gymnasium,k span 1.live load 75KG/m2 2.snow load 20cm at least 3.service life 40 years 4.single span 38m gymnasium,k span1.live load 75KG/m22.snow load 20cm at least3.service life 40 years4.single span 38m Advantages for the gymnasium,k span buildings1.it is of low cost,fast construction,and quick effect,about 10-50% cost can be saved compared with ordinary roofs under the same requirements2.it ...