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R-WALL 2 Stability Assessment and Design of Cantilever Reinforced Masonry Retaining Walls l PRODUCTS & SERVICES l SLABS l R/C COLUMN l R/C BEAM l FOOTING l STRESS 2D l SPIRAL STAIRS l BEAM l SPAN l SLABS SUPPORT l
R-WALL is a new software product for assessment of stability and design of the reinforced masonry retaining walls. The software is based on a standard analytical approach, which follows AS 4678 - 2002, AS3600 and AS3700 for stability assessment, and design of the concrete base and the masonry.
R-WALL software provides a simple user interface, which allows the user to choose from one of the four pre-defined retaining wall types, and specify the design parameters. Once, all input data are entered, the user can perform analytical check for the stability and strength. The stability check includes overturning, sliding and load bearing failure of the base. The strength includes check of the stem and the concrete base. The design follows the ultimate limit state principle. It takes into consideration the following ultimate limit state modes:
(Refer to the AS 4678-2002 Clause 3.2)
The software evaluates the earth pressure acting on the wall and multiplies the load by the appropriate load factors. The forces resisting instability are also calculated and reduced with factor recomended in AS 4678. The ratio between these two factored loads defines the Safety Factor against overturning. The design of the reinforcement of the masonry and the concrete base is performed using the factored load. The usage of the software is based on trial-and-error approach. Initially, the user enters some design parameters, including all dimensions and the reinforcement, and the software will evaluate the stability against overturning and it will check strength of the concrete base and the masonry wall. If either stability or strength criteria are not satisfied the user must change some of the input parameters until the all design criteria are satisfied.
The soil pressure at the base and the soil bearing capacity are calculated by the software. The user should evaluate the load bearing capacity safety factor in order to determine the base dimensions. When the base bearing width is less then the width entered by the user, it is an indicating that there is an uplift of the base, which is not allowed. In this case the user must increase the width of the base. The values for the mechanical characteristics of the foundation and backfill soil suggested by the software are indicative, and the user should determine their values for a specific design job.
l PRODUCTS & SERVICES l SLABS l R/C COLUMN l R/C BEAM l FOOTING l STRESS 2D l SPIRAL STAIRS l BEAM l SPAN l SLABS SUPPORT l
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