Shaking table test on single segment prefabricated concrete bridge pier connected by grouting sleeve

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Junming Xu ◽  
Yanmin Jia ◽  
Dongwei Liang
Keyword(s):  
Finite Element ◽  
Seismic Performance ◽  
Shaking Table ◽  
Scale Model ◽  
Loading Test ◽  
Continuous Increase ◽  
Content Type ◽  
Finite Element Software ◽  
Crack Penetration ◽  
Strain Responses

PurposePrefabricated pier technology has the advantages of quick construction time, relatively little traffic interference and relatively small environmental impact. However, its applicability under earthquake conditions is not yet fully understood. The seismic performance and influence parameters of a prefabricated concrete pier connected by embedded grouting sleeve (GS) in a pile cap are investigated in this study.Design/methodology/approachTwo prefabricated pier scale model specimens with different reinforcement anchorage lengths and two comparative cast-in-place (CIP) pier model specimens are designed and manufactured for a seismic simulation shaking table. With the continuous increase of input ground motion strength, the changes in basic dynamic characteristics, damage development, acceleration and displacement variation laws, and pier bottom strain responses are compared among the specimen. The finite element software ABAQUS is used to simulate the test pier.FindingsThe crack location of the two prefabricated pier specimens is almost the same as that of the CIP pier specimens; CIP pier specimens show more penetrated cracks than prefabricated pier specimens, as well as an earlier crack penetration time. The acceleration, displacement and strain response of the CIP pier specimens are more affected by earthquake activity than those of the prefabricated pier specimens. The acceleration, displacement and strain responses of the two prefabricated piers are nearly identical. The finite element results are in close agreement with the acceleration and displacement response data collected from the test, which verifies the feasibility of the finite element model established in ABAQUS.Originality/valueA GS connection method is adopted for the prefabricated pier, and on the premise of meeting the minimum reinforcement anchorage length required by the code, this study explores the influences of different reinforcement anchorage lengths on the seismic performance of prefabricated piers in high-intensity areas. A shaking table loading test is used to simulate the real changes of the structure under the earthquake. This work may provide a valuable reference for the design and seismic performance analysis of prefabricated pier, particularly in terms of seismic stability.

scholarly journals Numerical Analysis on the Seismic Performance of Plane Irregular Structure Based on ABAQUS

2020 ◽  
Vol 4 (4) ◽  
Author(s):  
Lina Zong ◽  
Feng Xu ◽  
Wei Yuan ◽  
Xiaolei Ji
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Seismic Performance ◽  
Shaking Table Test ◽  
Shell Element ◽  
Element Model ◽  
Shaking Table ◽  
Analysis Model ◽  
Finite Element Software ◽  
Open Hole

Rod element and shell element were used in finite element software ABAQUS to establish dynamic elastic-plastic analysis model of the structure, the seismic performance of an irregular plane complex overrun structure numerical simulation, the structure was calculated under different input level and displacement response of the acceleration response, and analyses the force of the wear layer column and the floor of the open hole stress level. The results were compared with the shaking table test to verify the accuracy of the numerical simulation results. The results of numerical calculation were basically consistent with the experimental results, and the finite element model basically reflected the response of the structure under the simulated earthquake.

scholarly journals Low Cost Frictional Seismic Base-Isolation of Residential New Masonry Buildings in Developing Countries: A Small Masonry House Case Study

2017 ◽  
Vol 11 (1) ◽  
pp. 1026-1035 ◽  
Author(s):  
Ahmad Basshofi Habieb ◽  
Gabriele Milani ◽  
Tavio Tavio ◽  
Federico Milani
Keyword(s):  
Finite Element ◽  
Seismic Vulnerability ◽  
Base Isolation ◽  
Low Cost ◽  
Element Model ◽  
Shaking Table ◽  
Fe Model ◽  
Isolation System ◽  
Finite Element Software ◽  
Non Linear

Introduction:An advanced Finite Element model is presented to examine the performance of a low-cost friction based-isolation system in reducing the seismic vulnerability of low-class rural housings. This study, which is mainly numerical, adopts as benchmark an experimental investigation on a single story masonry system eventually isolated at the base and tested on a shaking table in India.Methods:Four friction isolation interfaces, namely, marble-marble, marble-high-density polyethylene, marble-rubber sheet, and marble-geosynthetic were involved. Those interfaces differ for the friction coefficient, which was experimentally obtained through the aforementioned research. The FE model adopted here is based on a macroscopic approach for masonry, which is assumed as an isotropic material exhibiting damage and softening. The Concrete damage plasticity (CDP) model, that is available in standard package of ABAQUS finite element software, is used to determine the non-linear behavior of the house under non-linear dynamic excitation.Results and Conclusion:The results of FE analyses show that the utilization of friction isolation systems could much decrease the acceleration response at roof level, with a very good agreement with the experimental data. It is also found that systems with marble-marble and marble-geosynthetic interfaces reduce the roof acceleration up to 50% comparing to the system without isolation. Another interesting result is that there was little damage appearing in systems with frictional isolation during numerical simulations. Meanwhile, a severe state of damage was clearly visible for the system without isolation.

A computational model for diffusion-reaction-deformation coupled problems and its finite element implementation

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Bao Qin ◽  
Yexin Zhou ◽  
Zheng Zhong
Keyword(s):  
Finite Element ◽  
Chemical Reaction ◽  
Reaction Rate ◽  
Diffusion Processes ◽  
Diffusion Reaction ◽  
Governing Equations ◽  
Content Type ◽  
Finite Element Software ◽  
And Diffusion ◽  
Reaction And Diffusion

PurposeA diffusion-reaction-deformation coupled model is employed and implemented as a user-defined element (UEL) subroutine in the commercial finite element software package ABAQUS.Design/methodology/approachChemical reaction and diffusion are treated as two distinct processes by introducing the extent of reaction and the diffusion concentration as two kinds of independent variables, for which the independent governing equations for chemical reaction and diffusion processes are obtained. Furthermore, an exponential form of chemical kinetics, instead of the linearly phenomenological relation, between the reaction rate and the chemical affinity is used to describe reaction process. As a result, complex chemical reaction can be simulated, no matter it is around or away from equilibrium.FindingsTwo numerical examples are presented, one for validation of the model and another for the modeling of the deflection of a plane caused by a chemical reaction.Originality/value1. Independent governing equations for diffusion and reaction processes are given. 2. An exponential relation between the reaction rate and its driving force is employed. 3. The UEL subroutine is used to implement the finite element procedure.

Design and fabrication of transfer seat system for disabled drivers

2019 ◽  
Vol 16 (1) ◽  
pp. 14-22
Author(s):  
Sampath S. ◽  
Chithirai Pon Selvan M. ◽  
Mohamed Ameen K. ◽  
Mohamed Amin I.
Keyword(s):  
Finite Element ◽  
Design Process ◽  
Load Capacity ◽  
Operating Time ◽  
Disabled Persons ◽  
Present System ◽  
Physical Test ◽  
Content Type ◽  
Finite Element Software ◽  
Design Calculations

PurposeThe purpose of this paper is to present the design and development of transfer seat system which aids the disabled drivers to get in and out of the car without outside help thereby reducing physical effort. The design of the model is carried out taking into account the vehicle specification and the weight of the person. After careful measurement and analysis, the required seat system parameters were estimated. The three movements associated with the system are satisfied with motors controlled by switches. The design calculations and the tests carried out are validated using the ANSYS finite element software.Design/methodology/approachThe whole process begins with the definition of the problem of eliminating the support of an additional person to help people with disabilities enter and leave a car, making it feasible and economical for the patients. Literature review includes and develops information from different sources. The research gap is identified and a necessary improvement is proposed. Design and analysis involves optimum design and calculation that achieves the efficiency, reliability and comfortable movement of the system. It also involves validation to support stress analysis in the system that is performed using ANSYS. The material supply includes the required materials taking into account factors such as strength, durability and availability. Manufacturing selects appropriate manufacturing techniques taking into account design, materials and space limitation. Operations such as welding, cutting, drilling and grinding are considered. The tests consist of performing a physical test to check the approximate load capacity of the system for a gentle, comfortable and secure comfort. Validation ensures that the results of the test coincide with the existing results of the supporting documentation. This process also involves taking corrective action and re-doing the design process to achieve the desired results.FindingsThe results that are plotted suggest that with the increase in downward force, the power required to balance it is greater. Similarly, the speed increases with increasing power. ANSYS analysis can be performed for the support structure and for obtaining deformation. The entire work can be implemented on the actual vehicle, and the time required for the patient to enter and exit could be calculated. The entire transfer system that operates by the engine can be modified, and a hydraulic system can be used to make the movements possible. The section of the rail can also be modified accordingly, and the comparison of the possible results can be carried out with the present system.Research limitations/implicationsThe entire system can be improvised by working on the mechanism which reduces the overall operating time without causing discomfort to the user when entering and exiting the car. Furthermore, the safety feature must be considered in the car to prevent the mechanism from altering the seating position of the seat, for which a mooring system can be inserted with a switch to hold it in place and release it. A powerful motor can be integrated into the mechanism to improvise the second movement, which is the deployment of the legs on the ground with the motorized wheels. The set of cast iron rails is used to support more weight without failure.Practical implicationsThe main objective is to design a system that allows a disabled person to enter and exit easily without the support or assistance of a second person. The design process had to be modified, and various methods were tried to incorporate this flawless movement onto the chassis of the car. Necessary changes have been made in the case of the material used and of the yarn to obtain the desired movement at the desired speed at the desired time. By performing these three movements, the secondary objective had to be integrated into the system to automate the door to facilitate the entry and exit of the car and to open the door simply by pressing a button. These results were taken into account to make the engine speed changes and the speed at which the chair will descend and move horizontally to ensure a safe design.Social implicationsThe developed transfer seat system can be widely used in healthcare sectors which greatly helps the movement of disabled persons.Originality/valueThe design calculations and tests carried out are validated using the ANSYS®, a finite element software.

Linear analysis of a two-dimensional multistorey reinforced concrete frame under high temperature at different column locations

2019 ◽  
Vol 10 (3) ◽  
pp. 317-323 ◽  
Author(s):  
Parthasarathi N. ◽  
Satyanarayanan K.S. ◽  
Thamilarau V. ◽  
Prakash M. ◽  
Adithya Punnapu
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
High Temperature ◽  
Lateral Displacement ◽  
Progressive Collapse ◽  
Linear Analysis ◽  
Rc Frame ◽  
Reinforced Concrete Frame ◽  
Content Type ◽  
Finite Element Software

Purpose The purpose of this study is to investigate the influence of progressive collapse under high temperature for a reinforced concrete (RC) frame. An analytical programme was analysed for a two-bay five-storey RC frame exposed to high temperature at different column locations. Design/methodology/approach The effects of high temperature protections and locations (i.e. corner, middle and intermediate) on collapse conditions and load distributions were studied for the steady-state linear analysis using finite element software. Findings The results show that the frame will not collapse suddenly at temperatures up to 400°C. This is attributed to an increase in the deflections of the column, which increases the lateral displacement of adjacent heated columns and governs their buckling. This indicates that the temperature rating in the column against collapse can occur at a range of 500°C-600°C compared to that of individual members. The collapse pattern of RC frames designed as ordinary moment resisting frames, and under ordinary load, combinations is based on GSA guidelines. The results for displacement, stress and axial force were collected and discussed. Originality/value The two-bay five-storey frame has been created in finite element software, and linear analysis is used to perform this study with a different temperature.

scholarly journals Shaking Table Model Test and Seismic Performance Analysis of a High-Rise RC Shear Wall Structure

2019 ◽  
Vol 2019 ◽  
pp. 1-17 ◽  
Author(s):  
Shujin Li ◽  
Cai Wu ◽  
Fan Kong
Keyword(s):  
Seismic Performance ◽  
Model Test ◽  
Shaking Table Test ◽  
Technical Specification ◽  
Shaking Table ◽  
Scale Model ◽  
Wall Structure ◽  
High Rise ◽  
Table Model ◽  
Shaking Table Model Test

A building developed by Wuhan Shimao Group in Wuhan, China, is a high-rise residence with 56 stories near the Yangtze River. The building is a reinforced concrete structure, featuring with a nonregular T-type plane and a height 179.6 m, which is out of the restrictions specified by the China Technical Specification for Concrete Structures of Tall Building (JGJ3-2010). To investigate its seismic performance, a shaking table test with a 1/30 scale model is carried out in Structural Laboratory in Wuhan University of Technology. The dynamic characteristics and the responses of the model subject to different seismic intensities are investigated via the analyzing of shaking table test data and the observed cracking pattern of the scaled model. Finite element analysis of the shaking table model is also established, and the results are coincident well with the test. An autoregressive method is also presented to identify the damage of the structure after suffering from different waves, and the results coincide well with the test and numerical simulation. The shaking table model test, numerical analysis, and damage identification prove that this building is well designed and can be safely put into use. Suggestions and measures to improve the seismic performance of structures are also presented.

Finite Element Analysis of Horizontal Reinforcement Ratio's Effect on Seismic Performance of Autoclaved Aerated Concrete Block Masonry

2011 ◽  
Vol 413 ◽  
pp. 326-330
Author(s):  
Hui Ge Wu ◽  
Hui Lai Luo ◽  
Jie Gu
Keyword(s):  
Finite Element ◽  
Bearing Capacity ◽  
Seismic Performance ◽  
Concrete Block ◽  
Reinforcement Ratio ◽  
Element Analysis ◽  
Finite Element Software ◽  
Autoclaved Aerated Concrete ◽  
Shearing Strength ◽  
Aerated Concrete

Non-linear analysis of autoclaved aerated concrete (AAC) block masonry composite wall with column has been conducted using finite element software ABAQUS. First, the finite element results were verified with laboratory results of full-scale specimens. Effects of horizontal reinforcement ratio on seismic performance were investigated. The analysis indicates that shearing strength of the wall is affected by the openings greatly. Seismic performance is improved with the increase of horizontal reinforcement ratio. The effect of vertical stress on wall without openings is more than that on wall with openings. Bearing capacity of walls without openings has a linear relationship with the horizontal reinforcement ratio. And bearing capacity of walls with openings is related to the place where the reinforcements are installed as well as the horizontal reinforcement ratio.

Discussion of Different Methods of Strengthening Masonry Walls with Constructional Column

2012 ◽  
Vol 226-228 ◽  
pp. 1098-1101
Author(s):  
Cheng Wang ◽  
Yong Kun Luo ◽  
Xiao Long Xu
Keyword(s):  
Finite Element ◽  
Seismic Performance ◽  
Large Scale ◽  
Rapid Development ◽  
Masonry Wall ◽  
Earthquake Resistance ◽  
Masonry Walls ◽  
Finite Element Software ◽  
Engineering Discipline ◽  
Constructional Column

With the rapid development of economy and the civil engineering discipline, the seismic performance of existing masonry wall can't satisfy the codes and regional seismic requirements. As a result, strengthening the earthquake resistance of it is put on the agenda. Using large-scale finite element software-abaqus, this paper analyzes different methods of strengthening masonry walls by constructional columns. Under the premise of the cross area of the columns used to reinforce is identical, it shows that the wall strengthened by bilateral constructional columns has a better seismic performance than by unilateral constructional column. The ductility coefficient of the former increases 49.4% than the original masonry, while the latter increases 26.3%. The bilateral constructional column could significantly improve the integrity and ductility of the masonry wall, so does the seismic performance. It has engineering sense for the strengthening work.

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.

Sign in / Sign up

Export Citation Format

Share Document