Applied Mechanics and Materials Vols. 368-370

Abstract: Based on the coulomb's earth pressure theory hypothesis, considering the condition of static equilibrium of the force when the slide wedge was in limited equilibrium, a formula of active earth pressure was proposed, which considers the cohesion force on the sliding plane, the adhesive force on the interface of soil and the retaining wall ,the local uniform load, and the given critical rupture angle of the explicit solutions. The contrastive analysis with calculation results based on code primarily proves the rationality of this formula .It is analyzed that , the active earth pressure acting upon the retaining wall and the critical rupture angle of sliding wedge will enlarge with the increasing of local uniform load width.

Abstract: Experimental verification of structural members can be the necessary part of the structural design of load-carrying civil structures, mainly in the period of last two decades. In some cases, the knowledge obtained from the tests is the sole source of the reliable information about actual behaviour of structural member in strain and failure process and about its objective load-carrying capacity. The paper is specifically aimed at the control experimental verification of roof decking based on thin-walled metal profiled sheets. Loading test has been performed during structure erection, as additional resource for the verification of actual behaviour and objective load-carrying capacity and for the confirmation or refinement of static design assumptions and results, within the ultimate and serviceability limit states. The subject of the control experimental verification was roof decking composed of thin-walled metal cassettes with thermal insulation at its upper side, used for the university lecture room roofing.

Abstract: The width of the top of the wall LIANGZHU ancient city , which is called the first city in China reaches 40-60m. The sapping depth made by around environment such as wind and sand is increasing years by years. So the problem of stability of wide top ancient wall has been put forward. Under different sapping depths in ancient city wall, using finite difference soft FLAC3D, We can build calculation model to study the failure laws and mechanism of the ancient city wall under different sapping depths. The research shows that when the sapping depth is not enough large, the whole city wall is stable and local plastic failure occurs around the sapping place. With the depth of sopping increasing, the plastic failure area is becoming bigger and bigger and reaches much deeper into the wall, even reaches the top of the wall, and the soil displacement becomes larger and larger until the whole wall sliding. The sapping contributes to the damage of the wall, the potential slide opening appears in the sapping area, and in the wall through plastic area appears, leading to the whole wall sliding.

Abstract: This paper describes the test of six reinforced concrete (R.C.) beams strengthened by epoxy-bonded plate under the opposite side loading condition and the ordinary condition. The data of the developing crack, and the deflection of beams are experimentally obtained. At the same time, the maximum crack width and the deflection are calculated through theoretical analysis. It analyzes the deflection and the crack developing fact of Strengthened beam on the two different conditions and draws a conclusion that R.C. beam of opposite side loading Strengthened by Epoxy-0bonded plate condition have many advantages, such as improving the stiffness and lessoning the crack width and so on. It shows that this method can get a satisfied strengthening effect.

Abstract: The template system, the mould of fresh concrete, plays an important role in the concrete structure construction. At present, in the process of steel template concreting in axis rotating structures, the template system adopts the traditional construction technology of formwork with scaffolding; thus, the template can not withstand the loop force, hence difficult construction and safety hazards. Aimed at the deficiencies in template system design, a new kind of steel template that can bear loop force has been designed with the software ANSYS. Taking a rotating structure as an example, this paper, based on the stress test of the structure, has analyzed the distribution and change of the stress under the steel template construction. The results show that the design of the template is reasonable and that it is also applicable to similar structures.

Abstract: Based on the vehicle-track coupling dynamics, by means of finite element method, the vehicle-double-block ballastless track-subgrade vertically coupled model is established to research the dynamic properties of double-block ballastless track with unequal sleeper spacings under the excitation of either long wave irregularity or short wave irregularity. The results indicate that the difference between the sleeper spacing and the standard sleeper spacing of the double-block track within the range of 70mm will not effectively affect the vehicle operation. The unequal sleeper spacing has a certain influence on the vertical displacement and acceleration of vehicle, rail and wheel rail force, but its influence on the force properties of track structure and vehicle operation stability can be ignored.

Abstract: In order to get the performance of a super high-risebuilding under severe earthquake actions, a fiber-based computational model ofthis structure is established in PERFORM-3D, and both Static Elastoplastic Analysis and Elastoplastic Time-history Analysis are used to evaluate theseismic behavior of this structure. Inter-story drifts at the Performance Point obtained by Static Push-over Analysis are allsmaller than that specified in codes. And results of Elastoplastic Time-historyAnalysis show that structural displacements, shear capacity and flexuralcapacity of some key members all meet the specified performance targets. Thenthis structure is safe.

Abstract: In order to acquire mechanic performance of tension-chord Beam structure and the interaction between column and soil for canopy structure, combined with its own particularity pipe-soil ANSYS nonlinear analysis was carried out by using DP model, and from buried depth of pipe variation law of deformation, shear stress and equivalent stress for surrounding soil was investigated. The results show that the vertical stress is the bigger than horizontal stress and local stress of soil under pipe is larger, so this phenomenon is regarded as the stress concentration. Flexible connecting of column bottom can realize movement and recombination of structure, and pipe-soil radius and construction measures can provide safe and reliable reference for design and construction of mobile greenhouse structure.

Abstract: In order to improve the lateral deformation capacity of the high strength concrete shear wall, partially confined end-zones are usually set in the both ends of the shear wall cross-section. According to the experimental results of 15 high strength concrete shear walls with flexural (flexural-shear) failure, the moment - curvature skeleton curve of this shear wall cross-section is simplified as four linear through cracking point, yield point, peak point and ultimate point. Based on the plane-section assumption, the bending moment and curvature expressions at cracking, yield, peak and ultimate state are derived. At the same time, the effect of partially confined end-zones on peak and ultimate moment-curvature are taken into account. The analysis results show that, the calculated values are in good consistent with the experimental data.

Abstract: Combined with practical experience a kind of new horizontal storage tank with separate plate was put forward. In view of the lack of experience in the design of the new tank and limitations of carrying out shaking table test for full scale horizontal storage tank, the pseudo-dynamic analysis of separate plate substructure with 5m diameter is done by using ANSYS finite element software combined with the actual engineering. The fluid loads action and mechanical model were simplified, and elastic-plastic mechanical properties of separate plate substructure under the cyclic loading actions were investigated, then deformation and stress distribution of separate plate were obtained. The design thickness for separate plate which in the horizontal storage tank is verified by finite element analysis and the horizontal tank construction methods is given. These can provide technical support to improve the practical design of large horizontal storage tank.