The blast load is classified into free-air blast and surface blast following the location of explosion and surface. In this paper, several equations for blast load calculation are explained briefly and a modified equation for free-air blast load is suggested. The modified equation is based on Kingery-Bulmash equation which is used in UFC 3-340-02 and Conwep model. In this modified equation, the process of calculation is simplified against the original equation, and the number of coefficients is reduced under 5. As a result, each parameter of estimated data by modified equation has less than 1% of error range comparing with Kingery-Bulmash equation.

1. 서론
 2. 기존의 폭발하중 산정식
  2.1 폭발하중 시간이력곡선과 주요 파라메타
  2.2 기존의 폭발하중 산정식
 3. 수정된 폭발하중 산정식
  3.1 수정 산정식의 조건
  3.2 수정 산정식의 계수
  3.3 기존 방정식과 수정 산정식의 비교
 4. 결론
 References

• 전두진(정회원, 인하대학교 대학원, 박사과정) | Jeon Doo-Jin
• 이민재(정회원, 인하대학교 대학원, 석사과정) | Lee Min-Jae
• 한상을(인하대학교 건축공학과 교수, 공학박사) | Han Sang-Eul 교신저자