"Вестник МГСУ"

During design and production of wooden structures there often arises a problem of durability, strength and bearing capacity of buildings and structures. This issue is especially current during reconstruction, because the proper choice of connection influences the technical possibility of the works. For this aim different types of connectors are used. One should also remember that distinct anisotropic behavior is characteristic of the wood. In the given article the authors consider technical characteristics and examples of the use of certain types of timber connections, which have been developed over the last century. The advantages and disadvantages of different types of connectors, such as ring-type, tee and disk timber connectors, claw plates and paste-in washers, steel adhesive wavy toothed dowels are analyzed. The range of products and bearing capacity values of some connectors are offered. The authors make a conclusion, that in order to increase durability, strength and operation reliability of connectors it is advisable to use clamping plates which have resilience and some advantages of fractionality principle characteristic of multi-nailed connections. It is also advisable to use calculation methods corresponding to the requirements of the requirements SP and Eurocode.

Requirements applicable to urban construction and investment programmes are considered in the proposed paper. The authors identify the principal problems that prevent successful implementation of the programme-oriented approach and formulate the initial set of the top-priority objectives. They include the basic parameters of the development strategy, indicators of the economic strength of the Programme, overview of any available resources and efficiency of their use in the past, criteria of efficiency of the Program, its constituent blocks and separate actions, methodological recommendations and procedures, mechanisms of distribution and re-distribution of the budgetary funding, commercial risks and procedures that accompany the concentration of urban resources, forms and methods of public control, incentives designated to get co-developers involved into the Programme. The new outlook applicable to the attainment of the pre-set objectives corrects the economic essence of the Programmes. It consists in the system-based representation of the Programme actions as a collection of regulatory, management, and financial modules designated to substantiate and explain the target-oriented criteria. In pursuance of the above, the target essence of the economic simulation of the strategy of urban assets management as part of the Programme actions is identified. The authors believe that an integrated Programme may assure sustainable development of the urban area acting as a self-reproducing system capable of facilitating the satisfaction of ever-growing needs of urban residents and corporate entities, guests and partners of cities and towns, that represent an integral social and economic system in its development.
In the context accepted by the authors, attainment of the above objective will involve fulfillment of each of the aforementioned requirements. They are to assure the concentration of resources and comprehensive satisfaction of the needs of the urban population in terms of the most popular items of real estate within a particular time span.

The article covers the concepts, definitions and correlations of parameters of worn surfaces
within the coordinate system of relative pressures and convergences of interacting elements of
construction machines.
The authors provide their findings based on the research of microtopographic and tribological
engineering parameters of scoop hinges of construction drags and fused crushing plates of jaw
crushers. As for the drag hinges, the friction pair is to include steel 110Г1ZL and X-5 padding that
demonstrates high resistance to friction (=1.04) and low temperature of frictional heating (ƒ= 90
°C). Mobile plates of jaw crushers need electrodes VSN-9 and TsN-16 for padding purposes, as they
demonstrate the biggest frictional fatigue values (= 2.76 and 2.62, respectively) and insignificant
temperature of heating of friction surfaces (9.4 and 4.9 °C). Electrodes TsN-16, T-590 and KBKh-45
are recommended for fixed plates.
Microtopographic parameters of worn friction surfaces are used to analyze the main tribological
engineering parameters of operating elements and joints of construction machines and items of
equipment.

Subject: the article considers one of the possible solutions to the problem of choosing the optimal waterproofing system for underground parts of buildings and structures using logical-probabilistic method. Selection of reliable hydro insulation of underground structures is a complex multi-task, and for successful functioning of the insulation it is necessary to focus on the systematic approach upon its creation. When choosing a waterproofing system, it is necessary to solve a multi-task and account for the specifics and status of a specific object, hydrogeological conditions, the depth of the structures, acting loads, the quality of construction works, etc. Apriori neglect of these factors and the lack of a systematic approach in the selection of hydro insulation system lead to accelerated wear and failure of structures. During operation as the main stage of life cycle of the building, the waterproofing of underground load-bearing frames of constructions is exposed to several rather difficult conditions. Hence, to avoid frequent overhaul, they should be chosen with the increased operational properties. The irregular choice of the protective coating leads to the accelerated wear and failure of the design. Objective assessment of the right choice of protective materials for an underground waterproofing and also selection of the most reliable and long-lived materials, especially for the bases, is a relevant task. The scientific novelty of this work consists in theoretical justification and the proof of a possibility of objective assessment of the choice of long-lived protection of designs of an underground part of buildings with the use of a logical-probabilistic method. Criteria of operational assessment of optimum long-lived materials are established and also the model of a tree of failures for different types of original materials of organic and mineral structure is proposed: bituminous, bituminous and polymeric, elastomeric, thermoplastic, clay, cement. Research objectives: choose an effective and durable hydro insulation system for underground structures of buildings under certain conditions of their operation using mathematical models and tools. Materials and methods: the “wall-foundation plate” system is considered which includes waterproofing membrane, waterproofing key, a repair mix, fillet, foundation mat, cast in-situ reinforced concrete, drainage geocomposite. We have applied logical-probabilistic method, the idea of which is the description of possible ways of functioning of the system by means of mathematical logic and the determination of its operability with the help of probability theory. Results: logical-probabilistic method allows us to analyze alternative options for creating waterproofing system by means of description of the possible ways of functioning of the variants being analyzed with the help of mathematical logic and determine the probability of their operability, based on which the optimal system that meets the requirements can be selected. A lot of factors were considered including the specificity and a status of a specific facility, hydrogeological conditions, depth of structures, acting loads, the quality of construction and installation works, etc. Conclusions: for achievement of the goal of the research, a set of factors including specificity and a condition of a specific facility, hydrogeological conditions, depth of structures, acting loads, quality of installation and construction works, etc. was considered. Taking into account the specified factors and systematic approach when choosing the waterproofing system proved its effectiveness by use of a logical-probabilistic method as the most accurate and reliable mathematical method.