What is the difference between force based and displacement based seismic analysis?
It should be noted that the initial stiffness and ductility in force-based design were deliberately chosen to be similar to the displacement-based values. Perhaps the process of determining the initial stiffness and the ductility are the biggest differences between the two methods.
What is direct displacement based design?
This chapter presents the fundamentals of the new seismic design method known as direct displacement based design. It is a simple design approach where the multi-degree-of-freedom structure is characterized the secant stiffness and equivalent elastic damping of an equivalent single-degree-of-freedom structure.
What is direct design in earthquake engineering?
The direct design approach (Figure 6-5) to be used for the structural protective measures is to first design the building for conventional loads, then evaluate the structure’s response to explosive loads and augment the design, if needed.
What is capacity based design?
Capacity Design is a design process in which it is decided which objects within a structural system will be permitted to yield (ductile components) and which objects will remain elastic (brittle components).
What is indirect displacement?
Indirect displacement refers to changes in who is moving into the neighborhood as low-income. residents move out. While there is often a lot of movement in and out of rental housing in low- income neighborhoods, indirect displacement occurs when units being vacated by low-income.
What is the capacity of earthquake?
A measure of earthquake motion capacity to damage medium-period structures* The expression I=vgtD0.25 is proposed as an instrumental measure of earthquake ground motion capacity to damage structures with fundamental periods in the medium-period (velocity-controlled) region.
What is a performance based solution?
A Performance Solution provides a tailored solution to meet the intended objective of the Performance Requirements. A Performance Solution must comply with all relevant Performance Requirements and must be verified using one or a combination of the following Assessment Methods: Evidence of suitability.
What is pushover analysis?
Pushover analysis is a static procedure that uses a simplified nonlinear technique to estimate seismic structural deformations. Structures redesign themselves during earthquakes. As individual components of a structure yield or fail, the dynamic forces on the building are shifted to other components.
What is Process and capacity design?
Capacity planning is the process of determining the production capacity needed by an organization to meet changing demands for its products. In the context of capacity planning, design capacity is the maximum amount of work that an organization is capable of completing in a given period.
What is capacity design in seismic?
Capacity design is a part of a seismic check and ensures that the joint has sufficient deformation capacity. The objective of capacity design is to confirm a building undergoes controlled ductile behavior in order to avoid collapse in a design-level earthquake.
What is the difference between gentrification and displacement?
Gentrification (which refers to how a place is changing) and displacement (which is something that happens to individual people or communities in that place) are two such concepts that often get used in the same breath or even as synonyms, but shouldn’t.
What is disaster capacity?
PW Disaster risk Capacity refers to all the strengths, attributes and resources available within a community, organization or society to manage and reduce disaster risks and strengthen resilience.
What is a DTS or performance solution?
A DTS solution follows a set recipe of what, when and how to do something. In this case – swimming pool barriers. It uses the DTS solutions from the BCA, which include materials, components, design factors, and construction methods that, if used, are deemed to meet the performance requirements.
What is the target displacement?
Under seismic loads on structures, the maximum drift without total collapse is called target displacement.
What is nonlinear analysis?
A nonlinear analysis is an analysis where a nonlinear relation holds between applied forces and displacements. Nonlinear effects can originate from geometrical nonlinearity’s (i.e. large deformations), material nonlinearity’s (i.e. elasto-plastic material), and contact.
What is the difference between design capacity and system capacity?
System capacity is less than design capacity or at the most equal it because of the limitation of product mix, quality specification, and breakdowns. The actual is even less because of many factors affecting the output such as actual demand, downtime due to machine/equipment failure, unauthorized absenteeism.
What is urban displacement?
People displaced by conflict, natural hazards, or some combination of the two often move to urban centres.
What is displacement gentrification?
While increased investment in an area can be positive, gentrification is often associated with displacement which means that in some of these communities, long-term residents are not able to stay to benefit from new investments in housing, healthy food access, or transit infrastructure.
What should I know about displacement?
Know that displacement is measured using a straight line, not a curved path. To find displacement, you will need to find the shortest, most efficient way of measuring the difference between two points. A curved path will lead you from your initial location to your final location, but it is not the shortest path.
What is direct-displacement based design (ddbd)?
Direct-displacement based design (DDBD) approach is a significant development in structural fields to outdo the deficits of force-based design (FBD) for reinforced concrete (RC) frame buildings. In the current study, the inelastic behaviour of buildings designed by FBD and DDBD are investigated with numerical research.
What is the difference between time-history analysis and displacement based design?
It is shown that the difference in characteristic stiffness between time-history analysis (i.e. the initial stiffness) and displacement based design (the secant stiffness to maximum response) requires a modification to the elastic viscous damping added to the hysteretic damping in Direct Displacement-Based Design.
What are the challenges of displacement based seismic design?
One of the challenges in the displacement-based seismic design procedure is to estimate the inelastic displacement demands of structures during earthquake ground shaking. Having a predominant pulse is the main feature for pulse-like ground motions differing from others.