Analysis of the Influence of Mortise-Tenon Joint Damage on Seismic Performance of Ancient Timber Structure

2014 ◽  
Vol 580-583 ◽  
pp. 1595-1599 ◽  
Author(s):  
Xue Liang Wang ◽  
Liang Jin
Keyword(s):  
Energy Dissipation ◽  
Seismic Performance ◽  
Joint Damage ◽  
Hysteresis Loops ◽  
Timber Structure ◽  
Dynamic Responses ◽  
Earthquake Intensity ◽  
Main Indicator ◽  
Before And After ◽  
Rare Earthquake

This research investigated the influence of mortise-tenon joint before and after damage on seismic performance of ancient lifted-beam timber structure. Dynamic responses of an ancient timber structure under various earthquake intensities were analyzed by ANSYS to extract the M-θ hysteresis loops of mortise-tenon joints before and after damage. The area of the largest hysteresis loop was taken as quantitative indicator to measure energy dissipation of mortise-tenon joints. The results shows that if some mortise-tenon joints were damaged, they dissipated much less earthquake energy decreasing by 31.8%-38.5%, and top displacement of structures increased by 1.79%-5.96% correspondingly. Moreover, the displacement under 8-degree-fortification, 7-degree-rare earthquake intensity increased most obviously. Therefore, energy dissipation of mortise-tenon joint is a main indicator to the assessment of seismic performance of a damaged ancient timber structure.

Study on Earthquake Resistant Performance of a Large Span Structure Strengthened with HADAS

2013 ◽  
Vol 405-408 ◽  
pp. 933-939
Author(s):  
Dai Guo Chen ◽  
Yong Yao ◽  
Yong Jun Deng ◽  
Hai Jun Wang
Keyword(s):  
Seismic Performance ◽  
Plastic Hinge ◽  
Large Earthquake ◽  
Internal Force ◽  
Weak Links ◽  
Original Structure ◽  
Large Span ◽  
Before And After ◽  
Under Construction ◽  
Rare Earthquake

Seismic fortification intensity has been adjusted in some areas which were affected in The Wenchuan-earthquake. It was seismic strengthening for most of the buildings especially the public buildings after the adjustment. In order to ensure the seismic performance of the structure after reinforcement ,the analysis method based on performance is gradually applied in the large and complex engineering structure analysis .The paper uses a large span Sports Training Center under construction as background. According to the situation that the fortification intensity by 6 degrees improved to 7 degrees ,the paper uses Push-over method to analysis elastic-plastic of the finite element models ,which including the mild steel damper before and after reinforcement ,under the action of the rare earthquake of 7 degrees. The paper is studying the internal force,deformation and destruction of the structure in the action of the rare earthquake,comparing the dynamic characteristics and seismic performance of the models, and researching distribution of weak links and plastic hinge of the models under the large earthquake. The results show that the models can meet collapse resistant checks less than 7 degrees of the rare earthquake before and after reinforcement. The second floor is relatively weak of the original structure,and can emerge local damage easily. But the structures stiffness is more uniformly after reinforcement, and has large resistance of the collapsed ability.

Experimental Study on Seismic Behavior of Recycled Concrete Perforated Brick Masonry

2010 ◽  
Vol 163-167 ◽  
pp. 1879-1882 ◽  
Author(s):  
Zhang Gen Guo ◽  
Wei Min Sun ◽  
Jian Wang ◽  
Jian Long Chen ◽  
Yi Fan Xu
Keyword(s):  
Energy Dissipation ◽  
Seismic Performance ◽  
Seismic Behavior ◽  
Low Frequency ◽  
Hysteresis Loops ◽  
Brick Masonry ◽  
Recycled Concrete ◽  
Load Test ◽  
Test Results ◽  
Backbone Curve

In order to investigate the seismic performance of recycled concrete perforated brick masonry, an experiment was conducted on three specimens of recycled concrete perforated brick walls subjected to low frequency reversed cyclic load test. The loading process, failure mechanism, ultimate bearing capacity was studied. The seismic behavior such as hysteretic characteristics, backbone curve, ductility, energy dissipation capacity were analyzed too. The test results show that the seismic performance of recycled concrete perforated brick masonry is similar to those of ordinary concrete perforated brick walls. The test results also indicate that the seismic behavior of recycled concrete perforated brick masonry is good. The specimens have good hysteresis loops and ductility, strong energy dissipation capacities.

Experimental and numerical study on seismic performance of steel reinforced recycled concrete frame structure under low-cyclic reversed loading

2018 ◽  
Vol 21 (12) ◽  
pp. 1895-1910 ◽  
Author(s):  
Jianyang Xue ◽  
Xin Zhang ◽  
Rui Ren ◽  
Lei Zhai ◽  
Linlin Ma
Keyword(s):  
Energy Dissipation ◽  
Seismic Performance ◽  
Numerical Study ◽  
Concrete Strength ◽  
Hysteresis Loops ◽  
High Energy ◽  
Recycled Concrete ◽  
Frame Structure ◽  
Concrete Frame ◽  
Reversed Loading

This article mainly focused on the seismic performance of steel reinforced recycled concrete frame structure under low-cyclic reversed loading. To evaluate seismic performance of steel reinforced recycled concrete frame structure, a two-span three-storied steel reinforced recycled concrete frame was conducted at civil engineering laboratory of Xi’an University of Architecture and Technology. Experimental and numerical studies were implemented to investigate the crack status, failure modes, hysteresis loops, skeleton curves, energy dissipation capacity, load–displacement curves, P-Δ effect, and the influence of recycled concrete strength under low-cyclic reversed loading. Results indicate that the steel reinforced recycled concrete frame structure has good seismic behavior during test, and the spindle-shaped hysteresis loops illustrate that the frame has relatively high energy dissipation capacities. The design of steel reinforced recycled concrete frame satisfied the requirements of strong column weak beam, strong shear weak bending, and strong joint weak components. Finally, the simulated results obtained by OpenSees software agree well with the test, which verify the rationality and reliability of the proposed model. The conclusions of this article will be helpful for the design of steel reinforced recycled concrete structures in seismic regions.

scholarly journals Seismic Response Mitigation of a Television Transmission Tower by Shape Memory Alloy Dampers

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 6987
Author(s):  
Jingbo Wu ◽  
Bo Chen ◽  
Lunhai Zhi ◽  
Xinxin Song
Keyword(s):  
Equations Of Motion ◽  
Hysteresis Loops ◽  
Dynamic Responses ◽  
Temperature Hysteresis ◽  
Transmission Tower ◽  
Seismic Excitations ◽  
Earthquake Intensity ◽  
Structural Dynamic ◽  
Control Approach ◽  
Transmission Towers

High-rise television transmission towers are of low damping and may vibrate excessively when subjected to strong earthquakes. Various dynamic absorbers and dampers are proposed to protect television transmission towers from excessive vibrations and damages. Up to now, the seismic damage reduction in television towers, using SMA dampers under seismic excitations, has not been conducted. To this end, the response reduction in a flexible television tower, disturbed by earthquakes using SMA dampers, is conducted in this study. A two-dimensional dynamic model is developed for dynamic computation at first. The mathematical model of an SMA damper is proposed, and the equations of motion of the tower, without and with, are established, respectively. The structural dynamic responses are examined in the time and the frequency domain, respectively. The effects of damper stiffness, service temperature, hysteresis loops, and earthquake intensity on control efficacy are investigated in detail. In addition, the power spectrum density curves, of dynamic responses and the energy responses, are compared to provide deep insights into the developed control approach. The control performance of SMA dampers is compared with that of widely-used friction dampers. The analytical observations indicate that SMA dampers with optimal parameters can substantially reduce the vibrations of TV transmission towers under seismic excitations.

scholarly journals Seismic Performance of Deposit Slopes with Underlying Bedrock before and after Reinforcement by Stabilizing Piles

2021 ◽  
Vol 11 (12) ◽  
pp. 5664
Author(s):  
Zhiliang Sun ◽  
Lingwei Kong ◽  
Wei Bai ◽  
Yong Wang
Keyword(s):  
Seismic Performance ◽  
Seismic Waves ◽  
Shaking Table ◽  
Dynamic Responses ◽  
Ground Acceleration ◽  
Stabilizing Piles ◽  
Multi Stage ◽  
Before And After ◽  
Table Model ◽  
Input Motion

The seismic performance of stabilizing piles used to reinforce underlying bedrock in a deposit slope is a complex soil–structure interaction problem. Two centrifuge shaking table model testswere conducted to ascertain the dynamic responses of the underlying bedrock deposit slopes without and with the use of stabilizing piles during an earthquake. Multi-stage seismic waves with various peak accelerations were applied from the bottom of each model. The differencesin the response accelerations between the deposit and bedrock increase significantly with the increase in amplitude of the input seismic waves. The presence of the rock-socketed stabilizing piles can bridge the uncoordinated movement of the bedrock and the overlying deposit to some extent. The resultant force arising from a distributed load increment on the piles caused by an earthquake is mainly concentrated in the upper part. With increases in the peak ground acceleration of the input motion, the resistance of the bedrock in front of the stabilizing piles increases and the peak resistance under the bedrock surface of the stabilizing piles gradually moves downwards.This finding indicates that the strong seismic motion significantly changes the embedded working state of the stabilizing pile.

Study on Seismic Performance of Unsymmetrical K-Type Friction Energy Dissipation Brace

2013 ◽  
Vol 353-356 ◽  
pp. 1879-1882
Author(s):  
Yi Xiang Xu ◽  
Wen Pan ◽  
Sheng Lan Zhu
Keyword(s):  
Energy Dissipation ◽  
Seismic Performance ◽  
Time History ◽  
Frame Structure ◽  
Reinforced Concrete Frame ◽  
Concrete Frame ◽  
Finite Element Software ◽  
Friction Energy ◽  
To Come ◽  
Rare Earthquake

The multi-storey reinforced concrete frame structure whose frame has been added with a kind of unsymmetrical K-type friction energy dissipation brace is taken as an example in this article. The time history analysis of different angles of unsymmetrical K-type friction energy dissipation brace and symmetrical K-type friction energy dissipation brace under the rare earthquake has been done by using the finite element software SAP2000. The analysis and comparison on the seismic performance shows that symmetrical K-type friction energy dissipation brace under certain conditions. Plan layout could be more flexible by using the result obtained which could become a reference for design in days to come.

Comparing the Seismic Performance of Beam-Column Joints with and without SFRC when Subjected to Cyclic Loading

2012 ◽  
Vol 626 ◽  
pp. 85-89 ◽  
Author(s):  
Kay Dora Abdul Ghani ◽  
Nor Hayati Hamid
Keyword(s):  
Energy Dissipation ◽  
Cyclic Loading ◽  
Seismic Performance ◽  
Experimental Work ◽  
Concrete Beam ◽  
Steel Fiber ◽  
Precast Concrete ◽  
Experimental Results ◽  
Column Joint ◽  
Initial Cracks

The experimental work on two full-scale precast concrete beam-column corner joints with corbels was carried out and their seismic performance was examined. The first specimen was constructed without steel fiber, while second specimen was constructed by mixed up steel fiber with concrete and placed it at the corbels area. The specimen were tested under reversible lateral cyclic loading up to ±1.5% drift. The experimental results showed that for the first specimen, the cracks start to occur at +0.5% drifts with spalling of concrete and major cracks were observed at corbel while for the second specimen, the initial cracks were observed at +0.75% with no damage at corbel. In this study, it can be concluded that precast beam-column joint without steel fiber has better ductility and stiffness than precast beam-column joint with steel fiber. However, precast beam-column joint with steel fiber has better energy dissipation and fewer cracks at corbel as compared to precast beam-column joint without steel fiber.

Experimental study on seismic performance of suspended ceiling components

2021 ◽  
Author(s):  
Yong Wang ◽  
Huanjun Jiang ◽  
Chen Wu ◽  
Zihui Xu ◽  
Zhiyuan Qin
Keyword(s):  
Experimental Study ◽  
Energy Dissipation ◽  
Seismic Performance ◽  
Seismic Vulnerability ◽  
Axial Loading ◽  
Deformation Capacity ◽  
Severe Damage ◽  
Strong Earthquakes ◽  
Static Tests ◽  
Load Carrying

<p>Suspended ceiling systems (SCSs) experienced severe damage during strong earthquakes that occurred in recent years. The capacity of the ceiling component is a crucial factor affecting the seismic performance of SCS. Therefore, a series of static tests on suspended ceiling components under monotonic and cyclic loadings were carried out to investigate the seismic performance of the ceiling components. The ceiling components include main tee splices, cross tee latches and peripheral attachments. All specimens were tested under axial loading. Additionally, the static tests of cross tee latches subjected to shear and bending loadings were performed due to their seismic vulnerability. The failure pattern, load-carrying ability, deformation capacity and energy dissipation of the ceiling components are presented in detail in this study.</p>

scholarly journals Experimental Study of a New Precast Prestressed Concrete Joint

2018 ◽  
Vol 8 (10) ◽  
pp. 1871 ◽  
Author(s):  
Xueyuan Yan ◽  
Suguo Wang ◽  
Canling Huang ◽  
Ai Qi ◽  
Chao Hong
Keyword(s):  
Energy Dissipation ◽  
Seismic Performance ◽  
Prestressed Concrete ◽  
Precast Concrete ◽  
Concrete Strength ◽  
Frame Structure ◽  
Loading Test ◽  
Concrete Frame ◽  
Concrete Joints ◽  
Precast Prestressed Concrete

Precast monolithic structures are increasingly applied in construction. Such a structure has a performance somewhere between that of a pure precast structure and that of a cast-in-place structure. A precast concrete frame structure is one of the most common prefabricated structural systems. The post-pouring joint is important for controlling the seismic performance of the entire precast monolithic frame structure. This paper investigated the joints of a precast prestressed concrete frame structure. A reversed cyclic loading test was carried out on two precast prestressed concrete beam–column joints that were fabricated with two different concrete strengths in the keyway area. This testing was also performed on a cast-in-place reinforced concrete joint for comparison. The phenomena such as joint crack development, yielding, and ultimate damage were observed, and the seismic performance of the proposed precast prestressed concrete joint was determined. The results showed that the precast prestressed concrete joint and the cast-in-place joint had a similar failure mode. The stiffness, bearing capacity, ductility, and energy dissipation were comparable. The hysteresis curves were full and showed that the joints had good energy dissipation. The presence of prestressing tendons limited the development of cracks in the precast beams. The concrete strength of the keyway area had little effect on the seismic performance of the precast prestressed concrete joints. The precast prestressed concrete joints had a seismic performance that was comparable to the equivalent monolithic system.

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