Vehicle body floor structure

1. A vehicle body floor structure comprising:

a floor

a side sill extendedly arranged at a side of the floor and in a longitudinal direction of a vehicle body to have a closed section;

a pair of floor cross members extendedly arranged on the floor in a widthwise direction of the vehicle body, so as to face with each other in the longitudinal direction of the vehicle body; and

a first reinforcing member, provided between the pair of floor cross members in the longitudinal direction of the vehicle body and within the closed section of the side sill, to exhibit a property allowing a dimensional condition thereof to be maintained against a side collision load,

wherein the side sill is formed with an inner member and an outer member having a hut section, and the closed section of the side sill is formed by joining the inner member and the outer member with each other, and

wherein the first reinforcing member has a closed section formed by closing the first reinforcing member with respect to the inner member of the side sill.

2. The vehicle body floor structure according to claim 1 , wherein the property of the first reinforcing member is set in consideration of a deformation mode of the side sill, when impact force is applied on the side sill toward the vehicle widthwise direction.

3. The vehicle body floor structure according to claim 1 , wherein a shape of the first reinforcing member is formed along the closed section of the side sill.

4. The vehicle body floor structure according to claim 1 , wherein the inner member of the side sill is a flat plate-like member.

5. The vehicle body floor structure according to claim 1 , further comprising:

a second reinforcing member provided within the closed section of the side sill, so as to correspond to one of the end portions of the pair of floor cross members in the vehicle widthwise direction; and

a third reinforcing member provided within the closed section of the side sill, so as to correspond to the other of the end portions of the pair of floor cross members in the vehicle widthwise direction.

6. The vehicle body floor structure according to claim 5 , wherein the first reinforcing member is located between the second reinforcing member and the third reinforcing member in the longitudinal direction of the vehicle body.

7. The vehicle body floor structure according to claim 5 , wherein a length of the first reinforcing member in the longitudinal direction of the vehicle body is set in consideration of a length between the second reinforcing member and the third reinforcing member.

8. The vehicle body floor structure according to claim 5 , wherein the first reinforcing member, the second reinforcing member, and the third reinforcing member control a deformation mode of the side sill in cooperation with each other, when impact force is applied on the side sill toward the widthwise direction of the vehicle body.

9. A vehicle body floor structure comprising:

a floor;

a side sill extendedly arranged at a side of the floor and in a longitudinal direction of a vehicle body to have a closed section;

a pair of floor cross members extendedly arranged on the floor in a widthwise direction of the vehicle body, so as to face with each other in the longitudinal direction of the vehicle body; and

reinforcing means for reinforcing the side sill provided between the pair of floor cross members in the longitudinal direction of the vehicle body and within the closed section of the side sill, the reinforcing means exhibiting a property allowing a dimensional condition thereof to be maintained against a side collision load,

wherein the side sill is formed with an inner member and an outer member having a hut section, and the closed section formed by joining the inner member and the outer member with each other, and

wherein the reinforcing means has a closed section formed by closing the first reinforcing member with respect to the inner member of the side sill.