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Zheng Y.,LiaoNing Building Materials Science Institute | Zheng Y.,Dalian University of Technology | Li L.,LiaoNing Building Materials Science Institute | Li L.,Wuhan University of Technology | And 5 more authors.
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | Year: 2011

Freeze-thaw tests were made for six kinds of the new wall materials and clay brick, and the number of freeze-thaw cycles is 0, 25, 50 and 75. By studying relationship of rate of mass loss and cycle numbers or rate of strength loss and cycle numbers, calculating damaging model of new-type walling materials was found based on time-depending reliability under action of freeze-thaw cycle. The result shows that time-depending reliability index of concrete solid brick in freeze-thaw cycles is gradually changing smaller, with time going by, and changing tendency is parabola. Using the model, the freeze-thaw cycle life of the new type wall materials can be predicted, which supplies basis of freeze-thaw damaging calculation for the new-type wall materials, and reduces risk.


Li L.,Wuhan University of Technology | Li L.,Shenyang Jianzhu University | Li L.,LiaoNing Building Materials Science Institute | Jiang H.,Wuhan University of Technology | And 4 more authors.
Advanced Materials Research | Year: 2011

The paper gives efficient algorithm of engineering structural reliability and its source program in Matlab with example. The paper introduces Mento-Carlo method, and stable reliability formula of slag concrete brick under compressed is established. And combined with data of experiment, it is given that its source program in Matlab. Matlab supplies many kinds of operation of matrix, and includes some toolboxes for the calculation of reliability, and it is very efficiency and convenience to make program of Matlab for the reliability calculation, which is easy to be grasped for the engineers. So its applying research on the reliability calculation will push forward the theory and application of structural reliability theory. © (2011) Trans Tech Publications.


Li L.,Wuhan University of Technology | Li L.,Shenyang Jianzhu University | Li L.,LiaoNing Building Materials Science Institute | Jiang H.,Wuhan University of Technology | And 4 more authors.
Advanced Materials Research | Year: 2011

Algorithm of most optimization calculation is favor for the most technology personnel, for its result is ideal and it doesn't need derivative of performance function. Combined with theory of nonlinear programming and method of optimization calculation for structural reliability, the program calculation is written by means of Lingo, including system reliability calculation. With the example, the results prove the method was accurate and fast. It was very efficiency and convenience and objection to make program of Lingo for the reliability calculation, which is grasped for the engineers. So its applying research would push forward application of structural reliability theory and optimization design in structural engineering. © (2011) Trans Tech Publications.


Li L.,Wuhan University of Technology | Li L.,Shenyang Jianzhu University | Li L.,LiaoNing Building Materials Science Institute | Jiang H.,Wuhan University of Technology | And 4 more authors.
Advanced Materials Research | Year: 2011

CFRP(Carbon Fiber Reinforced Plastics) reinforced structure, as one kind of new technology, has been applied extensively in concrete structure, and CFRP reinforced masonry structure has been began studying and applied. But reliability research of masonry strengthened with CFRP is less, which restrains applying of CFRP. In the paper, Combined with the theory of reliability and tests, supposed that it is basic random variable that strength of brick and mortar and geometry dimension of members and effect of load, it is established that the stability probabilistic formula of brick column reinforced by CFRP under axial-loading. Its reliability is calculated, by means of Matlab. Under the action of different loads and total loads being constant, it is analyzed that the relationship of index of reliability and ratio of loading effect. Some useful results are gotten. And the result calculated is reasonable and reliable and it may supply engineering personnel with computer basis. © (2011) Trans Tech Publications.

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