Research on RC Frames Collapse-Resistant Capacity of Different Seismic Fortification Levels

2013 ◽  
Vol 443 ◽  
pp. 184-188
Author(s):  
Guang Shu Xu
Keyword(s):  
Axial Ratio ◽  
Frame Structure ◽  
Mode Shapes ◽  
Collapse Mechanism ◽  
Rc Frame ◽  
Rc Frames ◽  
Rc Frame Structure ◽  
Rc Structure ◽  
Analysis Of Results ◽  
Structure Collapse

The use of professional structure analysis software ANSYS analyzes the strength and seismic performance for multilayer RC structure, and through the analysis of numerical simulation, the vibration frequencies of RC frame structure and mode shapes and other seismic parameters are got, combined with IDA structure collapse fragility analysis method, the safety performance of the resistance collapse of first-order structures and two modes are been quantitative evaluation, to get the axial ratio of RC frame structure and the collapse mechanism. Finally, according to the analysis of results, the structure seismic is put forward the proposals, to provide a theoretical reference for the study of structural seismic fortification.

scholarly journals Dynamic analysis of multilayer-reinforced concrete frame structures based on NewMark-β method

2021 ◽  
Vol 60 (1) ◽  
pp. 567-577
Author(s):  
Yizhe Liu ◽  
Bofang Zhang ◽  
Ting Wang ◽  
Tian Su ◽  
Hanyang Chen
Keyword(s):  
Reinforced Concrete ◽  
Seismic Analysis ◽  
Frame Structure ◽  
Frame Structures ◽  
Stiffness Coefficient ◽  
Rc Frame ◽  
Rc Frame Structure ◽  
Rc Structure ◽  
Reduction Coefficient ◽  
The Impact

Abstract The analysis method of the simplified structure formation model provides the basis for the analysis of the reinforced concrete (RC) structure under earthquake and dynamic load, which has important significance for seismic analysis of RC structure. In this paper, the three-layer RC frame structure is simulated and analyzed by MATLAB based on the NewMark-β method, considering the influence of time-varying simple harmonic loads and seismic waves on acceleration, displacement, and velocity of RC structure. The vibration response of the RC structure is analyzed by introducing the stiffness reduction coefficient. The results show that NewMark-β method provides a new idea for the seismic response of RC frame structures, making the seismic analysis of frame structures more practical; the variation range of its elastic modulus is obtained through the analysis of the constitutive model of RC, which provides the basis for the value of the stiffness coefficient; the application of the top load and the bottom load has different structural responses to the RC frame structure, and the impact of the load on the structure is more adverse when the load acts on the bottom; with the change of time, the binding stiffness coefficient will also change, and the stability of the structure will decrease greatly; the function relationship between the acceleration of the third floor and the reduction coefficient of rigidity is obtained by taking different values of the reduction coefficient of rigidity.

Experimental Study on the Damaged RC Frame Structure Strengthened by Composite Reinforcement of CFRP and Steel Plate under Low-Cycle Repeated Load

2011 ◽  
Vol 94-96 ◽  
pp. 1437-1441
Author(s):  
Shao Wei Zhao ◽  
Kun Yuan ◽  
Rong Guo
Keyword(s):  
Test Performance ◽  
Steel Plate ◽  
Low Frequency ◽  
The Other ◽  
Frame Structure ◽  
Rc Frame ◽  
Rc Frames ◽  
Rc Frame Structure ◽  
Repeated Load ◽  
Dimension One

We take low frequency cyclic reverse tests to three RC frames made with the same dimension. One of frames is not reinforced for reference; the others are loaded to steel yield and then completely uninstalled. One of injury RC frames is strengthened by CFRP, and we use CFRP and steel plate mixed to strengthen the other one. Then experiment under low-cycle repeated load for strengthened frames have done again, and two seismic reinforcement methods are compared by the test performance of the framework. The results show that compared to CFRP, mixed reinforcement can improve the structural bearing capacity more effectively. The frame strengthened by CFRP reflects better energy dissipation and ductility than another.

scholarly journals Numerical Models to Predict the Collapse Behavior of RC Columns and Frames

2017 ◽  
Vol 11 (1) ◽  
pp. 854-860 ◽  
Author(s):  
Xuchuan Lin ◽  
Xinzheng Lu
Keyword(s):  
Numerical Models ◽  
Frame Structure ◽  
Collapse Mechanism ◽  
Rc Frame ◽  
Backbone Curve ◽  
Rc Columns ◽  
Rc Column ◽  
Rc Frames ◽  
Adopted Model ◽  
Collapse Behavior

Introduction: Blind analysis contests for predicting the results of several collapse tests on RC frame structure, were carried out by the Collapse Prevention Committee of Architectural Society of China in 2011. This paper presents the adopted numerical models for the collapse simulations of four RC column tests and one RC frame test. Methods: The columns and beams in the RC frame were modeled by beam elements using the fiber model of THUFIBER program. The confined effect of the stirrups in the square RC column was taken into account by using the backbone curve of confined concrete. The methods to determine the key parameters of the adopted model were introduced. Results and Conclusion: The prediction results were compared with the test results, and the adopted models exhibited good predictions for the general behavior of both the RC columns and frame. The model was proposed for investigating the collapse mechanism of RC frames.

Analysis on the Effect of Filler Wall to the Dynamic Characteristics and Storey Displacement of RC Frame Structure

2011 ◽  
Vol 255-260 ◽  
pp. 644-648
Author(s):  
Yan Xia Ye ◽  
Hua Huang ◽  
Dong Wei Li
Keyword(s):  
Dynamic Characteristics ◽  
Seismic Waves ◽  
Great Influence ◽  
Reduction Factor ◽  
Frame Structure ◽  
Vibration Modes ◽  
Rc Frame ◽  
Soft Storey ◽  
Rc Frame Structure ◽  
Rc Frame Structures

Comparative analyses of twenty-eight finite element structures with filler walls were established to study dynamic characteristics of RC frame structures under seismic waves. The results of these analyses show that filler walls have little influence on vibration modes of the structure. But as a result of soft storey in the bottom of building caused by reduction of the filler walls, vibration modes have a great influence. As the stiffness of filler wall decrease, the stiffness of soft storey decrease shapely, vibration mode curve becomes much smoother. Considering the filler wall has influence on the vibration periods of framework, the reduction factor of 0.7 should be taken. The influence of filler wall to the value of lateral drift and storey displacement angle of frame can not be ignored. The main effect factors to the dynamic characteristics of framework are included quantity, location, material of the fill wall and the selection of seismic waves.

Research on the Collapse Performance of RC Frame Structure

2014 ◽  
Vol 556-562 ◽  
pp. 712-715
Author(s):  
Jing Zhao ◽  
Jing Zhao ◽  
Xing Wang Liu
Keyword(s):  
Reinforced Concrete ◽  
Frame Structure ◽  
Rc Frame ◽  
Hydraulic Actuator ◽  
Reinforced Concrete Frame ◽  
Concrete Frame ◽  
Load Paths ◽  
Rc Frame Structure ◽  
Gravity Load ◽  
Middle Column

In collapse-resistant design of a structure under accidental local action, it is important to understand the failure mechanism and alternative load paths. In this paper, a pseudo-static experimental method is proposed. Based on which, the collapse of frame structure was simulated with testing a 1/3 scale; 4-bay and 3-story plane reinforced concrete frame. In the experience, the middle column of the bottom floor was replaced by mechanical jacks to simulate its failure, and the simulated superstructure’s gravity load acted on the column of the top floor by adopting a servo-hydraulic actuator with force –controlled mode.

Seismic Damage Analysis and the Study of Reinforcement Measures for RC Frame Structure Building in Civil Engineering

2012 ◽  
Vol 568 ◽  
pp. 85-88
Author(s):  
Ming Gao
Keyword(s):  
Structural Damage ◽  
Civil Engineering ◽  
Seismic Damage ◽  
Frame Structure ◽  
Bottom Plate ◽  
Rc Frame ◽  
Structure Building ◽  
Damage Degree ◽  
Rc Frame Structure ◽  
Reinforcement Measures

In 5·12 Wenchuan earthquake, most of the buildings were damaged at different degrees in Mianyang. To analysis seismic damage of RC frame structure building, and investigate its reinforcement situation，the results show that: For destruction of frame column or bottom frame structure column, enlarge section method is used mostly for reinforcement in civil engineering；To serious damage of affiliated structure such as filler wall and Parapet, most of them will be demolished and built again, and add constructional column; To the situation of concrete bottom plate with crack, paste carbon fiber sheet or bottom plant steel was used depending on the structural damage degree, and jet concrete for strengthening.

The behaviour Analysis of RC Frame Structure under Explosion Loading

2010 ◽  
Vol 97 (28) ◽  
pp. 25-32
Author(s):  
Marin Lupoae ◽  
Carmen Bucur ◽  
Cătălin Baciu
Keyword(s):  
Frame Structure ◽  
Rc Frame ◽  
Behaviour Analysis ◽  
Rc Frame Structure ◽  
Explosion Loading

scholarly journals Research on Improved Equivalent Diagonal Strut Model for Masonry-Infilled RC Frame with Flexible Connection

2019 ◽  
Vol 2019 ◽  
pp. 1-18
Author(s):  
Guang Yang ◽  
Erfeng Zhao ◽  
Xiaoya Li ◽  
Emad Norouzzadeh Tochaei ◽  
Kan Kan ◽  
...  
Keyword(s):  
Simulation Method ◽  
Structure Type ◽  
Frame Structure ◽  
Rc Frame ◽  
Infill Wall ◽  
Artificial Fish Swarm Algorithm ◽  
Rc Frame Structure ◽  
Proposed Model ◽  
Seismic Design Code ◽  
Artificial Fish Swarm

The reinforced concrete (RC) frame with masonry infill wall is one of the most common structural systems in many countries. It has been widely recognized that the infill wall has significant effects on the seismic performance of RC frame structure. During the Wenchuan earthquake (China 2008), a lot of infilled RC frame structures suffered serious damages due to the detrimental effects brought about by the infill wall rigidly connected to the surrounding frame. In order to solve this problem, flexible connection, introduced by Chinese designers, is recommended by the updated Chinese seismic design code, because of its effect to reduce the unfavorable interaction between infill wall and frame. Although infilled RC frame structure with flexible connection has a lot of advantages, but because of the lack of research, this structure type is seldom used in practical engineering. Therefore, it is of great significance to scientifically investigate and analyze the effects of flexible connection on structure behaviors of infilled RC frame. In this study, a macrofinite element numerical simulation method for infilled RC frame with flexible connection was investigated. Firstly, the effects of connection between infill wall and surrounding frame on in-plane behaviors of infilled RC frame were discussed. Secondly, based on deeply studying the equivalent diagonal strut models for infilled RC frame with rigid connection, an improved equivalent diagonal strut model for infilled RC frame with flexible connection was proposed. Employed with inversion analysis theory, the parameter in the proposed model was estimated through artificial fish swarm algorithm. Finally, applied with the existing experiment results, a case study was conducted to verify the effectiveness and feasibility of the proposed model.

Analysis of Seismic Appraisal Evaluation of Existing RC Frame Structure Used for Primary and Secondary Schools in Kunming

2011 ◽  
Vol 255-260 ◽  
pp. 2632-2636
Author(s):  
Zhong Wei Liu ◽  
Yu Bai ◽  
Xiang Hui Xiong ◽  
Jun Ting Li
Keyword(s):  
Statistical Analysis ◽  
Secondary School ◽  
Secondary Schools ◽  
Frame Structure ◽  
Earthquake Resistance ◽  
Rc Frame ◽  
Rc Frame Structure ◽  
Primary And Secondary School

Based on the appraisal reports of primary and secondary school in Kunming and the statistical analysis of RC frame structure buildings, evaluation of earthquake resistance capacity was given. Problems affecting functions of the RC frame structure were analyzed to facilitate the reconstruction and fetrofit of this sort of RC frame structure.

Sign in / Sign up

Export Citation Format

Share Document