No abstract

This paper presents approximate closed-form plastic limit load solutions for branch junctions under out-of-plane bending and under combined pressure and out-of-plane bending, based on three-dimensional finite element limit analyses for an elastic-perfectly plastic material. When bending is applied to the branch pipe, the plastic limit loads for out-of-plane bending are shown to be lower than those for in-plane bending. However, for bending to the run pipe, the opposite trend is found. For combined pressure and out-of-plane bending, either the circular interaction or the parabolic interaction rule can be used, depending on the bending location and the branch geometry. Comparison with published experimental plastic limit load data shows that the predictions agree relatively well with the test data.

An integrated power network planning information system is developed, which can not only serve the business management functions of power network planning, but also provide assistant decision-making functions for planning. The system consists of three components, i.e. the basic data platform (BDP), planning business management subsystem (PBMS) and planning decision-making support subsystem (PDSS). BDP manages various kinds of basic data for planning, including socio-economic data, power plant data, power network equipment data, electricity demand data, load data, and so on. Meanwhile, BDP provides data supports for PBMS and PDSS. PBMS manages the working processes of various planning businesses, which come from the planning department of Guangdong Power Grid Corporation (GPGC), and are abstracted as workflows in the system. PDSS offers some computer-aided analysis and decision-making functions for planners in planning and project management processes. Applications and implementations in practical planning workshow that the proposed system can improve the informatization level, management and efficiency of planning work, versus traditional work patterns.