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.

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.

Geometrically modified auxetic polyurethane foams and their potential application in impact mitigation of masonry structures

2021 ◽  
Vol 311 ◽  
pp. 125170
Author(s):  
Mohammad Asad ◽  
Tatheer Zahra ◽  
David P. Thambiratnam ◽  
Tommy H.T. Chan ◽  
Yan Zhuge
Keyword(s):  
Potential Application ◽  
Polyurethane Foams ◽  
Masonry Structures ◽  
Impact Mitigation

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.

scholarly journals CONSTRUCTION PROCESS ANALYSIS FOR A MULTI-STORY BUILDING STRUCTURE WITH FLOORS SLAB OF LONG-SPAN

2019 ◽  
Vol 28 (3) ◽  
pp. 404-419
Author(s):  
Hui Wang ◽  
Fang Yang ◽  
Bo Shen ◽  
Ke-jian Ma ◽  
Tian-hong Zheng ◽  
...  
Keyword(s):  
Process Analysis ◽  
Building Structure ◽  
Construction Process ◽  
Long Span ◽  
Story Building

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.

Exploration on the Underpinning Technology of One Masonry Structure

2011 ◽  
Vol 243-249 ◽  
pp. 5552-5556
Author(s):  
Heng Lin Lv ◽  
Chun Hua Xu ◽  
Shu Chun Zhou ◽  
Yue Xing Zhu ◽  
Shi Jie Ding
Keyword(s):  
Masonry Structure ◽  
Construction Process ◽  
Strengthening Method

Because of the change of using function of one masonry structure, its longitudinal walls need to be underpinned. The related members also need to be reinforced. This paper has a discussion on the thought of underpinning part, strengthening method and key construction process. They main involve the reinforcement of foundation, the transformation from non-bearing members to bearing members of ring beams and constructional columns. It also involves the construction points for attention during underpinning process. At last, the main points that shuold be paid attention to in strengthening deign and underpinning construction are concluded.

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