σmax = = = 10.24 MPa Note: σmax = can be put in this way: σmax = Where S is the section modulus = Example 7.2: A beam 100 mm wide by 300 mm height and 8 m long carries the loading show in fig. if the maximum flexural stress is 9 MPa , for what maximum value ϑ w will the shear be zero under P. and what is the value ϑP? Solution: ↱+∑ MR2 =0 R1 *8-P*2-8w*4=0 R1 = 4w+ The maximum value ϑ w to reduce the shear to zero is: 4w+ = 6 w
σmax = = = 10.24 MPa Note: σmax = can be put in this way: σmax = Where S is the section modulus = Example 7.2: A beam 100 mm wide by 300 mm height and 8 m long carries the loading show in fig. if the maximum flexural stress is 9 MPa , for what maximum value ϑ w will the shear be zero under P. and what is the value ϑP? Solution: ↱+∑ MR2 =0 R1 *8-P*2-8w*4=0 R1 = 4w+ The maximum value ϑ w to reduce the shear to zero is: 4w+ = 6 w
5_2018_04_24!08_36_07_PM.docx