the set pair analysis method that deal with uncertain problem of system and Markov chain theory that research the transition law of system state was appled to establish the dynamic assessment model for safety management of bridge construction. Taking a bridge construction project as an example, this paper conduct a dynamic assessment through five time intervals and come to a conclusion that the assessment results are general and they need rectification, but the system state is developing into a favourable level. And the evaluate results verify the rationality of the model.
Basing on the index system and evaluation data of bridge construction safety management status, this paper puts forward the relative difference function of variable fuzzy set by the method of set pair analysis, and develops the fuzzy comprehensive evaluation dynamic model of bridge construction safety management status. This model was applied to assessment of a bridge construction safety management status, and achieved the desired results.
According to the design proposal of prefabricated bamboo composite wall components that with the functions of heat preservation, heat insulation, heat conduction and energy accumulation, a method to calculate the effective area of the component’s cross section is proposed in this paper. The prototype compressive tests of prefabricated bamboo composite wall components have been carried out using large scale test loading devices. The test results show that after adding the movement joint of the plywood outside the component, the compression strength has increased 39% due to circular bamboo, wood border and panel in the component have reached a common strength bearing state, therefore optimize the design proposal.
Trend assessment of safety management status described the variation of the safe state during the process of construction, and it is an early warning of safe accidents to some extent. So the study of it is becoming a burning question. Aim at the uncertainty and the dynamic characteristics of the system; the trend assessment model of bridge construction safety management status has been set up using the theory set-pair analysis and Markov chain. The application results show that this model can predict the safety management status of the next and final stage relatively accurately, and it can play a guiding role in preventing safety accidents.
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