Abstract A novel structural wall pipe, PVC axial hollow‐wall pipe (AHWP) has been developed to reduce carbon emissions during the “Full Life Cycle” of pipelines by reducing material use in walls. The advantages and application prospects AHWP are examined, followed manufacturing prototypes using advanced production techniques. properties, internal external pressure resistance, impact buried load deformation three types were evaluated. Experimental numerical simulations analyzed how...

Abstract In this work, the bonding properties of steel pipes and concrete enhanced by internally welded bars are investigated, a method to prevent debonding is proposed. A series experiments ultrasonic tests revealed that internal welding effectively improved bond strength interface between pipe concrete. Q420qD C60 self-compacting compensating were used in experiment, filling was uniformly ensured pumping vacuum-assisted perfusion. The experimental results show concrete-filled tube...

In this study, a tubular spot-welded grating sensor composed of stainless-steel tube fixed to substrate surface by welding is developed, and the filled with high-performance epoxy resin components after passed through it. A smart steel strand cable created spot strands using portable spot-welding equipment. This method generates small current during welding, voltage only 3 V 5 V, does not damage internal structure strand. An equation related temperature, tension force, wavelength fluctuation...

<title>Abstract</title> Bridge damage induces immediate stiffness reductions in bridge structures, manifested as variations static parameters such strain and deflection, which pose significant safety risks. This paper presents a rapid diagnosis method for T-beam bridges using influence lines. The derives the analytical line formula examines its variation under transverse longitudinal conditions. By analyzing peak values envelope area shifts line, diagnostic difference curve is generated,...

This study investigates and assesses the bond performance between steel reinforcement recycled concrete, subject to confining effect of transverse stirrups post high-temperature exposure. A series 24 specimen groups was examined, with variations in parameters including stirrup ratios (0 %, 0.24 0.67 1.34 %), concrete aggregate (RCA) replacement 50 100 temperatures (300 °C, 500 700 °C). Central pull tests were administered discern impact each parameter on integrity steel-reinforced concrete....

Large-diameter concrete-filled steel tube (CFST) members are being increasingly utilised owing to their ability carry larger loads and resist bending. Upon incorporating ultra-high-performance concrete (UHPC) into tubes, the resulting composite structures lighter in weight much stronger than conventional CFSTs. The interfacial bond between UHPC is crucial for two materials effectively work together. This study aimed investigate bond-slip performance of large-diameter columns effect...

In order to control the tower deviation in cable hoisting process of long-span concrete-filled steel tubular arch bridge during construction monitoring, a practical method correction was studied and established. paper, based on studies about error formation mechanism lifting, relevant formulas rib elevation changes caused by change state were deduced. The traditional methods including increase stiffness strength anchor cable, are not effective, costly, require longer period. To overcome...

Six concrete beam-column frame sub-assemblages reinforced with basalt fiber-reinforced polymer (BFRP) bars in the beams were designed to investigate collapse resistance after a middle column removal. Effect of parameters, including span depth ratio beams, prestressing, as well material types stirrups on sub-assemblages, was investigated. Experimental results showed that initial stiffness apparently lower due low elastic modulus BFRP bars. The presented wave-like increasing tendency vertical...

Seawater splashing and frequent rainfall in the coastal area will often cause concrete members to be affected by dry-wet cycles. In order investigate effect of salt solution on mechanical behaviours geopolymer under cycles, a series tests erosion three different solutions were carried out using mass loss rate, compressive strength, resistance coefficient, elastic modulus. The results show that, with increase specimen increases slightly at 20 cycles then decreases gradually. Then,...

It is still a practical problem how to effectively install FBG sensors on bridge cabes. In this paper, simple and effective solution introduced develop smart cables using FRP-OFBG bars developed in HIT (Harbin Institute of Technology). Here, the bar acts as one component cable shows force resistance well-protected service. The installation techniques sensing properties FBGs three kinds cables, FRP common steel-wire extruded-anchor cable, are tested under dead load. Moreover, preliminary...

Zangmu Bridge is a concrete-filled steel tube (CFST) arch bridge along the Sichuan-Tibet railway in Tibet, with main span of 430 m. Owing to unique temperature conditions there have been no large-scale experimental studies on thermal load design CFST bridges this area. Therefore, determine calculation parameters and effects Bridge, long-term continuous field test was conducted measure variations same pipe diameter. The results were then compared current specifications relevant literature....

To study the effect of temperature field and gradient a steel‐concrete composite box girder bridge, 5 × 35 continuous bridge is used as research object. The measuring point set by selecting typical cross section, change data are measured. different positions in studied, global local differences compared, law distribution main factors affecting formulated. most unfavourable expression function vertical section simulated using measured data, existing standard mode finite element model...

The purpose of this study is to investigate the performance changes in steel-stranded hangers under complicated loads moist or corrosive environments. First all, corrosion tests were carried over three time periods (360 h, 720 1080 h) on glossy and galvanized steel strands different levels obtained. Subsequently, tensile out with degrees (including no corrosion) at deflection angles. test results showed that ultimate bearing capacity uncorroded strand angle decreased by 21.8%, while longest...

Hangers are important tensile members in half-through arch bridges and through (HTABs TABs). The floating deck structures of HTABs TABs will commonly produce longitudinal deformation rotate under the effect temperature gradient, which cause bending at anchorages fixed-end hangers. This can generate adverse stress for hangers decrease strength fatigue properties seven-wire strands Firstly, theoretical derivation finite element analysis conducted to study that is caused by deformation. We find...

The influence of various seismic parameters on the performance rectangular reinforced recycled concrete columns was comprehensively revealed through collecting and screening experimental data from 53 aggregate columns. research results showed that bearing capacity specimens decreased ductility increased, which were attributed to following factors. a. increase in replacement ratio slenderness coarse aggregate, b. reduction axial compression strength concrete. design limitations boundary...

In view of the limitations existing optimization method suspender cable force, in order to improve stress under completion state and avoid frequent adjustment force grid beam elevation during construction, a new is proposed. The article takes longest large span arch bridge world, Pingnan Third Bridge, Concrete-filled steel tube (CFST) with 575m as engineering background combined finite element analysis multi-objective method. One that “Real-time correction process variable optimal results...

A novel type of traditional composite member-unbonded prestressed I-shaped steel encased in a UHPC (PSRUHPC) beam is proposed to reduce the brittleness beams and improve their bearing capacity. PSRUHPC beam, an unbonded (PRUHPC) I-shape (SRUHPC) were manufactured, flexural static performances assessed using comparison test. The test results reveal that process similar ordinary reinforced concrete beams, crushing compression zone sign failure. Due bridge coupling effect fiber, crushed still...

To study the construction of concrete‐filled steel tubular (CFST) arch bridges in Tibet, China, hydration‐temperature field nonshrinkage concrete large‐diameter CFST ribs was evaluated a temperature‐testing box to simulate low‐temperature environment. A finite element simulation then conducted replicate experimental results. Finally, an improved formula with parameters related diameter, position, and retarding time for predicting hydration heat generated by non‐shrinkage cured at low...

Firstly, Wavelength shift of Fiber Bragg Grating (FBG) sensors that monitor the arch bridge suspender tension due to strain or temperature change has been studied theoretically, and theirs sensitivity coefficient is gotten through calibrating experiment. Secondly, FBG have successfully installed in some key suspenders Sichuan Ebian Dadu river bridge. Techniques installation repairing explored in-service Thirdly, temperature, effect same loading different length monitored with sensors. The...