysis under ground motion ensembles corresponding to four hazard levels were conducted. The SC-TOBs can be designed to serve as conventional tension-only braces (TOBs) only providing lateral stiffness during minor earthquakes, to function with energy dissipation as intensity increases, and to fully recenter a structure even after severe earthquakes. The findings show that with an increase in the earthquake intensity, both the force response and drift response of the SC-TOB frames (SC-TOBFs) increased; however, the force distribution and drift distribution shapes of the SC-TOBFs remained almost constant. The SC-TOBFs generally experienced more energy dissipation in the lower parts of the building, while the upper stories dissipated almost no energy under certain load conditions, suggesting that the bracings on those stories could be replaced by conventional TOBs for economy. It is demonstrated that the SC-TOBs have immense potential to effectively improve seismic resilience to structures such that rehabilitation costs and operational disruptions after earthquakes are minimized.

scholarly journals Evaluation of p-delta effect in structural seismic response

2018 ◽  
Vol 162 ◽  
pp. 04019 ◽  
Author(s):  
Sardasht Sardar ◽  
Ako Hama
Keyword(s):  
Seismic Response ◽  
Pushover Analysis ◽  
Nonlinear Dynamic Analysis ◽  
Time History ◽  
Steel Structure ◽  
Nonlinear Static Analysis ◽  
Structural Behavior ◽  
Finite Element Software ◽  
History Analysis ◽  
Nonlinear Static

Numerous recent studies have assessed the effect of P-Delta on the structures. This paper investigates the effect of P-Delta in seismic response of structures with different heights. For indicating the effect of P-Delta, nonlinear static analysis (pushover analysis) and nonlinear dynamic analysis (Time history analysis) were conducted by using finite element software. The results showing that the P-Delta has a significant impact on the structural behavior mainly on the peak amplitude of building when the height of the structures increased. In addition, comparison has been made between concrete and steel structure.

scholarly journals Seismic Response Analysis of Multi-Story Steel Frames Using BRB and SCB Hybrid Bracing System

2019 ◽  
Vol 10 (1) ◽  
pp. 284 ◽  
Author(s):  
Rong Chen ◽  
Canxing Qiu ◽  
Dongxue Hao
Keyword(s):  
Seismic Response ◽  
Seismic Analysis ◽  
Steel Frames ◽  
Residual Deformation ◽  
High Energy ◽  
Response Analysis ◽  
Building Structures ◽  
Seismic Capacity ◽  
Story Drift ◽  
Bracing System

Multi-story steel frames are popular building structures. For those with insufficient seismic resistance, their seismic capacity can be improved by installing buckling-restrained braces (BRBs), which is known for high energy dissipation capacity, and the corresponding frame is denoted as BRB frame (BRBF). However, BRBFs are frequently criticized because of excessive residual deformations after earthquakes, which impede the post-event repairing work and immediate occupancy. Meanwhile, self-centering braces (SCBs), which were invented with a particular purpose of eliminating residual deformation for the protected structures, underwent fast development in recent years. However, the damping capability of SCBs is relatively small because their hysteresis is characterized by a flag shape. Therefore, this paper aims to combine these two different braces to form a hybrid bracing system. A total of four combinations are proposed to seek an optimal solution. The multi-story steel frames installed with BRBs, SCBs, and combined braces are numerically investigated through nonlinear static and dynamic analyses. Interested seismic response parameters refer to the maximum story drift ratios, maximum floor accelerations, and residual story drift ratios. The seismic analysis results indicate that the frames using the combined bracing system are able to take the advantages of BRBs and SCBs.

Analysis of Impacts of Staircase upon Seismic Responses of Structure

2011 ◽  
Vol 94-96 ◽  
pp. 469-475 ◽  
Author(s):  
Jie Jiang Zhu ◽  
Cai Xia Wang ◽  
Yang Lee
Keyword(s):  
Finite Element ◽  
Seismic Response ◽  
Pushover Analysis ◽  
Internal Force ◽  
Nonlinear Finite Element ◽  
Seismic Responses ◽  
Earthquake Disaster ◽  
The Real ◽  
Different Types ◽  
Real Earthquake

Staircase units have both active and hazard impacts on whole structure under earthquake. The existence of these impacts should not be neglected during designing process. Three sets of nonlinear finite element (FE) models of different types are finely built with and without staircase units, upon which dynamic earthquake analysis and pushover analysis are carried out to simulate the real earthquake disaster. Comparisons of overall properties, pushover performances, seismic response and internal force of elements are summarized and discussed between two models of a set. Potential dangerous elements are found while the reasons are generalized. Suggestions upon designing process are given as well.

Seismic Response Analysis for Shallow Tunnel in Different Earthquake Intensity

2013 ◽  
Vol 680 ◽  
pp. 161-165 ◽  
Author(s):  
Li Lin ◽  
He Chuan ◽  
Zhang Jing ◽  
Geng Ping
Keyword(s):  
Numerical Simulation ◽  
Seismic Response ◽  
Model Test ◽  
Internal Force ◽  
Shaking Table ◽  
Response Analysis ◽  
Shallow Tunnel ◽  
Earthquake Intensity ◽  
Study Results ◽  
Table Model

Base on the large-shaking table model test，studies on the seismic response characters of shallow tunnel in different earthquake intensity are made by mainly using numerical simulation. The results indicate that there is a good agreement between the model test and numerical simulation. the different earthquake intensity has great effects on the seismic response characters, The distribution of the lining cross-section’s internal force is oval-shaped and the value which in conjugate 45° direction is greater than crown and bottom of arch. Moreover, the internal forces vary from earthquake intensity in the same direction. It is great to recognize the seismic response characters of shallow tunnels through the study results and it provides reference for the similar projects.

Nonlinear Seismic Response of Special-Shaped Column Frame Structures

2010 ◽  
Vol 163-167 ◽  
pp. 1222-1225
Author(s):  
Xiao Bin Han ◽  
Chun Sheng Bao ◽  
Ying Gao ◽  
Jian Min Bian
Keyword(s):  
Spatial Analysis ◽  
Seismic Response ◽  
Seismic Performance ◽  
Nonlinear Dynamic ◽  
Ground Motions ◽  
Nonlinear Dynamic Analysis ◽  
Frame Structure ◽  
Frame Structures ◽  
Analysis Model ◽  
Nonlinear Seismic Response

The spatial analysis model of special-shaped column frame structure is established in ANSYS. The nonlinear dynamic analysis is carried out for the structure by inputting ground motions in one direction. The seismic performance of the structure under rare seismic actions was examined and whether the structure achieved the predetermined seismic aims is evaluated. The results indicates that the structure which under the 8-degree zone designed according to the codes can achieve the predetermined seismic aims under the rarely occurred earthquake actions.

Comparison of steel frames with RWS and WFP beam-to-column connections through seismic fragility analysis

2020 ◽  
pp. 136943322097728
Author(s):  
Haoran Yu ◽  
Weibin Li
Keyword(s):  
Limit State ◽  
Pushover Analysis ◽  
Steel Frames ◽  
Fragility Analysis ◽  
Structural Safety ◽  
Seismic Fragility ◽  
Fe Modelling ◽  
Collapse Resistance ◽  
Seismic Collapse ◽  
Probabilistic Seismic Demand

Reduced web section (RWS) connections and welded flange plate (WFP) connections can both effectively improve the seismic performance of a structure by moving plastic hinges to a predetermined location away from the column face. In this paper, two kinds of steel frames—with RWS connections and WFP connections—as well as different frames with welded unreinforced flange connections were studied through seismic fragility analysis. The numerical simulation was conducted by using multiscale FE modelling. Based on the incremental dynamic analysis and pushover analysis methods, probabilistic seismic demand analysis and seismic capability analysis were carried out, respectively. Finally, combined with the above analysis results, probabilistic seismic fragility analysis was conducted on the frame models. The results showed that the RWS connection and WFP connection (without double plates) have little influence on reducing the maximum inter-storey drift ratio under earthquake action. RWS connections slightly reduce the seismic capability in non-collapse stages and improve the seismic collapse resistance of a structure, which exhibits good structural ductility. WFP connections can comprehensively improve the seismic capability of a structure, but the seismic collapse resistance is worse than that of RWS connections when the structure has a large number of storeys. The frame with WFP connections has a lower failure probability at every seismic limit state, while the frame with RWS connections sacrifices some of its structural safety in non-collapse stages to reduce the collapse probability.

Experimental Research and Finite Element Analysis on Behavior of Steel Frame with Semi-Rigid Connections

2010 ◽  
Vol 168-170 ◽  
pp. 553-558
Author(s):  
Feng Xia Li ◽  
Bu Xin
Keyword(s):  
Architectural Design ◽  
Plastic Hinge ◽  
Steel Frames ◽  
Seismic Energy ◽  
Internal Force ◽  
Steel Frame ◽  
Frame Structure ◽  
Element Analysis ◽  
Rigid Deformation ◽  
Steel Frame Structure

Most steel beam-column connections actually show semi-rigid deformation behavior that can contribute substantially to overall displacements of the structure and to the distribution of member forces. Steel frame structure with semi-rigid connections are becoming more and more popular due to their many advantages such as the better satisfaction with the flexible architectural design, low inclusive cost and environmental protect as well. So it is very necessary that studying the behavior of those steel frame under cyclic reversal loading. On the basics of connections experiments the experiment research on the lateral resistance system of steel frame structure has been completed. Two one-second scale, one-bay, two-story steel frames with semi-rigid connections under cyclic reversal loading. The seismic behavior of the steel frames with semi-rigid connections, including the failure pattern, occurrence order of plastic hinge, hysteretic property and energy dissipation, etc, was investigated in this paper. Some conclusions were obtained that by employing top-mounted and two web angles connections, the higher distortion occurred in the frames, and the internal force distributing of beams and columns was changed, and the ductility and the absorbs seismic energy capability of steel frames can be improved effectively.

Nonlinear Dynamic Analysis of the Damping Frame Structure System

2012 ◽  
Vol 594-597 ◽  
pp. 886-890 ◽  
Author(s):  
Gan Hong ◽  
Mei Li ◽  
Yi Zhen Yang
Keyword(s):  
Energy Dissipation ◽  
Seismic Response ◽  
Nonlinear Dynamic ◽  
Time History ◽  
Time History Analysis ◽  
Frame Structure ◽  
Force Model ◽  
Operating Characteristics ◽  
Restoring Force ◽  
History Analysis

Abstract. In the paper, take full account of energy dissipation operating characteristics. Interlayer shear-frame structure for the analysis of the Wilson-Θmethod ELASTOPLASTIC schedule, the design of a nonlinear dynamic time history analysis procedure. On this basis, taking into account the restoring force characteristics of the energy dissipation system, the inflection point in the restoring force model treatment, to avoid a result of the calculation results of distortion due to the iterative error. A frame structure seismic response time history analysis results show that: the framework of the energy dissipation significantly lower than the seismic response of the common framework, and its role in the earthquake when more significant.

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