scholarly journals ESTIMATION OF STORY DRIFT ANGLE FROM CONNECTION DEFORMATION AND PROPOSAL OF SENSOR RECORDING MAXIMUM DEFORMATION OF COLUMN-TO-BEAM CONNECTION OF WOODEN FRAME STRUCTURE

2010 ◽  
Vol 75 (649) ◽  
pp. 609-616
Author(s):  
Mitsuhiro MIYAMOTO ◽  
Haruki TAKAHASHI ◽  
Takeshi MORII ◽  
Noriko TAKIYAMA ◽  
Yasuhiro HAYASHI
Keyword(s):  
Frame Structure ◽  
Drift Angle ◽  
Maximum Deformation ◽  
Wooden Frame ◽  
Story Drift

Statistical Analyses of Steel Frame Structure Drift Angle

2012 ◽  
Vol 204-208 ◽  
pp. 1102-1108
Author(s):  
Huan Huan Xia ◽  
Wen Feng Liu ◽  
Yan Qiang Gao
Keyword(s):  
Seismic Performance ◽  
Test Data ◽  
Steel Frame ◽  
Statistical Analyses ◽  
Frame Structure ◽  
Limit Values ◽  
Drift Angle ◽  
Performance Levels ◽  
Story Drift ◽  
Steel Frame Structure

Story drift angle is one of the main indexes to test the seismic performance of building structures. American seismic code of buildings FEMA273/274 respectively provide the limit values of story drift angle in two kinds structural systems, steel frame and steel-support frame. This article collects 40 groups steel frame test data and 24 groups steel-support frame test data. By the statistical analyses of story drift angle and the comparison to the drift angle limit values in different countries, the seismic performance levels of steel frame structure are divided into six,Ⅰ,Ⅱ,Ⅲ,Ⅳ,Ⅴand Ⅵ, and the suggested limit values of story drift angle corresponding with performance levels are given.

scholarly journals Estimation Method of Maximum Inter-Story Drift Angle of Wood-Frame House using Two Accelerometers

2021 ◽  
Keyword(s):  
Health Monitoring ◽  
Main Shock ◽  
Integration Method ◽  
Damage Index ◽  
Estimation Method ◽  
High Accuracy ◽  
2016 Kumamoto Earthquake ◽  
Drift Angle ◽  
Story Drift ◽  
Wood Frame

Abstract. In April 2016, Kumamoto earthquake occurred in Japan and many wooden houses collapsed and many lives were lost because of the second and larger main shock. As a result, the need for Structural Health Monitoring (SHM) for wooden houses is receiving increased attention. In the SHM system, maximum inter-story drift angle is considered as the damage index. We assume that the first story of a wooden house will be damaged so that we need only to focus on the response of this first story. Hence, we install accelerometers on the ground floor and the second floor. In order to estimate the inter-story drift angle, we need to integrate the acceleration records twice. The simple double integration will result in erroneous results. Thus, in this paper, we propose the most appropriate integration method to estimate the maximum story drift angle with high accuracy using two accelerometers.

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.

Seismic Displacement Design Method Comparison between Chinese, American, European and Japanese Seismic Design Codes

2013 ◽  
Vol 859 ◽  
pp. 43-47
Author(s):  
Gui Ming Zhang ◽  
Wen Feng Liu ◽  
Zhi Hong Chen
Keyword(s):  
Seismic Design ◽  
Design Method ◽  
Method Comparison ◽  
Chinese American ◽  
Frame Structure ◽  
Design Codes ◽  
Reinforced Concrete Frame ◽  
Seismic Displacement ◽  
Story Drift ◽  
Earthquake Action

Seismic displacement design method and allowable values of story drift are compared between Chinese, American, European and Japanese seismic design codes. An engineering example's seismic displacement is calculated in the methods given by the four codes, and story drift are compared. Researches show that allowable story drift of Chinese code under rare earthquake action is approximately close to that of American with a 10% probability of exceedance in 50 years, and allowable story drift of Japanese code is more rigorous than other three codes. For three-story three-span reinforced concrete frame structure, in the condition of same intensity, displacement of Chinese under the earthquake action with 2~3% exceeding probability of 50-year is greater than that of American and European with 10% exceeding probability of 50-year. However, intensity plays no role in Japan's displacement calculation, and the calculation result of displacement of Japanese code is less than other three codes.

Evolution of Design Code Requirements for Exterior Elements and Connections

2005 ◽  
Vol 21 (1) ◽  
pp. 213-224 ◽  
Author(s):  
Brian J. Sielaff ◽  
Richard J. Nielsen ◽  
Edwin R. Schmeckpeper
Keyword(s):  
Precast Concrete ◽  
Lateral Force ◽  
Frame Structure ◽  
Building Code ◽  
Seismic Zone ◽  
Seismic Rehabilitation ◽  
Story Drift ◽  
Moment Resisting ◽  
Design Requirements ◽  
Steel Frame Structure

Seismic design requirements for precast concrete cladding panel connections have evolved significantly over the past fifty years. This paper summarizes the pertinent requirements from the Uniform Building Code from 1967 to 1997, and the International Building Code 2000. A hypothetical design illustrates how emphasis in the code has evolved for both lateral force requirements and story drift displacement requirements arriving at a balance of moderate lateral force and displacement requirements. The numerical results are based on a hypothetical case of panel connections for a ten-story moment-resisting steel frame structure built in seismic Zone 4. This historical summary is of value to designers who deal with the seismic rehabilitation of precast panel connections.

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.

The excavation of the Huahaizi No. 3 Site in Qinghe County, Xinjiang

2017 ◽  
Vol 17 (1) ◽  
pp. 152-161
Keyword(s):  
Scientific Data ◽  
Frame Structure ◽  
Main Body ◽  
The Moon ◽  
Archaeological Remains ◽  
Southern Siberia ◽  
Wooden Frame ◽  
Human Bones ◽  
Celestial Bodies

AbstractThe main body of the site of Huahaizi No. 3 in Qinghe (Qinggil) County, Xinjiang, is a stone cairn surrounded by a stone circle with cross-shaped spokes. Around it, stone circles and stone cairns for sacrifices are located. In addition to two deer stones, shield-shaped stones, a simple wooden frame structure and fragments of human bones and sheep teeth used as sacrifices were found. The scientific data and the style of the deer stones show that this site was in use from around the 9th century BCE. The archaeological remains and artifacts show that this site and similar remains are for sacrificial activities, which might be related to the worship of sun, the moon and other celestial bodies or phenomena. The Sandaohaizi Site and similar remains found nearby as well as at the Arzhan kurgans in Tuva, Southern Siberia would have been left by the same people; Sandaohaizi was the summer ritual center of this early nomadic society and Arzhan was its royal necropolis.

The Research on Ultimate Displacement Angle of Concrete Columns with High-Strength Materials

2013 ◽  
Vol 742 ◽  
pp. 51-55
Author(s):  
Guo Fu
Keyword(s):  
Reinforced Concrete ◽  
Deformation Behavior ◽  
High Strength Concrete ◽  
High Strength ◽  
Concrete Column ◽  
Reinforced Concrete Column ◽  
Drift Angle ◽  
Story Drift ◽  
Displacement Angle ◽  
Ultimate Displacement

Not collapse under strong earthquake is an important goal of the seismic design of reinforced concrete structure, seismic collapse resistance performance is directly affected by the deformation behavior of reinforced concrete column. The application of high-strength steel, high-strength stirrup and high-strength concrete can enhance the concrete material properties and mechanical properties of reinforced concrete column, but their deformation behavior have large differences. The research on the seismic performance of columns with high-strength materials, especially its deformation behavior, become the most important issue of anti-collapse analysis. In this paper, the ultimate displacement angle of concrete columns with high-strength materials were collected, the ultimate displacement angle and inter-story drift angle 1/50 were compared and analyzed. The results show that the average of ultimate displacement angle of the reinforced concrete column with high-strength stirrup and high-strength longitudinal bars are 0.0469, 0.0312, respectively, greater than inter-story drift angle 1/50, while the average of ultimate displacement angle with high-strength concrete and high-strength core concrete are 0.0147, 0.0167, less than 1/50, therefore, it is not suitable for taking 1/50 as the critical value of structure collapse with high-strength concrete. The inter-story drift angle should be different in the anti-collapse analysis.

scholarly journals ESTIMATION OF STORY DRIFT ANGLE USING OPTICAL FLOW

2015 ◽  
Vol 21 (48) ◽  
pp. 645-648 ◽  
Author(s):  
Shiho KATSURAGI ◽  
Akira MITA
Keyword(s):  
Optical Flow ◽  
Drift Angle ◽  
Story Drift
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