Abstract: A building response function defining a response of a building to specific environmental change, e.g., occurrence of a fire, in terms of the building structure, is stored in a computer. Also stored is a refuge motion function defining the refuge motion of individuals in terms of attributes of the individuals and the building response. The building response is computed by substituting design values of the building structure into the response function. Attributes of persons are inputted to the computer, and individuals' refuge motion is computed by using both inputted attributes and the computed building response. With the inputted and computed values, three-dimensional (3D) simulation images of the building structure, of the building response, and of individuals' refuge motion are computed. Then, a superposed 3D simulation image of the three images is displayed to facilitate analysis of the building performance.

Abstract: A computer 8 stores a response function 21 defining relation between the structure of a building and response 3 of the building to an environmental change. A 3-dimensional (3D) simulation image Is1 of the building is computed based on design values 11 of the building structure. The response 3 is computed by substituting the design values 11 in the response function 21, and a 3D simulation image Is3 of the response 3 is computed. The two 3D simulation images Is1 and Is3 are superposed so as to produce a superposed 3D simulation image Is. With comparison the 3D images Is1 and Is, i.e., images before and after the change, the response 3 to the change is visualized and analyzed as performance of the building. Preferably, the response 3 is expressed as a function of both the structure and equipment installed therein, and the response 3 of the building is computed based on the structural design values 11 and equipment design values 12.