Ying Min Li

Study on Constructional Reinforcement for the Foundation of Blast Furnace due to Temperature Effect

Based on the test and numerical analysis, the paper studied the constructional reinforcement of blast furnace foundation under the influence of concrete hydration and top temperature. The results indicate that constructional reinforcement should be thinner and have a small spacing. Stress concentration always appears around the corner and constraints of blast furnace foundation, where should be strengthened with constructional reinforcements. In order to prevent cracks caused by internal tensile stress during concrete hardening, it is necessary to place temperature reinforcement inside the foundation. Temperature effect should be considered at the circular area on top of blast furnace foundation and should be strengthened with constructional reinforcements.

Study on Ground Motion Parameters of Seismic Appraisal for Existing Structures Based on Residual Service Life

Research status of ground motion parameters of seismic appraisal for existing structures is analyzed. According to the theory of the probabilistic distribution of seismic intensity which fits Extreme Value Type Ш, the relation of multi-value seismic intensity to seismic basic intensity from different seismic hazard characteristic zone is studied in this paper. Under the principle of all the seismic actions of each fortification level have the same exceeding probability, the basic intensity for seismic assessment of buildings with different residual service lives is given to each zone. At last, after giving full consideration to the seismic hazard differences to different areas, the modification factors of seismic action of buildings at the three zones with different seismic hazard characters are given in this paper. At last, this paper provides a base for the structure designers to choose a rational seismic action during the seismic appraisal for existing structures.

Numerical Simulation of Temperature Effect of Concrete Hydration

Based on the improved equation of concrete heat-generation rate and an improved calculation method of temperature stress, the temperature effect of concrete hydration heat is simulated successfully in ANSYS. Comparison between the numerical simulation results and test results of a scaled model of blast furnace foundation indicates that the calculated temperature field based on the improved equation and method is much closer to that of test than which obtained by the old equation and method. By using the stress superposition principle, the temperature-stress field can be calculated with considering the change of material behavior with temperature and time.

Seismic Performance Analysis on Single-Storey Masonry House with Sliding Damping Technology

This paper presents a technology of sliding damping which could resist ground frost heaving. In the technology, setting the low-grade mortar bond of the upper and lower ring beams to achieve slip shock absorption, and setting the rubber beams to achieve shear deformation limiting. By rubber beam shear performance test, the shear strength of the rubber beam has been acquired. In the paper, the finite element software has been adopted to simulate the seismic performances of common wall and sliding damping wall structures under low cyclic reversed loading, the hysteretic curves between the bottom shear and the top displacement of the walls. The research results show that sliding damping ring beam has the very good function on dissipating seismic energy and reducing seismic action.

Novel Partitioned Integration Method Based on Newmark's Scheme for Structural Dynamic Problems

Systems of ODEs arising from transient structural dynamics generally exhibit high-frequency/low-frequency and linear/nonlinear behaviours of subsets of state variables. This paper resorts to the use of different time integrators with different time steps for subsystems, to tailor each method and its time step to the solution behaviour of the corresponding subsystem. Anovel partitioned integration method with the acceleration continuity is proposed whose velocity continuity is also ensured by means of the mass projection strategy. Both its stability and accuracy properties are examined through numerical analysis on Single-DoF split mass system.

Analysis and Experimental Study on Mechanical Performance of the Extruded Forming Channel Type Embedded Part

A kind of channel type embedded part which has been disposed through extrusion forming new technology needed to extensive apply in engineering. Theoretical analysis and experimental research have been carried out on shear properties of bolt and one-way static pull-out performance of channel. Got the ultimate bearing capacity, deformation and failure mode, compared the results between test and finite element analysis, fit a formula for calculating the bearing capacity of channel. Experimental result shows that embedded parts working performance is good. It has higher strength than work load and the expected ultimate load according to the theoretical calculation. Meantime, specimens has relatively good ductility before failure. The test results have provided the experimental basis for the application of embedded parts in engineering.

Experimental Study on Tensile and Shear Behaviors of the Channel Type Embedded Parts in Concrete Beam

With the development of curtain wall in super high-rise buildings which promoting the application of embedded part. In this paper, the experimental research on the tensile, shear properties of a kind of channel type embedded part which has been disposed through a hot extrusion forming new technology. The mechanical properties, deformation and damage form of embedded parts were investigated.Experimental results indicate that it has good mechanical properties and favorable deformation performance under tensile and shear loads in normal work. Under effect of tension, the circular anchor nail was pulled-off from channel and the bottom junction between square anchor nail and channel was tore were the main failure forms. Otherwise, when under the effect of shear, the bolts were sheared fracture. The results of experiment could provide experimental basis for channel embedded part with wide application in engineering.

Relief Effort and Reconstruction after Wenchuan Ms8.0 Earthquake

Wenchuan earthquake of May 12, 2008 in Sichuan province is most destructive, the most widely spread, the most difficultly to disaster relief in recent decades in China. The earthquake relief and reconstruction work is also the fastest, to mobilize the widest range of input power in an action, creating a miracle of the worlds earthquake relief and reconstruction. Those successful practices provided a valuable experience reference to other areas for fight against natural disasters and rebuild their homes. This article describes the damage of housing, roads, bridges and other engineering structures and landslides mudslides, dammed lakes and other geological hazards triggered by earthquakes; Outlines the effort of the rescue operation, including personnel search and rescue, road rehabilitation, caring for the wounded, people placement and soon; Summarizes the reconstruction strategies and policies, including with Chinese characteristics” counterpart support” reconstruction mode which means a province to help a county. In the end, the article discusses the earthquake relief and reconstruction experience and inspiration.

Study on the Seismic Performance of Shear Wall Structure with Unidirectional Wall Frames Based on Pushover Analysis

In the paper, the equation of stiff characteristic coefficient of shear wall structure with unidirectional wall frames was derived, the deformation characteristics of structure with different wall frames ratio and height were analyzed. Through pushover analysis, the seismic performance of structures were evaluated by interlayer displacement angle and plastic hinge development process. Under earthquake action, increase of wall frames ratio will make plastic deformation increase and maximum interlayer displacement floor move down.The bottom of structure is the weak region, the short wall limbs of wall frames are the weak structural vertical members. The research results show that the wall frames bring adverse effects on the structural seismic performance, so the different design meathods should be carried out according to the overturning moment proportion of wall frames.

Seismic Analysis of an Intake Tunnel of Different Tunnellining Programs for a Nuclear Power Plant

Developing an analysis program and simulating the radiation damping effect in the infinite foundation and inputs ground motion rationally. The static and dynamic analysis of an intake tunnel for a nuclear power plant is performed with ANSYS based on some 2-D finite element models considering of structure-foundation interaction by Time-History Analysis. Aiming at different programs of two linings in tunnel, the stress and internal force distribution of the tunnel , the wall rocks and the lining is researched and analyzed, and the diagram of stress and internal force is drawn. The regularity obtained can provide the basis for the seismic response analysis and design of tunnels.