CAPACITY OF MASONRY ARCHES AND SPATIAL FRAMES
CAPACITY OF MASONRY ARCHES AND SPATIAL FRAMES
复制标题
砌体拱门和空间框架的承载能力
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
P. Roca
中科院分区：
文献类型：
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作者：
C. Molins;P. Roca
本文提出了一个研究空间结构的数值模型，该模型由变截面的三维弯曲构件组成，并将其应用于骨架砌体结构的非线性几何和材料分析。在剪切和压缩应力下，通过弹塑性本构方程的非线性材料行为包括在模型中，而线弹性完全脆性行为假设在拉伸。通过莫尔-库仑破坏准则考虑了抗剪强度对外加压缩的依赖性。考虑了结构变形时平衡条件的施加所引起的几何非线性效应，但假定位移和截面转角的增量都很小。三个例子。第一种是以前由Young和Scordelis（1958）研究的圆形螺旋面。一个非常好的协议和准确度的水平，即使是非常小的元素，两个或三个，被使用。第二个例子涉及分析的砌体拱破坏，包括非线性材料和几何效应。最后，通过对一个哥特式拱顶的分析，说明了该方法在大型结构分析中的优越性。砌体拱和框架的极限承载力分析对砌体框架和桥梁的日益关注，无论是在欧洲和其他地方仍在使用的，还是那些仅仅具有历史价值的，都产生了对发展准确，合理有效的分析方法的极大兴趣。虽然大部分的工作集中在单拱的评估上，但也有专门针对更复杂结构（如多跨拱桥）的分析提出的建议。
A numerical model for the study of spatial structures consisting of curved, three-dimensional members with variable cross sections is presented, together with its application to the nonlinear geometric and material analysis of skeletal masonry constructions. Nonlinear material behavior is included in the model by means of elastoplastic constitutive equations under shear and compressive stresses, while a linear-elastic perfectly brittle behavior is assumed in tension. The dependency of shear strength upon the applied compression is taken into account by means of the Mohr-Coulomb failure criterion. Nonlinear geometric effects caused by the im position of the equilibrium condition upon the deformed configuration of the structure are considered, but it is assumed that the increments of both displacements and sectional rotations are moderately small. Three examples are presented. The first is a circular helicoid formerly studied by Young and Scordelis (1958). A very good agreement and accuracy level were obtained, even though a very small number of elements, two or three, were used. The second example deals with the analysis of a masonry arch up to failure including nonlinear material and geometric effects. Finally, the advantage of the presented formulation in the analysis of large structures is shown through the study of a Gothic vault. ANALYSIS OF THE ULTIMATE CAPACITY OF MASONRY ARCHES AND FRAMES The growing concern about masonry frames and bridges, both those still in use in Europe and elsewhere and those of merely historical value, has produced a remarkable interest in the development of accurate, reasonably efficient methods for their analysis. Although most of the effort has concentrated on the assessment of single arches, there are also proposals spe cifically developed for the analysis of more complex struc tures, such as multispan arch bridges.