Judging by your comments and Roi's answer, it seems to me that structural violence is a form of violence that has become a social norm under certain circumstances. The structure here is the social structure. In refugee camps, a social structure will emerge where everyone turns a blind eye to certain acts of violence (usually involving the rape of women).

How about giving us the context where you saw this?

Structural violence is a term first used in the 1960s commonly ascribed to Johan Galtung. It refers to a form of violence based on the systematic ways in which a given social structure or social institution harms people by preventing them from meeting their basic needs. Institutionalized elitism, ethnocentrism, classism, racism, sexism, adultism, nationalism, heterosexism and ageism are some examples of structural violence. Life spans are reduced when people are socially dominated, politically oppressed, or economically exploited. cowboy..

it's nothing. cowboy...

Quote one of the sentences where it appears.