Seismic Performance Experimental Research of Added Ring-Beams and Tie-Columns Masonry Structure

2013 ◽  
Vol 368-370 ◽  
pp. 1747-1755
Author(s):  
Tie Jun Qu ◽  
Jing Yi Chen ◽  
Xian Yun Wang
Keyword(s):  
Seismic Performance ◽  
Dynamic Test ◽  
Time History ◽  
Masonry Structure ◽  
Displacement Curve ◽  
Restoring Force ◽  
Static Test ◽  
Capacity Limit ◽  
Force Displacement ◽  
Ultimate Limit

To research seismic performance of the strengthened masonry structure, the two stories masonry structure housing model with added ring-beams and tie-columns was designed and made in this paper. By inputting acceleration time-history curve of rarely earthquake of Intensity 7, the seismic response of acceleration, speed, restoring force and displacement of the strengthened masonry structure were obtained through the pseudo-dynamic test when rarely earthquake of Intensity 7 occurred. The reinforcement strain time-history curves of tie-columns root and beam-column junction were tested, then the restoring force-displacement curve of the structure was obtained. By method of pseudo-static test, the strengthened masonry structure of the ultimate limit bearing capacity, limit deformation were obtained, the cracking part and developing process were observed. Finally, comparing the data in this test with that test result of the ring-beams and tie-columns masonry structure designed based on current codes; analyzed seismic performance of the strengthened masonry structure when rarely earthquake of Intensity 7 occurred.

Experimental Study for Seismic Performance of Confined Masonry Structure

2013 ◽  
Vol 353-356 ◽  
pp. 1826-1831
Author(s):  
Tie Jun Qu ◽  
Yan Ping Wang ◽  
Xian Yun Wang
Keyword(s):  
Seismic Performance ◽  
Dynamic Test ◽  
Hysteresis Loops ◽  
Structural Response ◽  
Time History ◽  
Design Code ◽  
Restoring Force ◽  
Static Test ◽  
Confined Masonry ◽  
Made In

A two-story masonry housing model was made in this paper. According to Intensity 7, adjusted Northridge record was selected to be the ground motion input in the pseudo-dynamic test. Pseudo-dynamic test and pseudo-static test were carried out to investigate the seismic behavior of the model structure. The time-history curves of the acceleration, velocity, displacement and restoring force of the structural response were obtained besides the time-history curves of the measuring points of the structure. Also the steel strain of the tie-columns and the hysteresis loops of the structure were obtained. The result shows multi-story confined masonry structures possess superior seismic performance if coordinated with the provision specified in the current compulsory design code and it can continue to use after appropriate dressing under the rarely earthquake.

Seismic Experimental Study on Masonry Structure Strengthened by Ring-Beam and Constructional Column

2014 ◽  
Vol 1065-1069 ◽  
pp. 1418-1422
Author(s):  
Tie Jun Qu ◽  
Rong Huan Xu
Keyword(s):  
Experimental Study ◽  
Seismic Performance ◽  
Dynamic Testing ◽  
Time History ◽  
Masonry Structure ◽  
Displacement Velocity ◽  
Acceleration Response ◽  
Restoring Force ◽  
Earthquake Performance ◽  
Constructional Column

A full scale masonry model of two-floor and single bay was built in this paper and was strengthened by ring-beam and constructional column. And then pseudo-dynamic testing was conducted to study the time-history curves of displacement, velocity, acceleration response and restoring force in 7 degree rarely earthquake. Results show that the earthquake performance is steady and there are no visible cracks on the model after the testing. Windows and doors perform well because of the constraint of ring-beam and column, whereas failures often occurred when the structures were not strengthened. Seismic performance is largely improved by ring-beam and constructional column and the structure can resist 7 degree rarely earthquake.

Full-Scale Test on Seismic Performance of Masonry Structure

2012 ◽  
Vol 204-208 ◽  
pp. 2610-2617
Author(s):  
Dong An ◽  
Tie Jun Qu ◽  
Jian Wen Liang
Keyword(s):  
Seismic Performance ◽  
Dynamic Test ◽  
Masonry Structure ◽  
Full Scale ◽  
Hysteretic Behavior ◽  
Seismic Action ◽  
Static Test ◽  
Confined Masonry ◽  
Common Structure ◽  
Scale Test

For further study on effective seismic design requirements of masonry structure, two masonry buildings were designed and constructed according to common structure style in towns and villages. Two full-scale buidings were subjected to earthquake using pseudo-dynamic test and quasi-static test. This paper presents crack propagation of masonry structure, hysteretic behavior, deformation and stiffness degradation under horizontal seismic action. In this experiment, deformability and ultimate bearing capacity of confined masonry (CM) with tie-column and ring-beam is higher than common brick structure (BM). Confined masonry (CM) wall maintain integrity due to constraint of tie-column and ring-beam. These tests verify that tie-column and ring-beam system is an effective seismic requirement to enhance seismic performance of masonry structure.

Study on the Seismic Performance of Cavity Walls Constraint Masonry Construction

2013 ◽  
Vol 724-725 ◽  
pp. 1702-1708
Author(s):  
Shu Hong Zuo ◽  
Hong Lu Bai ◽  
Li Hong Xiong ◽  
Ben Yi Liu ◽  
Zhi Min Tian
Keyword(s):  
Seismic Performance ◽  
Time History ◽  
Masonry Structure ◽  
Force Model ◽  
Restoring Force ◽  
Confined Masonry ◽  
Masonry Construction ◽  
State Education ◽  
Cold Area ◽  
Dynamic Time

Cavity walls structure is unsuitable in cold area for its faultiness of poor heat-insulating property. But the cavity walls constraint masonry construction is suitable in cold area for its high heat-insulating property. Studies are carried as setting up the restoring force model of the cavity walls confined masonry structure and analyzing the dynamic time-history of cavity walls constraint masonry structure under 7 degrees small earthquake, middle earthquake or large earthquake through EL centro wave, TALF wave, Ninghe wave and Qian'an wave, which indicates that cavity walls constraint masonry construction can satisfy seismic demand of 7 degree quake. Finally, the formula for calculating the interlayer displacement of cavity walls confined masonry structure near collapse is put forward and the counting result is compared with that of dynamic time-history analyzing, which shows that the accuracy of this formula is high enough to be used for analyzing the seismic performance of cavity walls constraint masonry structure. Foundation projects: Special Basic Scientific Research for Central Public Institute (2008B002, 2010A04), Open Fund of Key Laboratory of State Education Ministroy on Urben and Engineering Safe and Disaster Diminish & Key Laboratory of Beijing on Engineering Seismic and Treatment (EESR2010-07), and High Level Talent Support Project of Heilongjiang University (HDTD2010-13).

Experiment Research on the Shock Resistance of Magnetite Concrete

2015 ◽  
Vol 744-746 ◽  
pp. 1406-1411
Author(s):  
Zhen Fu Chen ◽  
Kui Zhang ◽  
Tao Li
Keyword(s):  
Strain Rate ◽  
Dynamic Test ◽  
Time History ◽  
Dynamic Strength ◽  
Bending Test ◽  
Dynamic Strain ◽  
Displacement Curve ◽  
Dynamic Force ◽  
Whole Process ◽  
Force Displacement

Through magnetite concrete beam under the action of gravity drop hammer impact dynamic bending test, reasonable testing program was designed to realize the whole process of dynamic test data acquisition, beam load and impulse, time history curves of displacement and force dynamic force - displacement curve and dynamic strain of fracture zone curve. By observing the destruction of the different strain rate，the constitutive relation of dynamic strength changing with the loading rate and input energy was studied. At the same time, the strain rate，the fracture process of different rate of damage and the destruction form need to be found.

Discussion on Masonry Structure Model Mechanical Property Test

2012 ◽  
Vol 238 ◽  
pp. 659-662 ◽  
Author(s):  
Gong Lian Chen ◽  
Lin Jun Si
Keyword(s):  
Shaking Table Test ◽  
Mechanical Test ◽  
Dynamic Test ◽  
Masonry Structure ◽  
Shaking Table ◽  
Structure Model ◽  
Loading Test ◽  
Mixture Ratio ◽  
Static Test ◽  
Masonry Material

The problems in the mechanical test of masonry structure model were discussed in this paper, including the masonry material, similar relationship, shaking table test device, judgment of wall cracking and number of cycles in pseudo-static loading test. The conclusions are: (1) for the masonry material mechanical test, usually the size decreased the strength increased, but if the laying method and appropriate adjustments in the process of the test mixture ratio, the size effect can be greatly reduced; (2) In the dynamic test of the masonry structure, for the gravity distortion model, the common way is the external prestressing method, but in this method the tension force is not constant, which is differ from the actual situation; (3) The wall cracking can be judged when the main tension crack of the wall appeared; (4) The loading cycle in the pseudo-static test of masonry wall would be twice.

Experimental Research on Restoring Force Characteristics of Light Composite Structure

2011 ◽  
Vol 261-263 ◽  
pp. 130-136
Author(s):  
Sheng Сai Li
Keyword(s):  
Experimental Research ◽  
Composite Structure ◽  
Shear Force ◽  
Dynamic Test ◽  
Model Structure ◽  
Peak Acceleration ◽  
Base Shear ◽  
Restoring Force ◽  
Skeleton Curve ◽  
Static Test

Pseudo dynamic test and pseudo static test were carried out on 1/2 scale model of light composite structure. By experimental research, hysteretic curves of base shear force and top displacement of the model structure were got, which come from various sections of pseudo dynamic test and pseudo static test, and through hysteretic curves of base shear force and top displacement of the model structure, skeleton curve of base shear force and top displacement of the model structure can be got. Outside line of all skeleton curves was skeleton curve of the light composite structure model. By analyzing and simplifying of the skeleton curve, finally restoring force model of the model structure was obtained, so reasonable dynamic analysis method of seismic design of the model structure can be offered. Research shows that as peak acceleration of inputting seismic wave continuously grows, especially when the peak acceleration reaching 800 gal, after the model structure reached plastic stage and in the stage of pseudo static test, the hysteretic curves become fuller and fuller, which shows that, with continuous emerging and propagation of crack, the structural rigidity losses gradually, and its energy dissipation capacity increases gradually. So earthquake fortification level of not collapse when hit by rarely occurred earthquake will achieve.

Experimental Study and Theoretical Analysis on the Seismic Performance of the New Frame-Bent Structure

2011 ◽  
Vol 368-373 ◽  
pp. 104-107
Author(s):  
Long Xing Yin ◽  
Guo Liang Bai ◽  
Hong Xing Li ◽  
Xiao Wen Li
Keyword(s):  
Experimental Study ◽  
Theoretical Analysis ◽  
Seismic Performance ◽  
Thermal Power ◽  
Dynamic Test ◽  
Time History ◽  
Shear Walls ◽  
Scale Model ◽  
Structure System ◽  
History Analysis

In order to solve the problem that traditional main building for large thermal power plant cannot satisfy seismic requirements in high-intensity area, we put forward SRC frame-RC few shear walls structure system to conduct experimental study and theoretical analysis. Based on pseudo-dynamic test of 1/7 scale model and elastic-plastic time history analysis, the deformation property and capacity for dissipation of energy, as well as the failure mechanism are analyzed. The results show that the new structure system has well seismic performance, it can satisfy seismic fortification goals in 8 intensity Ⅱ zones, but the weak positions should be given enough attentions.

Experimental Research on the Seismic Behavior of Enclosing Masonry Walls Simulated the Structure of an Ancient Masonry Pagoda Strengthened with Steel Straps

2013 ◽  
Vol 353-356 ◽  
pp. 1885-1891
Author(s):  
Sheng Cai Li ◽  
Meng Ji Hu ◽  
Yong Qian
Keyword(s):  
Seismic Performance ◽  
Control Process ◽  
Single Layer ◽  
Masonry Wall ◽  
Shear Capacity ◽  
Operating Conditions ◽  
Masonry Walls ◽  
Restoring Force ◽  
Static Test ◽  
Wall Models

in this paper, four single-layer masonry wall models in1/8 scale were made by a kind of special bricks on the basis of an ancient masonry pagoda structure. The models are divided into two groups by whether there is a masonry floor in a model or not. Pseudo-static test is introduced to study the seismic performance of four models with a special load control process which is suited to masonry structure. According to the test results, the horizontal bearing capacity and ductility of each masonry walls reinforced with steel straps under horizontal low cyclic loading has been sorted out. Four nonlinear restoring force models are inferred from the experimental results and phenomena under various operating conditions. And the shear capacity calculation formula of reinforced masonry wall models is fit out. The theory and experimental study show that seismic performance of the masonry pagodas strengthened with steel straps has been improved significantly.

Effect of Undercut on the Characterization of the Mechanical Properties of Silicon Nanocantilevers with Dynamic and Static Test

2015 ◽  
Vol 645-646 ◽  
pp. 1072-1077
Author(s):  
Jia Hong Zhang ◽  
Fang Gu ◽  
Xian Ling Zhang ◽  
Min Li ◽  
Yi Xian Ge ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Effective Length ◽  
Displacement Curve ◽  
Resonant Frequencies ◽  
Static Test ◽  
Critical Point Drying ◽  
Force Displacement

The elastic mechanical properties of silicon nanocantilevers are of prime importance in biotechnology and nanoelectromechanical system (NEMS) applications. In order to make these applications reliable, the exact evaluation of the effect of the undercut on the mechanical properties of silicon nanocantilevers is essential and critical. In this paper, a numerical-experimental method for determining the effect of the undercut on resonant frequencies and Young’s modulus of silicon nanocantilevers is proposed by combining finite element (FE) analysis and dynamic frequency response tests by using laser Doppler vibrometer (LDV) as well as static force-displacement curve test by using an atomic force microscope (AFM). Silicon nanocantilevers test structures are fabricated from silicon-on-insulator (SOI) wafers by using the standard complementary metal-oxide-semiconductor (CMOS) lithography process and anisotropic wet-etch release process based on the critical point drying, which inevitably generating the undercut of the nanocantilever clamping. Combining with three-dimensional FE numerical simulations incorporating the geometric undercut, the dynamic resonance tests demonstrate that the undercut obviously reduces resonant frequencies of nanocantilevers due to the fact that the undercut effectively increases the nanocantilever length by a correct value ΔL. According to a least-square fit expression including ΔL, we extract Young’s modulus from the measured resonance frequency versus the effective length dependency and find that Young’s modulus of a silicon nanocantilever with 200-nm thickness is close to that of bulk silicon. However, when we do not consider the undercut ΔL, the obtained Young's modulus is decreased 39.3%. Based on the linear force-displacement response of 12μm long and 200nm thick silicon nanocantilever obtained by using AFM, our extracted Young’s modulus of the [110] nanocantilever with and without undercut is 169.1GPa and 133.0GPa, respectively. This error reaches 21.3%. Our work reveals that the effect of the undercut on the characterization of the mechanical properties of nanocantilevers with dynamic and static test must be carefully considered.

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