Base shear understand
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Base shear, or the horizontal force at the base of a building during an earthquake, depends on three main factors: (1) the weight of the building, with heavier buildings experiencing higher base shears; (2) the stiffness of the building, with stiffer buildings experiencing higher base shears than more flexible buildings; and (3) the distance from an earthquake fault, with buildings closer to faults experiencing more violent shaking and higher base shears. The ability of a structure to dissipate energy through ductility is also important for earthquake resistance beyond just resisting forces.
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shear wall design and analysis kjhsjABCJBCSHJBCHJHHHSKAOAKJJDEUJDJMMNSKWHEHEEEEEEEEEEEEEEEEEEEEELJCKSNMSMNCABHJCBILHFWLIUHFLKJSANCASKBCLIUHFWEIUFYJLQIH.UCYW9QUFHJSCNAMBCBJHSDGHDWGFLAKJBJKAHCIUPDWEHFOHKANC,MAHFOSAHFKJSNZVKJDHVOIADHFOJCSKHFOEYVKJBCZVSDBUIGAKJDVBZKJDFUIDSHFVKJBVDJSHOSIUHGOIShIASGVKJSCBVKSDHGIUEWHVKJDBVKJSDGIUSDHJKXZBVKJDFISUDHVKJNXVKJXZHOAIHOFIHDIJVBLZKxHCISDUHFISDJBKJSDHFISUDFYIUFFFFFFFFFFFFFIHZXIUHVIUZXVHKJDHV,VCXCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCBBBBBBBBBBBBBBBBBBBBFSBSBSFHSFFFFFFFFFFFFFFHHHHHHH SDKJDHUSDKVAGOYDSGKVSDGFIYWGLF7YTWOIDULFGDSHGFLIDUFQILDUTFYLIUGAIWUEGFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJ
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• 1- to form a plastic hinge and wall work in the plastic area
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Base isolation is a seismic protection system that places flexible bearings between a structure and its foundation. During an earthquake, the bearings allow the structure to move independently from the shaking ground, isolating it from seismic forces. Common base isolation bearings include elastomeric bearings and lead-rubber bearings, which are stiff vertically but flexible horizontally. Base isolation is effective because it lengthens a structure's period of vibration, reducing the accelerations and forces experienced, and protects both the structure and its contents from earthquake damage.
Earthquake resistant structure By Engr. Ghulam Yasin Taunsvi
The resistance structure is structures designed to withstand earthquakes. While no structure can be entirely immune to damage from earthquakes, the goal of earthquake-resistant construction is to erect structures that fare better during seismic activity than their conventional counterparts.
Introduction To Structures.docx
This document contains questions and answers related to structural design principles. It discusses key concepts like robustness, strength, serviceability, stability, material properties, structural analysis, different load types, limit state design, and structural systems. Questions cover topics such as structural principles, material properties, stress-strain behavior, load considerations, deflection calculations, tributary areas, concrete beam design, reinforced and prestressed concrete, vibration causes and solutions, soil properties, retaining walls, ground improvement techniques, and foundation systems.
Introduction To Structures.docx
This summary provides an overview of the key structural concepts covered in the document:
1. The document discusses various structural principles including robustness, strength, serviceability, and stability and provides examples for each. It also defines material properties like ultimate stress and hardness.
2. Load types such as permanent loads, live loads, and wind loads are described along with considerations for determining their magnitude.
3. Limit state design and the two-layered factor of safety approach are explained. Limit state design uses modern methods to determine structural capacity and loading.
4. Stability systems like braced frames are discussed as ways to provide stability to structures subjected to lateral loads. The GLAD workflow for structural design is
Earthquake and earthquake resistant design
This document discusses various earthquake-resistant features used in building design including:
1) Using beams as ductile weak links rather than columns through strong-column weak-beam design.
2) Improving masonry wall behavior by controlling wall dimensions and heights, ensuring proper construction and bonding, and adding horizontal reinforcement.
3) Using shear walls in reinforced concrete buildings to provide strength and stiffness throughout the building height.
Seismic Retrofitting and repairs and rehabilitations
Seismic retrofitting is the modification of existing structures to make them more resistant to seismic activity, ground motion or soil failure due to earthquakes.
There are several techniques which have come forward nowadays by which an existing structures can be modified and make it less prone to earthquakes.
There is no such technique to make the structure fully earthquake proof but seismic performance can be greatly enhanced through proper initial design or subsequent modifications.
Presentation on earthquake resistance massonary structure
This presentation discusses how to make masonry structures more resistant to earthquakes. It defines earthquake resistant masonry structures as those built from brick, stone or other masonry materials combined with containment reinforcement. It describes stresses in masonry walls during quakes and modeling of walls, then discusses techniques to strengthen buildings like adding flexibility, reinforcing walls and foundations, and containment reinforcement around walls. Shock table testing was also used to evaluate different earthquake resistant building features in masonry models.
HRDB
This document discusses base isolation as a method for seismic protection of structures. It explains that base isolation works by increasing the natural period of the structure and decreasing its acceleration, while allowing for increased displacement at the isolated base. This reduces seismic demand on the superstructure. The document provides details on the design process for base isolation using either an equivalent lateral force method or dynamic analysis, and highlights important performance objectives for seismic isolation systems. It also gives some examples of early base isolation retrofit projects in the United States.
Earthquake resistant building construction
1 INTRODUCTION
2 EARTHQUAKE THEORY
3 EARTHQUAKE MAGNITUDE AND ENERGY
4 EFFECTS OF EARTHQUAKES
5 MAJOR EARTHQUAKES
6 NOTABLE EARTHQUAKES AND THEIR ESTIMATED
MAGNITUDE
7 HOW EARTHQUAKE RESISTANT CONSTRUCTION IS
DIFFERENT
8 SEISMIC DESIGN PHILOSOPHY
9 EFFECT OF EARTHQUAKE ON REINFORCED CONCRETE BUILDINGS
10 ROLES OF FLOOR AND MASONRY WALLS SLABS
11 STRENGTH HIERARCHY
12 EARTHQUAKE RESISTANT BUILDING
13 EARTHQUAKE DESIGN PHILOSOPHY
14 REMEDIAL MEASURES TO MINIMISE THE LOSSES DUE TO EARTHQUAKES
15 EARTHQUAKE RESISTANT BUILDING CONSTRUCTION WITH REINFORCED HOLLOW CONCRETE BLOCK(RHCBM)
16 STRUCTURAL FEATURES
17 STRUCTURAL ADVANTAGES
18 CONSTRUCTIONAL ADVANTAGES
19 ARCHITECTURAL AND OTHER ADVANTAGES
20 STUDIES ON THE COMPARATIVE COST ECONOMICS OF RHCBM
21 MID-LEVEL ISOLATION 32-34
22 EARTHQUAKE RESISTANCE BUILDING USING SEISMIC ISOLATION SYSTEMS WITH SLIDING ON CONCAVE SURFACE
23 DESCRIPTION
24 CONCEPT OF FRICTION PENDULUM BEARING
25 SLIDING PENDULUM SEISMIC ISOLATION SYSTEM
26 BACKGROUND OF THE INVENTION
27 BRIEF SUMMARY OF THE INVENTION
28 DETAILED DESCRIPTION OF THE INVENTION
29 ESTIMATION
30 CONCLUSION
31 BIBLIOGRAPHY
earthquakeresistantbuildingconstruction-150526104359-lva1-app6892.pdf
The document discusses earthquakes and earthquake-resistant construction. It begins by defining earthquakes and describing earthquake measurement. It then discusses earthquake effects like shaking, landslides, fires, and tsunamis. Different earthquake magnitudes are provided along with associated energy levels and examples. Construction techniques for earthquake resistance are covered, including reinforced hollow concrete blocks, base isolation systems, and friction pendulum bearings. Project cost estimates are also included.
Investigating the Effect of Pounding on Seismic Response of Isolated Structures
This document summarizes an investigation into the effect of pounding on the seismic response of isolated structures. The study used numerical modeling to analyze the response of a 4-story isolated building with and without pounding. The results showed that pounding can significantly increase floor accelerations, inter-story displacements, and shear forces compared to an isolated building without pounding. Parameters like isolation system stiffness, superstructure stiffness, damping, and the use of impact buffers were also examined. The key finding was that pounding can reduce the effectiveness of seismic isolation in protecting structures and needs to be considered in design.
Earthquake and effect in building types precaution
The document discusses earthquake resistant buildings. It begins by explaining the causes of earthquakes and how seismic waves travel and are measured. It then discusses plate tectonics theory and the different types of faults that cause earthquakes. The key aspects for earthquake resistant design are discussed - allowing structures to deform without collapsing through ductility and following seismic building codes. Masonry structures need horizontal bands and vertical reinforcement to perform well during quakes. Diaphragms and shear walls are the main lateral load resisting systems to transfer seismic forces safely to the ground.
Blast resistance building
Now a days very less research is going on for this topic. I have tried to design G+1 building using STAAD Pro as per IS Code 4991-1968.
Analysis and Capacity Based Earthquake Resistance Design of Multy Bay Multy S...
This document summarizes the analysis and capacity based earthquake resistant design of a multi-bay, multi-story residential building. A nonlinear static pushover analysis was performed on the building model in ETABS2015 to estimate the structure's ultimate capacity and failure mechanisms. The analysis found plastic hinge formation and indicated damage levels at different load steps. Capacity curves and capacity spectrum curves were generated from the pushover analysis in both horizontal directions. Story displacements from the pushover analysis and response spectrum analysis are also reported. The results provide estimates of the building's strength, deformation capacities, and expected performance under seismic loads.
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Task 1 Structural Design Principles Question For.pdf
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Base isolation topic as per jntu syllabus for m.tech 1st year structures
Base isolation topic as per jntu syllabus for m.tech 1st year structures
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Earthquake resistant structure By Engr. Ghulam Yasin Taunsvi
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Investigating the Effect of Pounding on Seismic Response of Isolated Structures
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Base shear understand
- 1. Base shear should be more or less than what? Let us try tounderstand structural dynamics using some static approaches. Building is heavy -> High Base Shear Building is stiff -> High Base Shear Building located near fault -> High Base Shear 1. Building Weight Imagine you have two buildings. One weights 50,000 kips while the other weights 20,000 kips. And let us say that the ground is excited at 0.4g of acceleration. Now in no way the entire building will be shaked at this value of acceleration, but just for the sake of simplifying we say that it is. So building 1 will have a base shear of 50,000 * 0.4 = 20,000 kips Building 2 will have a base shear of 20,000*0.4 = 8,000 kips So there you have variation of building base shear with respect to weight of the structure. 2. Building Stiffness Oh, this one is the ultimate parameter tounderstand the building base shear. Now, each structure has its own natural period of vibration. Some buildings have 0.5 seconds, some have 1.5 seconds and some have 8 seconds of natural period. Higher the natural period of structure means the more flexible the structure is. A flexible structure generally experiences lower accelerations than a stiff building. This is called response of a structure. (Response Spectrum Analysis). Now because a flexible building is hard to excite, it will have lower base shear as compared to a stiff building. For example if you compare a shear wall building and a moment frame building for the same building height and weight, then the base shear of moment frame building will be lower than that of a shear wall building. 3. Distance from Fault This is kind of understood. Where would you experience more violent shaking? Near fault or away from fault? The amount of ground excitation plays an important role in determining the base shear. In a site specific response spectrum, the acceleration at ground is the value of acceleration at zero time period in the chart. The most important part in designing the building to resist earthquakes is not just capacity of structure to resist force. But the ability of structure tobe ductile enough to dissipate energy. The ductility of the structure lies in capacity based design. If a
- 2. structure is well detailed, then it has more chances of surviving earthquakes than a poorly detailed one.