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超静定结构中的扭矩,只有在杆件的扭转刚度为已知的清况下才能求出。本文提供了一种开裂以后扭轉刚度的理論,这个理論是利用开裂后剪切模量的新概念推导出来的。这个新的概念使該理論能普遍适用于任意截面,并使开裂后扭轉刚度的推导得以簡化。
The torsion in the statically indeterminate structure can only be found if the torsional stiffness of the rod is known. This paper presents a theory of torsional stiffness after cracking, which is derived from a new concept of shear modulus after cracking. This new concept allows the theory to be universally applicable to arbitrary sections and simplifies the derivation of torsional stiffness after cracking.