Shi Ming Liu

Simulation Analysis on Construction Control of Low Tower Cable-Stayed Bridge

To ensure the construction quality, safety and reliability, according the design drawings, construction process and the related design code, this paper establishes the simulation model by the software of MIDAS/CIVIL for the analysis of construction control of the low tower cable-stayed bridge. The calculation results showed that the maximum cumulative horizontal displacement of the tower and vertical displacement of the beam is 13.8mm and 154mm respectively, which can be adjusted by setting camber. At completion state of the cable-stayed bridge, the stresses of the tower and the beam are both in compressive with the maximum of 14.47MPa and 14.03MPa respectively, which are both less than the limits of corresponding materials. The bridge is safe and reliable.

Structural Design and Artistic Expression of Landscape Multi-Span Arch Footbridge

In order to perfectly make the bridge function, structural style, architectural art modeling with the surrounding environment, this paper, based on the design of landscape five-span arch footbridge, studies the span arrangement, structural style, building materials, railing shape, ornament style and color, and lamplight illumination of the bridge considering the factors such as hydrology, geology, surrounding environment (e.g. buildings and park), traffic flow and entire urban planning. To reduce the stress of main arch and the horizontal thrust of substructure, the new structure of T-frame with sloped plate was put forward to bear the deck loads with the assistance of main plate arch. The thin concrete walls were cast on the top sides of the main plate arch, which were decorated by fine stone with the modern decoration construction technology. The white marble railings present lively morphology with carved lotus and pomegranate on the column cap, and many kinds of flowers on the panels. The spotlights make dramatic night sense for the bridge. Therefore, the landscape footbridge in the classical arch graceful shape was constructed by the modern building material and the optimized reinforced concrete structure, which presents the unity and coordination of structural design and artistic expression.

Static Analysis of Prestressed Concrete Cantilever Bridge

Due to geological conditions at abutment, working mechanism and economy, a prestressed concrete bridge with double cantilevers is designed. Main dimensions and drawings are introduced and static analytical results of prestressed concrete cantilever bridge are discussed. The numerical model was built by the integrated solution system for bridge and civil Engineering-MIDAS/Civil. The main loads which affect internal force and deflection at key sections of bridge are studied, such as mid-point, support point and free end of cantilever bridge. The rules which loads affect internal forces and deflections are revealed. The results show that dead weight is an important load to control internal force and deformation of bridge with double cantilevers. The design and numerical results would give some references to the optimization of similar bridges.

Design of Prestressed Concrete Continuous Rigid Frame Bridge with V-Shape Piers

This paper introduces the design of a prestressed concrete continuous rigid frame bridge with V-shape piers built in Shijiazhuang city, China. The model and structural shape of this bridge were stated considering the factors such as hydrology, environment, artistic display and construction technology. The V-shape piers in main elevations combining the changed sections and larger hanged roof of box-girder gave out the lively and attractive views of whole bridge. The design software MIDAS/Civil was applied to build the numerical model for analyzing the static properties of the bridge structure. The results show that the loading performances of the bridge meet the specifications of current Chinese design codes. The bridge has been constructed and operated since Jan. 2010, which is becoming a main linkage between city and outskirts, and a landscape of the Taiping River Park of the city.

Effect of Pile-Soil Action on Seismic Resistance of Prestressed Continuous Box-Girder Bridge with Changed Sections

Combined with the design of a bridge with prestressed concrete continuous box-girder, and in accordance with the Chinese guidelines of seismic design for highway bridge, the numerical models with and without considering the pile-soil action were built using Midas Civil software. The response spectrum method was used to analyze the seismic response of the bridge under E1 and E2 seismic actions. The vibration characteristics such as frequency, period and mode as well as the internal forces and displacements of piers are discussed in view of the effect of the pile-soil action.

Numerical Simulation of Bond Properties of Steel Bars in Concrete with Machine-Made Sand

Based on the experimental studies, finite element models were built using ANSYS software to simulate the bond properties of steel bars in machine-made-sand concrete (MSC), which considered the nonlinear bond behavior of interface between steel bar and MSC. The concrete strength and the bond length of steel bar are considered as the main parameters for calculation. The complete bond-slip curves of plain and deformed steel bars are well simulated comparing those obtained from the experimental studies. The study gives an theoretical method to analyze the bond properties of steel bar in MSC.

Static Analysis of Reinforced Concrete Arch-Deck Bridge with Archaized Connective Corridors

As the requirements of traffic functions and urban landscape, a reinforced concrete arch- deck bridge is designed with archaized connective corridors. The main dimensions and drawings are introduced and the static analytical results of the bridge are discussed in this paper. The numerical model was built by the integrated solution system for bridge and civil engineering- MIDAS/Civil. The results show that the temperature of bridge and the horizontal shift at arch toes due to sedimentation play important roles sensitively influencing the bending moments and displacements of control sections. Compared numerical results of the bridge only with dead loads, the maximum bending moments and displacements would reach 3.81 times and 6.52 times respectively. The axial force of arch is mainly resulted from dead loads, which gradually increases from arch crown to arch toes. The design and numerical results would give some references to similar bridges.

Effect of Side-Web Slope on Loading Properties of Prestressed Continuous Box-Girder Bridge with Changed Sections

Combined with the practical design of a prestressed concrete continuous box-girder bridge with changed sections, the effect of side-web slope on the loading properties of this bridge was analyzed. The numerical modes of this bridge were built using the specialist FEM software, 5 side-web slopes were considered by changing the width of box floor. The results show that the changes of side-web slope influence the mid-span deflection of box-girder in a small range under vehicle load, but affect obviously on the transversal loading properties such as crack width and flexural resistance of the box roof. Based on this, the suitable side-web slope is selected. It may be referenced by the similar design of this kind of bridges.

Genetic Analysis and Repair of Cracks in Prestressed Concrete Box Girders during Precast Period

During the initial period of precast prestressed concrete box girders in a bridge, some cracks appeared in five box girders. The paper describes the crack states including location, elongation, space, width and depth. The geneses of the cracks are analyzed considering the concrete proportion, environmental condition and construction procedure. Four of them were permitted to be used after mending of these cracks and another one was abandoned directly. After the preventing measurement was adopted, no cracks appeared in the follow-up precast box girders. The experience can be as reference for the similar construction works.

Judgement on Rough Set Theory for Disease Formation of Cement Concrete Pavement

An analytical method based on rough set theory is put forward to judge disease genesis of cement concrete pavement, in which a decision table of disease genesis based on rough set theory is built according to statistical data of pavement disease in special segment. The support degree of each factor is computed by the attribute reduction algorithm of rough set theory to estimate its influence on pavement disease. The feasibility of the method is illustrated by an example, which makes up the shortages of present practical methods of the pavement disease genetic analysis and provides scientific judgment for maintenance decision of pavement.