Inter-Story Capacity Spectrum for the Performance Based Seismic Design of Vertically Irregular RC Frame Structures II: Examples

2012 ◽  
Vol 517 ◽  
pp. 749-754
Author(s):  
Jin Jie Men ◽  
Qing Xuan Shi ◽  
Qi Zhou
Keyword(s):  
Time History ◽  
Earthquake Hazard ◽  
Frame Structure ◽  
Rc Frame ◽  
Direct Displacement Based Design ◽  
Capacity Spectrum ◽  
Story Drift ◽  
Performance Based Seismic Design ◽  
Hazard Level ◽  
Rc Frame Structures

The procedure to establish the inter-story capacity spectrum method is explained detailedly in partⅠ. In this part examples are presented to demonstrate the applicability and utility of the proposed method. It is shown that the vertically irregular RC frame structure can be directly designed with the methodology proposed in this work. It is also concluded that the new method can control the inter-story drift, the order and position of hinges of vertically irregular structures under different earthquake hazard level. Comparing to time history analysis method, it leans to cautious and is superior to direct displacement-based design (DDBD).

Nonlinear Analysis of a RC Frame Structure with Semi-Interlayers Damaged during Wenchuan Earthquake

2010 ◽  
Vol 156-157 ◽  
pp. 467-472
Author(s):  
Peng Tao Yu ◽  
Jing Jiang Sun
Keyword(s):  
Nonlinear Analysis ◽  
Wenchuan Earthquake ◽  
Time History ◽  
Large Earthquake ◽  
Frame Structure ◽  
Nonlinear Time History Analysis ◽  
Frame Structures ◽  
Rc Frame ◽  
Rc Frame Structures ◽  
Nonlinear Time History

Under the excitation of large earthquake, structures enter into high nonlinear stage. Currently, Opensees, Perform-3d and Canny are used as the most popular nonlinear analysis procedures. The fiber model will be introduced firstly and the nonlinear analysis models in Canny are explained in detail. Then Canny2007 is used to conduct nonlinear time history analysis on a heavily damaged frame structure with interlayer in Dujiangyan during Wenchuan Earthquake. Analysis shows that the maximum inter-story drift appears between the interlayer and its upper layer, and the heavy damage agrees well with the results of damage investigation. By comparing the damage extent of frame structures with or without interlayer, it reveals that the seismic performance of RC frame structures without interlayer is obviously better than that of ones with interlayer.

Analysis for Collapse Process of Multi-Layer RC Frame Structures under Earthquakes

2014 ◽  
Vol 1065-1069 ◽  
pp. 1402-1407 ◽  
Author(s):  
Jia Ming Gao ◽  
Chang Quan Zhou ◽  
Bo Long Liu ◽  
Bo Quan Liu
Keyword(s):  
Time History ◽  
Frame Structure ◽  
Great Earthquake ◽  
Rc Frame ◽  
Structural Collapse ◽  
Constant Stiffness ◽  
Finite Element Software ◽  
Rc Frame Structure ◽  
Object Of Study ◽  
Rc Frame Structures

Multi-storey RC-frame structure occupies a large proportion of the building structure in our country, the collapse of multi-storey frame structure in great earthquake is very serious, and it has become a major threat to people's life and property security, so research of the rule about structural collapse and define the critical state of structural collapse accurately is necessary. This paper focuses on the rule of structural collapse, takes constant stiffness multi-layer RC-frame structure as the object of study, with height, span and number of floors as the variables, uses nonlinear finite element software ANSYS/LS-DYNA, bases on elastic-plastic time history analysis, studies the rule of plastic deformation’s development of constant stiffness multi-layer RC-frame structure, and the relationship between story-drift and structural collapse.

scholarly journals Optimal FRP Jacket Placement in RC Frame Structures Towards a Resilient Seismic Design

2019 ◽  
Vol 11 (24) ◽  
pp. 6985 ◽  
Author(s):  
G. Mahdavi ◽  
K. Nasrollahzadeh ◽  
M. A. Hariri-Ardebili
Keyword(s):  
Heuristic Algorithms ◽  
Plastic Hinge ◽  
Optimization Procedure ◽  
Frame Structure ◽  
Frame Structures ◽  
Rc Frame ◽  
Rotation Capacity ◽  
Rc Frame Structure ◽  
Story Drift ◽  
Rc Frame Structures

This paper proposes an optimal plan for seismically retrofitting reinforced concrete (RC) frame structures. In this method, the columns are wrapped by fiber-reinforced polymer (FRP) layers along their plastic hinges. This technique enhances their ductility and increases the resiliency of the structure. Two meta-heuristic algorithms (i.e., genetic algorithm and particle swarm optimization) are adopted for this purpose. The number of FRP layers is assumed to be the design variable. The objective of the optimization procedure was to provide a uniform usage of plastic hinge rotation capacity for all the columns, while minimizing the consumption of the FRP materials. Toward this aim, a single objective function containing penalty terms is introduced. The seismic performance of the case study RC frame was assessed by means of nonlinear pushover analyses, and the capacity of the plastic hinge rotation for FRP-confined columns was evaluated at the life safety performance level. The proposed framework was then applied to a non-ductile low-rise RC frame structure. The optimal retrofit scheme for the frame was determined, and the capacity curve, inter-story drift ratios, and fragility functions were computed and compared with alternative retrofit schemes. The proposed algorithm offers a unique technique for the design of more resilient structures.

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.

scholarly journals Performance Based Seismic Assessment of Masonry Infilled RCC Building with Diaphragm Discontinuity

2020 ◽  
Vol 10 (2) ◽  
pp. 214-220
Keyword(s):  
Seismic Vulnerability ◽  
Pushover Analysis ◽  
Performance Criteria ◽  
Equivalent Linearization ◽  
Inelastic Displacement ◽  
Capacity Spectrum ◽  
Open Ground ◽  
Story Drift ◽  
Performance Based Seismic Design ◽  
Structural Irregularities

In multistoreyed RCC framed buildings, critical damages are due to seismic ground excitations, which cause catastrophic failuresat the weaker locations. Buildings with two types of structural irregularities namely diaphragm discontinuity and open ground story are considered. Assessment of seismic vulnerability of these buildings is done by using Nonlinear Static Pushover Analysis (NSPA). Performance Based Seismic Design of masonry infilled RCC buildings with two different shape of openings in the diaphragm is considered here with Design Basis Earthquake(DBE) and Maximum Considered Earthquake(MCE) where by selecting appropriate performance criteria in terms of Inter-story drift ratio(IDR) and Inelastic displacement demand ratio(IDDR) are critically observed. The Equivalent Linearization Procedure of Pushover analysis presented in FEMA 440, which is a modification of Capacity Spectrum Method based on ATC-40 guidelines, is performed in ETABS-2016 to study the performance of R.C.C. buildings with diaphragm discontinuity, designed as per IS-1893-2016.

Elastoplastic time history analysis of reinforced engineered cementitious composite or engineered cementitious composite–concrete composite frame under earthquake action

2016 ◽  
Vol 20 (4) ◽  
pp. 491-503 ◽  
Author(s):  
Fang Yuan ◽  
Jinlong Pan ◽  
Christopher KY Leung
Keyword(s):  
Cyclic Loading ◽  
High Performance ◽  
Time History ◽  
Frame Structure ◽  
Dissipated Energy ◽  
Seismic Resistance ◽  
Cementitious Composite ◽  
Engineered Cementitious Composite ◽  
Composite Frame ◽  
Story Drift

Engineered cementitious composite is a class of high-performance cementitious composites with pseudo-strain hardening behavior and excellent crack control capacity. Substitution of concrete with engineered cementitious composite can greatly reduce the cracking and durability problems associated with low tensile strength and brittleness of concrete and can significantly increase structural seismic resistance. In this article, a pair of beam–column joints with various matrix types has been tested under reversed cyclic loading to study the effect of substitution of concrete with engineered cementitious composite in the joint zone on the seismic behaviors of composite members. After that, a simplified constitutive model of engineered cementitious composite under cyclic loading is proposed, and the structural performance of steel reinforced engineered cementitious composite members is simulated by fiber beam elements. The accuracy of the model is verified with test data. Finally, three frame structures with different matrixes subjected to earthquake actions were numerically modeled to verify the contribution of ductile engineered cementitious composite material to structural seismic resistance. The seismic responses or failure mechanisms, deformation patterns, and energy dissipation capacities for each frame structure are analyzed and compared. The simulation results indicate that the application of engineered cementitious composite can reduce the maximum story drift ratio, and the distributions of the dissipated energy are more uniform along the building height when engineered cementitious composite is strategically used in ground columns and beam–column joints of the frame structure. The seismic performance of the reinforced engineered cementitious composite-concrete composite frame is found to be even better than the frame with all concrete replaced by engineered cementitious composite.

Analysis of the Seismic Performance of RC Frame Structures with Different Types of Bracings

2012 ◽  
Vol 166-169 ◽  
pp. 2209-2215
Author(s):  
Zhi Xin Wang ◽  
Hai Tao Fan ◽  
Huang Juan Zhao
Keyword(s):  
Seismic Performance ◽  
Time History ◽  
Steel Tube ◽  
Frame Structure ◽  
Frame Structures ◽  
Finite Element Models ◽  
Base Shear ◽  
Concrete Filled Steel Tube ◽  
Different Types ◽  
Rc Frame Structures

Finite element models of frames with steel-bracings and with concrete filled steel tube struts are built in ETABS. Seismic performance of these models is analyzed with base-shear method, superposition of modal responses method and time history method respectively. The results show that the steel-bracings or concrete filled steel tube struts are efficient to increase the story-stiffness, and the top displacement of the frame structure decreases significantly.

The influence of construction joint on the seismic behavior of reinforced concrete frame structure

2016 ◽  
Vol 20 (7) ◽  
pp. 1125-1138 ◽  
Author(s):  
Jing Yu ◽  
Xiaojun Liu ◽  
Xingwen Liang
Keyword(s):  
Reinforced Concrete ◽  
Seismic Behavior ◽  
Numerical Models ◽  
Time History ◽  
Frame Structure ◽  
Nonlinear Time History Analysis ◽  
Reinforced Concrete Frame ◽  
Concrete Frame ◽  
Construction Joint ◽  
Story Drift

A new model that can simulate the behavior of construction joint subjected to seismic forces was proposed. Nonlinear time-history analysis was carried out for reinforced concrete regular frame structures designed in different seismic intensity regions as well as with different height-to-width ratios. Two kinds of numerical models are adopted to simulate the seismic behavior of each frame, one with construction joint using the new proposed model and the other without construction joint using the conventional model. Results show that the influence of construction joint on the seismic behavior of reinforced concrete frame is strongly related to structural nonlinearity. It may increase the top displacement and the inter-story drift, change the inter-story drift distributions, and exacerbated the local reaction of key members. The influence of construction joint cannot be ignored for structures with low emergency capacity against major earthquake. Seismic design suggestions are proposed from the aspect of calculation analysis method.

Seismic Damage Analyses of Staircases in RC Frame Structures

2012 ◽  
Vol 446-449 ◽  
pp. 2326-2330 ◽  
Author(s):  
Huan Jun Jiang ◽  
Hai Yan Gao ◽  
Bin Wang
Keyword(s):  
Internal Force ◽  
Frame Structure ◽  
Frame Structures ◽  
Rc Frame ◽  
Structural Members ◽  
First Line ◽  
Strong Earthquakes ◽  
Rc Frame Structure ◽  
Rc Frame Structures ◽  
Recent Earthquakes

Staircases in Reinforced Concrete (RC) frame structures suffered severe damages in recent earthquakes although they are regarded as critically important passages during emergencies. Staircases act as the first line of defense in earthquakes, and therefore they first yield and fail. Then they lose the action of safe passages so that the anticipated seismic performance objectives cannot be satisfied. To make sure that staircases work as safe passages in strong earthquakes, the current Chinese code for seismic design of buildings claims special requirements on the design of staircases. At first, the influence of staircases on the structural behavior of a typical RC frame structure is studied by the comparison of internal force in the structural members considering and neglecting the effect of staircases under frequent earthquakes. Besides, the effect of staircases on the yielding and failing mechanism of the frame structure is investigated through static elasto-plastic analyses. From this study the reason of the damages suffered by cast-in-site staircases in RC frame structures under earthquakes can be understood.

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