Wind load on configuration details of low-rise building roof

This paper studied the loads on the configuration details of low-rise building roofs by the rigid model pressure measurement tests,which were often destroyed in wind disasters.The pressure coefficients and drag coefficients of the ridge,protruding gable wall and eaves gutter were examined,which were of varied heights and with or without the other 2 types of configuration details.The results show that the negative pressure of interior surface(the leeward surface for the ridge) of the configuration details end varies severely and the amplitude occurs when the wind obliquely blows to the exterior surface(the windward surface for the ridge),which leads to the very large worst peak net pressure coefficient towards the roof.The worst peak net pressure coefficients of the protruding gable wall,ridge and eaves gutter are about 18.0,10.5 and 7.0,respectively.However the peak pressure away from the roof(towards the windward surface for the ridge) is relatively stable.The worst peak net negative pressure of the lower tap is 5 larger than that of the higher tap on the same vertical plan of the protruding gable wall,while that of the lower tap is only 0.8 larger than that of the higher tap for the eaves gutter.When the roof is equipped with the other 2 types of configuration details,the worst peak net negative pressure coefficients of the ridge and protruding gable wall decrease much to 7.5 and 6.0 from 10.5 and 18.0,respectively,while that of the eaves gutter decreases to 6 from 7.The worst peak drag coefficients of the ridge and eaves gutter are not affected by whether the roof is attached with the other 2 types of configuration details or not,while that of the protruding gable wall is smaller when the roof is attached with ridge and eaves gutter.The worst peak drag coefficients of the protruding gable wall and eaves gutter are larger with the increase of each height.