In situ repair technique of infill masonry walls in steel frames damaged after an earthquake

2019 ◽  
Vol 178 ◽  
pp. 665-679 ◽  
Author(s):  
Mohammad Soheil Ghobadi ◽  
Roohollah Ahmady Jazany ◽  
Hamidreza Farshchi
Keyword(s):  
Steel Frames ◽  
Masonry Walls ◽  
Repair Technique ◽  
Infill Masonry ◽  
In Situ Repair

The Performance of Steel-Frame Buildings with Infill Masonry Walls in the 1906 San Francisco Earthquake

2006 ◽  
Vol 22 (2_suppl) ◽  
pp. 43-67 ◽  
Author(s):  
Ronald O. Hamburger ◽  
John D. Meyer
Keyword(s):  
San Francisco ◽  
Steel Frames ◽  
Steel Frame ◽  
Earthquake Damage ◽  
Superior Performance ◽  
Masonry Walls ◽  
Ground Shaking ◽  
Frame Buildings ◽  
Steel Frame Buildings ◽  
Infill Masonry

Following the great 1906 San Francisco earthquake and fire, engineers recognized the superior performance of buildings with complete vertical load–carrying steel frames and infill masonry walls. These buildings were noteworthy in their ability to survive both the ground shaking and fire, many remaining in service today. Observation of this superior performance led many California structural engineers to believe that steel frames were the best structural system for resisting earthquake damage, in turn, leading to a proliferation of steel-frame construction in California cities. Not until the 1994 Northridge earthquake did many California engineers recognize that steel-frame structures can and do experience severe earthquake damage. The performance capability of early steel-frame buildings with infill masonry walls, however, remains unclear, despite improved understanding of their structural response characteristics.

scholarly journals Experimental Evaluation of Shear Behavior of Stone Masonry Wall

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2313
Author(s):  
Maria Luisa Beconcini ◽  
Pietro Croce ◽  
Paolo Formichi ◽  
Filippo Landi ◽  
Benedetta Puccini
Keyword(s):  
Shear Behavior ◽  
Stone Masonry ◽  
Masonry Walls ◽  
Mechanical Parameters ◽  
In Situ Tests ◽  
Capacity Curves ◽  
Historical Structures ◽  
Definition Of

The evaluation of the shear behavior of masonry walls is a first fundamental step for the assessment of existing masonry structures in seismic zones. However, due to the complexity of modelling experimental behavior and the wide variety of masonry types characterizing historical structures, the definition of masonry’s mechanical behavior is still a critical issue. Since the possibility to perform in situ tests is very limited and often conflicting with the needs of preservation, the characterization of shear masonry behavior is generally based on reference values of mechanical properties provided in modern structural codes for recurrent masonry categories. In the paper, a combined test procedure for the experimental characterization of masonry mechanical parameters and the assessment of the shear behavior of masonry walls is presented together with the experimental results obtained on three stone masonry walls. The procedure consists of a combination of three different in situ tests to be performed on the investigated wall. First, a single flat jack test is executed to derive the normal compressive stress acting on the wall. Then a double flat jack test is carried out to estimate the elastic modulus. Finally, the proposed shear test is performed to derive the capacity curve and to estimate the shear modulus and the shear strength. The first results obtained in the experimental campaign carried out by the authors confirm the capability of the proposed methodology to assess the masonry mechanical parameters, reducing the uncertainty affecting the definition of capacity curves of walls and consequently the evaluation of seismic vulnerability of the investigated buildings.

Resistance of Reinforced Concrete Frames with Masonry Infill Walls to In-Plane Vertical Loading

2016 ◽  
Vol 711 ◽  
pp. 982-988
Author(s):  
Alex Brodsky ◽  
David Z. Yankelevsky
Keyword(s):  
Reinforced Concrete ◽  
Failure Modes ◽  
Progressive Collapse ◽  
Lateral Loading ◽  
Masonry Walls ◽  
Reinforced Concrete Frame ◽  
Masonry Infill ◽  
Concrete Frame ◽  
Vertical Loading ◽  
Infill Masonry

Numerous studies have been conducted on the in plane behavior of masonry infill walls to lateral loading simulating earthquake action on buildings. The present study is focused on a problem that has almost not been studied regarding the vertical (opposed to lateral) in-plane action on these walls. This may be of concern when a supporting column of a multi-storey reinforced concrete frame with infill masonry walls undergoes a severe damage due to an extreme loading such as a strong earthquake, car impact or military or terror action in proximity to the column. The loss of the supporting column may cause a fully or partly progressive collapse to a bare reinforced concrete frame, without infill masonry walls. The presence of the infill masonry walls may restrain the process and prevent the development of a progressive collapse. The aim of the present study is to test the in-plane composite action of Reinforced Concrete (RC) frames with infill masonry walls under vertical loading through laboratory experiments and evaluate the contributions of infill masonry walls, in an attempt to examine the infill masonry wall added resistance to the bare frame under these circumstances. Preliminary results of laboratory tests that have been conducted on reinforced concrete infilled frames without a support at their end, under monotonic vertical loading along that column axis will be presented. The observed damages and failure modes under vertical loading are clearly different from the already known failure modes observed in the case of lateral loading.

scholarly journals Outcomes of In Situ Repair for Treatment of Arteriovenous Fistula Aneurysm

2021 ◽  
Vol 74 (3) ◽  
pp. e201-e202
Author(s):  
Hunter M. Ray ◽  
Yuki Ikeno ◽  
Jacob Siahaan ◽  
Kristofer Charlton-Ouw
Keyword(s):  
Arteriovenous Fistula ◽  
In Situ Repair

Fast in-situ repair technology-a novel SPS process for the waste refractory W–10Ti targets

Vacuum ◽  
2021 ◽  
pp. 110406
Author(s):  
Lei Huang ◽  
Yafei Pan ◽  
Jiuxing Zhang ◽  
Yong Du ◽  
Yuhui Zhang ◽  
...  
Keyword(s):  
Repair Technology ◽  
In Situ Repair

In-situ Repair of Marine Coatings by a Fe3O4 Nanoparticle-Modified Epoxy Resin under Seawater

2021 ◽  
pp. 132827
Author(s):  
Zhenliang Feng ◽  
Rongjian Wan ◽  
Shiming Chen ◽  
Xiao Tang ◽  
Hong Ju ◽  
...  
Keyword(s):  
Epoxy Resin ◽  
Fe3o4 Nanoparticle ◽  
Marine Coatings ◽  
Modified Epoxy ◽  
In Situ Repair

Bond of Steel Bars to Masonry Mortar Joints: Test Results and Analytical Modelling

2017 ◽  
Vol 747 ◽  
pp. 319-325 ◽  
Author(s):  
Matteo Maragna ◽  
Cristina Gentilini ◽  
Giovanni Castellazzi ◽  
Christian Carloni
Keyword(s):  
High Strength ◽  
Experimental Tests ◽  
Analytical Investigation ◽  
Masonry Walls ◽  
Test Results ◽  
Bond Slip ◽  
Pull Out ◽  
Steel Bars ◽  
Masonry Mortar

In this paper, the preliminary results of a series of pull-out tests conducted on mortar cylinders with embedded bars are presented. The bars are made of high strength stainless steel and are of helical shape to increase mechanical interlocking with the surrounding mortar. Usually, such bars are employed in situ to realize structural repointing in the case of fair-faced masonry walls. To this aim, they are inserted in the mortar bed joints of masonry for providing tensile strength to the walls and with the function of crack stitching. The aim of the present experimental tests is to determine the bond-slip relationship for bars embedded in masonry. Firstly, pull-out tests are conducted on mortar cylinders considering different embedded lengths of the bars. Further tests are on-going on masonry specimens with bars embedded in the mortar joints. An analytical investigation is also carried out for the interpretation of the pull-out test results.

scholarly journals Successful In Situ Repair for Mycotic Aneurysm of the Iliac Artery with Autologous Superficial Femoral Vein.

2003 ◽  
Vol 32 (2) ◽  
pp. 112-115
Author(s):  
Masato Yoshida ◽  
Tsutomu Shida ◽  
Nobuhiko Mukohara ◽  
Hidefumi Obo ◽  
Nobuhiro Tanimura ◽  
...  
Keyword(s):  
Iliac Artery ◽  
Mycotic Aneurysm ◽  
Femoral Vein ◽  
Superficial Femoral Vein ◽  
In Situ Repair
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