Yuan Ming Dou

Experimental Study on the Dynamic Compressive Mechanical Properties of Concrete

Dynamic compressive tests of plain concrete specimens (C30 and C40) are carried out on MTS, with the uniaxial strain rate ranging from 10-5/s to 10-2/s. The impacts of strain rates on concrete strength are studied systematically. The mechanical properties of compressive strength, elastic modulus and compressive stress-strain curve of concrete under different stain rates are also analyzed. The experiental relationships between strain rate and compressive strength of concrete are established. It is found that the compressive strength of concrete increases with the strain rate increasing. Modulus is also showing a growth trend, but the growth rate varies greatly; and the stress-strain curve under dynamic loads is similar to the one under static loads. These research achievements can provide us with a more accurate grasp of concrete actual working conditions and provide some guidance to structural design of concrete. These are important to build the dynamic damage constitutive models, too.

Full-Size Seismic Experiment Analysis on the Timber Structure in Rural Areas

Timber structure seismic analysis is an important problem in structure design and safety of building. In this paper, full-size pseudo-static tests of two single-storey and single bay timber frame with and without infilled wall were carried out. Failure process, failure form and deformation capacity were investigated. The test results indicate that the timber frame has better capability of dissipation of seismic energy. The infilled wall can increase the seismic ability of the whole timber frame structure. There is a good collaborative mechanism between the infilled wall and frame under some construction measures.

Wind Tunnel Experiment on the Wind Effects of Low-Rise Buildings in Rural Areas

At the present stage, no detailed specifications and codes about wind effects on low-rise buildings in rural areas were made in Chinese. In order to reduce casualties and property loss due to wind damage, the investigation of wind tunnel experiments were carried out. The results indicate that the influence of purlin and front and rear eaves on wind load should be considered in building design. Because a specific blowing angle of wind would produce the largest wind load in the surface of the house. In the structure design, the value of shape coefficient should be increased to a certain degree and also amplify according to windward and leeward roofs.

Study on the Vehicle Load of Highway Bridge Based on Measured Data

Vehicle load is one of the most important factors to influence the structural security and applicability of the highway bridge. In this study, in order to learn the situation of the vehicle loads on expressway in recent years, and to provide the basic standard for highway bridge load, collected the dynamic data of nearly 4000 trucks through the traffic investigation of a section of 24 consecutive hours on the expressway in Hebei province. According to the actual survey results for statistical analysis and the principle of equivalent fatigue damage, the model of 5 kinds of daily operation vehicle load was deduced based on the measured data and the fatigue loading spectrum was established. The results of the survey can provide references for the design of the highway bridge fatigue load and fatigue assessment in our province in the future.

Study on Mechanical Behavior of Aerated Concrete Block Infill Wall under Out-of-Plane Action

The influence of insulation firewall on structure stiffness and the mechanical property of firewall in plane have been more mature in the academic research, but its out-of-plane mechanics is not complete at home and abroad. In this paper, static loading test of aerated concrete block filler wall was designed. Through the cracking loads, ultimate loads, failure loads and load-displacement curve of six walls, we make judgment of the impact on infill wall out-of-plane properties and failure morphology. The results indicate that the mainly failure pattern is horizontal crack and diagonal crack, the destroy position is concerned with the strength of four boundary constraints and the load capacity of infill walls can improve greatly after cracking, the height-thickness ratio is the decisive factor.

A Strategy Research on the Development of Tianjin Tuanbo New Town West District

The construction of Tuanbo New Town will be of great significance for the global layout of Tianjin. On the basis of design flow of new town’s development strategy, the whole new town will be developed successfully, respectively, from a strategic level to formulate and implement the strategy planning ; to analyze of the benefit from the operating level; from the protection level to put forward some measures and recommendations.

Study on the Mechanical Performances of the Insulation Board

The basic mechanical properties of the insulation board in external thermal insulation system are studied in this paper. According to the structure of the board, the relevant tests are designed, which includ the plate bearing capacity, the bond strength, the compressive strength and the flexural strength. The test results show that the security performance of the composite insulation board is high and bonding strength is good, compressive strength is high in the case of meeting the basic technical requirements. Besides, with the increase of the insulation board’s thickness, its flexural strength would increase.What’s more, due to the mesh effect on internal reinforcement, failure process has a certain ductility.

Dynamic Consolidation Ground Reclamation Vibration Transmission Mechanism and Impact Studies on Composite Foundation

Combined with dynamic consolidation Caofeidian area of land reclamation project examples, Vibration transmission mechanism of dynamic consolidation and reclamation of the foundation were explored, obtaining acceleration attenuation law, and studying and analyzing the impact of strong vibrating composite foundation. Research provide important theoretical basis to guide Dynamic Consolidation coastal reclamation foundation design and construction.

Application of Mine Water for Water-Source Heat Pump System

Mine water and mine return air is good for the renewable energy due to heat storage underground, and the recycling has been a new technology of the energy utilization in water source heat pump system. Utilizing the waster heat of coal mine is beneficial in reducing the coal consumption of winter heating boiler or even replacing it completely. Comprehensive analysis the research situation and the project example, this paper points out that the technical of mine water applied for water-source heat pump system is feasibility in the practical project and theory in view of advantages, like energy saving, environmental protection, high efficiency and short payback period, etc. Therefore, application of mine water for water-source heat pump system is a new advanced energy-saving technology.

The Application of Gray Theory on Predicting the Settlement of High Embankment

Stability of the road embankment is the foundation of the highway normal operation and maintenance, so there is strict requirement of road subgrade settlement for the highway. This article uses the gray theory to predict Cheng Chi high embankment construction settlement and builds a predicted model and tests the model’s accuracy. The results of settlement prediction are under the limits, so the stability of the road subgrade is good. This dynamic prediction method can be used on prediction of the settlement of high embankment and it’ll direct the operation and ensure the maintenance safety.