摘要:
反拱底板是将单拱或连拱倒置于地基之上,建筑物的荷载主要由墩墙传到拱脚,再通过拱与墩的共同作用传入地基。本文研究反拱内力与变位(包括拱脚转角、拱脚拱顶竖向变位与水平位移)、墩基与地基变位、地基反力、结构与地基土层性质、各种荷载(包括边荷载)作用、温度变化(包括平均温度变化及上下温差变化)等因素之间的内在联系。通过力的平衡和墩与拱、墩拱与地基变形协调,求解反拱内力及墩与拱的有关变位。文中用迭代法处理基底摩擦力、凝聚力与水平位移的。关系,并通过二程实践与分析,对这种结构的特性得出一些新的认识。
Abstract:
Inverted-arch floor laid on the subsoil as foundaion of hydraulic structures are discussed. Loads acting on the structure are transmitted from the piers to the springs, then by the concordant action of the arches and piers to the subsoil. Interrelations among following factors: internal forces of arches, rotation angles of spring, vertical and horizontal displacements of springs and crowns, displacements of the base of the piers, foundation settlements, foundation reaction, characters of strctural material and soil layers, various loads including the side load, change of average temperature and temperature difference between the extrados and intrados etc. were studied. By means of equilibrium of forces and displacement compatibility of piers, arches and the subsoil, the internal forces and displacements of the inverted arch were solved. Iteration is applied to treatment of horizontal displacements of the piers and arches which are related to the friction and cohesion beneath the foundation base. New knowledge for some characteristics of this kind of structure is obtained from engineering practices and analysis.
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