Question

木质矩形截面梁受均布载荷σ=10mpa校核梁的强度

Answer 1

问：木质矩形截面梁受均布载荷σ=10mpa校核梁的强度

答：建筑工程技术-力学试题3.图示简支梁为矩形截面，许用应力〔a〕=10Mpa，试校核梁的强度？解：最大应力在梁中间处，最大弯矩：Mmax =q(L^2)/8 = (4kN/m)x(6m^2)/8 = 18kNm对z轴抗弯截面模量：Wz = b(h^2)/6 =(0.2m)x(0.3m^2)/6 =0.003m^3最大拉应力：σmax = Mmax/Wz = 18kNm/0.003m^3 = 6000kPa =6MPa < 10MPa答：梁的抗弯强度足够。