scholarly journals Effect of Roof and Diaphragm Connectivity on Dynamic Behaviour of the PP-band Retrofitted Adobe Masonry Structures

2018 ◽  
Author(s):  
Navaratnarajah Sathiparan
Keyword(s):  
Shaking Table Test ◽  
Masonry Wall ◽  
Shaking Table ◽  
Experimental Program ◽  
Masonry Structures ◽  
Test Results ◽  
Structural Components ◽  
Masonry Unit ◽  
Seismic Safety ◽  
Lateral Drift

This paper discusses the shaking table test results of three PP-band (Polypropylene band) retrofitted quarter scale one-story masonry house models with different roof conditions. Better connections between masonry wall and roof connection are one factor to improve the seismic safety of the masonry houses. Past studies show that PP-band retrofitting improves the integrity of structural components and prevent the collapse of masonry structures during an earthquake. Although the effect of masonry unit type, surface plastering, the pitch of the PP-band mesh, PP-band connectivity in mesh and tightness of the mesh attachment to walls were studied by experiment program, the effect of the roof and its diaphragm connectivity on PP-band retrofitted masonry structure is nonexistent. Therefore, an experimental program was designed and executed for an understanding the effect of the roof and its connection on the dynamic behavior of the PP-band retrofitted box-shaped masonry house models. Results reveal that the PP-band retrofitted models with proper roof diaphragm improves the seismic behavior with respect to lateral drift, shear resistance and ductility.

scholarly journals In-Plane Strengthening Effect of Prefabricated Concrete Walls on Masonry Structures: Shaking Table Test

2017 ◽  
Vol 2017 ◽  
pp. 1-13 ◽  
Author(s):  
Weiwei Li ◽  
Weiqing Liu ◽  
Shuguang Wang ◽  
Dongsheng Du
Keyword(s):  
Shaking Table Test ◽  
Masonry Structure ◽  
Shaking Table ◽  
Strengthening Effect ◽  
Masonry Structures ◽  
Dynamic Tests ◽  
Seismic Capacity ◽  
Concrete Walls ◽  
Improvement Effect ◽  
Scaled Models

The improvement effect of a new strengthening strategy on dynamic action of masonry structure, by installing prefabricated concrete walls on the outer facades, is validated by shaking table test presented in this paper. We carried out dynamic tests of two geometrically identical five-story reduced scaled models, including an unstrengthened and a strengthened masonry model. The experimental analysis encompasses seismic performances such as cracking patterns, failure mechanisms, amplification factors of acceleration, and displacements. The results show that the strengthened masonry structure shows much more excellent seismic capacity when compared with the unstrengthened one.

scholarly journals Seismic energy response analysis of equipment-structure system via real-time dynamic substructuring shaking table testing

2019 ◽  
Vol 23 (1) ◽  
pp. 37-50 ◽  
Author(s):  
Jihong Bi ◽  
Lanfang Luo ◽  
Nan Jiang
Keyword(s):  
Real Time ◽  
Shaking Table Test ◽  
Seismic Energy ◽  
Shaking Table ◽  
Energy Calculation ◽  
Test Results ◽  
Structure System ◽  
Time Dynamic ◽  
Dynamic Substructuring ◽  
Shaking Table Testing

Dynamic equations are presented that have been deduced for a real-time dynamic substructuring shaking table test of an equipment-structure system, based on the branch mode substructure method. The equipment is adopted as the experimental substructure, which is loaded by the shaking table, while the structure is adopted as the numerical substructure. Real-time data communication occurs between the two substructures during the test. A real-time seismic energy calculation method was proposed for the calculation of energy responses, both in the experimental substructure and the numerical substructure. Taking a representative four-story steel frame/equipment model, real-time dynamic substructuring shaking table tests and overall model tests were executed. The proposed real-time dynamic substructuring shaking table testing method was verified by comparing the test results with shaking table test results for the overall model. The energy responses of each component in the equipment-structure system, using different connection types, also were studied. Changes in the connection types can lead to changes in the energy responses of the equipment-structure system, especially with respect to the equipment. The choice of the connection for the equipment-structure coupled system should take into account the operational performance objective of the equipment.

scholarly journals Research on Bending Rigidity at Flange Connections of UHV Composite Electrical Equipment

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Haibo Wang ◽  
Yongfeng Cheng ◽  
Zhicheng Lu ◽  
Zhubing Zhu ◽  
Shujun Zhang
Keyword(s):  
Numerical Simulation ◽  
Seismic Performance ◽  
Shaking Table Test ◽  
Effective Means ◽  
Electrical Equipment ◽  
Shaking Table ◽  
Calculation Formula ◽  
Test Results ◽  
Bending Rigidity ◽  
Earthquake Simulation

Pillar electrical equipment is an important part of substations. The application of composite materials in pillar equipment can facilitate the improvement of the seismic performance of electrical equipment. In this paper, the test of elastic modulus and bending rigidity was conducted for individual composite elements in insulators and arresters, and the calculation formula for bending rigidity at the composite flange cementing connections was put forward. The numerical simulation model for the earthquake simulation shaking table test of ±1,100 kV composite pillar insulators was established, in which the bending rigidity value for the flange cementing part was obtained by the test or calculation formula. The numerical simulation results were compared with the earthquake simulation shaking table test results, the dynamic characteristics and seismic response of the model were compared, respectively, the validity of the proposed calculation formula for flange bending rigidity of composite cementing parts was verified, and a convenient and effective means was provided for calculating the seismic performance of composite electrical equipment.

Shaking Table Test of Quarter Scale 20 Story RC Moment Frame Building Subjected to Long Period Ground Motions

2016 ◽  
Vol 11 (1) ◽  
pp. 97-105 ◽  
Author(s):  
Kuniyoshi Sugimoto ◽  
◽  
Kenji Yonezawa ◽  
Hideo Katsumata ◽  
Hiroshi Fukuyama ◽  
...  
Keyword(s):  
Shaking Table Test ◽  
Shaking Table ◽  
Test Results ◽  
Nonlinear Fem ◽  
Moment Frame ◽  
Building Model ◽  
Long Period ◽  
Frame Building ◽  
Long Duration ◽  
Current Design

Shaking table test of a quarter-scale 20-story reinforced concrete building model was carried out. Employed input waves were kinds of long period and long duration ground motion. Test results showed that structural slabs were fully effective for building strength, which could be expressed in detailed analysis using nonlinear FEM. However, the observed hysteretic damping after yielding was fairly smaller than the expected by the current design custom, which caused smaller and unsafe estimated response than that observed in the test.

Shaking table test on building in masonry structure with construction waste recycled brick

2014 ◽  
Vol 11 (4) ◽  
pp. 357-364
Author(s):  
Hui Su ◽  
Jian Wang ◽  
Xinpei Jiang ◽  
Yang Tan
Keyword(s):  
Seismic Behavior ◽  
Shaking Table Test ◽  
Concrete Block ◽  
Masonry Structure ◽  
Recycled Aggregate Concrete ◽  
Shaking Table ◽  
Recycled Aggregate ◽  
Test Results ◽  
Scaled Model ◽  
Construction Waste

Based on the shake table test on "tie column-ring beam-cast-in-place slab" construction waste recycled brick masonry structure, a 1/3 scaled model of 4 stories is tested to analyze the seismic behavior of the multi-storey masonry structure. The test is conducted with EL-Centro seismic wave, Taft wave and artificial wave to simulate the damages observed and the seismic response under different earthquake levels. On the basis of test results, the seismic performance of the model is good and the overall structure could satisfy seismic fortification requirements in the region of intensity 8. At the same time, there was no obvious difference between this masonry structure and recycled aggregate concrete block masonry structure. The lintel of the door and window damage seriously. The base damages more easily than the superstructure. Masonry structure with construction waste recycled brick can satisfy the requirement of the masonry structure buildings in eight degree of aseismatic design area.

Shaking Table Test on Unreinforced Stone Masonry Pagoda

2012 ◽  
Vol 166-169 ◽  
pp. 730-733 ◽  
Author(s):  
Fei Zhu ◽  
Feng Lai Wang ◽  
Xu Jie Sun ◽  
Y. Zhao
Keyword(s):  
Dynamic Behavior ◽  
Seismic Performance ◽  
Seismic Design ◽  
Shaking Table Test ◽  
Shaking Table ◽  
Cultural Value ◽  
Scale Model ◽  
Stone Masonry ◽  
Experimental Program ◽  
Ancient China

Unreinforced stone masonry pagodas have great cultural value and should be detailed investigation its mechanical properties. These buildings were not designed to resist earthquakes in ancient China, at least not in the way of current methods. The objectives of this research were to understand the dynamic behavior of unreinforced stone masonry pagoda and its seismic performance. To accomplish these, a 1/12 scale model of China Dinosaurs Pagoda was constructed and tested on shaking table. The octangle model height is 3.96m, with aspect ratio of height to width is 2.93, both parameters exceed the stipulated limit of Code for Seismic Design of Building. The model built with the stones and motars similar to the prototype materials and the arrangements. Its dynamic behavior and seismic performance were tested on the shaking table towards the free vibration and three earthquake waves. The experimental program adopted in the research is explained in this paper.

The Fracture Limit of Steel-Frame Members Under Dynamic Repeated Loads Through the Shaking Table Test

2018 ◽  
Author(s):  
Kensuke Shiomi ◽  
Yusuke Wada
Keyword(s):  
Plastic Deformation ◽  
Dynamic Load ◽  
Evaluation Method ◽  
Shaking Table Test ◽  
Seismic Analysis ◽  
Steel Frame ◽  
Shaking Table ◽  
Test Results ◽  
Structural Members ◽  
Worst Case

Recently, much larger earthquakes are considered in the seismic designs of steel-frame structures in Japan. Under these severe ground motions, it is expected that not only the elasto-plastic deformation but also the fracture of the structural members could occur during the earthquakes. And through these situations, the more advanced seismic design or evaluation method which allow the partial destruction inside the structure and prevent from the worst-case scenario like the whole collapse are coming to be demanded. One of the ways to achieve this demand is considering the effects of not only the elasto-plastic deformation but also the fracture of structural members in the seismic analysis. In order for that, it is important to clarify the fracture limit of steel-frame members precisely under the dynamic load. Many static tests to clarify the members’ ultimate behavior were conducted in the past, but the dynamic tests were not well enough. In this research, the vibration tests were conducted to clarify the fracture limit of steel-frame members under the dynamic load. The behavior of the steel-frame members until the fracture was obtained by applying the repeated dynamic bending deformation with the shaking table. Also, The FEM analysis for the shaking table test results was conducted. Through the tests and the analysis study which simulates the test results, the mechanism of the member fracture occurred in the test under the dynamic loads were examined.

A Full-Scale Shaking Table Test on Philippine Concrete Hollow Blocks (CHB) Masonry Houses

2015 ◽  
Vol 10 (1) ◽  
pp. 113-120 ◽  
Author(s):  
Hiroshi Imai ◽  
◽  
Chikahiro Minowa ◽  
Angelito G. Lanuza ◽  
Henremagne C. Penarubia ◽  
...  
Keyword(s):  
Developing Countries ◽  
Shaking Table Test ◽  
Evaluation Methods ◽  
The Philippines ◽  
Full Scale ◽  
Shaking Table ◽  
Masonry Structures ◽  
Seismic Evaluation ◽  
Hollow Block ◽  
Traditional Manner

Most of the human casualties in past earthquakes were attributed to the collapse of buildings, particularly masonry constructions in developing countries. Most of these buildings are categorized into “Non-Engineered Construction.” In effect, these structure are spontaneously and informally constructed in various countries in a traditional manner without any or with little intervention in their design by qualified architects and engineers. Unfortunately, these types of buildings have been extensively constructed in most of the seismic prone areas in developing countries. Therefore, the safety of “Non-Engineered Construction” has become one of the most urgent issues in recent years. The concrete hollow block (CHB) masonry structures have recently become common residential structures in the Philippines. A full-scale shaking table test on CHBmasonry structures of Philippine ordinary houses was conducted in Japan. This experiment aims to acquiring a better understanding of the behavior of these structures during major earthquakes, and its results will be used to produce simple seismic evaluation methods as awareness tools, and to disseminate information on safer construction of houses in the Philippines.

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