# What is meant by determinate structure?

## What is meant by determinate structure?

[də′tər·mə·nət ′strək·chər] (mechanics) A structure in which the equations of statics alone are sufficient to determine the stresses and reactions.

### How do you determine if a frame is statically determinate or indeterminate?

A structure is statically indeterminate if the member forces cannot be calculated using the equations of static equilibrium. Example 1. Since the number of unknowns = the number of equations, the structure is statically determinate (member forces can be calculated using equilibrium equations). structure is stable.

#### How do you know if a structure is determinate?

If the number of equations = the number of unknowns, then the structure is statically determinate. If, on the other hand, number of equations < the number of unknowns, the structure is statically indeterminate, and hence, other methods need to be used to analyze it.

What is determinate structure with example?

Example of determinate structures are : simply supported beams, cantilever beams, single and double overhanging beams, three hinged arches, etc. Redundant or indeterminate structures are not capable of being analysed by mere use of basic equilibrium equations.

What is kinematically determinate structure?

A kinematically determinate structure can be defined as a structure where, if it is possible to find nodal displacements compatible with member extensions, those nodal displacements are unique.

## What is statically determinate problems?

A statically determinate structure is the one in which reactions and internal forces can be determined solely from free-body diagrams and equations of equilibrium.

### Which is statically determinate beam?

In regards to beams, if the reaction forces can be calculated using equilibrium equations alone, they are statically determinate. On the other hand, if the reaction force can’t be determined using equilibrium equations only, other methods have to be used, and the structure is said to be statically indeterminate.

#### What is the difference between determinate and indeterminate structures?

Determinate structures are analysed just by the use of basic equilibrium equations. By this analysis, the unknown reactions are found for the further determination of stresses. Redundant or indeterminate structures are not capable of being analysed by mere use of basic equilibrium equations.

What are the different types of statically determinate structures?

Which beam is kinematically determinate?

fixed beam
A fixed beam is kinematically determinate and a simply supported beam is kinematically indeterminate. (i) Each joint of plane pin jointed frame has 2 degree of freedom.

## Which is the best way to analyze a determinate frame?

The general steps for analysing a determinate frame are: Use equilibrium to find all reaction forces. Split the frame into separate members. Any point load or moment which acts directly on a joint between two or more members must be placed on only ONE of the members when they are split up.

### Which is the determinate version of a structure?

Original Structure minus 1 force” is therefore the stable and determinate version of this structure. Therefore the original structure is indeterminate with one redundant. CE 331, Fall 2009 Stability & Determinacy of Beams & Frames 5 / 5 Advantages of Indeterminate Structures Indeterminate structures are often more structurally efficient.

#### What are the differences between determinate and indeterminate structures?

Determinate and Indeterminate Structures and Their DIfferences. Structure is generally classified into two categories as Determinate and Indeterminate Structures or Redundant Structures for analysis of structures to find forces based on criteria discussed below.

Why is the portal frame shown in Figure 4 statically determinate?

The portal frame shown in figure 4 are statically determinate because there are only three reactions to be determined. If a portal frame has more than three reactions it is statically indeterminate, the degree of indeterminacy or redundancy being equal to the number of redundant or extra reactions to be determined. 07/09/2019