国内核工程双钢板-混凝土组合剪力墙的研究起步较晚,对组合剪力墙的面内受剪性能研究较少.文中通过4片中低剪跨比核工程双钢板-混凝土剪力墙试件的面内拟静力试验,研究其在恒定轴压力和面内低周水平往复荷载作用下的破坏模式、受剪承载力、变形能力、延性、刚度和耗能能力等指标,分析了距厚比、剪跨比等因素对双钢板-混凝土组合剪力墙受剪性能的影响.试验结果表明:试件的破坏模式均为剪切破坏;距厚比对组合剪力墙钢板局部屈曲和试件变形能力、延性有较大影响,但对承载力影响并不显著;剪跨比越大,组合剪力墙的受剪承载力越小,但变形能力和延性越大;试件的累积耗能随加载循环次数呈指数型增长,抗震性能良好.

In quasi-static tests for structures with multiple degrees of freedom, the forces applied to the structures commonly follow a prescribed force profile, so the loading with controlled forces becomes the natural choice. However, force control is not applicable any more when the bearing capacities of the tested structures decrease dramatically during the collapse stage. To this end, a force-displacement mixed control method is proposed to apply in quasi-static tests for structures with multiple degrees of freedom. By this method, the forces on each degrees can followed force profile and achieve the stable control of the quasi-static loading in the collapse stage. Based on the Flex-Test IIm platform of MTS Corporation, a test program called TMPTG using the mixed control algorithm is developed. Some tests are conducted and the effectiveness of the method is verified.

In quasi-static test for structures with multiple degrees of freedom system,the forces exerted on the structures commonly follow a prescribed force profile,e.g.triangular pattern;therefore,force control becomes the natural choice.However,force control are not applicable any more when the tested structure sustain significant strength degradation during the collapse stage.To this end,a force-displacement mixed control algorithm was devised to achieve the stable control of quasi-static loading using a prescribed force profile.Based on the Flex-TestⅡm platform of MTS cooperation,a test program called TMPTG using the mixed control algorithm was developed,physical tests were conducted,and the effectiveness of the algorithm was verified.

A new method to perform the finite element analysis based on limited vibration signals measured on the spot was presented.The limited vibration signals of dynamic responses of structures(antennae of China Mobile) were measured under impulsive wind loads,such as the signals of acceleration time histories and their frequency spectrua.Meanwhile,the time histories of impulsive wind loads were simulated through the equation of motion of the structures,which were then applied to the finite element model.It the light of this finite element analysis,the correction factor k between simulated wind loads and practical wind loads was obtained,and the revised wind loads was applied again to the model.The internal forces of structure were thus gained under the closer approximation of practical impulsive wind loads.It is shown that the finite element analysis can get the results in accordance with those of experiments,which provides an easy method for total process analysis of structures under impulsive wind loads.

Two dynamic centrifuge model tests of an underground structure at different depths in sandy soil are performed to investigate the seismic response behavior of the dynamic soil-structure interaction system. The tests are performed at 50 gravitational accelerations and the input motion is Kobe wave. The design of the tests is presented and some of the test results, including acceleration, earth pressure, displacement, and strain responses, are provided. The maximum bending strain of vibration occurs at the column top, indicating that the column is the most unfavorable member of the structure during the earthquake and that the column top is more disadvantageous than the column bottom. The total earth pressure increases under seismic loads and maintains at a high level after the vibration. Both the maximum earth pressure increment and maximum total earth pressure occur at the corner of the bottom plate. The comparison between the test results at two burial depths indicates that the burial depth is an important factor influencing the seismic response of an underground structure. The seismic response of the structure at the prototype burial depth of 5 m is less favorable than that of 2.5 m. The peak values of the additional bending strain responses due to earthquake at some observation positions are close for the major and the auxiliary measuring cross sections, and the shapes of the strain time history curves are similar, which indicates good integrity of the structure model under seismic loads.

Traditional supports are difficult to maintain the route work of roadway in deep well due to dynamic pressure propagation within soft rock. To tackle this problem, concrete-filled steel tube support is developed; and further the mechanical properties of the support are tested in laboratory. The experimental supports are composed by four sections of φ140 mm × 4.5 mm steel tube, with concrete C40, and joints with casing linkage. Under the conditions of lateral constraint and vertical point load pressure, the ultimate bearing capacity of experimental support is about 1504.1 kN; and the vertical ultimate compressive deformation reaches 82.65 mm, resulting in failure mode of steel tube. Compared with the U-shaped steel support, concrete-filled steel tube support holds not only high supporting capacity, but also with a competitive price. So concrete-filled steel tube structure may have an extensive application to coal mine roadway.

To study the vibration serviceability of cast-in-situ pre-stressed concrete hollow floor structures,dynamic properties of a simply supported 8 m×8 m hollow floor structure were measured.The measured fundamental frequency is 14.25 Hz and the first modal damping ratio is 0.022.Finite element analysis of the test hollow floor structure was performed.The analytical first three frequencies and modal shapes are in good agreement with the measured results.Calculation results of four pieces of simply supported hollow floor structure with span of 8-15.2 m show that the peak vibration acceleration induced by human walking is much less than the limited value of vibration serviceability requirement of the ISO standards.The hollow floor structures have excellent vibration serviceability.

The seismic response of an unconfined sandy foundation was tested on a centrifuge shaking table which was also used to test the effects of a border and a laminar model box.The dynamic centrifuge tests of the unconfined sandy foundation had a Kobe wave input motion with gravitational accelerations of 50 g.The paper provides partial test results including accelerations and displacements of the sandy foundation.The results indicate that the laminar model box avoids the disadvantages of the boundary effect and can accurately simulate the shear deformation of the unconfined field.The test equipment,measuring instruments,and data collection system all performed well,so the system provides a good base for future tests.

The sensor positions and measurement data in a dynamic centrifuge model test were optimized for a soil-structure interaction testing system. The seismic response analysis used a static elasto-plastic analysis method for underground structures. An equivalent static seismic loading by horizontal inertial acceleration of the soil layers replaced the dynamic seismic loading in the method. The results indicate that ends of the structural members bear relatively larger soil pressure and internal forces, so the positions should be key observation points. The observation transects and sensor positions and amounts of sensors were then optimized.

Similitude design of a model test concerns the size and materials of the model in prophase of a test and also concerns the management of data after the test, so it is very important for shaking tests. Similitude design of the dynamic soil-structure interaction test on shaking table system for geotechnical centrifuge is carried out by means of dimension analytical method, which is based on theorem of Bockingham. During the similitude design, the most important factor is that the test should simulate the soil-structure interaction of the prototype well. So the control term of similitude design is that the relative stiffness between soil and structure should be consistent with the prototype. In addition, physical properties of model materials, the difficulty of making model, the influence of the boundary of model box, the capacity of equipments and the appropriate similitude design plan are taken into consideration. Then the size and materials of the model are decided. The optimization of similitude design plans will exert influence on the process of the test deeply and the results of the paper may supply references to the model design of similar tests on shaking table system for geotechnical centrifuge.

Numerical study is carried out for the solution to problems of boundary effect of laminar model box for dynamic centrifuge model test.Seismic responses of single layer soil and layered soil in laminar model box are simulated respectively and the numerical solutions are compared with the exact solutions.Finally boundary effect of laminar model box is analyzed combining with the numerical simulation results and the test results. Both show that the peak accelerations,the shapes of acceleration time history and the Fourier amplitude spectra are in good agreement.The results indicate the laminar model box avoids the disadvantages of the boundary effect and can simulate the real seismic response of free field well.So the paper verifies the validity of the simulation design of soil boundary effect by laminar model box,which provides a basis for dynamic centrifuge model test for soil-underground structure interaction system.

Two shaking table tests,with a scaling factor of 1/10,for the seismic response of rigid pile composite foundation-structure systems were carried out to investigate the similitude realization issues,which include the design of the soil container to better simulate the shaking deformation of the soil,the measure to reduce the influence of non-similarity of the gravity field,and the adjustment of the damping ratio of the model structure to make it close to reality.Flexible container was employed.Pulling cables were used to apply downward force on the foundation to make the pressure underneath satisfy the similitude condition,and dampers were mounted on the structure model to adjust its damping ratio.Effects of the above measures were carefully examined by comparative analyses of the test results.It is proved that the flexible container could adequately simulate free field boundary conditions in the soil,that the approach to simulating the pressure underneath the foundation was satisfactory,and that the dampers mounted to the model structure could simulate the damping property of actual building structures effectively without any significant side effect.

The hammer impulse-stimulating measurement of a CNP1000 Reactor containment 1:10 model is used to determine the model's dynamic characteristics.The finite element analysis model of the structure is built by ANSYS.By contrast,the results are closed to each other.The first two mode shapes of the structure are vibration along two perpendicularly axes,the third is the torsional mode shape and the fourthly to ninthly are partial vibration of the barrel.The results contribute to realize the reactor containment's dynamic characteristics.

To deal with the properties of early age concrete while allowing for the influence of curing temperature on the strength development rate and on ultimate mechanical behavior of concrete, the concept of “aging degree” is introduced. Using a mass concrete soleplate as an example, the thermal stress calculations in early age concrete with aging degree method are discussed using Finite Element method. To implement the aging degree method in finite element analysis, each element of the model must have different material properties that change at every load step, which is fulfilled in the analysis and the reason for no cracks in the mass concrete soleplate is explained.

Based on the modal analysis theory and the requirements of the codes, some research work about the dynamic behavior of 600MW turbine-dynamotor frame foundation 1∶10 model in a powerstation was done . More practical dynamic character values were obtained from factual data by 3D modal analysis of white noise random excitation method. The feasibility of theoretic analysis model is proved by the comparison with computational results of ANSYS. The research results will afford reference to developing the design principle and optimized dynamic design method of turbine-dynamotorframe foundation.

A kind of constructional column-beam system of masonry structure is presented,which makes the columns playing initiative role adequately and can improve the collapse performance of composite wall during a building standing for load by reducing the distance of column-beam.The calculated results by finite element method indicated that the stiffness and bearing capacity of the system are improved a lot to the old one of masonry structure, and this structure system will have a good future if applied to large-bay residence structure.

In this paper, the design and the seismic experimental results of a full scale 6-storey building constructed of porous brick and small-size hollow concrete block structure with column-beams are presented. The test results are analyzed and the seismic bearing capacity of this type of building is evaluated. According to the results, some conclusions and further recommendations for design are proposed.

In this paper, the design and the antiseismic experimental results of a full scale building of 6 story porous brick and small size hollow concrete block structure with constructional column-beam are presented. The test results are analyzed and the seismic bearing capacity of this type of building is evaluated. According to the results , some conclusion and further recommendations for design are proposed .