10D. DIMENSIONING PART 4/4

CHAPTER 10D 'DIMENSIONING' 40 Masonry with concrete mantle - Remarks: What is affected? The placement of the concrete jacket affects the following: • the equivalent thickness • the specific gravity • the Elasticity Measure • the characteristic compressive strength • the characteristic Shear Strength. Notes: Since the equivalent thickness and Modulus of Elasticity changes it means that the tension of the elements is different than without sheathing. So I will have to change the thickness of the surface elements and rerun analysis. What controls are in place? The checks carried out are the same as those carried out on an unjacketed wall. That is, the provisions of Eurocode EC8-3 (Annex C) concerning: • In-plane shear • In-plane bending What parameters are changing? The changes brought about by the installation of a mantle on a masonry wall relate : -Equivalent Thickness -Special Weight -Thermal Resistance -Characteristic compressive strength -Elasticity measure It is obvious that some parameters do not change. There are two reasons: 1. Not used or not needed in EC8-3 controls. 2. These are parameters that do not change (e.g. shear strength of unloaded masonry) but are used or needed in the EC8-3 checks. Similar differences are seen in the valuation issue. Note: But what about the shear strength? Why do I only see "Initial" values? The reason is that the shear strength depends on the axial load and therefore there is no maximum value that is representative for the whole wall. To resolve this , in the table in the figure below, there is a column in which the shear strength value for the critical combination is given.