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建筑法规СНиПⅡ-21-75建议按下式计算斜裂缝扩展宽度: a_T=c_дK(h_0+30d_(макс))η/μп·t~(2)/E_a~2 (1) 式中系数C_д考虑在长期荷载或多次重复荷载作用下裂缝宽度的发展。对轻质混凝土构件应取C_д=1.5。但是对两种作用只用一个系数的方法,不能反映现象的本质。因为裂缝扩展的宽度与混凝土的种类和强度、纵向和横向配筋、荷载作用的强度、循环次数和特
The Building Code СНиПII-21-75 proposes the following formula to calculate the diagonal crack extension width: a_T=c_дK(h_0+30d_(макс))η/μп·t~(2)/E_a~2 (1) where the coefficient C_ д is considered The development of crack width under long-term load or multiple repeated loads. For lightweight concrete components C_д = 1.5 should be taken. However, the use of only one coefficient for both effects does not reflect the nature of the phenomenon. Because of the width of crack propagation and the type and strength of concrete, longitudinal and transverse reinforcement, the strength of the load, the number of cycles and special