Composite box girders with corrugated steel webs and trusses is a new type of advanced bridge structure proposed recently. This kind consists top concrete slab, two bottom concrete-filled tubes connected by trusses. The resistance to torsion overturning this larger than that composite bridges single tube. able satisfy the requirement rapid construction, environment protection cost effectiveness. Two girder have been or are being constructed in China. paper presents design these detail, which...

The composite box girder bridge with corrugated steel webs and trusses is a recently proposed enhanced structure. shear-lag effect of this kind structure studied in detail research. Two 8.744 m-long test beams without concrete filled the bottom tubes were constructed tested. non-uniform distribution cross-sectional stress top slab was captured. filling inside shown not to have great influence on effect. Numerical parametric studies carried out study various factors numerical results indicate...

The composite rigid-frame bridge presented in this study is a new type of structural solution that combines the steel–concrete box girder and concrete-filled double-skin steel tube (CFDST) piers with rigid connecting joints. Compared conventional prestressed concrete bridge, it shows superior static dynamic performances. This performs shake table tests 1:10-scaled three-span (SCCRFB) to explore its seismic characteristics damage modes. details model design, construction, measurements,...

The composite box girder with corrugated steel webs (CSWs) and trusses is a bridge structure developed on the basis of traditional girders CSWs. In this research, experimental, numerical analytical studies were carried out to investigate flexural performance simply supported Two 1:5 scale models real fabricated tested, including one concrete filled tubes another hollow tubes. test results show that two specimens have good ductility failed in ductile manner. inside reduces deflection...

The total organic carbon (TOC) content in lake sediments is an effective archive indicating past climate changes. However, the resolution of TOC record has generally been limited by factors such as subsampling intervals, hampering further comprehension change. Recently, hyperspectral imaging technology increasingly employed to scan sediment cores, presenting new opportunities reconstruct high-resolution sequences, but reconstruction long-term records using and implications have not well...

Abstract The solid-free viscoelastic surfactant (VES) fluid has good proppant transport and excellent cleanup capabilities. Coupling the benefits of a VES with carbon dioxide (CO2)-emulsified system will further enhance in depleted reservoir, extend application to water-sensitive formations, maintain reservoir gas saturation prevent any potential water blocks. This paper reports on new multisurfactant developed specifically provide robust surfactant-base fracturing supercritical CO2. field...

Abstract Simply-supported bridges are vulnerable to surface fault rupture as evidenced by several fault-crossing in the 1999 Chi-Chi earthquake. To investigate seismic collapse mechanism of simply-supported crossing fault, across-fault ground motions firstly simulated present study. In particular, based on a previously developed model earthquake, broadband at six using hybrid deterministic-stochastic method, which low- and high-frequency components computed deterministic Green’s function...

Prestressed concrete (PC) box girder is an innovative structure that widely used in large-span bridges. Under eccentric loads such as vehicles, PC girders are inevitably under combined bending and torsion. To study its bending-torsional behavior, a refined full-range analysis model based on the action softening truss (CA-STM) was proposed, where simple effective solution procedure failure criteria were provided. The equilibrium equation, initial estimation equation for torque, material...

The poor thermal stability of polyolefin separator greatly limits the output performance and safety a lithium ion battery at high temperature. Herein, we report novel silicone grafted prepared by simple solution process its performance. Despite low coating thickness, significantly improved separator. In addition, shows enhanced electrolyte affinity. Due to these favorable features, exhibits temperature 80 °C. Our results suggest that could be potentially used in practical applications.

Abstract The extent of crosslinking a polymeric fracturing gel can significantly contribute to the success or failure hydraulic treatment. In certain cases, excessive while fluid is in tubulars result friction pressures that are too high, and may prohibit treatment from achieving design goals. With titanium (Ti) zirconium (Zr) crosslinked gels, which known be prone irreversible shear degradation, early substantially reduce final strength, even degree near wellbore proppant transport...

A new type of composite structure, the box girder with corrugated steel webs (CSWs) and trusses, is proposed recently. In order to investigate structural behavior under positive negative bending moments, flexural tests continuous were carried out, failure modes, deformation patterns, strain distribution, development concrete cracks investigated. Finite element analysis was conducted effect range in tube thickness CSWs on behavior. The experimental numerical results show that test beam has a...

Bridge cable is an important part of the cable-stayed bridge, and reliable methods are necessary to ensure its safety. This paper proposes algorithm which realizes real-time monitoring health bridge by b-value analysis acoustic emission technique. The can eliminate impulse noise continuous noise. Discrete wavelet transform decomposes AE signal, then coefficients processed. By comparing with predefined threshold, method monitor cable. And this realize monitoring.

The EM algorithm is a very popular maximum likelihood estimation method, the iterative for solving estimator when observation data incomplete data, but also effective to estimate finite mixture model parameters. However, can not guarantee find global optimal solution, and often easy fall into local so it sensitive determination of initial value iteration. Traditional select at random, we propose an improved method selection value. First, use k-nearest-neighbor delete outliers. Second,...

Effects of AlO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">x</sub> interfacial layer in the W/AlO /TaO /TiN structures have been investigated for first time. This RRAM device shows long endurance 10 <sup xmlns:xlink="http://www.w3.org/1999/xlink">6</sup> cycles and good retention at 85°C a low current compliance 100 μA. A physics based simulation is studied to understand set reset mechanism RRAM. The nature ions migration, potential profile...

This paper proposes an innovative method to calculate the normal stress of concrete slabs near intermediate support for composite girder bridges with corrugated steel webs (CSWs). The shear stiffness CSWs is lower than that webs, which will lead significant deformation. For girders supports, deformation be constrained by crossbeam, resulting in additional stresses top and bottom slabs. effect not considered most design codes, unsafe designs. Therefore, analytical solutions under different...

For the problem of high water cut oil producing well, technology that oil-water is separated and injected to down hole can reduce cost price. The down-hole separation system composed double fluid flow pump, hydrocyclone lift pump. This runs well on site. Experimental study finds which has cylinder-cone-inverted cone overflow pipe short-circuit flow, average efficiency reach 98.1%, reduction rate 0.51% in intermittent it decreases slowly with ratio split divided by content increasing.

High-speed gears are crucial transmission components found in airplanes and other systems, they maintained primarily through oil injection. However, due to their high operating speeds the influence of injection settings, gear surface lubrication efficacy is frequently insufficient, compromising system’s precision, durability, safety. Currently, parameter choices for high-speed mostly rely on empirical judgment, which results significant time resource expenses. This study focuses one pair...

With increasing of the development smart grid and restructuring power industry, efficient operation schedule for a time-of-use (TOU) rate industrial user may become more important problem in cities. This paper develops stochastic direct search method (SDSM) to solve operating TOU user. To effectively overcome coupling constraints problem, three-state dynamic programming (DP) is also incorporated into SDSM augment procedure. A customer Taiwan Power Company (TPC) used as an example validate...