Advanced Materials Research Vols. 250-253

Abstract: Numerical simulation for the progressive collapse of the underground structure under its internal blast load has been reported in this paper. The three dimensional model of the underground structure with two-story and two-spans in both x-direction and z-direction covered with soil was built with explicit dynamic analytical software LS-DYNA. An improved method by considering the impact of the blast load was proposed in the simulation. Solid-fluid interaction algorithm, the erosion algorithm and stress initialization are used in the simulation. It is found that, compared with the alternative path method, the improved method gives more accurate predictions of the progressive collapse process. The improved direct simulation method is more cost-effective than the direct simulation method. The impact of the internal explosion can’t be ignored. The analysis may provide important information for the additional design guidance on progressive collapse of underground structures.

Abstract: Snaked-lay pipeline is an effective method for control lateral buckling of pipeline, which is used widely. For design of snaked-lay pipeline the key is how to control lateral buckling of pipeline, namely, the lateral buckling is triggered at the designed location, the moment and strain of post buckling are acceptable. A new shape of snaked-lay pipeline is presented. Based on ANSYS, nonlinear finite element of pipeline is built. Comparisons show that the critical buckling load, moment and strain of post-buckling are all reduced for the new shape of snaked-lay pipeline.

Abstract: In this paper the direct constraint model is adopt to solve the penetration problem of traditional Goodman element. A method to determine the nonlinear friction coefficient of contact surface between the face slab and cushion of CFRD is proposed. The CFRD of a pumped storage power station is studied using traditional method and method proposed in this paper. Analysis results show that the method proposed in this paper to simulate the contact problem of CFRD is reasonable and more superior to traditional methods.

Abstract: Based on the current situation that the regulatory detailed planning is being adjusted frequently in most cities in China, the contents and problems of the regulatory detailed planning are summarized. Later on, the causes and disadvantages of the regulatory detailed planning alteration are analyzed as well, in terms of urban planning formation, the interests of developers, urban planning management, and etc. In the end, the countermeasures and advice which can promote the effective implementation of urban planning are put forward.

Abstract: According to risk analysis theory, a model of analysis for failure risk of upstream revetment of existing levees is proposed in this paper. Based on the model, the load effect and generalized resistance for the failure risk of upstream revetment of existing levees are analyzed, and then the influencing factors of the failure risk of upstream revetment are studied. The calculation results show that the proposed model is workable and effective for analysis of the failure risk of upstream revetment of existing levees, and the main factors influencing failure risk of existing upstream revetment are the randomness of the existing effective thickness of upstream revetment and ratio mean of upstream slope of the existing levees.

Abstract: This paper discusses stabilizing treatment of runoff time series by empirical mode decomposition (EMD), and periodic analysis of stabilized runoff time series by maximum entropy spectrum, and presents high-resolution character of maximum entropy spectrum and its application prospect in hydrology. It conducts the analysis and calculation in combination with a real example of annual runoff series at the Lanzhou station in the upper of Yellow River, and study proves that annual runoff has 11.1, 6.25 and 3.1 years significant periods at the Lanzhou station. The conclusion illustrates the feasibility of this method and provides scientific data for water resources planning and managing.

Abstract: This paper elaborated that the real estate develops the whole-process to surveying and mapping the work contents, method and requests in applied everything generally, inquiring in to surveying and mapping the regulation and the key problem in the process, brief introduction the interface is friendly and operates the simple real estate development to surveying and mapping the information management system, pointing out to surveying and mapping the phenomenon that the information waste and the increment real estates develop the cost, announcing to public to surveying and mapping the system reform and surveying and mapping the necessity that the market develops completely, developing for the real estate or supervision company contain certain leading and practical values.

Abstract: Prestressed steel reinforced concrete structure, compared with other concrete structure has its unique advantages. So it is mainly used in large span and conversion layers. With the popularization of this structure,more attention should be payed on fire resistance performance. On the basis of reasonable assume,two steps model is used as concrete high strength calculation model. Simplified intensity decreased curve is used as rebar,steel and prestressed. Two ultimate bearing capacity formulas of prestressed steel reinforced concrete beam are established. One is for the beam whose tensile area is under fire, the other is for the beam whose compression area is under fire. Prestressed steel reinforced concrete structure has both prestressed concrete structure’s advantages and steel reinforced concrete structure ’s advantage. Steel reinforced concrete is used to improve the bearing capacity of the structure. Prestressed steel is used to improve the ultimate state of structure’s performance during normal use. Thereby structure’s performance is better to play. There are many similarities between prestressed steel reinforced concrete structure and steel reinforced concrete structure about fire resistance performance. Because of prestressed steel reinforced concrete structure’s own characteristics, there are still many problems about fire resistance. This paper mainly presented bending terminal bearing capacity of prestressed steel reinforced concrete beam under fire. Established simplified formulae for calculation, it is meet the engineering accuracy requirement.

Abstract: For improving water scenery of Quanzhou city to form a good-looking artificial lake, a barrier is planned to be built in the Jinjiang estuary to store up water from runoff and tide. Some water problems dealing with the barrier construction in the lower reach of the Jingjiang River, such as city flood control and draining waterlogging, water quality, ship passing, and so on, also are concerned by many aspects of whole society. Detail research on these problems for providing a basis of design and operation of the barrier was performed in Nanjing Hydraulic Research Institute according to a physical model test. The result shows that there is a small impact to flood running, and disadvantageous impact to water quality can be reduced to minimal extent by reasonable operation manner of the barrier.

Abstract: Since the terrorist attacks have increased over the world in recent years, blast-resistant protection of building structures has received considerable attention. The rigid and flexible composite protection layer as a new protection measure was examined through the method of experimental tests in this paper. Two sealed steel boxes were selected for the testing, one with the rigid and flexible composite layer, while the other without any protection. The rubber was selected as the flexible material while the steel plate is selected as the rigid material. The effectiveness of the composite layer under different explosive loadings was investigated. By comparing the structural strains, the experimental results show that the rigid and flexible layer can suppress the structural dynamic response obviously, and the blast-resistant effect of the composite layer will be increased further with increase of explosive charge.