Name: types of structural supports
Uploaded: 2023-09-22T11:49:22.000Z
Duration: 1 min 30 s
Channel: JoVE

역학에서 동일 평면상 힘 시스템은 접촉 지점과 지지대 사이에 다양한 유형의 반응을 경험합니다.
지지대는 동등하고 반대되는 힘을 가하여 시스템의 평행 이동 운동을 방지합니다. 또한 반대 방향으로 몇 순간을 적용하여 시스템의 회전을 방지합니다.
롤러 지지대를 사용하면 구조물이 한 방향으로만 평행 이동할 수 있습니다. 롤러 지지대에서의 반작용은 지지대에 수직으로 작용하는 단일 힘입니다.
핀 지지대는 빔의 회전만 허용하여 평행 이동 동작을 제한합니다. 그것은 핀의 축에 수직인 평면에 가해진 힘에 대한 반응을 일으킵니다. 이 힘은 직사각형 구성 요소로 분해 될 수 있습니다.
고정 지지대는 적용된 힘에 두 개의 반력과 모멘트를 제공하여 구조가 어떤 방향으로든 평행 이동 및 회전하는 것을 억제합니다. 힘 Fx 는 지지부의 축을 따라 수평 방향으로 작용하고 Fy 는 지지부에 수직으로 작용합니다.

<ol>
	<li>히벨러, R.C. (2016). Engineering Mechanics \u2012 정역학 및 동역학. 뉴저지 호보켄: 피어슨 프렌티스 홀. 쪽 209-211</li>
</ol>

지지반력

Support Reactions

공면력계는 모두 같은 평면에 놓여 있고 접점과 지지대 사이에 서로 다른 반응을 받는 힘의 집합을 말합니다. 다양한 유형의 지지대가 공면력에 미치는 영향을 이해하는 것은 외부 하중을 견딜 수 있는 안전하고 신뢰할 수 있는 구조물을 설계하는 데 매우 중요합니다.
지지대의 목적은 동일한 힘과 반대되는 힘을 가하여 시스템의 병진 운동을 방지하고 반대 방향으로 몇 개의 모멘트를 가하여 시스템의 회전을 방지하는 것입니다. 지지대는 용도와 용도에 따라 롤러 지지대, 핀 지지대, 고정 지지대의 세 가지 주요 유형이 있습니다.
롤러 지지대는 표면에 정상적인 단일 반력을 제공하여 한 방향으로만 이동이 가능합니다. 이 유형의 지지대는 온도 변화로 인해 팽창하거나 수축하는 다리와 같이 이동이 제한되어야 하는 곳에 자주 사용됩니다.
핀 지지대는 적용된 힘을 받으면 축에 수직인 평면에서 반력을 제공합니다. 이것은 회전은 허용하지만 병진 운동은 제한하므로 캔틸레버 또는 길이를 따라 균일한 하중 조건을 가진 구조물에 유용합니다.
마지막으로 고정식 지지대는 가해지는 힘에 두 개의 반력과 모멘트를 제공하여 병진과 회전을 모두 방지합니다. 이러한 유형의 지지대는 높은 수준의 안정성 요구 사항으로 인해 건물에서 자주 사용됩니다.

동일 평면상의 힘 시스템은 모두 같은 평면에 있고 접촉 지점과 ...

Education

교육

JoVE Core

Mechanical Engineering

기계공학

Unit 1

제1단원

Equilibrium of a Rigid Body

강체의 평형

KEY TERMS AND CONCEPTS

주요 용어 및 개념

types of structural supports

Types of structural supports control how a coplanar force system moves and reacts under load. A coplanar force system is a set of forces that all lie in the same plane. The supports create reactions at the point of contact. These reactions help keep a structure stable under external forces.

Supports work by stopping translation with an equal and opposite force. They can also stop rotation by applying a couple moment in the opposite direction. In structural design, these reactions are important for safe and reliable systems. They help structures resist loads without unwanted motion.

There are three main support types: roller support, pin support, and fixed support. A roller support allows translation in only one direction. It provides a single reaction force normal to its surface. This support is useful where movement must still happen in a controlled way, such as in bridges that expand or contract with temperature changes.

A pin support provides a reaction force in the plane perpendicular to its axis when force is applied. It permits rotation but restricts translational motion. This makes it useful for structures with cantilevers or with uniform loading conditions along their length. A fixed support prevents both translation and rotation. It provides two reaction forces and a moment, so it is often used in buildings where high stability is needed.

Types of Structural Supports

conditions of equilibrium

Rigid Body Force Balance in Equilibrium

Rigid body equilibrium depends on a balance of external forces and moments. A rigid body is in equilibrium when it has no translational motion and no rotational motion. This happens when the net force and the net couple acting on the body are both zero. Internal forces are not used when checking equilibrium. These forces act in equal and opposite pairs inside the body, so they cancel each other. Because of that, they do not affect the overall motion or change in motion of the rigid body. The...

support reactions

Types of structural supports control how a coplanar force system moves and reacts under load. A coplanar force system is a set of forces that all lie in the same plane. The supports create reactions at the point of contact. These reactions help keep a structure stable under external forces. Supports work by stopping translation with an equal and opposite force. They can also stop rotation by applying a couple moment in the opposite direction. In structural design, these reactions are important...

internal forces and center of gravity

Forces Inside a Body and Balance

Internal forces and the center of gravity help explain how objects stay in balance. These mechanics ideas matter for structures, machines, and vehicles that must remain stable under different loads and conditions. Internal forces are created inside a body when its particles interact. They can appear as tension, compression, or shear forces. These forces act in collinear pairs with equal magnitude and opposite direction. Between connected parts, they cancel each other and help keep the body in...

alternative sets of equilibrium equations

alternative-sets-of-equilibrium-equations

Equilibrium Conditions for a Supported Plate

Equilibrium conditions for a supported plate are used to describe when forces and moments balance. In this state, the plate has no net movement and no rotation. Engineers use these equations to study how structures behave under external loads. In many cases, the standard equilibrium equations are enough. But some systems need an alternative set of equations to match the geometry of the support points. A rectangular plate supported at points A, B, and C is one example. For this plate, the...

two force member

Two-Force Body Equilibrium

A two-force body is a rigid body acted on by only two external forces. In equilibrium, those two forces must have the same magnitude, the same line of action, and opposite directions. This balance is what keeps the body at rest. For a plate with forces F1 and F2 applied at points A and B, equilibrium means the sum of moments about any axis is zero. If moments are summed about point A, the moment from F2 must be zero. That means the line of action of F2 must pass through point A. The same idea...

three force member

Solving a Three-Force Member Example

A three-force member is a rigid body acted on by three forces at three points. The forces must have concurrent lines of action. If the forces are parallel, their lines of action stay parallel instead. A dumpster provides the example used here. It is connected to a pin support at point A and to a pin on a hydraulic cylinder at point B. The hydraulic cylinder acts as a two-force member in equilibrium. The dumpster weight acts through the center of gravity, and the support reaction acts at point...

equations of equilibrium in three dimensions

equations-of-equilibrium-in-three-dimensions

Checking Force Balance in 3D Structures

Checking force balance in 3D structures is a key step when a system is at rest. The vector and scalar equations of equilibrium are used to test whether a body is stable and will not collapse or fall apart. These equations give a clear way to study the forces acting on a body. The vector equations of equilibrium require the vector sum of all external forces on a body to equal zero. They also require the vector sum of the couple moments and the moments of all forces about a point to equal zero.

support reactions in three dimensions

3D Support Types for Stability and Motion

Support reactions in three dimensions keep structures stable and in equilibrium. They stop unwanted translation and rotation, so a design can handle external forces safely and work as intended. These reactions are important in many structures and systems. A ball and socket joint is one support that allows free rotation about any axis. It does not provide a moment that resists turning. At the same time, it restricts motion in space with three reaction forces along the three dimensions. A...

constraints and statical determinacy

Constraints in Structural Equilibrium

Constraints in structural engineering control how a body can move and help keep it in mechanical equilibrium. A constraint is a restriction on motion. When the right number of constraints is used, the system can stay balanced with the fewest supports needed. A system with the proper number of supports is called statically determinate. In that case, the unknown reaction forces can be found from equations of equilibrium. These systems are the easiest to analyze and design because the forces can...

key terms and concepts

Learn how roller, pin, and fixed supports react to coplanar forces, and how each one limits translation or rotation in structures.

Types of Structural Supports | JoVE K12

JoVE Core Mechanical Engineering offers concise, easy-to-understand animated videos covering key topics such as equilibrium, forces, truss analysis, and structural mechanics. Explore their real-world applications, and witness these concepts in action through scientist-led experiments.

mechanical engineering

Types of Structural Supports

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