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在工业厂房设计中,常因设备布置的要求而使次梁的布置不太规则,因此作用于主梁上的集中荷载,三角形或梯形荷载是不规则的。这些不规则的荷载,使主梁的计算显得相当复杂。本文的目的在于提出一个简便的计算主梁的方法。 均布荷载常为作用于楼板上的主要荷载。经过次梁和楼板而传到主梁上的荷载,因情况不同而为集中荷载、三角形荷载或梯形荷载。这些荷载简图虽然和均布荷载形式不同,但这些荷载是由均布荷载演变而来的,它们与均布荷载密切相连,具有内在的同一性,可以回复于均布荷载的形式而计算之。本文就是用均布荷载运算形式,以简化主梁的内力计算。 由公式的推导过程看来,本文所述的方法仅当次梁间距相等时,才是精确的,但经过若干实例的验算,证明本文所提出的方法,应用于次梁布置很不规则的情况,所算得的主梁内力仍然相当精确(误差在5％以内),可以在设计中采用。
In the design of industrial plants, the arrangement of secondary beams is often irregular due to the requirements of equipment layout, so it acts on the concentrated loads on the main beams, and the triangular or trapezoidal loads are irregular. These irregular loads make the calculation of the main beam complicated. The purpose of this paper is to propose a simple method for calculating the main beam. Uniform loads often act on the main load on the floor. The load transmitted to the main girder through the secondary girders and slabs is a concentrated load, triangular load or trapezoidal load depending on the circumstances. Although these load profiles are different from uniform load forms, these loads are derived from uniformly distributed loads. They are closely linked to uniform loads, have inherent identity, and can be calculated in the form of uniform loads. . This paper uses the uniform load calculation form to simplify the internal force calculation of the main beam. From the formula derivation process, the method described in this paper is only accurate when the secondary beam spacing is equal, but after several examples of verification, the proposed method is applied to the situation where the secondary beam is very irregularly arranged. The calculated internal force of the girder is still quite accurate (within 5% error) and can be used in the design.