Optimized sensor location for estimating story-drift angle for tall buildings subject to earthquakes

2016 ◽  
Author(s):  
Sayuki Ozawa ◽  
Akira Mita
Keyword(s):  
Tall Buildings ◽  
Sensor Location ◽  
Drift Angle ◽  
Story Drift

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.

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

scholarly journals Evaluation of the Structural Performance of a Novel Methodology for Connecting Modular Units Using Straight and Cross-Shaped Connector Plates in Modular Buildings

2020 ◽  
Vol 10 (22) ◽  
pp. 8186
Author(s):  
Sang-Sup Lee ◽  
Keum-Sung Park ◽  
Ju-Seong Jung ◽  
Kang-Seok Lee
Keyword(s):  
Longitudinal Direction ◽  
Structural Performance ◽  
Building Structures ◽  
Drift Angle ◽  
Modular Units ◽  
Strength Capacity ◽  
Story Drift ◽  
Modular Buildings ◽  
Cyclic Loading Tests ◽  
Modular Structures

The strength capacity of modular buildings is determined by the weakest part, and connections between modular units are often weaker than the modular units themselves. Thus, to verify the safety of modular structures, the structural performance of connections between modular units should be evaluated; the practical suitability of connection methods under a range of construction conditions should also be determined. In conventional modular building structures, modular units are generally connected using bolts between connector plates, interlocking devices, or steel plate welding. However, current methods are not technically or practically suitable for all types of modular buildings, such as high-rise modular buildings. Here, we describe a novel technology for connecting modular units to ensure the safety of modular structures. In this study, straight and cross-shaped metal connectors that use rectangular tubular columns and channel beams were proposed for connecting modules. Their structural performance was evaluated through cyclic loading tests by controlling the story drift angle in the width and longitudinal directions. The experimental results demonstrated that all specimens exhibited relatively stable behavior up to a drift angle of 0.04 rad, and there was a superior response in terms of energy absorption capability in the longitudinal direction results compared to the width direction. However, in comparison to the cross-shaped connector plate, the stiffness of the straight connector plate decreased as the drift angle of the column increased.

Transverse Seismic Performance Index System of Urban Mass Transit Underground Structures

2015 ◽  
Vol 744-746 ◽  
pp. 924-931
Author(s):  
Zheng Fang Dong ◽  
Feng Li Li ◽  
Qing Mei Kong
Keyword(s):  
Seismic Performance ◽  
Performance Index ◽  
Index System ◽  
Deformation Rate ◽  
Mass Transit ◽  
Underground Structures ◽  
Drift Angle ◽  
Intensity Index ◽  
Story Drift ◽  
Urban Mass Transit

The transverse seismic performance index system of urban mass transit underground structures was presented, which included both intensity index of component and overall deformation index, in order to reasonably evaluate its damage degree under seismic excitations. Intensity index of component had two grades and limit values of two levels ware provided. Overall deformation index included story drift angle for rectangular underground structures and diameter deformation rate for shield tunnels. Performance index values of urban mass transit rectangular underground structure story drift angle ware put forward by reference to modified performance index values of ground structure story drift angle, which was based on a statistical analysis for experiment data of forty-six groups concrete-filled steel tubular frames and one hundred forty-five groups steel-reinforced concrete frames and took into account similarities and differences between surface structures and underground structures. Based on relation between tunnel diameter deformation and stress state of tunnel concrete and bolts, the diameter deformation rate was derived from the analytical solution using compatibility of deformation for a segment cross section. And the diameter deformation rate was also computed by means of incremental dynamic analysis method for different sites under various earthquakes. It is found in the study that based on two performance levels, limiting value of diameter deformation rate is obtained.

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