Investigation and analysis on the damage of masonry buildings in the urban area of Mianzhu during "5·12" Earthquake

Dameges to the masonry buildings in Mianzhu urban area are described and different damage forms are classified according to the field records,and some preliminary analysis is offered.As a whole,the ratio of collapsed houses in Mianzhu urban area is very little,reaching the seismic fortification target,although it rarely is subject to earthquake that is higher than local fortification intensity.It is also necessary to pay attention to some new failure phenomena of structures,such as integrity slip destruction of building,large scale damage of walls under windows,and so on.In addition,some buildings which don't comply with the requirements for seismic design are illustrated and analyzed.