scholarly journals Retrofitting of Infilled Frame in Reinforced Concrete Structure

2020 ◽  
Vol 39 (3) ◽  
pp. 475-488
Author(s):  
Wajid Ali ◽  
Syed Azmat Ali Shah ◽  
Khan Shahzada ◽  
Syed Muhammad Ali ◽  
Sajjad Wali Khan
Keyword(s):  
Seismic Performance ◽  
Research Work ◽  
Reinforced Concrete Structure ◽  
Infill Wall ◽  
Response Modification Factor ◽  
Infilled Frames ◽  
Static Test ◽  
Infilled Frame ◽  
Door Opening ◽  
Original Strength

This research work aims to compare the seismic performance (in terms of lateral load strength, stiffness, ductility, response modification factor and performance levels) of full scale infilled frames before and after retrofitting. To evaluate the seismic performance, two infilled frames with door opening at different locations were constructed in the laboratory based on the current construction practices in Pakistan. In one infilled frame, door opening was at the center (Frame-1) while in other, door opening was at a side (Frame-2). After construction, both the specimens were tested with quasi-static test. The damaged parent specimens were then retrofitted with Ferrocement overlay and cracks in the infill wall were repaired with grout injection. Steel door frames of gauge 18 were installed at the door opening to make the model more realistic. Results obtained after performing quasi static test on the retrofitted specimen have showed that the specimens not only gained the original strength, but the seismic parameters of the infilled frames were observed to have also improved.

scholarly journals Analysis of the Effect of the Solid-Brick Infilled Frames on the Behavior of A Hybrid System of Moment Resistance Frame, Shear Wall, and Infilled Frame Along High Concrete Structures

2015 ◽  
Vol 10 (Special-Issue1) ◽  
pp. 789-795
Author(s):  
Mehdi Shekarbeigi ◽  
Hooshang Shekarbeigi
Keyword(s):  
Hybrid System ◽  
Software Package ◽  
Concrete Structures ◽  
Shear Wall ◽  
Structural System ◽  
System Behavior ◽  
Base Shear ◽  
Infilled Frames ◽  
Infilled Frame ◽  
The Moment

This paper is to investigate the benefits of a new structural system (hereafter it is referred as “Ultra Hybrid System”) in high concrete buildings relying on the compound performance of the moment resistance frame, shear wall and infilled frame. In this case, the Ultra Hybrid System takes the advantage of the moment resistance frame and shear wall up to the height, where the wall performance reaches zero, while it is applied the infilled frame along with it. It is studied the system behavior based on using concrete-brick infilled frames in the upper floors to find out the interaction between the shear wall and infilled frame. Then, it is compared displacement, relative floor displacement, base shear, axial column loads in a hybrid system of the moment resistance frame and shear wall and the Ultra Hybrid System of the moment resistance frame, shear wall, and infilled frame. In this study, ETABS 2000 software package )Barkhordari et al., 2001) is used to model the system in compression diagonal mode. Finally, the results are presented in diagrams and tables.

Test and Numerical Study on the Seismic Performance of A Cable Restrainer for Girder Bridges

2019 ◽  
Author(s):  
Yitong Gu ◽  
Wancheng Yuan ◽  
Xinzhi Dang
Keyword(s):  
Seismic Performance ◽  
Numerical Study ◽  
Design Method ◽  
Lateral Displacement ◽  
Static Test ◽  
Girder Bridges ◽  
Continuous Girder Bridge ◽  
Service Conditions ◽  
Girder Bridge ◽  
Parametric Analyses

<p>In China, most of the support systems applied by short/medium span bridges are elastomeric pad bearings (EPBs). This type of support system has no reliable connections between bearings and girders as well as bearings and piers, which will cause structural damages due to large lateral displacement of bearings under earthquakes. The restrainers used currently could restrict the deformation of bridges under normal service conditions and could only restrict unidirectional displacement. Considering the disadvantages of these restrainers, a new restrainer called Connected Cable Restrainer (CCR), which can be used in short/medium span bridges supported by EPBs, is developed in this paper. The design principle, basic configuration, isolation mechanism and the design method of CCR are introduced. A pseudo static test to study the seismic performance of CCR is conducted. Seismic responses of a 3-span continuous girder bridge with CCR are simulated using OpenSees platform and parametric analyses of the two main parameters, lateral restraining displacement and restraining stiffness, are also carried out. Results show that the deformation of bridges under normal service conditions would not be restrained using CCR and the displacement responses can be mitigated effectively by using CCR through parameter optimization.</p>

Seismic Performance of a Mixed Masonry-Reinforced Concrete Building

2015 ◽  
pp. 293-312 ◽  
Author(s):  
Vincenzo Gattulli ◽  
Francesco Potenza ◽  
Filippo Valvona
Keyword(s):  
Reinforced Concrete ◽  
Seismic Performance ◽  
Discrete Models ◽  
Reinforced Concrete Structure ◽  
Reinforced Concrete Building ◽  
Seismic Performance Evaluation ◽  
Current Limit ◽  
Concrete Building ◽  
Nonlinear Static Procedure ◽  
The City

The 6th of April 2009, a quite strong earthquake of magnitude ML =5.8 (Mw=6.3), struck in the city of L'Aquila. The seismic event caused serious injure to several masonry buildings, compromising a large part of the valuable historical and architectural heritage. The present work deals with seismic performance evaluation of an existing mixed masonry-reinforced concrete building in downtown L'Aquila city. A comprehensive discussion on the current limit capacity of the building based on the visual inspections of the occurred seismic damage, the experimental data from a wide campaign of on-site tests on the material properties, the results of numerical simulations from different naturally discrete models of the mixed masonry-reinforced concrete structure are presented. The seismic performance is evaluated through well-recognized N2 nonlinear static procedure. The Frame by Macro-Elements method is used to define an equivalent 3D frame representation of the structure. The obtained numerical results are directly compared with the surveyed damages.

scholarly journals Seismic Response Analysis of Pier considering Durability Damage Repair

2020 ◽  
Vol 2020 ◽  
pp. 1-16
Author(s):  
Yan Liang ◽  
Liangliang Li ◽  
Ruimin Mao ◽  
Xiaoye Shi
Keyword(s):  
Seismic Performance ◽  
Steel Corrosion ◽  
Element Model ◽  
Response Analysis ◽  
Reinforced Concrete Structure ◽  
Analysis Model ◽  
Bond Slip ◽  
Damage Repair ◽  
Bridge Structures ◽  
Material Durability

At present, most of the research studies on the seismic performance of the durability degraded reinforced concrete structure only consider the influence of a single factor. This paper comprehensively considers the factors such as concrete carbonization, steel corrosion, and bond slip performance degradation caused by other durability factors and durability damage repair and studies the influence of the above factors on the seismic performance of bridge structures. Based on the finite element model considering the bond slip and the material parameters of time-varying durability damage, the seismic performance analysis model of the pier is established considering material durability damage repair in different service periods. Then, the effect of material durability damage repair on the seismic performance of the pier is examined. The results show that the displacement of the pier top increases, the curvature of the pier bottom decreases, and the moment-curvature curve pinching phenomenon is further evident when considering the bond slip. When considering the durability damage repair of materials, the curvature considerably decreases (the maximum value is approximately 16.04%) with the extension of the service time of the bridge, and the pier damage is substantially reduced.

scholarly journals Effects of Single and Multi Openings in Brick Infills on the Seismic Response of Infilled RC Frames

2018 ◽  
Vol 215 ◽  
pp. 01036
Author(s):  
Maidiawati ◽  
Jafril Tanjung ◽  
Hamdeni Medriosa ◽  
Yulia Hayati
Keyword(s):  
Seismic Response ◽  
Dissipated Energy ◽  
Rc Frame ◽  
Infilled Frames ◽  
Masonry Infill ◽  
Infilled Frame ◽  
Rc Frames ◽  
Central Opening ◽  
Lateral Strength ◽  
Infilled Rc Frames

Many researchers have performed a lot of studies of the seismic behavior reinforced concrete (RC) frame with masonry infill. They found that masonry infill affects the lateral strength, stiffness and ductility performance of the RC frame structures. However, when openings appeared in the panel infill for door and windows, the responses of the overall structure are entirely changed. The primary purpose of this study is to experimentally investigate the behavior of brick infilled RC frames possessing single opening and two openings. Four specimens of 1/4-scale single bay RC frames with brick infills were made that were one bare frame, one frame with full infill and two frames with infills having a central opening and two openings with the opening ratio of 25%. The specimens were tested under lateral reversed cyclic loads. Consequently, different responses of failure mechanism, lateral strength, stiffness and energy dissipated were observed among the specimens. The brick full infill failed in shear with propagation cracks in central part of the panel, but in the case of the infills with single and two openings, the cracks were dominated at the corners of the openings. The in-plane strength, stiffness and dissipated energy of infilled frames decreased when openings appeared in the panel. However, the seismic performance of brick infilled frame with the opening of 25% of panel area is better than those of bare frame. The brick infilled frames with a central opening and two openings are similar in lateral strength and dissipated energy. It seems that area and position of the openings control the seismic response to the overall infilled frame structure of the openings

INTERFACIAL AND TENSILE PROPERTIES OF HYBRID FRP COMPOSITES USING DNN STRUCTURE WITH OPTIMIZATION MODEL

2019 ◽  
Vol 27 (02) ◽  
pp. 1950099 ◽  
Author(s):  
AHMED ABDUL BASEER ◽  
D. V. RAVI SHANKAR ◽  
M. MANZOOR HUSSAIN
Keyword(s):  
Tensile Properties ◽  
Natural Fiber ◽  
Hybrid Composites ◽  
Research Work ◽  
Composite Plates ◽  
High Strength ◽  
Fiber Reinforced ◽  
Reinforced Concrete Structure ◽  
Shear Strengthening ◽  
Frp Composites

Fiber reinforced polymer (FRP) composites are appealing for use in structural building applications because of their high strength-to-weight and stiffness-to-weight proportions, corrosion resistance, lightweight, possibly high durability, along with free design characteristics. The aim of this research work was to develop high strength natural fiber-based composite plates for the possible application in the shear strengthening of the reinforced concrete structure. In the experimental modeling, the composites were fabricated using glass, flax and kenaf fibers in treated and untreated conditions. This paper studied and analyzed the interfacial and tensile properties of fiber reinforced hybrid composites such as flax/glass and kenaf/glass by using the simulation approach, i.e. Deep Neural Network (DNN) with weight optimization. For optimizing the weights in DNN, Oppositional based FireFly Optimization (OFFO) is proposed. All the optimal results exhibit in the way that the accomplished error values between the output of the experimental values and the predicted qualities are firmly equivalent to zero in the designed system.

The Innovation and Development about Spatial Form of Traditional Cave Dwellings in the Northwest

2014 ◽  
Vol 1008-1009 ◽  
pp. 1316-1319 ◽  
Author(s):  
Guo Rong Wang
Keyword(s):  
Seismic Performance ◽  
Research Work ◽  
Spatial Form ◽  
Interior Space ◽  
Existing Problems ◽  
Building Technology ◽  
Modern Building ◽  
Innovation And Development

Through the northwestern cave homes’ distribution and some research work, the article analyzes its spatial form and existing problems. And combined with the modern building technology, in view of the traditional cave dwelling interior space drab, tightness in the dark wet and poor seismic performance shortcomings,the article, mainly from the perspective of spatial form of traditional cave dwelling potential ecological advantages, puts forward such problems as the innovation and development of cave dwelling space reference.

Out-of-plane seismic performance of plasterboard partition walls via quasi-static tests

2016 ◽  
Vol 49 (1) ◽  
pp. 125-137 ◽  
Author(s):  
Crescenzo Petrone ◽  
Gennaro Magliulo ◽  
Pauline Lopez ◽  
Gaetano Manfredi
Keyword(s):  
Seismic Performance ◽  
Bending Moment ◽  
Structural Elements ◽  
Nonstructural Components ◽  
Static Tests ◽  
Static Test ◽  
Cyclic Behaviour ◽  
Testing Protocol ◽  
Partition Walls ◽  
Out Of Plane

Internal partitions, as many nonstructural components, should be subjected to a careful and rational seismic design, as is done for structural elements. A quasi-static test campaign aimed at the evaluation of the out-of-plane seismic performance of Siniat plasterboard internal partitions with steel studs was conducted according to FEMA 461 testing protocol. Four tall, i.e. 5 m high, specimens were selected from the range of internal partitions developed in Europe by Siniat, a leading supplier of plasterboard components in Europe. Under the specified testing protocol, a significant nonlinear pinched behaviour of the tested specimen was observed. The pinched behaviour was caused by the damage in the screwed connections, whose cyclic behaviour was strongly degrading. Both stiffness and strength of the specimens are significantly influenced by the board typology and the amount of screwed connections. Finally, it was concluded that Eurocodes significantly underestimate the resisting bending moment of the tested specimens.

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