Mechanical calculation model, mechanical performance testing device and mechanical performance testing method for squared stone constructed stone wall mortar joint

Abstract

The invention provides a mechanical calculation model, a mechanical performance testing device and a mechanical performance testing method for a squared stone constructed stone wall mortar joint. The mechanical calculation model for the squared stone constructed stone wall mortar joint comprises a stone wall mortar joint unit model, vertical spring units and horizontal spring units are adopted to simulate mechanical behaviors of the stone wall mortar joint unit model in a vertical direction and a horizontal direction, the vertical spring units are linear units, and the horizontal spring units are nonlinear units. The testing device and the testing method for mechanical performance of the squared stone constructed stone wall mortar joint are provided according to needs determined by parameters of the mechanical calculation model. The mechanical calculation model has the advantages that the nonlinear characteristics of squared stone shearing and slipping along the mortar joint under reciprocating action of an earthquake and rigidity in vertical compressive deformation under combined action of the earthquake and vertical pressure are fully taken into consideration, an actual mechanical behavior process of the stone wall mortar joint unit model can be fitted better, and an accurate constitutive model is provided for finite-element earthquake reaction analysis for a stone structure.

Description

technical field [0001] The invention relates to a building mechanics model, a testing device and a testing method, in particular to a mechanical model, a testing device and a testing method of a lime joint in a masonry stone wall. Background technique [0002] The coast of Fujian is located in the circum-Pacific seismic zone. There are a large number of stone-structured residential buildings with stone walls as the main lateral force-resistant structural components in this area, which makes the earthquake resistance and disaster prevention work in this area severe. Under the action of earthquake, the slipping failure of lime joints in stone masonry walls is the main characteristic of earthquake damage of stone structures. The mechanical behavior and failure mechanism of stone wall lime joint elements under the action of vertical compressive stress and low-cycle reciprocating horizontal load are the key issues for establishing a nonlinear numerical simulation model for masonr...

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Problems solved by technology

[0003] At present, some theoretical analysis and experimental research on this issue have been carried out at home and abroad, but because the masonry technology and physical properties of the blocks of the stone wall are different from those of conventional building components, the gray joints of the wall established by this type of research The unit calculation model has the following problems: (1) simply use the Mohr-Coulomb friction theory to establish an ideal calculation model with a constant friction coefficient, ignoring the coefficient change from static friction to dynamic friction after the stone block slides along the ash joint, and also ignoring the change in the earthquake reciprocating (2) The stiffness of the shear-slip curve of the mortar joint in the existing calculation model remains unchanged, which does not conform to the actual mechanical behavior process of t

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