By reliability analysis, such parameters as safety probability (PR), intermediacy probability (PM) and failure probability (PF) should be found out to be combined into a reliability vector [PR,PM, PF].

It is successful to obtain the S-N curve by linear regression from the relative coefficient of low temperature fatigue experimental data. Different safety fatigue life can be estimated according to different safety probability.

Results of analysis should be safety probability(reliability),intermediate probability and failure probability. These factors combine to form the reliability vector.

In this paper, we discuss the statistics analysis for concrete test, which is doneforbuliding the road bridge on yellow river; using Weibull's Distribution to calculatethe safety probability its degree of confidence is 90%.

The results of reliability analysis are safety probability(reliability) P_R, intermediate probability P_M and failure probability P_F of the system, which compose so-called reliability vector of the system,where R+M+F=1. The Generalized reliability theory that we put forward in the middle of 80's had resolved the problem of component and structure with intermediate state.

By means of the experiential value of logarithmic fatigue life standard error,the safety fatigue life of welded joints was obtained at different safety probability with certain confidence level.

The index system and calculalion methad for evaluating safety probability of mechanical products are given by using fuzzy theory and power theory on basis of investigation and statistics.

In this paper, the relation criterion of the difference that it is not beyond special value of the natural frequency and driving frequency is concerned. The reliability mode and the safety probability of the random systems are defined as series mode, and the frequency reliability analysis method for avoiding the resonant is presented. The quasi failure analysis method for resonant problem of the random structures is quested by using the random perturbation technique and the reliability theory.

In this paper, the criterion is used that the difference between the natural frequency and driving frequency should be less than a specific value. The reliability mode and the safety probability of the random axial vibration systems of rods are defined as a series mode, and the frequency reliability analysis method for avoiding the resonanse is proposed. The quasi-failure analysis method for resonant problem of the random axial vibration systems of rods is studied.

Analog simulation of a fire safety probability model for high-rise buildings

In this paper, we discuss the statistics analysis for concrete test, which is doneforbuliding the road bridge on yellow river; using Weibull's Distribution to calculatethe safety probability its degree of confidence is 90%.

Intrinsical safety of products is the important guarantee of improving labour conditions and raising safety standards of human society. Safey evaluation of products is the main besis for judging intrinsical safety of products. The index system and calculalion methad for evaluating safety probability of mechanical products are given by using fuzzy theory and power theory on basis of investigation and statistics.

Reinforced concrete is a very complex material in structural construction.Even the concrete strength will increase in early time,with the time change this strength usually decreases.Also the steel strength in reinforced concrete will decrease with time variation.However,for a long [FK(W32。40ZQ]time the time_dependent property of construction materials has not been considered importantly in design and research of structure engineering.In this paper the time_dependent resistance models on concrete and steel...

Reinforced concrete is a very complex material in structural construction.Even the concrete strength will increase in early time,with the time change this strength usually decreases.Also the steel strength in reinforced concrete will decrease with time variation.However,for a long [FK(W32。40ZQ]time the time_dependent property of construction materials has not been considered importantly in design and research of structure engineering.In this paper the time_dependent resistance models on concrete and steel decrease strengths are introduced.If the initial strength of concrete increased can be neglected,the time_dependent strength of concrete and steel in reinforced concrete can be composed by means of a time variable function and the initial strength. The probability characteristic of earthquake occurrence should be considered for analyzing aseismic structure.In a certain period the time,space,number and intensity of earthquake are all random variables.The general method for evaluating earthquake effect is an analysis procedure of earthquake risk.The safety probability of structure under the earthquake effect can be expressed by a probability integral.The integral functions are composed by the failure condition probability of structure and probability density function of maximum earthquake parameter. Structural dynamic response of earthquake effect actually is a non_stationary stochastic process,which can be simplified as a stationary process.Under this assumption the vibration equation of multi_degree freedom structure can be analyzed by the mode superposition method.Usually,the earthquake acceleration expressed by the time function and a stationary process should be considered in random dynamic response of earthquake acting on construction structures. To insure “no failure under small earthquake effect",the capacity of aseismic structure within the elastic region is studied,and first passage failure model is applied.If the passage event meets the Poisson assumption then the reliability integral can be expressed simply. It is significant for the analysis of criterion,mechanics and index of failure in structural reliability evaluation. In this paper two typical failure criteria are proposed: one is random time dependent strength criterion,and the other is time dependent deformation criterion.Both failure criteria can be used as the boundary of reliability analysis in construction structures.The whole reliability of time_dependent structure is also studied in this paper. Finally,an engineering structure example is given.The time dependent reliability is computed and the results show that if the action time of earthquake is short,then the maximum shears between layers of the structure are used as load response.The shear resistance of the structure appears obviously decreased with the time change.In this example several different kinds of boundaries are given by computing the time_dependent reliability. The method and theory introduced in this paper give a practical way to evaluate the reliability depending on the time variation.