Advanced Materials Research Vols. 446-449

Abstract: It established Multi-Support excitations time history analysis model Based on large quality method. It took large span reticulated shell for example, chose EL-centro wave to carry on the spectrum analysis and time history analysis with direct integral method, studied the deformation capacity and destruction features of structure under rare earthquake of magnitude of 8, and put forward the seismic performance’s related measures and suggestions in elasto-plastic analysis of the large span reticulated shell under multi-support excitations for the actual engineering reference in design.

Abstract: It’s a technical problem of underground mining safety to determine the water conductivity height in coal roof induced by mining under the condition of fully mechanized caving. With a number of mining engineering cases, we studied complex fault zone overlying rock mass damage characteristics under the compound effect of many mining area. The results show that overlying strata deformation and failure is the results of accumulation in mining of each mining area. Therefore, whether the overlying strata water inrush in mining process will happen or not, needs to take account of water in overlying strata in old mining area. Based on the change characteristics of water conductivity height induced by mining in seven mining areas, we built regression forecasting model, and achieved the prediction of water conductivity height induced by mining in lower coal seam, so as to provide a basis for decision-making for the safety of follow-up exploration.

Abstract: The softening curves of four groups specimens with different sizes were obtained by inverse analysis based on the fictitious crack model（FCM）and the P-CMOD curve achieved by a three-point bending notched beam (TPB) test. According to the softening curves obtained by inverse analysis, size effect of softening curves was investigated，which shows both the tail of calculated softening curve, namely the maximum crack width w_c and fracture energy G_F have an increasing trend with the increase of the specimen size, but no longer to increase when the specimen size attains to a certain level.

Abstract: This paper aims to develop a numerical model to predict the in-plane load-deflection behavior and the maximum load carrying capacity of concrete-filled circular FRP arch tube (CFFAT) which to date has rarely been investigated. The present model employs the well known fiber element approach to consider the material behavior of concrete core and external FRP tube. The composite arch was idealized as an assembly of stepwise two dimensional (2D) straight prismatic beam-column elements. The established FE model was then implemented into Opensees software framework to obtain the load-deflection characteristics up to the limit strength state of CFFAT under monotonic loading. Comparisons between the present numerical predictions and experimental results reported elsewhere were made concerning the load carrying capacity as well as the ultimate failure modes. The proposed analytical model was shown to provide, with sufficient accuracy for practical use, the estimates of nonlinear static behaviour of CFFAT.

Abstract: In order to investigate the effect of coastal saline soil which modified by KD curing agent as the highway roadbed filler, a series of triaxial tests were conducted in the indoor. the law of the strength, dynamic characteristics and stress - strain relations against vibration frequency changing with dynamic load on modified soil were studied. Based on the experimental results, the morphology and mechanical properties of modified soil will not be affected under the dynamic load of earthquake and traffic. It can be showed a good correlation between the de-struction of plastic deformation and the classical power law model. The ratio that dynamic strength number di-vided by static strength number of modified soil is less than the ordinary clay under the same conditions. It can be concluded that the modified soil has good strength and durability, and it suitable for a safe and reliable highway roadbed filler.

Abstract: A new method based on material properties instead of experimental data was proposed to assess the ductility of concrete-filled steel box columns with binding bars and those without binding bars. Comparison between ductility coefficients based on experimental data and the calculated values by the proposed method shows good agreement.

Abstract: In this paper, a comparative investigation into the behavior of concrete-filled steel tube column and reinforced concrete column with the same quantity of material and cross-section sizes under axial load have been undertaken using the finite element method. Both is analyzed to compare the axial compression performance,including bearing capacity, ductility and their mechanism. The results of the analyses clearly exhibit that bearing capacity of concrete-filled steel tube column is higher about 25% than that of reinforced concrete column. Under the same conditions, ductility of concrete-filled steel tube column is better than reinforced concrete column, its application is recommended in construction practice.

Abstract: The paper is special for wooden structure housing in villages and towns, and taken appropriate reinforced measures to achieve the standard of seismic design of no collapse in big or medium earthquakes. The 1/2 scale model that loaded horizontally on the shaking table was designed to observe its damage characteristics and make an analysis of its destruction. And the effectiveness of the reinforced method will be assessed.

Abstract: In allusion to research status that structure stability performance of Self-balanced prestressed latticed shell assembled with elements is not explicit, using the finite element analysis method study structure stability to a large span latticed shell. The eigenvalue buckling analysis of latticed shell use Block-Lanczos method, and nonlinear analysis adopt consistent mode imperfection method. Through the contrast analysis from buckling load, buckling modes, degree of prestress, different initial disfigurement in latticed shell structure, obtaining the disciplines that structure stability properties of the large span prestressed latticed shell, related conclusions to the engineering design of new latticed shell are instructive.

Abstract: The stability bearing capacity of cold-formed lipped channel columns under axial compression is presented. It is shown that DSM is valid for prediction the stability capacity of cold-formed lipped channel columns under axial compression. The results calculated by suggested method agree quite well with the effective width method in Technical code of cold-formed thin-wall steel structures (GB50018-2002) and the test results are safe.