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Seismic behavior of beam column Joint

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Pavan Kumar N
Pavan Kumar N

This document discusses the seismic behavior of beam-column joints in reinforced concrete moment frames. It begins by introducing beam-column joints and their importance. It then explains that joints have limited strength and are vulnerable to damage during earthquakes. To prevent this, joints must be designed to resist earthquake effects. The document outlines how beams apply moments to joints during quakes and how this can cause diagonal cracking if the joint is not reinforced properly. It concludes that providing large column sizes or steel ties in the joint can prevent such cracking and damage.

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SEISMIC BEHAVIOR OF BEAM COLUMN JOINTS IN REINFORCED CONCRETE MOMENT RESISTING FRAMES PAVANKUMAR N 4BW13CSE08 2ND SEMESTER M.TECH STRUCTURAL ENGINEERING GUIDE- Mr. CHETHAN GOWDA R K
 Introduction to Beam-Column Joint  Types & Importance of Beam-Column Joint  Seismic Behaviour of Joints  Reinforcing Beam-column Joints  Provision for Horizontal ties in beams  Anchorage of beam bars  Exterior joint  Interior Joints
 In RC buildings, portions of columns that are common to beams at their intersections are called beam- column joints.
Seismic behavior of beam column Joint
 Since their constituent materials have limited strengths, the joints have limited force carrying capacity.  When forces larger than these are applied during earthquakes, joints are severely damaged.  Repairing damaged joints is difficult, and so damage must be avoided. Thus, beam-column joints must be designed to resist earthquake effects.
Under earthquake shaking, the beams adjoining a joint are subjected to moments in the same (clockwise or counter-clockwise) direction . Under these moments, the top bars in the beam-column joint are pulled in one direction and the bottom ones in the opposite direction .
If the column is not wide enough or if the strength of concrete in the joint is low, there is insufficient grip of concrete on the steel bars. In such circumstances, the bar slips inside the joint region, and beams loose their capacity to carry load.
one diagonal length of the joint elongates and the other compresses . If the column cross- sectional size is insufficient, the concrete in the joint develops diagonal cracks.
 Diagonal cracking & crushing of concrete can be prevented in Joints. Mostly, for this large column size is the most effective.  Another way is providing steel ties also known as stirrups. Reinforcing the beam column joint
Seismic behavior of beam column Joint
Seismic behavior of beam column Joint
Seismic behavior of beam column Joint
Seismic behavior of beam column Joint
Seismic behavior of beam column Joint
Reference Seismic Behavior of Beam Column Joints in Reinforced Concrete Moment Resisting Frames, Document No. :: IITK-GSDMA-EQ31- V1.0 Final Report :: A - Earthquake Codes IITK-GSDMA Project on Building Codes How do beam-column joints in RC buildings Resist Earthquakes? IITK-BMTPC Earthquake tips20
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Seismic behavior of beam column Joint

  • 1. SEISMIC BEHAVIOR OF BEAM COLUMN JOINTS IN REINFORCED CONCRETE MOMENT RESISTING FRAMES PAVANKUMAR N 4BW13CSE08 2ND SEMESTER M.TECH STRUCTURAL ENGINEERING GUIDE- Mr. CHETHAN GOWDA R K
  • 2.  Introduction to Beam-Column Joint  Types & Importance of Beam-Column Joint  Seismic Behaviour of Joints  Reinforcing Beam-column Joints  Provision for Horizontal ties in beams  Anchorage of beam bars  Exterior joint  Interior Joints
  • 3.  In RC buildings, portions of columns that are common to beams at their intersections are called beam- column joints.
  • 5.  Since their constituent materials have limited strengths, the joints have limited force carrying capacity.  When forces larger than these are applied during earthquakes, joints are severely damaged.  Repairing damaged joints is difficult, and so damage must be avoided. Thus, beam-column joints must be designed to resist earthquake effects.
  • 6. Under earthquake shaking, the beams adjoining a joint are subjected to moments in the same (clockwise or counter-clockwise) direction . Under these moments, the top bars in the beam-column joint are pulled in one direction and the bottom ones in the opposite direction .
  • 7. If the column is not wide enough or if the strength of concrete in the joint is low, there is insufficient grip of concrete on the steel bars. In such circumstances, the bar slips inside the joint region, and beams loose their capacity to carry load.
  • 8. one diagonal length of the joint elongates and the other compresses . If the column cross- sectional size is insufficient, the concrete in the joint develops diagonal cracks.
  • 9.  Diagonal cracking & crushing of concrete can be prevented in Joints. Mostly, for this large column size is the most effective.  Another way is providing steel ties also known as stirrups. Reinforcing the beam column joint
  • 15. Reference Seismic Behavior of Beam Column Joints in Reinforced Concrete Moment Resisting Frames, Document No. :: IITK-GSDMA-EQ31- V1.0 Final Report :: A - Earthquake Codes IITK-GSDMA Project on Building Codes How do beam-column joints in RC buildings Resist Earthquakes? IITK-BMTPC Earthquake tips20