Through the comparative tests of prestressed and non-prestressed brick-walls un-der the repeated lateral loading

the effect of the prestress-force to the strain distribution in the non-prestressed bars of the structural columns has been investigated.This effect is beneficial:the pre-stress-force will reduce the value of strain in the bars of the lower part in the columns and uniformize the strain distribution along the whole height of the columns.Furthermore

instead of a strainreduction

the strain of prestressed be will increase along with the increasing of the lateral load.Thus

the coefficient of prestress-force-increase could be calculated in the tWo stages of the crack-resistance and ultimate bearing capacity.As a result

both the prestressed and non-prestressed barsare able to give the potential of their bearing capacity a full play

and improve the earthquake-resis-tant property.