In practice, seismic intensity is evaluated in accordance with a macroseismic-intensity scale recognized the field of engineering globally. The application different seismic-intensity scales to evaluate damage specific structure due an earthquake yields diverse results. On this basis, study compared few extensively used scales. results can be as reference develop international scale. According empirical structural-damage survey data from Wenchuan (Mw = 8.0) that occurred on 12 May 2008...

Mechanical properties determine the use of two-component polyurethane materials. The compatibility two components in polyether polyol-MDI molecular system greatly influences formation mechanical In this paper, we studied and evaluated at multiple scales by combining dynamics simulation with macroscopic experiments, which is an important guideline for synthesizing preparing polyurethanes. We stability calculating solubility parameter, binding energy, diffusion coefficient four temperatures...

In order to understand the seismic performance and mechanism of bottom frame wall masonry structure (BFSWMS) its vulnerability in empirical damage, based on statistical numerical analysis field damage observation data 2178 Dujiangyan structures Wenchuan great earthquake urban China May 12, 2008, a non-linear function model between grade number samples is established, regression curve given. The matrices multiple intensity regions are functions each region curves exceeding probability...

Abstract To study the difference in seismic vulnerability of multiple typical structures intensity zones, damage 7099 buildings Dujiangyan masonry structure (MS), reinforced concrete (RC) and bottom frame wall (BFM) 2008 Wenchuan earthquake China is summarized analysed. First, a statistical analysis data carried out, empirical matrix model curves are established by considering number storeys, age fortification factors. The cumulative exceeding probability grade zones shown. mean index...

To widen the application scenarios of polyurethane concrete materials, a new type material for steel bridge deck pavement in seasonally frozen areas was developed, and it applied to engineering bridges with orthotropic slabs. In this paper, we studied properties through tests compressive strength, flexural tensile bond strength plates at different temperatures from −40 °C 60 °C, totaling 11 temperature levels. We analyzed elastic modulus, peak strain, stress–strain relationship curve...

Conventional asphalt bridge expansion joints used in low-temperature regions generally show cracking within the first 2years. To improve performance of these joints, commercial MEIJIA binder commonly joint construction was modified with two polymers: thermoplastic rubber and rubber. The goal is to find an optimum combination polymers, binders, aggregates regions. polymer binders mixtures were evaluated for their properties using ductility, penetration, indirect tension, bending tests. study...

In this study, ice force on bridge piers during collision was investigated. Field test performed the Huma River Bridge in northern China and laboratory specimens to measure compressive strength at various temperatures strain rates. Test data analyzed using Universal Global Optimization (UGO) technique. Relations for as functions of temperature rate were obtained. The distribution a floating sheet measured continuously three days Cu50 sensors. observed be nonlinear, with lowest middle...

Thermophysical properties of frozen soil have a great influence on the quality cast-in-place concrete piles.In this paper, embedded temperature monitoring system is used to test variation law during construction bored pile.Thermophysical permafrost around piles are tested.Based theory three-phase unsteady heat conduction soil, specific capacity, thermal conductivity, diffusivity, and latent phase transformation change pile systematically studied.The parameter obtained which exerts most...

The tensile debonding process of a polyurethane (PU)-asphalt concrete (AC) adhesion system under different temperature fields was simulated in this paper using LAMMPS molecular simulation software, and the interfacial energy, radial distribution function, mean square displacement, number density curve, force-displacement curve were calculated. When below 280 K, adsorption occurred between PU asphalt, asphalt silica, but energy silica larger than that silica. A large molecules exist range 5Å...

This article aims at analytically solving the free vibration problem of rectangular thin plates with one corner and its opposite two adjacent edges rotationally-restrained, which is difficult to handle by conventional semi-inverse approaches such as Levy solution Naiver solution, etc. Based on classical Fourier series theory, this work presents a first endeavor treat two-dimensional half-sinusoidal series, quite similar Navier’s form plate deflection. By utilizing orthogonality present trial...

Cement concrete, as an extensively used engineering material, is omnipresent in various infrastructure projects such bridges and roads. However, these structures often need to operate for extended periods under varying harsh environmental conditions, facing not only complex vehicular loads but also the effects of temperature differential cycling. Consequently, understanding how cycling impacts compressive fatigue life cement concrete has become a pivotal research topic. In this study,...

Purpose This study aims to address the degradation and damage of traditional bridge expansion joints by proposing a seamless joint device based on polyurethane elastomer (PUE). Design/methodology/approach A series laboratory experiments were conducted evaluate performance PUE, including elasticity recovery, interfacial bonding hygrothermal aging tests. Indoor model tests also designed analyze PUE's in actual structures. Based these evaluations, design PUE structure was completed. Findings...

Purpose The effects of fatigue load level and plate thickness on the performance reinforced concrete T-beam bridges. Design/methodology/approach Fatigue tests were performed based damage theory concrete, combined with finite element model analysis. other conditions are controlled separately, bridge carriageway slab under different levels thicknesses is studied. Findings process a divided into three stages: generation, development failure. Under certain conditions, as increases, accelerates;...

Abstract Based on the distress survey of existing reinforced retaining wall in Harbin, this article summarizes main forms distresses. Taking section with typical distresses as an example, influences fill properties, void, ribbon fracture, seepage, traffic load, and other factors horizontal deflection axial force were analyzed by finite element (FE) method. Causes systematically studied. Results showed that soil pressure, combined action many are causes The sensitivity displacement a cohesion...

In order to investigate the shear performance of PUC-steel plate interface with stud connections and obtain a arrangement scheme better synergy between studs PUC (Polyurethane concrete), this paper designed 9 different schemes using equivalent stiffness per linear meter. The failure morphology, load-slip curve, strain-slip curve were obtained through 27 sets push-out tests. tests revealed that ultimate bearing capacity is positively related meter single-row studs, whereas corresponding peak...

In order to study the residual bearing capacity of carriageway slab a reinforced concrete rib beam bridge after fatigue damage, double T-beam model with high degree symmetry was designed and tests were carried out. Based on cumulative damage theory, strength equation improved constitutive steel bar arbitrary loading times established. Because slabs are highly symmetrical, we used ratio length width height express dimensional changes in slabs. Abaqus general analysis program create...

This study was focused on the performance of pile force at lateral load an arched bridge. The effect compression arch bridges creates a large horizontal load. Therefore, it is one most important factors in dimensioning piles. aims to make comparative between results obtained field, and those by 3D model defined as Finite Element (FE) drilled pile, subjected different loads applied exact time intervals. Moreover, intended determine influence diameter using FE model. Thus, unified FEA software...

To research the seismic damage characteristics, mechanism and vulnerability of multi-storey reinforced concrete (RC) frame structures, statistics analysis, were made on 930 RC structures in Dujiangyan during Wenchuan earthquake, China. Firstly, structure is investigated comprehensively. According to investigation results, easily damaged locations this kind structural system are: infilled wall, column, beam-column, joints stairs. However, a large number are basically intact or slightly...

By using ANSYS/LS-DYNA explicit dynamical analysis software, finite element models for an ice sheet and a T-frame bridge were set up individually. On the basis of deformation compatibility condition momentum equation, impact force drift on pier was computed. The effects ice-breaking nose shapes investigated. parameters studied included angle wedge-shaped nose, inclination both bow-shaped noses, curvature nose. research results indicated that are important factors affecting force. study...

Purpose The fatigue problems of the carriageway slabs reinforced concrete rib-beam bridges were studied. analysis could not achieve actual stress state. Design/methodology/approach Based on this characteristic, T -beam group structure system was taken as research object. Four scale models ribbed designed. failure modes and resistance with different length-to-side ratios systematically studied through static load experiments. this, damage plasticity model (CDP model) combined numerical...

The purpose of this paper is to study the development law fatigue damage carriageway slab reinforced concrete ribbed girder bridge and provide theoretical support for design. test rib beam slabs was conducted. Based on material theory, model established by ABAQUS software. performance, failure mechanism, effect level performance were studied. experimental research results show that when fatigued, radial crack appeared at bottom slab, which belonged punching shear failure. process divided...

Abstract In this paper, we mainly studied the stress variation law of corrugated pipe culvert in permafrost regions under influence external load and temperature field, formulated corresponding experimental arrangement observation scheme, order to reveal mechanical characteristics action mechanism metal culverts.At same time, upper limit foundation culvert, established finite element model culverts, for which conducted analysis, frost heave solution(thawing) settlement analysis; measured...