Low-rise buildings with gable roof are widely distributed in cities and suburbs,and tends to be densely arranged.The wind-induced interference effects among adjacent buildings are significant.The aerodynamic interference effects of surrounding buildings may lead to a significant increase on the overall or local wind load of target buildings,which is obviously different from an isolated building.In this paper,wind tunnel tests were carried out to study the wind load characteristics of 6 kinds of isolated low-rise buildings with gable roof,and the influence of roof slope,length-width ratio,building spacing and wind direction on the interference effects of wind load on building groups with 3 rows and 1 column.The total test case is 1584.(1)The influence of roof slope and length-width ratio on the mean and peak wind pressure coefficients of the isolated low-rise building with gable roof were investigated.The results show that the wind pressure characteristics on the roof of 10 degrees are similar to that of flat roof building.The wind suction is large on the leeward roof of the building with gable roof of 35 degrees,and the mean and minimum pressure coefficients on the leeward roof increase significantly with the increase of length-width ratio,the most unfavorable wind pressure coefficients can increase by 200%.(2)Furthermore,the mean and peak wind pressure coefficients on upstream,central and downstream buildings located in the building groups with 3 rows and 1 column are studied when the wind direction is perpendicular to the roof ridge of building.For the gable roof of 10 degrees,the wind pressure on the roof of upstream building is slightly reduced,and the wind pressure on the central and downstream buildings is reduced more significantly.For the gable roof of 35 degrees,the interference effects are significantly different from that of building groups with gable roof of 10 degrees.When the building spacing is small enough,there is a strong air flow feedback effect between the central building and the upstream building,which leads to a notable increase of the wind pressure on the leeward roof of the upstream building compared to that of an isolated building.The most unfavorable mean pressure coefficient and minimum pressure coefficient can increase by 40%and 100%,respectively.The wind suction on the windward roof of central building and the amplitude of minimum wind pressure coefficients on the leeward roof is increased significantly,however,the amplitude of mean wind pressure coefficients on the leeward roof is decreased.The wind pressure interference effects on the roof of downstream building is similar to that of the central building,but the amplification effects on the windward roof are less than that of the central building.With the increase of length-width ratio,the maximum spacing(i.e.critical spacing)that the upstream building is affected by the air flow feedback effect is amplified.The critical spacings for the upstream building with length-width ratio of 2,4 and 6 are 0.5 times,1 times and 2 times of the eave height,respectively,when the air flow feedback effect is considered.(3)The influence of roof slope,length-width ratio and building spacing on the lift force coefficients and peak pressure coefficients as well as its interference factors of roof is investigated.For the gable roof of 10 degrees,the most unfavorable minimum wind pressure coefficient in all wind directions on the roof zones of the edge building close to the central building is mainly reduced,however,the minimum wind pressure on the roof zones that is far from the central building is amplified,with a maximum amplification effect of 40%.The most unfavorable minimum wind pressure coefficient in all wind directions on the roof zones of the central building is mainly reduced.For the gable roof of 35 degrees,the pressure coefficients on the roof zones of the edge building close to the central building,and the zone located in the long side of roof that is far from the central building are amplified.The maximum amplification effect on the central zone of roof close to the gable wall and the central area of the roof for the central building can up to 90%and 60%,respectively.The most unfavorable minimum pressure coefficient in all wind directions on the roof corner of the central building is increased,and the maximum amplification effect can up to 80%.For the gable roof of 10 degrees,the amplification effects on the roof of the central building and the edge building is decreased gradually with the increase of length-width ratio,however,the reduction effect is increased gradually.For the gable roof of 35 degrees,the most unfavorable minimum pressure coefficient in all wind directions on the roof corner areas close to the central building is increased gradually with the increase of length-width ratio,the minimum value of wind pressure interference effects on the area close to the gable wall of central building varies little,and the amplification effect on other zones is decreased gradually,however,the reduction effect is increased gradually.