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本文采用不同的上部结构截面刚度,不同的筏基厚度和不同的有效应力弹性模量来探讨置于非均质土层上的筏基空间框架结构对共同作用分析的影响。通常,对置于非均质土层上筏基空间框架结构的共同作用分析需大容量的电子计算机,费用十分昂贵。本文采用了非常经济的简化方法。此简化方法是由金(King)和本文作者姚在英国“结构工程师”(The Structural Engineer)杂志一九八三年九月刊所介绍的。文中分析了一典型结构,得到了一些对设计非常有用的结论:第一,当上部结构的截面刚度改变时,对地基的沉降差影响很小,而对上部结构本身内力则影响很大。第二,适当改变筏基的刚度,对基础的沉降差和上部结构内力均有较大的影响。但不适当地增加过多,则影响很小,相反造成经济上的不合理。随筏基厚度的增加,筏基中的内力增加很大。第三,当土的有效应力弹性模量变化时,对建筑物的总沉降影响很大,但对上部结构和筏基中的内力及沉降差则影响很小。
In this paper, different superstructure stiffnesses, different ramyl thicknesses and different effective elastic moduli are used to investigate the influence of helium-based space frame structures placed on heterogeneous soils on the analysis of joint action. In general, the analysis of the co-action of the Raft-based space frame structure on the heterogeneous soil layer requires a large-capacity electronic computer, which is very expensive. This article uses a very economical simplification. This simplified method was introduced by King and author Yao in the September 1983 issue of The Structural Engineer magazine. The paper analyzes a typical structure and obtains some conclusions that are very useful for the design. First, when the section stiffness of the superstructure changes, it has little effect on the settlement difference of the foundation, but it has a great influence on the internal force of the superstructure itself. Secondly, the appropriate change in the stiffness of the sulfhydryl group has a greater impact on the difference in settlement between the foundation and the internal force of the upper structure. However, if it is inappropriately increased too much, the impact will be small. On the contrary, it will cause economic irrationality. As the thickness of the thiol increases, the internal force in the thiol increases greatly. Third, when the soil’s effective stress elastic modulus changes, it has a great influence on the total settlement of the building, but it has little effect on the internal forces and settlement differences in the superstructure and the raft foundation.