scholarly journals Study on Mortar Rebound Method for Masonry Structure Blocks of Concrete Products

2021 ◽  
Author(s):  
Yong Xu ◽  
Yusen Qu ◽  
Ben Ma ◽  
Ti Wu ◽  
Bo Shu ◽  
...  
Keyword(s):  
Research Process ◽  
Masonry Structure ◽  
Masonry Structures ◽  
Application Area ◽  
Site Testing ◽  
Technical Standards

The relevant provisions of the mortar rebound method in the national code GB/T50315 “Technical Standards for site testing of masonry engineering” is only focus on mortar rebound method of sinter bricks, but whether the rebound curve of sintered brick mortar can be used for non-sintered brick mortar is uncertain. Therefore, the rebound curve of non-sintered brick mortar needs to be further studied. The mortar rebound method of sintered bricks is used as a model for the research process for mortar rebound method of other blocks, and the mortar of three widely used blocks of concrete products in masonry structures is selected as the research object. In the end, the mortar rebound curves for mortars of three widely used blocks are obtained through relevant tests, the results showed that the mortar rebound curves of sintered brick and non-sintered brick are completely different, thus broadening the application area of the mortar rebound method.

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.

Shake Table Tests on a Masonry Structure Retrofitted with Composite Reinforced Mortar

2019 ◽  
Vol 817 ◽  
pp. 342-349
Author(s):  
Stefano de Santis ◽  
Gianmarco de Felice ◽  
Garis Lorenzo Di Noia ◽  
Pietro Meriggi ◽  
Marika Volpe
Keyword(s):  
Seismic Vulnerability ◽  
Masonry Structure ◽  
Shake Table ◽  
Masonry Structures ◽  
Shake Table Tests ◽  
Reinforced Polymer ◽  
Glass Fibre Reinforced Polymer ◽  
Fibre Reinforced Polymer ◽  
Glass Fibre Reinforced ◽  
Recent Earthquakes

Recent earthquakes have dramatically shown the seismic vulnerability of existing masonry structures and highlighted the urgent need of developing suitable strengthening solutions. In order to gain an improved understanding of the seismic response of masonry constructions and of the most appropriate technologies for their retrofitting, a shake table test was performed on a full-scale U-shaped tuff masonry structure, provided with an asymmetric plan with openings and with an inclined roof. The specimen was tested unreinforced and then repaired and retrofitted with composite reinforced mortar (CRM), comprised of a glass fibre reinforced polymer mesh applied with a lime mortar. Natural accelerograms were applied with increasing scale factor to collapse. Results provided information on the dynamic behaviour of masonry structures strengthened with CRM and on the enhancement of seismic performance provided by the retrofitting work.

scholarly journals Numerical Study on Crack Distributions of the Single-Layer Building under Seismic Waves

Complexity ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-16
Author(s):  
Fenghui Dong ◽  
Zhipeng Zhong ◽  
Jin Cheng
Keyword(s):  
Seismic Waves ◽  
Numerical Study ◽  
Single Layer ◽  
Experimental Tests ◽  
Masonry Structure ◽  
Original Model ◽  
Dynamic Responses ◽  
Masonry Structures ◽  
Reinforced Masonry ◽  
Longitudinal Cracks

This paper conducts a numerical simulation of the antiseismic performance for single-layer masonry structures, completes a study on crack distributions and detailed characteristics of masonry structures, and finally verifies the correctness of the numerical model by experimental tests. This paper also provides a reinforced proposal to improve the antiseismic performance of single-layer masonry structures. Results prove that the original model suffers more serious damage than the reinforced model; in particular, longitudinal cracks appear on bottoms of two longitudinal walls in the original model, while these cracks appear later in the reinforced model; a lot of cracks appear on the door hole of the original model, and no crack appears in the reinforced model till the end of seismic waves; seismic damage of walls in the reinforced model is obviously lighter than that in the original model; dynamic responses at all observed points of the reinforced masonry are obviously less than those of the original model. Strains at all positions of the reinforced model are obviously smaller than those of the original model. From macroscopic and microscopic perspectives, the computational results prove that the reinforced proposal proposed in this paper can effectively improve the antiseismic performance of the masonry structure.

HPFL Strip Strengthening Method for Masonry Structure

2011 ◽  
Vol 374-377 ◽  
pp. 2593-2598
Author(s):  
Shou Ping Shang ◽  
Rong Shen
Keyword(s):  
Energy Dissipation ◽  
High Reliability ◽  
Low Cost ◽  
Masonry Structure ◽  
Masonry Structures ◽  
Simple Construction ◽  
Specific Design ◽  
Engineering Structures ◽  
The Real ◽  
Strengthening Method

Due to the various advantages, e.g. low cost, simple construction and high reliability, the HPFL strip reinforcement technique has been widely used in the field of civil engineering. A survey of related literatures on the research and application of the HPFL strip reinforcement technique for Masonry structures were shown in this paper. The HPFL strip reinforcement technique can significantly improve the properties of the wall, e.g. the aseismatic capacity, shear resistant strength, ductility, energy dissipation. Moreover, based on the real engineering structures, the specific design and construction method were presented in this paper.

A Simple Method of Calculating Safety Vibrating Velocity for Single-Layer Masonry Structures in Blasting Construction

2013 ◽  
Vol 353-356 ◽  
pp. 1907-1913
Author(s):  
Xin Ying Ai ◽  
Li Hua Xu ◽  
Jia Li Yu
Keyword(s):  
Single Layer ◽  
Masonry Structure ◽  
Combined Loading ◽  
Vibration Velocity ◽  
Masonry Structures ◽  
Simple Method ◽  
Change Rate ◽  
Loading Mode ◽  
Foundation Vibration

Blasting-induced seismic wave imposes cyclic loadings on adjacent buildings and structures with a combined loading mode of tension, compression, bending, shear and torsion, and it leads to flaking of floated coat, wall cracking, developing of original cracks, etc. This paper presents a blasting case study for the excavation of Wucun tunnel in Xiamen Success Avenue. Field monitoring and numerical calculation of a typical brick masonry structure are adopted to analyze the relationships among the maximum structural displacement, peak vibration velocity of blasting-induced foundation vibration and the change rate of crack width. On the basis of the study above, a method of calculating the safe vibrating velocity for single-layer masonry structure is proposed. Meanwhile, a suggested value of the safe vibrating velocity for single-layer masonry structure is given. All the research results can be useful for the similar construction and research.

Applications of Muti-Ribbed Walls in the Strengthening of Masonry Structures with Bottom Frame

2010 ◽  
Vol 163-167 ◽  
pp. 3645-3648
Author(s):  
Peng Chang ◽  
Chang Yi Zhai
Keyword(s):  
Optimal Design ◽  
Masonry Structure ◽  
Wall Structure ◽  
Masonry Structures ◽  
Bottom Frame

As a new kind of structures, Multi-ribbed wall structure is now widely used in new-built buildings and old structures needed to be strengthened. In the field of strengthening, Masonry structure with bottom frame is often mentioned for it is vulnerable to earthquake. However, it is still widely applied in China for its agility for arrangement. So how to guarantee the safety of this kind of structure is very important. There are many methods to reinforce this style of structure, but every way has its limitations. Compared with other methods, Multi-ribbed wall structure is more proper, because its stiffness and mass can easily be changed through optimal design of different kinds of materials inside.

Seismic Reinforcement Conception Design of Existing Masonry Structure

2010 ◽  
Vol 163-167 ◽  
pp. 3448-3452
Author(s):  
Hong Wei Qi ◽  
Miao Li ◽  
Xiao Ning Huang
Keyword(s):  
Plastic Deformation ◽  
Earth Quake ◽  
Seismic Loading ◽  
Masonry Structure ◽  
Earthquake Resistance ◽  
Masonry Building ◽  
Masonry Structures ◽  
Concept Design ◽  
Seismic Bearing Capacity ◽  
Reinforcement Design

In this paper, earthquake-resistance behaviors of existing masonry structures are evaluated based on a certain masonry building. The existing masonry structure is evaluated in its defects of primary design and construction measurements, seismic bearing capacity and durability. Based on results of evaluation, the seismic reinforcement design is introduced for improving earthquake-resistance behaviors of the whole building and its weak positions. In the seismic reinforcement concept design, the ductility of the masonry structure is improved in bearing seismic loading and plastic deformation. Further more, the masonry building is reinforced for avoiding collapse due to the weak positions of its bottom and top layers, stair halls, short walls and wall corners. Evaluation results and the corresponding seismic reinforcement design are significant for safety of both existing and newly designed masonry structures in earth-quake areas.

Development of Masonry Components Protected against Moisture

2013 ◽  
Vol 860-863 ◽  
pp. 1248-1251
Author(s):  
Martin Sedlmajer ◽  
Jiri Zach ◽  
Jitka Peterková
Keyword(s):  
Surface Treatment ◽  
Potential Application ◽  
Masonry Structure ◽  
Masonry Structures ◽  
Building Structure ◽  
Construction Process ◽  
Potential Reduction ◽  
Negative Effect ◽  
Effect Of Moisture ◽  
Collective Influence

During construction process and life, a number of negative influences can have effect on masonry structures; moisture, which is undesirable in the masonry, can be one of such influences. The lower area of the masonry (plinth walling) is strained the most by the moisture. The paper deals with potential reduction of the effect of moisture in places, where the masonry structure is founded, through hydrophobization of walling units. Such solution of the issue of protection of the building structure against the influence of humidity should not have negative effect on the resulting masonry parameters, particularly not on the potential application of surface treatment materials. The collective influence of the surface treatment materials, consisting usually of plaster, and the actual masonry should be ensured.

Creep deformation of clay masonry structures: a parametric study

1998 ◽  
Vol 25 (1) ◽  
pp. 67-80 ◽  
Author(s):  
Ezzeldin Y Sayed-Ahmed ◽  
Nigel G Shrive ◽  
Dan Tilleman
Keyword(s):  
Moisture Content ◽  
Creep Behaviour ◽  
Masonry Structure ◽  
Time Dependent ◽  
Masonry Structures ◽  
Moisture Condition ◽  
Test Setup ◽  
Elastic Part ◽  
Masonry Construction ◽  
Dependent Part

When loads are applied to a masonry structure, viscoelastic behaviour is exhibited where the response can be divided into two distinct parts: an instantaneous elastic part and a time-dependent part. With the change in masonry construction during the last century, the latter portion of the response is becoming more important in the design of masonry structures. The effects of mortar type, stress level, age at loading, moisture condition, and masonry strength on the creep behaviour of clay masonry structures are examined. The results of a continuing experimental programme, begun in 1988, were used to evaluate the variations in specific creep of clay masonry with the different parameters considered. The test setup and the effect of moisture content on the creep behaviour of clay masonry are also described briefly.Key words: masonry, creep, specific creep, creep ratio, mortar type, moisture condition.

The Seismic Performance Analysis of Brick Masonry Wall between Windows with the Isolation Seam

2013 ◽  
Vol 788 ◽  
pp. 516-520
Author(s):  
Shuai Jun Han ◽  
Wen Fang Zhang
Keyword(s):  
Mechanical Characteristics ◽  
Shear Failure ◽  
Masonry Wall ◽  
Masonry Structure ◽  
Masonry Structures ◽  
Vertical Load ◽  
Light Damage ◽  
Shear Bearing Capacity ◽  
Shear Slip ◽  
Bending Failure

The wall between windows is the smallest,the most weakest anti-seisnic unit[. Under the action of a strong earthquake,the longitudinal window that parallel to the main direction,often produced Xshaped cracks due to lack of shear bearing capacity .But under the earthquake,masonry structure had goodsecsmic performance,large ductility,light damage and showed reversible,easy to repair[ and so on. Given the advantages of bending failure of the above, Professor Zhang Wenfang has proposed a new earthquake mitigation technologies in the literature [. This model avoids the whole cross-section brittle shear slip, and has good ductility after yielding. Therefore, this paper combines the free shear failure of masonry structures seismic test specimen design. And it can simulate the window wall W-1 with 10mm isolated seam,the wall W-2 between windows and the ordinary wall W-3.Compared their damage morphology and mechanical characteristics in the vertical load and horizontal loads, some useful can be got and become the basis for teoretical analysis and engineer design of masonry structures for the future.

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