A Comparative Study on Seismic Reinforcement Test of Beijing Rural Brick Building

2011 ◽  
Vol 194-196 ◽  
pp. 1951-1957
Author(s):  
Wei Yang ◽  
Man Sheng Wang ◽  
Er Yu Zhu ◽  
Yu Cheng
Keyword(s):  
Concrete Columns ◽  
Load Resistance ◽  
Masonry Structure ◽  
Comparison Process ◽  
Systematic Analysis ◽  
Static Test ◽  
Steel Mesh ◽  
Mortar Strength ◽  
Energy Dissipation Capacity ◽  
Lateral Load Resistance

In terms of the characteristics of Beijing masonry Structure, the quasi-static test is performed to the rural single-storey brick structure in the study. There are four sets of test specimens discussed in the paper. The first and second specimens are the unreinforced wall with different mortar strength and used for reference purpose, the others are the specimens which are strengthened by using steel mesh mortar and reinforced concrete columns with ring beam respectively. The testing phenomena of all specimens are compared in the paper. Meanwhile, the three parameters of lateral load resistance，hysteretic curve and deformability capacity are concerned in comparison process. Moreover, the mechanism of resistance and energy dissipation capacity of both reinforcement methods are analyzed in the study, and then the steel mesh mortar will be a proper method to use in the Beijing rural brick building seismic reinforcement. The systematic analysis in the paper provides theory basis on the seismic reinforcement in the Beijing rural reconstruction.

Seismic Strengthening of Masonry School Building with Steel Mesh Mortar Splint

2013 ◽  
Vol 351-352 ◽  
pp. 382-385 ◽  
Author(s):  
Hao Wu ◽  
Shi Chun Zhao ◽  
Hu Xu
Keyword(s):  
Failure Mechanism ◽  
Masonry Structure ◽  
School Buildings ◽  
Seismic Strengthening ◽  
Load Bearing Capacity ◽  
Characteristic Energy ◽  
Static Test ◽  
Steel Mesh ◽  
Energy Dissipation Capacity ◽  
Damage Characteristic

Quasi-static test on a half-scale two-story masonry model was carried out to study the seismic strengthening performance and damage characteristic of existing masonry school buildings. The wall piers between openings were partially strengthened with steel mesh mortar splint where the steel mesh is reliably anchored using vertical reinforcements. The results show that strong pier-weak spandrel failure mechanism is guaranteed due to the formation of global failure mechanism. The failure characteristic, energy dissipation capacity and load bearing capacity of masonry structure are significantly improved.

Test Study on the Rigidity Degradation and Energy Dissipation of High-Strength Reinforced Concrete Columns with Central Reinforcement

2010 ◽  
Vol 163-167 ◽  
pp. 398-405
Author(s):  
San Sheng Dong ◽  
Zi Xue Lei ◽  
Jun Hai Zhao
Keyword(s):  
Energy Dissipation ◽  
High Strength ◽  
Concrete Columns ◽  
High Energy ◽  
Affecting Factors ◽  
Static Test ◽  
Test Study ◽  
Core Areas ◽  
Energy Dissipation Capacity ◽  
High Energy Dissipation

Based on the pseudo-static test of 6 high-strength RC columns with central reinforcement skeletons, this paper studied their hysterisis performance, degradation of strength and rigidity, and energy dissipation capacity, with the affecting factors analyzed. The result shows that the central reinforcement skeletons can compensate for the low plasticity and brittle failure susceptibility of high-strength concrete so that all the specimens have stable strength, slow rigidity degradation and high energy dissipation capacity at later stage of loading; the larger the core areas the higher the strengths and ductility of the specimens, but slightly faster the degradation of strength and energy dissipation capacity as compared with the specimens with smaller core areas; the spacing of ties, longitudinal reinforcement ratio of core area both influence the strength degradation and energy dissipation capacity of the specimens, but they have little effect on their strengths.

The Research for Cylinder Pressure and Penetration Method in Comprehensive Testing Mortar Strength

2013 ◽  
Vol 275-277 ◽  
pp. 1194-1198
Author(s):  
Xiao Chuang Peng ◽  
Shao Hui Chen
Keyword(s):  
Synthesis Method ◽  
Masonry Structure ◽  
Detection Technique ◽  
Mathematical Statistics ◽  
Cylinder Pressure ◽  
Paper Briefly ◽  
Data Correction ◽  
Pressure Method ◽  
Mortar Strength ◽  
Pressure Injection

This paper briefly introduced the cylinder pressure - injection synthesis method which is detection masonry structure mortar strength technology principle, the technology based on the mathematical statistics method for data correction processing, and it combines the advantages between cylinder pressure method and penetration method ,and this method and more accurate and reliable than a single detection technique.

A combined experimental and numerical analysis on the seismic behavior of short reinforced concrete columns with different structural sizes and axial compression ratios

2017 ◽  
Vol 27 (9) ◽  
pp. 1416-1447 ◽  
Author(s):  
Liu Jin ◽  
Shuai Zhang ◽  
Dong Li ◽  
Haibin Xu ◽  
Xiuli Du ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Energy Dissipation ◽  
Axial Compression ◽  
Seismic Behavior ◽  
Load Capacity ◽  
Concrete Columns ◽  
Simulation Method ◽  
Reinforced Concrete Columns ◽  
Mesoscopic Simulation ◽  
Energy Dissipation Capacity

The results of an experimental program on eight short reinforced concrete columns having different structural sizes and axial compression ratios subjected to monotonic/cyclic lateral loading were reported. A 3D mesoscopic simulation method for the analysis of mechanical properties of reinforced concrete members was established, and then it was utilized as an important supplement and extension of the traditional experimental method. Lots of numerical trials, based on the restricted experimental results and the proposed 3D mesoscopic simulation method, were carried out to sufficiently evaluate the seismic performances of short reinforced concrete columns with different structural sizes and axial compression ratios. The test results indicate that (1) the failure pattern of reinforced concrete columns can be significantly affected by the shear-span ratio; (2) increasing the axial compression ratio could improve the load capacity of the reinforced concrete column, but the deformation capacity would be restricted and the failure mode would be more brittle, consequently the energy dissipation capacity could be deteriorated; and (3) the load capacity, the displacement ductility, and the energy dissipation capacity of the short reinforced concrete columns all exhibit clear size effect, namely, the size effect could significantly affect the seismic behavior of reinforced concrete columns.

Research on the Joint of Concrete-Filled Steel Tubular Column and Steel Beam

2013 ◽  
Vol 351-352 ◽  
pp. 174-178
Author(s):  
Ying Zi Yin ◽  
Yan Zhang
Keyword(s):  
Energy Dissipation ◽  
Failure Mechanism ◽  
Compression Ratio ◽  
Seismic Behavior ◽  
Strength Degradation ◽  
Steel Beam ◽  
Failure Characteristics ◽  
Static Test ◽  
Axial Compression Ratio ◽  
Energy Dissipation Capacity

With the pseudo-static test of 4 concrete-filled square steel tubular column and steel beam joint with outer stiffened ring, this paper discusses the failure characteristics, failure mechanism and seismic behavior of joints under different axial compression ratio. The analysis of the testing results shows: when reached the ultimate strength, the strength degradation and stiffness degradation of joints are slowly and the ductility is also good, the energy dissipation capacity of joints is much better.

scholarly journals Axial compression behavior of concrete masonry wallettes strengthened with cement mortar overlays

2008 ◽  
Vol 1 (2) ◽  
pp. 158-170 ◽  
Author(s):  
F. L. De Oliveira ◽  
J. B. De Hanai
Keyword(s):  
Axial Compression ◽  
Cement Mortar ◽  
High Strength ◽  
Concrete Block ◽  
Masonry Wall ◽  
Compression Tests ◽  
Steel Mesh ◽  
Mortar Strength ◽  
Theoretical Approaches ◽  
Wall Strength

This paper presents the results of a series of axial compression tests on concrete block wallettes coated with cement mortar overlays. Different types of mortars and combinations with steel welded meshes and fibers were tested. The experimental results were discussed based on different theoretical approaches: analytical and Finite Element Method models. The main conclusions are: a) the application of mortar overlays increases the wall strength, but not in a uniform manner; b) the strengthening efficiency of wallettes loaded in axial compression is not proportional to the overlay mortar strength because it can be affected by the failure mechanisms of the wall; c) steel mesh reinforced overlays in combination with high strength mortar show better efficiency, because the steel mesh mitigates the damage effects in the block wall and in the overlays themselves; d) simplified theoretical methods of analysis as described in this paper can give satisfactory predictions of masonry wall behavior up to a certain level.

A Comparative Experiment on the Bond-Slip of Reinforced Concrete

2012 ◽  
Vol 226-228 ◽  
pp. 1795-1799
Author(s):  
Chuan Guo Cai ◽  
Guo Liang Chen
Keyword(s):  
Experimental Data ◽  
Reinforced Concrete ◽  
Concrete Columns ◽  
Comparative Experiment ◽  
Test Device ◽  
Static Test ◽  
Bond Slip ◽  
Repeated Load ◽  
S Curve ◽  
The One

A new test device, which can be used for measuring the stain and the displacement on the adhesive interface while the slip occurs within the reinforced concrete, is proposed and designed. With that, a comparative experiment is carried out on a group of the reinforced concrete columns bearing alternating load to obtain the τ-s curve. The hysteretic curves of these specimens are recorded timely. The result from the one-way repeated load is similar with several well-known expressions which are commonly cited at home and abroad. That from the low cycle load reveals some certain characteristic of the alternating slip, which there isn't in the static test. The experimental data could make contribution for the numerical simulation on bridge and seismic building.

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